P-Δ效应对结构动力特性的影响  

Influence of P-Δ effect on dynamic characteristic of structure

作　　者：梁仁杰[1,2] 吴京[1,2] 何婧 章丛俊[3] 

机构地区：[1]建筑安全与环境国家重点实验室,北京100013 [2]东南大学国家预应力工程技术研究中心,江苏南京210096 [3]南京工程学院,江苏南京211167

出　　处：《土木工程学报》2013年第S2期68-72,共5页China Civil Engineering Journal

基　　金：建筑安全与环境国家重点实验室开放课题基金;国家自然科学基金(51278105);江苏省青蓝工程

摘　　要：P-Δ效应对结构的动力特性有一定影响。为了在推覆曲线上求解性能点,应依据考虑P-Δ效应后的结构周期选择合适的弹塑性反应谱。由于模态分析无法考虑P-Δ效应的影响,用振动台试验中常用的白噪声扫描对结构动力特性的变化进行研究。结果表明:考虑P-Δ效应后结构的抗侧刚度降低,周期增大,这会导致结构受到的地震作用发生变化;P-Δ效应对结构的第一阶振型影响较明显,而对高阶振型影响较小。P-Δ effect has a certain degree of influence on the dynamic characteristic of the structure.In order to calculate the performance point in the pushover curve,the period with considering of the P-Δ effect should be applied to choose the appropriate inelastic response spectrum.Because the modal analysis ignore the influence of the P-Δ effect,the whitenoise commonly used in the shaking table tests is applied to analyze the change of the structural dynamic characteristic with P-Δ effect.The results indicate that the lateral stiffness of the structure decreases when the P-Δ effect is considered,and the period becomes large,which resulting in the change of the seismic force subjected by the structure.The influence of the P-Δ effect on the first mode is relatively significant,while that on the higher modes is small.

关 键 词：结构倒塌 P-Δ效应 动力特性 白噪声 

分 类 号：TU311.3[建筑科学—结构工程]