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结构延性折减系数反映了结构非弹性变形能力的大小,它是基于承载力抗震设计中确定的设计地震力的关键因素,也是基于性能抗震设计中确定的等延性非弹性反应谱的主要依据。考虑不同设防烈度、不同层数,严格按现行抗震规范设计了17个典型RC框架结构,采用OpenSees进行有限元建模与分析,并采用结构拟静力试验数据对有限元模型进行验证。通过比较弹性与非弹性体系在同一强度地震动作用下的反应,得到了按现行抗震规范所设计的结构延性折减系数能力值的取值及其变化规律。结果表明,采用结构延性折减系数能力值,可以定量评定结构在强震作用下的非弹性耗能能力。按我国现行抗震规范设计的6、7、8度的RC框架结构,结构延性折减系数能力值的最小值分别为3.7、3.5、3.2。
Structural ductility reduction factor reflects the size of the structure inelastic deformation capacity, which is based on the bearing capacity of the seismic design of the key factors in the design of seismic forces, but also based on the performance of the seismic design of the equivalent ductility inelastic response spectrum of the main basis. Considering different fortification intensity and different stratum, 17 typical RC frame structures were designed strictly according to the current seismic code, and the finite element modeling and analysis were carried out by using OpenSees. The structure pseudo-static test data was used to verify the finite element model. By comparing the response of elastic and non-elastic systems under the same seismic intensity, the values of the values of the ductility reduction coefficients of structures designed according to the current seismic code and their variation are obtained. The results show that the ability of structural inelastic energy dissipation under strong earthquakes can be quantitatively evaluated by using the value of structural ductility reduction factor. According to China’s current seismic code design of 6,7,8 degrees of RC frame structure, the structure of the minimum value of the ductility reduction factor were 3.7,3.5,3.2.