Pushover Analysis of RC Bridges Using Fiber Models or Plastic Hinges

Abstract eng:
Non-linear static procedures, such as pushover-based ones, have been continuously refined and improved along the past few years as a complement or even as an alternative to dynamic time-history analysis. On that matter, great relevance has been given to the procedure of the method itself. By other words, effort has been put in studying the best way to obtain the equivalent necessary SDOF structure quantities towards the performance point attainment. Prior to those aspects, substantial interest remains on the computation of the pushover curve for the original MDOF structure, where modeling aspects come up decisively. This paper intends to readdress that issue from the modeling type point of view. Currently, most of the structural seismic analyses are carried out considering either fiber-based or plastic hinge structural models. Depending on the choice, distinct ways of considering the non-linear behavior of the elements are regarded and different parameters and calibration procedures need to be set. With the purpose of investigating the accuracy of both modeling possibilities, a parametric study is conducted on different bridge configurations, comparing pushover curves as well as NSP results which make use of those pushover curves. Application issues, such as advantages and/or limitations, in each of the modeling types are discussed. Accuracy is tested with the goal of finding out if the option for one of the models is either desirable or irrelevant.

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