BazTech - Yadda

1

Bearing Capacity Evaluation of Shallow Foundations on Stabilized Layered Soil using ABAQUS

Bhardwaj Avinash, Sharma Ravi Kumar

Studia Geotechnica et Mechanica

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2023

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Vol. 45, nr 1

55--71

EN

In this paper, the finite element method (FEM) is applied to calculate the bearing capacity of two footings having the aspect ratio L/B (where L and B are the length and width of the footing, respectively) equal to 1, 2 resting on one-layer and two-layer soil. Soil profile contains two soil types including sand and clay. The soil strip is 500mm × 500mm × 350mm; however, only a quarter of the model (250mm × 250mm × 350mm) is examined in the study. Two primary situations are investigated in this study. In the first situation, the one-layer system is supposed to be sandy soil with footing overlays on medium-dense sand. The soft clay/stabilized clayey layer is supposed to be on top of the sandy soil in the second condition, with the footing resting on top of the soft clay/stabilized clay. The influence of layer thickness, aspect ratio, and material property on the bearing capacity value and footing failure mechanism is studied for eight different combinations of layered soil. The bearing capacity for a one-layer case is also estimated, and it agrees well with Vesic (1973), Hansen (1970), and Terzaghi's (1943) equations. The bearing capacity of footings is observed to decline when the height of unstabilized clayey soil increases, and it increases when clayey soil is stabilized with molasses, waste foundry sand, and lime alone and in combination with each other.

2

Health monitoring of the Veresk Bridge by comparing the results of precision instrument measurements and modelling with Abaqus software and wavelet function

Kivani Mahtisa, Keyhani Ali

Roads and Bridges - Drogi i Mosty

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2023

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Vol. 22, no. 2

181--199

EN

Identification and classification of structural failures is a vital aspect of bridge maintenance. When local structural damage is identified without delay, its repair is less expensive and problematic than in the case of general damage. To determine seismic vulnerability or post-seismic damage, structural health assessments are frequently performed on bridges, dams, and buildings. The aim of this study is to keep track of the overall health of the Veresk Railway Bridge, which has been in service for over 90 years. For this purpose, the structure was modeled in the ABAQUS finite element software. Mode shapes of the structure were then extracted, the positions were determined as maximum points using MATLAB software, and a wavelet function was applied to these shapes. The results showed that the wavelet function is highly accurate and its results are close to the real values measured for the bridge.

PL

Identyfikacja i klasyfikacja uszkodzeń konstrukcji nośnej stanowi niezwykle ważny aspekt utrzymania mostów. Odpowiednio szybkie rozpoznanie lokalnych uszkodzeń pozwala na ograniczenie kosztów i problemów związanych z ich naprawą w porównaniu do konieczności remontu całej konstrukcji. Aby określić podatność obiektów na oddziaływania sejsmiczne lub zbadać związane z nimi uszkodzenia często przeprowadza się ocenę stanu technicznego mostów, zapór i budynków. Celem niniejszej pracy jest zbadanie uszkodzeń i ogólnego stanu technicznego mostu kolejowego w Veresk, który jest eksploatowany od ponad 90 lat. W tym celu wykonano model mostu w oprogramowaniu ABAQUS przeznaczonym do analizy metodą elementów skończonych. Uzyskano postacie drgań własnych konstrukcji – pozycje określono jako punkty maksymalne w programie MATLAB – po czym zastosowano do nich transformację falkową. Wyniki analizy wykazały, że transformacja falkowa jest bardzo dokładna, a uzyskane wartości są zbliżone do rzeczywistych wyników pomiarów wykonanych na moście.

3

Performance of Solid Waste Landfills Under Earthquake-Induced Vibrations

Seyedi Marghaki Behnaz, Soltani Fazlollah, Noroozinejad Farsangi Ehsan, Sivandi-Pour Abbas

Civil and Environmental Engineering Reports

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2022

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Vol. 32, no. 2

1--22

EN

The stability inside the waste, internal stability, and co-stability between the elements of the insulation system and the landfill bed should be considered in the landfill design. The stresses and the resulting deformations in both mineral and geosynthetic materials of the insulation system must be controlled in the design, so that an unpredictable flow path is not created. Besides, long-term durability in the insulation system should be considered. An evaluation of the durability of the system requires knowledge of the interaction between the components and the waste as a settling object. The numerical modeling methods can be used to evaluate the local instability. In this study, a landfill constructed in the UK has been modeled in ABAQUS finite element platform and was verified with the results of obtained data from precision instruments at the landfill site. Then, by applying the earthquake excitations, the seismic behavior of the solid waste landfill under Far-Field and Near-Field earthquakes and their effect on the durability of the landfill wall system were investigated. The outputs include maximum displacement, maximum stress, the most critical state, and investigation of yield stress and rupture of the geomembrane layer. The results indicated that in the landfill wall, the maximum displacement occurs in the waste section. It occurs especially between the boundary of natural soil and waste. It was also observed that the geomembrane layer under the earthquake loadings had experienced some ruptures.

4

Numerical Investigation of Square Footing Positioned on Geocell Reinforced Sand by using ABAQUS Software

Juneja Gaurav, Sharma Ravi Kumar

Civil and Environmental Engineering Reports

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2022

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Vol. 32, no. 2

154--173

EN

The usage of geocell reinforcement for foundations supported on weak soil has been increased these days. The purposed study uses FEM-based ABAQUS software to analyse the behaviour of square footing supported on geocell reinforced sands subjected to static vertical loading. Numerical analysis was performed to find the optimum combination of the different geometric parameters of the geocell reinforcement. Three distinct types of sands were employed in the study with relative densities of 30%, 50%, and 70%. The geometric parameters of the geocell, such as the placement depth of geocell (u), the width (b), and the height (h) of the geocell, were modified in relation to the footing width (B) to access the optimum combination ratios. The inclusion of the geocell reinforcement increases the load-carrying capacity up to 5-6 times compared to unreinforced sand. The results obtained from the numerical analysis were intended to correlate well with the experimental data available in the literature.

5

Fire resistance of FRP strengthening concrete beams at elevated temperature using ABAQUS

Keong Ng Chee, Kadir Mariyana Aida Ab, Zuhan Nurizaty, Mastor Muhammad Najmi Mohamad Ali, Alel Mohd Nur Asmawisham

Archives of Civil Engineering

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2022

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Vol. 68, nr 2

105--123

EN

Mechanical properties of FRP such as strength and stiffness as well as the bonding interface between FRP and concrete will be badly deteriorated when exposed to high temperature. Furthermore, the effect of thickness of insulation with different type of concrete strength has not yet been studied elsewhere in numerical studies. Therefore, this study is to assess the thermal-structural behaviour of insulated FRP strengthened RC beam exposed to elevated temperature using ABAQUS. The proposed numerical model of 200×300 mm RC beam subjected to 2 hours standard fire curve (ISO 834) had been validated with the analytical solution. The validated numerical model then is used in parametric study to investigate the behaviour of fire damaged normal strength concrete (40 MPa) and high strength concrete (60 MPa) of RC beam strengthened with CFRP using various fire insulation thickness of 12.5 mm, 25 mm and 40 mm, respectively. The result of steel characteristic strength reduction factor is compared with analytical using 500°C Isotherm methods. The parametric studies indicated that the fire insulation layer is essential to provide fire protection to the CFRP strengthened RC beams when exposed to elevated temperature. The insulation layer thickness of 25 mm had been found to be the optimum thickness to be used as it is able to meet the criteria of temperature distribution and displacement requirement. In conclusion, the numerical model developed using ABAQUS in this study is to carry out assessment on the thermal-structural behaviour of the insulated CFRP-strengthened RC beams at elevated temperature.

6

Modeling of the axial crumpling of conical shells

Kiter Riyah N., Abbood Mazin Y., Hassoon Omar H.

Archive of Mechanical Engineering

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2022

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LXIX, nr 4

615--628

EN

The axial crumpling of frusta in the axisymmetric "concertina" mode is examined. A new theoretical model is developed in which the inward folding in both cylinders and frusta is addressed. The results were compared with previous relevant models as well as experimental findings. The flexibility of the model was substantiated by its capability of describing and estimating the inward folding in frusta in general as well as in cylinders as a special case. A declining trend of the eccentricity dependence with the D/t ratio was found in contrast with a previous theory which suggests total independency. ABAQUS 14-2 finite element software was employed to simulate the thin tube as a 3-D thin shell part. Numerical simulations of the process were found to, firstly, underestimate the theoretical values of inward folding in general, secondly anticipate more underestimations as the tubes become thinner and/or have larger apex angle, and finally anticipate as low as 300 apical angle frusta to revert its mode of deformation to global inversion.

7

Guidelines for FEM modelling of wood-CFRP beams using ABAQUS

Kawecki Bartosz

Archives of Civil Engineering

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2021

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Vol. 67, nr 4

175--191

EN

The article presents detailed guidelines for the nonlinear modelling of wood-CFRP beams with full cross-section using the Finite Element Method (FEM). Reviewing the literature has shown that behaviour of such composites is a current research topic, undertaken by many scientists. Complex numerical models made in the Simulia ABAQUS software are the basis for modelling recommendations. Properties of the materials consider the orthotropy and plasticity of wood and CFRP tapes, and the stiffness of adhesive layers with delamination. Results of laboratory experiments, got for a statistically significant number of specimens, confirm the model assumptions. This research paper provides a rich source of knowledge and experiences for scientists and engineers, who deal with mechanics of wood-CFRP composites. The uniqueness of the presentation lies in the detailed description of the complex numerical model. Specification comprises the steps necessary to do complete and successful calculations. The model is suitable for analysing the behaviour of wood-CFRP composites in different reinforcement configurations.

PL

Artykuł przedstawia szczegółowe wytyczne do nieliniowego modelowania belek o pełnym przekroju wykonanych z kompozytu drewno-CFRP z wykorzystaniem Metody Elementów Skończonych (MES). Przegląd literatury pokazał, że zachowanie takich kompozytów jest aktualnym tematem badawczym, podejmowanym przez wielu naukowców. Podstawą zaproponowanych rekomendacji są złożone modele numeryczne wykonane w programie Simulia ABAQUS. Parametry materiałowe uwzględniają ortotropię plastyczność drewna i taśm CFRP, jak również sztywność warstw klejowych i możliwość ich delaminacji. Założenia modelu zostały potwierdzone badaniami laboratoryjnymi przeprowadzonymi na ważnej statystycznie liczbie próbek. Powyższe opracowanie zapewnia bogate źródło wiedzy i doświadczeń dla inżynierów i naukowców zajmujących się mechaniką kompozytów drewno-CFRP. Unikalność artykułu polega na dokładnym opisie złożonego modelu numerycznego, który przedstawia kroki niezbędne do wykonania kompletnych obliczeń.

8

Flexural and shear behavior of reinforced concrete beams strengthened with carbon textile reinforced concrete

Nguyen H. C., Ngo D. Q.

Archives of Civil Engineering

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2020

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Vol. 66, nr 3

407--426

EN

Recently, textile reinforced concrete (TRC) has been intensively studied for strengthening reinforced concrete (RC) and masonry structures. This study is to experimentally explore the effectiveness of application of carbon TRC to strengthen RC beam in flexure and shear. Concerning the cracks formation, failure modes, ultimate strength and overall stiffness, the performance of the strengthened beams compared to the control beams were evaluated from two groups of tests. The test results confirm that the TRC layers significantly enhance both shear and flexural capacity of RC beams in cracking, yielding and ultimate loads. All of the tested specimens were also modelled using ABAQUS/CAE software, in order to validate the experimental results. The numerical results show that the simulation models have good adaptability and high accuracy.

9

Role of dilatancy angle in plasticity-based models of concrete

Wosatko Adam, Winnicki Andrzej, Polak Maria Anna, Pamin Jerzy

Archives of Civil and Mechanical Engineering

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2019

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Vol. 19, no. 4

1268--1283

EN

The so-called concrete damaged plasticity (CDP) model is frequently employed by ABAQUS users to simulate the behaviour of concrete. One important aspect of the model, namely the representation of material dilatancy, is evaluated in the paper. The role of the dilatancy angle in pressure-dependent plasticity models is reviewed. The plastic potential adopted in the CDP model is discussed. It is shown that the definitions of the angle in the CDP model and in the Burzynski–Drucker–Prager (BDP) plasticity model for a continuum can lead to different angle magnitudes. Two tests on concrete configurations are simulated to illustrate how strongly the angle influences the results: the Kupfer benchmark of a panel under uniaxial or biaxial compression and the punching shear response in a slab-column connection. The importance of viscosity in cracking simulation is thereby mentioned, the results are compared with experimental ones and mesh sensitivity is verified. Recommendations for analysis of concrete mechanics problems are formulated.

10

Evaluation of the Damage Initiation of a Composite Thin-Walled Structure, on the Example of the ADUSTER Gyroplane Undercarriage

Szklarek Karol, Różyło Patryk

Advances in Science and Technology. Research Journal

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2018

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Vol. 12, no 4

48--55

EN

The subject of the research was a undercarriage leg of a gyroplane made of composite materials. The aim of the work was to assess the level of damage initiation of the composite gyroplane undercarriage. In the study, a structural capacity analysis was carried out, taking into account the phenomenon of damage initiation. Numerical calculations were conducted based on the finite element method in the ABAQUS® software. The issue was solved according to the Newton-Raphson algorithm.

11

Wykonanie otworów w ceglanych sklepieniach walcowych

Orłowicz R., Nowak R.

Przegląd Budowlany

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2017

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R. 88, nr 12

30--31

PL

Zaprezentowano wybrane zagadnienia wykonania otworów w sklepieniach ceglanych dla przewodów inżynierii sanitarnej. Sklepienie zostało przebadane za pomocą symulacji MES w celu określenia jego stanu naprężeń. Został określony optymalny, czyli najmniej inwazyjny sposób kreowania otworów w sklepieniu. Otwór powinien przecinać sklepienie równolegle do trajektorii głównych naprężeń ściskających, minimalizując kierunek poprzeczny do tych linii.

EN

The article presents selected hole drilling concepts in case of barrel vaults for sanitary engineering. The vault was tested using the finite element method (FEM simulation) to determine its stress state. We determined optimal, the least invasive way of creating holes in the vault. The opening should intersect the vault parallel to the trajectory of the major compressive stresses, minimizing the transverse direction to these lines.

12

Numerical analysis of design of fiber composite materials with polymer matrix

Chatys R., Piernik K.

Composites Theory and Practice

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2017

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R. 17, nr 4

189--193

EN

Verification of the correct modeling of the flat state (on the example of a sample) was carried out using ABAQUS finite element analysis, by entering in the program, the mean values of samples cut at different angles to the reinforcement (mato E-glass fabric). Then, from the same material a tubular element subjected to special loads, made possible thanks to a rigid element (in the form of rods) so-called Rigid Links, was modeled.

PL

Weryfikację poprawnego zamodelowania stanu płaskiego (na przykładzie próbki) przeprowadzono metodą analizy elementów skończonych ABAQUS, wprowadzając do programu średnie wartości z próbek ciętych pod różnymi kątami względem wzmocnienia (mato tkanina szklana typu E). Następnie z tego samego materiału został zamodelowany element rurowy poddany obciążeniom specjalnym możliwym dzięki sztywnemu elementowi (w postaci prętów), tzw. Rigid Links.

13

Damage analysis of tensioning cable anchorage zone of a bridge superstructure, using CDP ABAQUS material model

Chróścielewski J., Miśkiewicz M., Pyrzowski Ł., Sobczyk B.

Archives of Civil Engineering

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2017

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Vol. 63, nr 3

3--18

EN

Numerical analysis of the tensioning cables anchorage zone of a bridge superstructure is presented in this paper. It aims to identify why severe concrete cracking occurs during the tensioning process in the vicinity of anchor heads. In order to simulate the tensioning, among others, a so-called local numerical model of a section of the bridge superstructure was created in the Abaqus Finite Element Method (FEM) environment. The model contains all the important elements of the analyzed section of the concrete bridge superstructure, namely concrete, reinforcement and the anchoring system. FEM analyses are performed with the inclusion of both material and geometric nonlinearities. Concrete Damage Plasticity (CDP) constitutive relation from Abaqus is used to describe nonlinear concrete behaviour, which enables analysis of concrete damage and crack propagation. These numerical FEM results are then compared with actual crack patterns, which have been spotted and inventoried at the bridge construction site.

PL

W trakcie prac budowlanych związanych z wykonaniem centrycznego sprężenia podłużnego przęseł mostu doszło do silnych zarysowań betonu bloków kotwiących. Pojawiły się znaczne rysy/pęknięcia poziome w strefie zakotwień na wysokości zbrojenia siatkami. W referacie podjęto próbę opisu mechanizmu zniszczenia strefy zakotwień kabli wewnętrznych sprężenia podłużnego jednego z przęseł mostu z wykorzystaniem środowiska metody elementów skończonych (MES) systemu ABAQUS. Wykonano symulację numeryczną niepożądanych zjawisk lokalnych zarysowania w blokach kotwiących kable, które wystąpiło w trakcie procesu sprężania konstrukcji. Miało to na celu ustalenie, od strony mechaniki, przyczyn ich powstania, w kontekście zaprojektowanego i wykonstruowanego układu zbrojenia.

14

Construction and Technological Analysis of the Broach Blade Shape using the Finite Element Method

Bławucki S., Zaleski K.

Applied Computer Science

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2017

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Vol. 13, no 1

41--50

EN

The paper presents results of numerical FEM analyses of the process of broaching the groove using the Explicit module of the ABAQUS program. The impact of the blade geometry was presented and of the selected technological parameters of processing when cutting the aluminium EN-AW 6061-T6 alloy on the load of the broach blade during its operation. This article shows influence of value of rake and clearance angle onto deformations of the tool’s cutting edge in the transverse direction. An interaction between broach blade shape and reduced stress in the area of cutting edge was presented. The optimum geometry of the cutting tool was proposed.

15

Analiza porównawcza wytrzymałości wybranych połączeń prowadnicowych, stosowanych w budowie maszyn

Bławucki S., Zaleski K.

Technologia i Automatyzacja Montażu

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2016

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nr 2

11--15

PL

Wykonywanie połączeń kształtowych wiąże się z trudnościami technologicznymi, stąd potrzeba poszukiwania nowych, prostszych do wykonania konturów. W pracy dokonano oceny porównawczej trudności wykonania i montażu połączeń kształtowych o zarysie trapezowym i teowym oraz zaproponowano nowe kształty połączeń konstrukcyjnych. Przeprowadzono obliczenia numeryczne wytrzymałości statycznej połączeń w stanie zmontowanym, z wykorzystaniem metody elementów skończonych w programie ABAQUS.

EN

The performance of shaped joints is associated with many technological problems, hence the need to seek out new, simpler to perform, contours. This paper contains an comparative assessment of difficulties of performance and mounting of trapezoidal and T-slot shaped joints and new outlines of joints were proposed. There were also done the numerical computations of the static strength in ready-assembled joints with the use of finite element method in ABAQUS program.

16

Modelowanie odkształceń mikronierownosci powierzchni wskutek uderzenia kulką

Bławucki S., Zaleski K.

Przegląd Mechaniczny

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2016

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nr 9

30--33

PL

W pracy przedstawiono wyniki symulacji numerycznej oraz badań doświadczalnych! procesu konstytuowania miejscowych odkształceń sprężysto-plastycznych. Próby wykonano na elementach ze stopu aluminium EN AW-5060 T5 o zmiennych wartościach parametrów chropowatości powierzchni. Doświadczenie wykonano na stanowisku do zadawania odkształceń plastycznych i pomiaru czasu styku. Dla wybranego przypadku przeprowadzono obliczenia analityczne głębokości powstałego odcisku. Przeprowadzono symulację numeryczną uderzenia kulki w powierzchnię próbki metodą elementów skończonych w programie ABAQUS. Użyto modułu Explicit. Zauważono, że wraz ze zwiększeniem chropowatości powierzchni, wzrasta również głębokość odcisku po uderzeniu pojedynczą kulką.

EN

The paper presents results of numerical simulation and experimental investigation of exerting local elastic-plastic deformation on surface. Tests were performed on the structures of the EN AW 6060 T6 aluminium alloy -with variable surface roughness. Experiment was conducted on stand designed for exerting elastic-plastic deformation and measuring time of contact. It were carried out analytical calculations of indentation depth for selected case of study Also numerical simulation was carried out ta king the finite element method on ABAQUS program. Explicit module was used. It were noticed, that increase of surface roughness causes rising of depth of indentation after single ball impact.

17

Ocena podatności struktur cienkościennych na lokalne odkształcenia plastyczne metodą pomiaru czasu styku

Bławucki S., Zaleski K.

Mechanik

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2016

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R. 89, nr 11

1602--1603

PL

Opisano dotychczas stosowane rozwiązania w zakresie pomiaru odkształcenia i naprężenia w warstwie wierzchniej elementów umacnianych poprzez zgniot. Przedstawiono nowy, zgłoszony do opatentowania, sposób pomiaru podatności metalowych struktur cienkościennych na miejscowe, powierzchniowe odkształcenie plastyczne. Polega on na porównaniu czasu styku elementu nagniatającego z obrabianym przedmiotem cienkościennym oraz przedmiotem o dużej sztywności. Eksperyment zweryfikowano metodą elementów skończonych.

EN

This paper describes existing solutions for measuring deformations and stress in the surface layer of strain-hardened parts. It also presents a new, patent pending method of measuring susceptibility of metal thin-walled structures to a local, plastic deformation on their surface. This method compares the time of contact of an impacting element with the thin- -walled workpiece and a high-rigidity object. The experiment was verified using the Finite Element Method.

18

Modeling and Simulation Baed Analysis of Centrifugal Pump Volute Design Parameters by Finite Element Method

Belbachir S., Allali A., Lousdad A., Benguediab M.

Mechanics and Mechanical Engineering

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2016

|

Vol. 20, nr 4

417--424

EN

The performance of pumps are influenced by many factors among which the geometric configuration of the volute. The role of the volute in a centrifugal pump is the transformation of the kinetic energy into pressure with a minimum of losses. The volute is a pump element which is difficult to modify. It must be able to be adapted to impeller with different dimensions. The objective of this work is to investigate by numerical simulation the Von Mises stress distribution and displacements in volutes of different dimension in diameters and width of a centrifugal pump. The study is carried out using finite element method on a three dimensional configuration using ABAQUS code. Only a few attempts of numerical analyses of the mechanical behavior of volute are made. This element plays an important role in the pump adaptation for a given operating conditions by adjusting its dimensions. This activity is conditioned by a good understanding of 418 Belbachir, S., Allali, A., Lousdad, A. E. and Benguediab, M. the design process of the volutes. The obtained results show the modifications of the diameter and the width of the volute have an effect on the values of Von Mises’ stresses and on the displacements. The stresses and displacements reach their maximum with increasing diameters and are inversely for the increase in the width. These dimensional modifications can act indirectly on the clearance at the bec and also on the clearance between the volute exit and the impeller. These are functional clearances which allow the determination of the operating characteristics of centrifugal pumps. With these results substantial improvement on the pump design can be made.

19

Renovation and strengthening of wooden beams with CFRP bands including the rheological effects

Kula K., Socha T.

Civil and Environmental Engineering Reports

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2016

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No. 22(3)

93--102

EN

The paper presents a work analysis of wooden beams reinforced with glued composite bands from the top and resin inclusions, taking into account the rheology of materials. The paper presents numerical model of the multimaterial beam work including rheological phenomena described by linear equations of viscoelasticity. For the construction of this model one used MES SIMULIA ABAQUS environment in which were prepared its own procedures containing rheological models. The calculation results were compared with the literature data. One has done an analysis of the advisability of the use of CFRP reinforcements bands in terms of rheological phenomena.

PL

W referacie zaprezentowano analizę pracy drewnianych belek wzmocnionych wklejonymi od góry taśmami kompozytowymi i inkluzjami żywicznymi z uwzględnieniem reologii materiałów. Przedstawiono model numeryczny pracy belki wielomateriałowej obejmujący zjawiska reologiczne opisane równaniami liniowej lepkosprężystości. Zaproponowano pięcioparametrowy model reologiczny opisujacy zachowanie drewna i kleju. Do budowy modelu numerycznego wykorzystano środowisko MES SIMULIA ABAQUS, w którym przygotowano własne procedury zawierające model reologiczny, napisane w języku FORTRAN. Wyniki obliczeń porównano z danymi literaturowymi. Dokonano analizy celowości stosowania wzmocnień taśmami CFRP w aspekcie zjawisk reologicznych. Stwierdzono bardzo korzystny wpływ tego typu wzmocnienia na wartości reologicznych przyrostów ugięć, które są o wiele mniejsze w przypadku belek wzmocnionych w porównaniu do belek litych.

20

Wybrane zagadnienia dynamiki nawierzchni drogowej podatnej. Zastosowanie mes przy wykorzystaniu programu ABAQUS

Tutka P., Nagórski R.

TTS Technika Transportu Szynowego

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2015

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R. 22, nr 12

1588--1594, CD

PL

Podstawowym celem pracy jest budowa modelu numerycznego nawierzchni drogowej służącego do analizy dynamicznej wraz z jego walidacją i analizą czynników mających wpływ na poprawność wyników. Dodatkowo celem jest zbadanie wpływu efektów dynamicznych na ugięcia i kluczowe odkształcenia przy wymiarowaniu nawierzchni w porównaniu z wynikami analizy statycznej MES i wynikami obliczeń za pomocą programu VEROAD (przy wykorzystaniu metod analitycznych). Do wyznaczenia stanu przemieszczeń i odkształceń został użyty program ABAQUS/Explicit. Zastosowano model trójwymiarowy MES, tj. przyjęto obszar 3D modelowany elementami skoń-czonymi, dokonano wyznaczenia rozmiarów tego obszaru wraz z odpowiednimi warunkami brzegowymi. Zamodelowano dwie drogowe konstrukcje nawierzchni, o liniowo-sprężystych własnościach materiałowych. Wpływ lepko-sprężystości warstw asfaltowych został uwzględniony przez przyjęcie modułów dynamicznych sztywności jako modułów sprężystości. W obliczeniach uwzględniono dwie prędkości obciążenia odpowiadające ruchowi pojazdów ciężkich – małą prędkość 5 km/h i typową 60 km/h. Wykazano, że przy przyjętych założeniach i danych wpływ efektów dynamicznych w porównaniu do modeli statycznych jest praktycznie pomijalnie mały.

EN

The main purpose of the paper is to create a numerical model for pavement dynamic analysis, including its validation and analysis of the factors affecting the correctness of the results. Another aim is to examine the impact of dynamic effects on the deflections and key strains, with a comparison to the results of the static FEM analysis and results of computation from VEROAD program (using analytical methods). ABAQUS/Explicit program was used to determine key components of displacements and strains. A 3D FE model was applied. Studies included determination of the size of the domain modeled by finite elements and boundary conditions. Two pavement models were analysed and linear-elastic material properties were assumed. Viscoelastic properties of asphalt layers were taken into account by the use of dynamic stiffness modulus as elastic modulus. The experimental program for this study included two different load speeds corresponding to the traffic of heavy vehicles – the small speed 5 km/h and typical one 60 km/h. It has been proved that for assumed data the dynamic effects in comparison to static behavior of the pavement can be neglected.