摘要
对能力-需求曲线法提出了三方面改进,即直接以 POA 侧推曲线换算得的能力曲线代替简化二折线能力谱、用具有包络意义的双能力曲线考虑加载模式的不确定性、用双需求力曲线考虑结构非线性恢复力模型的不确定性;对改进能力-曲线方法与时程分析方法的计算结果进行了对比,并给出了具有统计意义的改进能力-需求曲线方法结果的评判方法。算例表明,改进方法能够有效减小能力谱和需求曲线建立过程中不确定性因素对分析结果所造成的误差,具有更好的工程适用性。
The capacity-demand-diagram method is improved in three aspects.The first one is to substitute the sim- plified bi-linear capacity spectrum with the actual curve obtained by POA.The second one is to use two capacity curves to consider the uncertainties of the lateral loading modes.The third one is to use two demand curves to con- sider the uncertainties of the nonlinear hysteretic models.The results obtained by the improved method are com- pared with those of the time history analysis method,and an expected value of the results is given.Examples show that the improved method may reduce the uncertainties in the determination of capacity spectra and demand curves and is more suitable than the original method.
出处
《世界地震工程》
CSCD
2003年第4期28-33,共6页
World Earthquake Engineering
基金
国家自然科学基金(50008017)