地震作用下框架结构三维弹塑性反应分析

利用弹塑性有限元理论和ADINA有限元结构分析软件,引入三维梁单元和壳单元,编制了框架结构空间弹塑性地震反应时程分析程序,并建立框架结构空间三维杆系模型,对地震作用下的框架结构进行了弹塑性反应分析,得到了结构的自振周期和顶层水平位移时程曲线.通过振型分析,模拟结果符合建筑物的实际震害,验证了程序的可靠性,表明采用ADINA建立有限元模型进行弹塑性地震反应分析是可行的,并具有较高的精度,为进行建筑结构弹塑性地震反应分析提供了新的手段.

Three-dimensional Elastic-plastic Reaction Analysis for the Frame Structure in Earthquake Action

Using elastic-plastic finite element analysis theory for reinforced concrete frame structure and ADINA finite element structure analysis software, the time analysis programs for the frame-structure's spatial elastic-plastic reaction with three-dimensional beam and shell unit, is programsd and spatial three-dimensional truss system model is established. Based on the analysis of the elastic-plastic reaction for the frame structure in earthquake action, the self-excited vibration's period and horizontal displacement-time curve are got up. Through the analysis the mode of vibration, the result of simulation accords with real shake-damage of the building is finded that, which verifies reliability of program and shows the feasibility and precision of using ADINA finite element program to analyse the elastic-plastic reaction of earthquake. A new reference basis and a new study method for the analysis of the earthquake reaction of building are offered.