混凝土结构基于位移的抗震能力设计

建筑结构良好的抗震性能是避免混凝土结构在罕遇地震下倒塌的根本保证 ,它主要取决于结构的延性 ,包括整体延性和构件延性。本文比较了我国现行的、基于概念的抗震设计方法和两种基于位移的抗震设计方法 :能力设计方法与能力谱设计方法 ,分析了这三种设计方法中 ,对结构延性考虑异同之处 ,并建议采用基于位移的抗震能力设计方法 ,定量地考察结构延性 ,保证混疑土结构在罕遇地震下具有充足的抗震能力。

In order to prevent the concrete structures from collapse under a seldom occurred earthquake,adequate seismic capacity should be provided.It relies mainly on the ductility of the structure,which includes total ductility and member ductility.The paper compares the conceptual design method in the current Chinese code based on the total seismic capacity,with other two seismic design methods based on displacement-capacity design method and capacity spectrum metod.The similarities and differences on their approach to ductility of these three design methods are analyzed.In order to study quantitatively the ductility of a structure and to ensure adequate seismic capacity of concrete structure under seldom occurred earthquake,it is suggested to use the displacement based design method of seismic capacity.Basic procedures of this method are given by a flowchart.