Earthquakes and Structures

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The effect of finite element modeling assumptions on collapse capacity of an RC frame building

  • Ghaemian, Saeed (Department of Earthquake Engineering, Earthquake Engineering and Disaster Management Institute, Istanbul Technical University) ;
  • Muderrisoglu, Ziya (Department of Civil Engineering, Faculty of Engineering and Architecture, Beykent University) ;
  • Yazgan, Ufuk (Department of Earthquake Engineering, Earthquake Engineering and Disaster Management Institute, Istanbul Technical University)
  • Received : 2019.10.22
  • Accepted : 2020.01.23
  • Published : 2020.05.25
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Abstract

The main objective of seismic codes is to prevent structural collapse and ensure life safety. Collapse probability of a structure is usually assessed by making a series of analytical model assumptions. This paper investigates the effect of finite element modeling (FEM) assumptions on the estimated collapse capacity of a reinforced concrete (RC) frame building and points out the modeling limitations. Widely used element formulations and hysteresis models are considered in the analysis. A full-scale, three-story RC frame building was utilized as the experimental model. Alternative finite element models are established by adopting a range of different modeling strategies. Using each model, the collapse capacity of the structure is evaluated via Incremental Dynamic Analysis (IDA). Results indicate that the analytically estimated collapse capacities are significantly sensitive to the utilized modeling approaches. Furthermore, results also show that models that represent stiffness degradation lead to a better correlation between the actual and analytical responses. Results of this study are expected to be useful for in developing proper models for assessing the collapse probability of RC frame structures.

Keywords

Acknowledgement

This research is supported and funded by the Scientific and Technological Research Council of Turkey (TUBITAK) for the project Risk of Collapse Based Rating of Damaged Low Rise Reinforced Concrete Frame Buildings Subjected to Aftershock Hazard with project number 213M454. This support is greatly acknowledged. We also wish to acknowledge and thank the National Center for High Performance Computing of Turkey (UHEM) for providing the computing resources used in this project.

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