Seismic Response of RC Building Structures using Capacity Spectrum Method with included Soil Flexibility

摘要

Capacity Spectrum Method (CSM) is a current design tool to predict peak seismic performance of 2D and 3D structures. The general idea of the method can be extended including the influence of soil deformations on capacity spectrum. The design seismic, action is implemented through acceleration-displacement spectrum provided by EN 1998-1. The seismic demands and behaviour factors are then elaborated and studied in order to estimate the role of the of foundation flexibility. For both low-rise and multi-storey R/C frames displacement demands show tendency for decreasing when soil is becoming stiffer. For wall systems considered as 3D structures displacement demands are reduced due to soil stiffening. For 3D structures due to foundation flexibility effects of irregularity may grow up. In this paper, [1] some ideas for extending the existing capacity spectrum procedure are elaborated.