Evaluation of Local Global Ductility Relationships for Low-Rise Masonry-Infilled Reinforced Concrete Frame Structures

摘要

The paper presents the findings on a parametric study of the period lengthening effects of low-rise masonryinfilledreinforced concrete frame buildings using an incremental dynamic analysis (IDA). Simplified 2Dbuilding models utilizing Bouc-Wen model for describing strength, stiffness degradation and pinching effectwere subjected to some selected ground motion records ranging from far to near field earthquakes in low to highseismicity regions. Simple equations correlating local to global ductilities derived from pushover (PO) analysisfor buildings under soft storey failure mechanism are proposed. The equations take into account the governingfactors like critical interstorey drift and number of storeys. The applicability of the equations was verified up to7-storey buildings from the results of IDA. Such simple ductility relationships are likely to facilitate mostly thecoefficient-based method, in which the typical PO analysis may be bypassed and allows making intuitive insightinto the seismic performance of buildings.