局部腐蚀损伤下钢结构整体抗震性能研究

Study on Seismic Performance of Steel Structures with Local Corrosion

为研究局部腐蚀损伤对钢结构整体抗震性能的影响,以某多层钢框架结构为例,利用ANSYS有限元软件建立了带有局部腐蚀构件的结构数值模型,静力计算和模态分析结果表明失重率在20%以内时,钢框架结构的最大应力和模态频率变化不大,但在有局部腐蚀损伤结构中的局部位置,尤其是与局部腐蚀构件连接的节点处,应力明显增加,达到21.6%。动力分析结果显示存在局部腐蚀作用下的钢框架结构,随着失重率的增加,结构整体刚度降低明显,失重率20%腐蚀损伤结构上最大应力相应增加22.2%。

In order to study the influence of local corrosion on the overall seismic performance of steel structures,a multi-layer steel frame structure is taken as an example.A numerical model of the structure with local corrosion components is established by using ANSYS finite element software.The results of static calculation and modal analysis show that when the weight loss rate is less than 20%,the maximum stress and modal frequency of the steel frame structure do not change much,but the stress increases significantly at local locations in the structure with local corrosion damage,especially at the nodes connected to the local corrosion components,reaching 21.6%.The dynamic analysis results show that as the weight loss rate increases,the overall stiffness of the steel structure under local corrosion decreases significantly,and the maximum stress on the structure with a weight loss rate of 20%increases by 22.2%.