基于泸定6.8级地震某二层混凝土框架结构损伤分析

2022年9月5日四川甘孜州泸定县发生6.8级地震,相关台站记录到水平向地震动峰值加速度达到891cm/s²,竖直向地震动峰值加速度为175cm/s²,地震造成严重人员伤亡和建筑物倒塌。为进一步了解本次地震对建筑物破坏作用,采用大型通用有限元软件SAUSG2022,对震中某二层钢筋混凝土框架结构进行弹塑性动力时程分析。结果表明,在泸定地震动作用下,该建筑物损伤严重,有倒塌风险,损伤部位与损伤程度与现场情况基本相符。而采用隔震技术后,分析结果表明在泸定地震动作用下建筑物损伤轻微。

Damage Analysis of A Two-story Concrete Frame Structure Building Based on Luding M6.8 Earthquake

An earthquake with a magnitude of 6.8 occurred in Luding County,Ganzi Prefecture,Sichuan Province on September 5,2022,causing serious casualties and collapse of buildings. The relevant station recorded a peak acceleration of horizontal ground motion of 891cm/s² and a peak acceleration of vertical acceleration of 175cm/s². In order to clearly understand the damage effect of the earthquake on the building structures,the general finite element software SAUSG 2022 was used to carry out the elastic-plastic dynamic time history analysis of a two-story reinforced concrete frame structure at the epicenter of the earthquake. The results show that under the action of the Luding earthquake,the building is seriously damaged and there is a risk of collapse. The damage location and damage degree of the structure obtained by the finite element analysis are basically consistent with the field conditions. However,the analysis results indicate that if the isolation technology was adopted,the damage degree to the building will be decreased.