Title: Analysis of seismic strength reduction factors for shear-type structures
Abstract: In order to analyze the characteristic of the seismic strength demand for shear-type structures,this paper analyzes the relationship between ductility reduction factors and displacement ductility factors with structure natural vibration period by the nonlinear time-history analysis of single-degree-of-freedom systems subjected to earthquake ground motions in different site conditions.Ductility reduction factors of multi-degree-of-freedom shear-type systems are investigated through modifying the ductility reduction factors of equivalent single-degree-of-freedom systems.Based on the reinforced concrete frames structures with various seismic capacities,the seismic overstrength capacity of these frames designed according to China code for seismic design of buildings,by means of inelastic static pushover analysis,is assessed.Analysis results indicate that the site conditions,displacement ductility and natural vibration period have an important influence on the ductility reduction factors of single-degree-of-freedom.The ductility reduction factors of multi-degree-of-freedom systems are clearly smaller than that of equivalent single-degree-of-freedom systems.The structural overstrength factors decrease with increaing number of storey and seismic fortification intensity.The structural overstrength factors of the inner frame are greater than that of exterior frame.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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