On Intensity Measure Selection for Nonlinear Dynamic Analysis of Soil-Mdof Structure Interacting Systems

Abstract eng:
A major source of variability in seismic responses of structures arises from selecting the earthquake Intensity Measure (IM), for conducting nonlinear dynamic analysis, relative to the damaging effects of earthquakes on structures. In this paper, the capability of the six most common IMs on estimation of Engineering Demand Parameters (EDPs) of SoilMDOF Structure Interacting (SMSI) systems is investigated. Two-dimensional structural models of 5, 10 and 20 stories shear buildings are studied, using elasto-plastic MDOF stick models, whereas the underlying soil is considered as a homogeneous elastic half space and is modeled using the cone model concept. Then, the systems are subjected to 60 representative ground motions. The analyses are done directly in time domain using direct step-by-step integration method. This paper attempts to elucidate the accuracy and efficiency of considered methods for the evaluation of EDPs, in SMSI systems, and to find the most effective IM. For this purpose, two criteria are examined: (a) the median of EDPs in comparison with the predicted values, obtained from regression analyses, and (b) coefficient of variations of EDPs. The results show that a suitable IM for an EDP may differ from one to another in terms of accuracy and efficiency. Finally, the appropriate IM is proposed for each of the considered EDPs.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket