摘要
位移延性是桥梁抗震性能的重要指标之一,以Pushover分析为基础的能力谱方法能够考察结构在地震下的弹塑性位移响应,是抗震性能评估的一种有效手段。文中阐述了能力谱法的基本原理,说明了基于弹塑性反应谱的能力谱方法在求解性能点时不需要进行迭代计算;基于弹性设计反应谱建立了相对应的弹塑性反应谱,结合某实桥,将能力谱方法和增量动力分析方法进行了对比,并根据不同的地震基本烈度和场地土类型进行了抗震性能评估。分析认为,能力谱方法计算简便,对结构1阶振型的地震响应占主导时,具有较好的精度,并能够基于设计反应谱来考察结构的弹塑性抗震性能,可用于桥梁抗震性能的评估。
For the seismic evaluation of bridges, the deformation ductility is one of the performance indices. Based on pushover analysis, the capacity spectrum method is suitable for calculating the inelastic seismic response. The theory and application of this method is introduced, and the capacity spectrum method based on elasto-plastie response spectrum for determining the performance point without iteration is explained. Comparison between the method and the nonlinear time history analysis is processed with an example. The inelastic demand spectrum is established according to the seismic design spectrum, and seismic evaluation of the bridge is accomplished based on the different basic seismic intensities and types of ground soil profiles. The results indicate that this method has creditable precision. In addition, the nonlinear seismic response can be achieved based on the seismic design spectrum.
出处
《世界地震工程》
CSCD
北大核心
2009年第4期174-180,共7页
World Earthquake Engineering
关键词
桥梁结构
抗震性能评估
能力谱法
性能点
弹塑性反应谱
bridge construction
seismic evaluation
capacity spectrum method
performance point
inelastic spectrum
作者简介
谭皓（1981-）男，工程师，硕士，主要从事桥梁设计．E—mail：tanhao0100@yahoo.com
