Wyniki wyszukiwania - BazTech

1

Evaluation of bearing capacity of multi-span spandrel-braced stone arch bridge based on static load test

Gao Hongshuai, Duan Hourui, Sun Yue, Jian Jiashuo, Zhang Jingyuan, Liu Hongbo

Archives of Civil Engineering

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2022

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Vol. 68, nr 4

633--651

EN

Stone arch bridge is an important type in the early bridge construction process because of its beautiful shape, material saving and economic rationality. However, stone material will deteriorate after long-term operation, which results in a decrease in strength and bearing capacity of stone arch bridge. The vehicle load is increasing at the same time. Therefore, accurate evaluation of bearing capacity of stone arch bridge is essential to ensure safety. In this article, a three-span open-spandrel stone arch bridge was taken as research object. Firstly, the bridge damages were investigated and analyzed in detail, and bridge service state was evaluated. Then, based on the evaluation results of disease damages and considering stone material deterioration, a refined finite element model of stone arch bridge was established to analyze bending moment, axial force, strain and deformation. Finally, static load test was carried out to test vertical deformation and stress of arch ring, horizontal displacement of pier, settlement of foundation and development of cracks. The results show that static load test is the most accurate method for evaluating bearing capacity of stone arch bridge. The evaluation accuracy of finite element model based on material correction is in the middle, and the evaluation accuracy of disease damage assessment is the worst. In practical work, bearing capacity of stone arch bridge can be evaluated by combining the three methods with high accuracy and comprehensive results.

2

Zmodernizowany most Łazienkowski w Warszawie – analizy z wykorzystaniem modelu numerycznego MES

Binczyk M., Żółtowski K.

Materiały Budowlane

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2016

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nr 4

38--40

PL

W artykule przedstawiono proces modelowania statycznego przęseł mostu Łazienkowskiego w Warszawie, który został poddany odbudowie po pożarze 14 lutego 2015 r. Sprawdzające obliczenia numeryczne wykonano w związku z badaniami konstrukcji podczas próbnego obciążenia. Przeprowadzono weryfikację obliczeń projektowych i zaprojektowano próbne obciążenie. Podsumowano wyniki analizy i badań. Dodatkowo opisano nową, stalową konstrukcję nośną obiektu i proces jej montażu.

EN

The paper presents the process of FEM modeling of superstructure of the bridge Lazienkowski in Warsaw, which was reconstructed after the fire of 14 February 2015. Verifying numerical analysis of carrying capacity was made in connection with the design of load test procedure. Checking analysis of designed superstructure was performed and test the load configurations were developed. Summary of the results of analysis and tests are given in the work. In addition a new, steel supperstructure and erection process is described.

3

Behaviour of steel-soil bridge structure made of corrugated plates under field load tests. Part 1: Dynamic research

Mańko Z., Bęben D.

Engineering Transactions

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2006

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Vol. 54, iss. 1

35-50

EN

The paper presents the results and conclusions of dynamic load tests that were conducted on a road bridge over river Giman in Sweden (the first bridge of this type in Scandinavia) made from Super Cor corrugated steel plates. Conclusions drawn from the tests can be mostly helpful in the assessment of behaviour of this type of corrugated plate bridge with backfill. In consideration of application of this type of structure in the case of small-to-medium more and more frequent span of bridges, the conclusions from the research will be generalized to all types of such solutions.

4

Behaviour of steel-soil bridge structure made of corrugated plates under field load tests. Part 1: Static research

Mańko Z., Bęben D.

Engineering Transactions

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2006

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Vol. 54, iss. 1

3-34

EN

The way in which a new road bridge made from Super Cor steel plates was tested is described and the test results, for three static load schemes in which one ballasting vehicle (a Scania truck) was used as the load, are presented. The tested bridge has a box structure and it is located on the Giman River in Giman, Sweden on the Bracke - Holm road. The bridge has an effective span of 12.315 m and a clear height of 3.555 m. The steel shell of the span is founded on two reinforced concrete continuous foundations. The average measured displacements and unit strains (normal stresses) in selected points and elements of the steel shell structure were found to be much smaller than the ones calculated for the same load. The conclusions drawn from this research can be useful for assessing the behaviour of such steel shells and their interaction with the surrounding backfill. Since such steel-soil structures are used more and more often for small and medium-sized bridges on road and railway lines in Poland and in the world, the conclusions from the static load tests can be generalized to a whole class of similar bridge structures.

5

Assessment of the failures static consequences on concrete bridge made of precast beams

Nad' L.

Czasopismo Techniczne. Budownictwo

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2004

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R. 101, z. 11-B

121-136

EN

This paper presents an extraordinary occasion - "strong" static load test and dynamic load test of a 35 years old bridge as well as the "total" - destructive load test of 5 precast 21,4 m long beams, excavated from this bridge before its demolition. The paper also describes estimation of computational model for a transversally prestressed skew bridge, and the problem related to the reflection of influence the transversal prestressing on the load effect distribution in transversal direction. Rigid transversal connection is transformed to semi rigid after the load increasing. Theoretical analysis of these two models is confronted with experimental results, obtained during the bridge load test. The results, their analysis and conclusions from these load tests as well as theoretical analysis serve as basic material for the guideline for evaluation of existing precast bridges.

PL

W niniejszym artykule zaprezentowano wyjątkową okazję - zaostrzoną statyczną próbę obciążenia i próbę dynamiczną mostu po 35 latach eksploatacji, jak również "totalną" - destrukcyjną próbę obciążenia 5 prefabrykowanych belek o długości 21,40 m. Belki z mostu "wyjęto" przed jego zburzeniem. Opisano odpowiedni model obliczeniowy dla skośnego, poprzecznie sprężonego mostu i problemy związane z wpływem poprzecznego sprężenia na poprzeczne rozłożenie obciążenia mostu. Sztywne poprzeczne połączenie belek po zwiększeniu obciążenia zmieni się na półsztywne. Analiza teoretyczna tych dwóch modeli obliczeniowych jest konfrontowana z wynikami eksperymentalnymi, uzyskanymi przy próbie obciążenia. Wyniki, ich analiza i wnioski z prób obciążenia, razem z analizą teoretyczną, tworzyły podstawowy materiał do sformowania wytycznych odnośnie oceny istniejących mostów z prefabrykowanych belek.