Collapse Analysis of Long-Span Reinforced Concrete Continuous Bridge Under Extreme Earthquakes


Abstract eng:
Long-span bridge structures tend to fail under the extreme earthquakes, and nonlinearity should be considered in simulating this kind of event. It is difficult to simulate seismic-induced bridge collapse numerically with finite element analysis though, because the large degrees of freedom of the bridge model will result in unacceptable computational costs. Therefore, a simplified finite element model of the reinforced concrete continuous bridge is necessary to consider the nonlinearities of the bridge with high computational efficiency. In addition, the bearing capacities of fixed bearings are normally assumed to be infinite, and their influences on seismic damage of the bridge are neglected. In a real bridge, the bearing capacities of fixed bearings are designed to restrain the lateral displacements of girders, which will affect the response of the overall bridge structure. In this paper, a simplified finite element model was established for a typical three-span reinforced concrete continuous bridge. The simplified finite element model is verified to be effective by comparing the numerical results with the experimental results on mechanical behavior of the reinforced concrete pier and girder, and by comparing dynamic property of the bridge obtained using the simplified finite element model and a detailed finite element model. The collapse process of the reinforced concrete continuous bridge with different bearing capacities under the extreme earthquakes are simulated, and the collapse modes are analyzed. The numerical results indicated that the bearing capacity had an important influence on the collapse modes of the bridge.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 4511.:
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