Wyniki wyszukiwania - BazTech

1

Świadome i bezpieczne budownictwo – mosty i wiadukty o dużej rozpiętości

Chojnacka Katarzyna, Wichłacz Tomasz

Materiały Budowlane

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2025

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nr 2

65--66

2

Zastosowanie programu ATENA do numerycznej analizy odkształceń belek żelbetowych

Kosmala Wiktoria, Domski Jacek

Przegląd Budowlany

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2024

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R. 95, nr 6

180--184

PL

W artykule przedstawiono analizę numeryczną odkształceń belek żelbetowych w programie ATENA. Przyjęto cechy materiałowe, geometrię i schemat obciążenia belek na podstawie badań laboratoryjnych, zrealizowanych w ramach rozprawy doktorskiej Mateusza Zakrzewskiego. Analizie poddano trzy belki, znajdujące się na jednym stanowisku badawczym, pracujące w schemacie czteropunktowego zginania, w rozstawie sił co 90 cm. Wszystkie elementy próbne wykonano z betonu z dodatkiem odpadowych włókien stalowych z opon samochodowych. Zbrojenie belek stanowiły pręty stalowe, umieszczone w ich strefie rozciąganej. Analiza obejmowała porównanie ugięć belek uzyskanych w programie ATENA z wynikami badań uzyskanymi pod obciążeniem doraźnym w kilku fazach obciążenia.

EN

The article presents a numerical analysis of deformations of reinforced concrete beams in the ATENA program. The material characteristics, geometry and load diagram of the beams were assumed based on laboratory tests in the doctoral dissertation of Mateusz Zakrzewski. Three beams located on one test stand, operating in a four-point bending scheme, with a force spacing of every 90 cm, were analyzed. All test elements were made of concrete with the addition of waste steel fibers from car tires. The reinforcement of the beams consisted of steel bars placed in their tension zone. The analysis included a comparison of beam deflections obtained in the ATENA program with test results obtained under temporary load in several loading phases.

3

Wpływ stopnia zbrojenia i średnicy prętów na odkształcenia trwałe w belkach wykonanych z betonu o wysokiej wytrzymałości

Bayat Hydayatullah, Ubysz Andrzej

Przegląd Budowlany

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2024

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R. 95, nr 7

35--38

PL

Na podstawie badań doświadczalnych wykonanych na belkach w skali półnaturalnej z betonu o wysokiej wytrzymałości pokazano, jak stopień zbrojenia i średnica stalowych prętów zbrojeniowych wpływają na wartości rezydualnych ugięć belek przy jej cyklicznych obciążeniach. Badania przeprowadzono na 4 seriach belek, w których na poszczególnych poziomach obciążenia pomierzono ugięcia całkowite i pozostające w zależności od poziomu wytężenia belki. Wyniki pokazano w postaci stosunku ugięć resztkowych do całkowitych w zależności od wartości obciążenia. Zmiana stosunku deformacji dla każdego zestawu belek jest analizowana pod kątem wymuszających cykli obciążeń na podstawie założeń sprężysto-plastycznego modelu betonu. Artykuł przedstawia również analizę dotychczasowych wyników badań opisanych w literaturze oraz wniosków autorów, które mają na celu ulepszenie współpracy betonu i stali dla betonów o wysokiej wytrzymałości.

EN

Based on experimental studies conducted on semi-natural scale beams made of high-strength concrete, it has been shown how the degree of reinforcement and the diameter of the steel reinforcing bars influence the values of residual deflections of beams under cyclic loads. The research was carried out on 4 series of beams, in which total and residual deflections were measured at different load levels, depending on the degree of beam stress. The results are presented in the form of the ratio of residual deflections to total deflections in relation to the load value. The change in the deformation ratio for each set of beams is analysed in terms of the imposed load cycles based on the assumptions of a elastic-plastic model of concrete. The article also presents an analysis of existing research results described in the literature, as well as the authors’ conclusions aimed at improving the interaction between concrete and steel for high-strength concretes.

4

Beton na kruszywie z recyklingu w belkowych elementach konstrukcyjnych

Sadowska-Buraczewska Barbara, Świerzbin Anna

Przegląd Budowlany

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2024

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R. 95, nr 3

106--109

PL

W pracy przedstawiono wyniki badań eksperymentalnych żelbetowych belek o przekroju prostokątnym o wymiarach 1100x120x80 mm wykonanych z betonów z wykorzystaniem kruszywa z recyklingu oraz belek kontrolnych jednorodnych wykonanych z użyciem kruszywa naturalnego. Badania w zakresie doraźnym obejmują ugięcia, odkształcenia, nośność i rysy belek z zastosowaniem kruszywa z recyklingu. Ponadto w pracy przedstawiono badania materiałowe zastosowanych betonów.

EN

The paper presents the results of experimental tests of reinforced concrete beams with a rectangular cross-section with dimensions of 1100x120x80 mm, made of concrete with the use of recycled coarse aggregate, and homogeneous control beams made of natural aggregate. Ad hoc tests include deflections, deformations, load capacity and cracks of beams using recycled aggregate. In addition, the paper presents material tests of the concretes used.

5

Evaluation of the stress-strain state of the RC beam with the use of DIC

Kopiika Nadiia, Klym Andriy, Blikharskyy Yaroslav, Katunský Dušan, Popovych Vasyl, Blikharskyy Zinoviy

Production Engineering Archives

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2024

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Vol. 30, Iss. 4

463--476

EN

The article presents the results of adapting the digital image correlation method for the possibility of diagnosing reinforced concrete structures. Reinforced concrete (RC) bending elements are the most widely used in construction practice, which determines the importance of reliable estimation of their stress-strain state. The purpose of this study includes reliable theoretical and experimental investigation of the strength and deformability parameters of the RC beam. The experimental study was conducted using digital image correlation and sub-micron contactless gauges. Experimental data was verified with the calculation of the stress-strain state of the RC beam according to DBN V.2.6-98:2009 and Eurocode 2 and the finite-element modelling (FEM). As a result, the values of deflections, concrete and rebar strains were obtained and presented as corresponding diagrams. The results of all the methods are within the same ranges. Also, the form and character of corresponding diagrams are very similar. The indicated deviations were within acceptable limits. It was noted that the theoretical calculation generally provides lower strain values, which is a satisfactory result, as it indicates the bearing capacity reserves provided by the current regulations. The propagation of cracks was monitored during the experiment and the measured cracks opening was compared with theoretical assumptions. Theoretical values are higher than experimental, which shows certain conservativity of valid normative regulations. The experimental and theoretical results were in good correspondence, which confirms their reliability. It was concluded, that the proposed in the study complex theoretic-experimental approach provides essential information about the strength and deformability of the structure

6

The behaviour of R.C. beams patch-repaired and strengthened with CFRP strips subjected to impact loading

Moyo Pilate, Habimana Philbert, Kabani Matongo

Materiały Budowlane

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2024

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nr 7

1--4

EN

This paper presents an experimental investigation of the structural behaviour of reinforced concrete (R.C.) beams, patch-repaired with a cementitious grout and strengthened with carbon fibre reinforced polymer (CFRP) strips subjected to impact loading. The results of this study show that strengthening patch-repaired R.C. beams subjected to impact loading using CFRP plates, restores the load-carrying capacity of the beams. The strengthened beams exhibited ductile behaviour with no debonding between the patch repair and the substrate concrete. The primary failure mode of the strengthened beams was intermediate crack (I.C.) debonding. In addition, the beams with longer patch length exhibited higher flexural strength.

PL

Artykuł przedstawia eksperymentalne badanie zachowania belek żelbetowych, naprawionych miejscowo za pomocą zaprawy cementowej i wzmocnionych taśmami z polimerów zbrojonych włóknem węglowym (CFRP), poddanych obciążeniom udarowym. Wyniki tego badania pokazują, że wzmocnienie miejscowo naprawionych belek żelbetowych za pomocą płyt CFRP przywraca nośność tych belek, poddanych obciążeniom udarowym. Wzmocnione belki wykazywały zachowanie plastyczne bez odspajania się naprawy miejscowej od betonowego podłoża. Głównym trybem zniszczenia wzmocnionych belek było odspajanie się pęknięć pośrednich. Dodatkowo, belki z dłuższą strefą naprawy wykazywały większą wytrzymałość na zginanie niż z krótszą.

7

Prefabrykacja belek do budownictwa mostowego

Adamczyk Kryspin

Materiały Budowlane

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2024

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nr 4

67--68

8

Load-bearing capacity and strain of the shear area of beams made of fine-aggregate fiber composite

Głodkowska Wiesława, Lehmann Marek

Materiały Budowlane

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2024

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nr 9

1--10

EN

The article presents selected results of shear tests of reinforced concrete beams made of fine aggregate composite with the addition of steel fibers in the amount of 1.2% in relation to the volume of the composite. 20 beams with different shear reinforcement ratio in the form of stirrups, with and without the addition of steel fibers, were tested. The results of tests of the shear capacity and strain of the side surface of beams and stirrups are discussed. The conducted research, which is a part of a wide research program, has show that the elaborated composite with steel fibers, whose properties are similar or better than that of ordinary concrete, can be successfully used to make structural elements in terms of shear resistance. Composite, due to its properties and nature of work in shear conditions, could be analternative to ordinary concrete in some applications.

PL

W artykule przedstawiono wybrane wyniki badań belek żelbetowych na ścinanie wykonanych z drobnokruszywowego fibrokompozytu z dodatkiem włókien stalowych w ilości 1,2% w stosunku do objętości kompozytu. Zbadano nośność na ścinanie dwudziestu belek o różnym stopniu zbrojenia w postaci strzemion, z dodatkiem włókien stalowych i bez włókien. Omówiono wyniki badań nośności oraz odkształcenia powierzchni bocznej belek i strzemion. Przeprowadzone badania, które są fragmentem szerokiego programu, wykazały, że opracowanego fibrokompozytu, którego właściwości są zbliżone lub lepsze od betonu zwykłego, można z powodzeniem użyć do wykonania elementów konstrukcyjnych w aspekcie nośności na ścinanie. Ze względu na właściwości i charakter pracy w warunkach ścinania fibrokompozyt byłby w niektórych przypadkach zastosowania alternatywą dla betonu zwykłego.

9

Badania na ścinanie belek zbrojonych podłużnie i poprzecznie prętami FRP

Szczech Damian, Kotynia Renata

Materiały Budowlane

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2024

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nr 4

32--36

PL

W artykule przedstawiono przegląd literatury w dziedzinie badania na ścinanie belek zbrojonych podłużnie i poprzecznie prętami FRP. Przegląd badań obejmuje zestawienie parametrów różnych zmiennych: rodzaju zastosowanego zbrojenia; wysokości użytecznej elementu; szerokości belek; smukłości ścinania; wytrzymałości betonu na ściskanie; stopnia zbrojenia podłużnego i poprzecznego; modułu sprężystości prętów; kształtu strzemion; porównania z elementami zbrojonymi prętami stalowymi, a także schematu statycznego. Na podstawie przeglądu wiedzy zaproponowano program badań własnych.

EN

This article presents a review of research in the field of shear tests of beams with longitudinal and transverse FRP reinforcement. The research review includes a summary of the parameters of various variables: type of reinforcement, depth of the element, width of the beams, shear span to depth ratio, compressive strength of concrete, longitudinal and transverse reinforcement ratio, modulus of elasticity of bars, shape of stirrups, comparison with elements reinforced with steel bars, as well as the static scheme. Based on the foreign studies the own research program has been proposed.

10

Algorithm for determining the bending capacity of concrete beams reninforced with BFRP bars according to ACI 440.1R-15 and fib Model Code 2010

Krassowska Julita, Klimasara Jan

Materiały Budowlane

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2024

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nr 11

26--35

EN

The article analyzes the available design recommendations for FRP reinforcement in relation to the standard ACI 440.1R-15 and fib Model Code 2010. Own tests on flexural capacity of concrete reinforced elements with BFRP bars were analyzed and the results were compared with the predicted theoretical load capacity.

PL

W artykule przeanalizowano dostępne zalecenia projektowe dotyczące zbrojenia FRP w świetle norm ACI 440.1R-15 oraz fib Model Code 2010. Dokonano analizy badań własnych zginanych elementów zbrojonych prętami BFRP, a wyniki porównano z przewidywaną nośnością teoretyczną.

11

O katastrofie budowlanej belki żelbetowej na skutek niespełnienia wymagań konstrukcyjnych

Drobiec Łukasz

Inżynieria i Budownictwo

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2024

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R. 80, nr 5

362--367

PL

Opisano przypadek katastrofy belki żelbetowej o znacznej, ponad 31-metrowej rozpiętości. Belka runęła w momencie rozpierania szalunków. Przeprowadzono badania materiałowe betonu i stali, które wykluczyły wpływ parametrów wytrzymałościowych tych materiałów na powstanie uszkodzeń. Wykonana analiza wykazała, że przyczyną katastrofy były błędy projektowe i wykonawcze, w tym niezachowanie normowych wymagań konstrukcyjnych.

EN

The failure and collapse of edge beam were caused by the synergy of the following factors: the improper design of beams in the axes A and E, particularly with reference to shearing and torsion, the improper design of the column in the axes A and 1, the improper design of laps in the reinforcement, the performance of laps in the reinforcement which did not match the design, and the inaccurate embedment of the beam in concrete. And lower class of concrete should be regarded as the secondary cause.

12

Research on the design method of flexural capacity of RC beams strengthen by ultra-high performance concrete

Wang Jiawei, Ying Feifei

Archives of Civil Engineering

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2024

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Vol. 70, nr 1

487--507

EN

Due to the increase in traffic volume, load level, and service life of existing bridges, the bending bearing capacity of reinforced concrete beams (hereinafter referred to as RC beams) has decreased, leading to safety issues. In order to solve the problem of insufficient flexural bearing capacity of RC beams, this article adopts the method of ultra-high performance concrete (UHPC) flexural strengthening RC beams, establishes a finite element model of UHPC-RC reinforcement system, and conducts stress analysis with reinforcement thickness, reinforcement range, reinforcement form, and reinforcement height as parameters to determine the optimal scheme of the reinforcement system. Based on the calculation results, a theoretical formula for the maximum principal stress and maximum deflection of the reinforcement system is proposed. To verify the feasibility of the plan, a reinforcement design was carried out on an existing beam, and it was found that the bending bearing capacity of the RC beam increased by 21%; the high tensile strength of UHPC and the addition of steel fibers have a good limiting effect on cracks; The steel plate of the reinforcement system can be used as a template, reducing construction costs and having good economy.

13

Parameter analysis and design method of ultra-high performance concrete shear strengthening RC beams

Wang Jiawei, Wang Ziqian, Ying Feifei, Yu Haitao

Archives of Civil Engineering

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2024

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Vol. 70, nr 2

431--445

EN

In recent years, bridge safety accidents caused by insufficient shear bearing capacity of bridges have attracted increasing attention. The main causes include internal factors such as insufficient bridge section and deterioration of steel bars, as well as external factors, for example, vehicle load surge and improper maintenance. To address this issue to some degree, this article adopts the method of strengthening RC beams with ultra-high performance concrete (UHPC) and conducts parameter analysis using finite element method, taking into consideration the influence of four parameters: reinforcement material, reinforcement thickness, reinforcement length, and reinforcement form on the shear strengthening characteristics of RC rectangular beams. After obtaining the optimal reinforcement plan through parameter analysis, the author applied the research results to an existing bridge with insufficient shear strength. It then turned out that the shear bearing capacity of the reinforced bridge’s inclined section increased by approximately 27.1%. Simple and fast in construction, this reinforcement method is one of the methods that is effective to increase cross-section reinforcement; besides, it features good economic characteristics and applicability.

14

Comparative study on externally bonded heat‑treated jute and glass fiber reinforcement for repair of pre-cracked high performance concrete beams

Benaddache Lysa, Belkadi Ahmed Abderraouf, Kessal Oussama, Berkouche Amirouche, Noui Ammar, Aggoun Salima, Chiker Tarek, Tayebi Tahar

Archives of Civil and Mechanical Engineering

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2024

|

Vol. 24, no. 2

art. no. e82, 2024

EN

The adoption of natural fiber reinforced polymer (FRP) composites as an eco-friendly substitute for synthetic FRPs in structural strengthening applications is gaining substantial momentum. This study delves into the effectiveness of jute fabric reinforced epoxy composites in bolstering the flexural strength of impaired concrete beams. An array of variables, encompassing the number of fabric layers (ranging from 1 to 3), fiber heat treatment, externally bonded reinforcement (EBR) configuration (soffit vs. U-shape), and fiber type (jute vs. glass), underwent systematic scrutiny. The comprehensive analysis of 30 pre-cracked high-performance concrete beams yielded compelling findings. In particular, the application of heat-treated jute EBR, especially when employing two or three layers, resulted in significant increases in peak loads, translating to improvements ranging from 85 to 120% when compared to the control beam. This treatment significantly improves the bond between the fibers and the matrix, consequently enhancing the structural performance. Notably, jute composites can attain equivalent strengthening performance compared to glass FRP while offering substantial cost savings and significantly reducing carbon emissions, rendering them a more environmentally sustainable and economically viable choice.

15

Wpływ otworów technologicznych na nośność belek żelbetowych

Pozorski Zbigniew, Lisowski Tomasz

Nowoczesne Hale

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2023

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Nr 2

42--50

PL

Zastosowanie otworów technologicznych w belkach pozwala na bardziej ekonomiczne wykorzystanie dostępnej przestrzeni budynku. Otwór w elemencie konstrukcyjnym, nawet jeśli jest mały, powoduje istotne zaburzenie w rozkładzie naprężeń i odkształceń. Z tego powodu w miejscach występowania małych otworów należy zapewnić dodatkowe zbrojenie przenoszące siłę tnącą. W artykule przedstawiono dwie metody wyznaczania niezbędnego zbrojenia wokół otworu: metodę standardową oraz metodę kratownicową.

EN

The use of technological openings in beams allows for more economical use of the available building space. An opening in a structural element, even if it is small, causes a significant disturbance in the distribution of stresses and deformations. For this reason, in places with small openings, additional reinforcement should be provided to transfer cutting force. The article presents two methods of determining the necessary reinforcement around the opening: the standard method and the truss method.

16

Szacowanie nośności belek żelbetowych wzmocnionych kompozytami CFRP

Michałowska-Maziejuk Dorota, Goszczyńska Barbara

Inżynieria i Budownictwo

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2023

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R. 79, nr 11-12

636--643

PL

W artykule przedstawiono propozycję prostego podejścia do szacowania nośności belek żelbetowych wzmocnionych taśmami CFRP, które zostało oparte na wynikach badań eksperymentalnych 10 belek żelbetowych. Badania 2 belek referencyjnych i 8 wzmocnionych taśmami CFRP wklejonymi w betonową otulinę (metoda NSMR) wykonano, symulując rzeczywiste warunki wykonywania wzmocnień. Belki zostały wzmocnione pod obciążeniem w pozycji sufitowej. Wyniki nośności belek uzyskane z badań porównano z wynikami obliczeń na podstawie zaproponowanego podejścia, przyjmując wytrzymałość betonu i stali z badań próbek towarzyszących, a także z normy dla zastosowanej klasy betonu i stali. Porównanie wskazuje na bezpieczne szacowanie nośności.

EN

The article presents a proposal for a simple method of estimating the load-bearing capacity of RC beams strengthened with CFRP strips, based on the results of experimental tests of 10 beams. Tests of two reference beams and eight beams strengthened with CFRP strips glued into the concrete cover (NSMR method) were carried out by simulating the real conditions of strengthening. The beams were strengthened under sustained loading were the strip was applied in the bottom side. The beam load-bearing capacity results obtained from the tests were compared with the calculation results based on the proposed simple method. To estimate the load-bearing capacity, the strength of concrete and steel from the accompanying tests and those provided in the standard regulations was adopted. The comparison indicates a safe estimation of the load capacity.

17

The influence of a polyurea coating on bent reinforced concrete beams with various reinforcement ratios

Szafran Jacek, Matusiak Artur, Rzeszut Katarzyna, Jankowiak Iwona

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2023

|

Vol. 71, nr 1

art. no. e144579

EN

“Polyurea coatings as a possible structural reinforcement system” is a research project aimed at exploring possible applications of polyurea coatings for improving structural performance (including steel, concrete, wooden and other structures used in the construction industry). As part of the project, this paper focuses on evaluating the performance of bent reinforced concrete (RC) beams covered with a polyurea coating system. Easy polyurea application and its numerous advantages can prove very useful when existing RC structural elements are repaired or retrofitted. Laboratory tests of three types of RC beams with three different longitudinal reinforcement ratios were performed for the purposes of this paper. The tests were designed to determine the bending strength, performance and cracking patterns of the coated RC beams. In addition, a theoretical model was developed to predict the impact of the polyurea coating on the bending strength of the RC beams. On this basis, the effect of the coating on the bending strength and the performance of the coated beams at the ultimate limit state (ULS) was examined and analyzed. The results showed that the use of the polyurea coating has a positive impact on the cracking state of the RC beams subject to bending and little effect on their bending strength.

18

Machine learning models for cracking torque and pre‑cracking stiffness of RC beams

Shenggang Chen, Quanquan Guo, Yingying Zhang, Hexiang Hu, Bei Shen

Archives of Civil and Mechanical Engineering

|

2023

|

Vol. 23, no. 1

art. no. e6, 2023

EN

The torsional behavior of RC beams is a complex work involving interactions of different design parameters and mechanisms. Considering the limitations and lower accuracy of traditional calculation theories, two machine learning models, including artificial neural network (ANN) model and random forest (RF) model, were applied for the frst time to predict the cracking torque and initial or pre-cracking torsional stiffness of RC beams. A comprehensive database consisting 159 experimental results of RC beams with solid or hollow sections was compiled, with input variables including dimension parameters of cross-section, compressive stress of concrete, elastic modulus and strength ratio of reinforcements. The performance of the models was appraised by various statistical estimators and safety ratio, and compared with different theories for cracking torque and initial stiffness. Among all the calculation models, RF model achieved the best overall prediction performance with the highest coeffcient of determination (R2=0.985 for cracking torque and R2=0.978 for initial stifness) and lowest root-mean-square error (RMSE=5.867 for cracking torque and RMSE=3.994 for initial stiffness). However, theories for cracking torque, i.e., plastic theory, Bredt thin-tube theory and skew-bending theory, gave huge underestimation, whereas greatly exaggerated initial stiffness was obtained by elastic theory and simplified soften membrane model for torsion theory. Besides, input variable importance analysis was conducted, revealing that dimension parameters of cross-section were the most critical features to decide prediction performance for pre-cracking torsional performance of RC beams. The achievements of this paper may provide references to the establishment of new predicting model for pre-cracking torsional response of RC beams.

19

Experimental and numerical analysis of shear performance of reinforced concrete beams with double openings

Chen Zongping, Xu Ruitian, Ling Zhiyan, Liang Ying, Lu Shiying, Qin Longshou

Archives of Civil and Mechanical Engineering

|

2023

|

Vol. 23, no. 3

art. no. e195, 2023

EN

In order to study the influence of load position and chamfer opening on the shear performance of reinforced concrete (RC) beams with double openings, five 1/3 RC beams were subjected to three equal point loading tests and ABAQUS finite element analysis. The study revealed that the position of the opening in the structure has a significant impact. When the opening is located in the bend-shearing section, shear force cannot be transmitted, resulting in brittle shear failure of the top chord. In contrast, if the opening is in the pure bending section, bending failure of the specimen occurs. The top chord's cross section exhibits a neutral axis, resembling a short beam, leading to the redistribution of normal stress at the opening. Shear capacity decreases as the loading point moves inward from the outside of the opening. Rectangular openings demonstrate better mechanical properties compared to chamfered openings. The findings from finite element analysis (FEA) suggest that the shear performance of RC beams with double openings is mainly influenced by the length of the opening in the bend-shearing section. The shear capacity relies on the presence of shear stirrups with the same length of the opening in the bend-shearing section. As a result, a revised calculation method for the shear bearing capacity of RC beams with double openings, based on different countries' standards, has been proposed. The revised approach was validated using experimental and FE specimens from this study, along with 32 RC beams with double openings from the previous literature. The calculated results demonstrate a satisfactory level of safety, with the revised Chinese standard deviation within 10%.

20

Investigation of defective reinforced concrete beams with obtained damage of compressed area of concrete

Blikharskyy Zinoviy, Lobodanov Мaksym, Vegera Pavlo

Production Engineering Archives

|

2022

|

Vol. 28, Iss. 3

225--232

EN

In the building industry, it is a frequent cause of damage to elements at different stages: during transportation, operation, installation, etc. Since replacing an element is not always possible due to various circumstances, it entails significant financial losses, logistics, and others. For this reason, the expediency of studying the effect of damage on the bearing capacity of reinforced concrete elements is growing. This effect is dependent on its type and has significant variability. In the case of the combination of the defect and damage in reinforced concrete elements, the complexity of the research of this element increases significantly. In this article is discussed: a review of damaged reinforced concrete elements; researching the influence of the damage and additional factors on the element; developed testing methodology for bending reinforced concrete elements with damage to concrete in a compressed zone with insufficient reinforcement, when performing damage to the action of the load and during the action of the load, is presented; the influence on the deformability and bearing capacity of the variability of damage on the sample with insufficient reinforcement is reflected, taking into account the factor of change in the load at which the damage is performed; a comparison is made of the dependence of the change in the actual height of the compressed zone on the change in the load on the elements; implementation of conclusions on the result of the study.