K型斜撑轻钢墙体骨架拟动力试验数值模拟分析

SIMULATION ANALYSIS OF PSEUDO-DYNAMIC TEST ON K-BRACED LIGHT-GAUGE STEEL WALL FRAME

为分析轻钢结构墙体骨架在地震下的动力响应,对一面带有K型斜撑的墙体骨架进行拟动力试验,并用有限元软件ABAQUS对其进行拟动力试验模拟,与试验结果进行对比分析,验证模型的有效性,同时考虑不同的5种斜撑布置形式和3种墙体类型在地震下的响应,分析了斜撑数量和布置形式对墙体抗震性能的影响及不同类型的墙体在地震下的响应。结果表明:WCS-2比WCS-1杆件数量少6根,抗侧刚度下降了50. 49%; WCS-3比WCS-1杆件数量少8根,抗侧刚度下降了62. 38%;相比WCS-2、WCS-5的布置形式,WCS-4的抗侧刚度较大,布置形式更优;带门的墙体比带窗的墙体在多遇地震下的抗震性能要好,且此类墙体破坏位置集中在门窗洞口和中间一排节点杆件交接处,这些位置是此类墙体的最薄弱区域,在设计和安装时应有所加强。

In order to analyze the dynamic response of light-gauge steel structure wall frame under earthquake,the pseudo-dynamic test was carried out on a wall frame with a K-type inclined brace. The ABAQUS finite element software was used to establish a 1 ∶ 1 wall 3 D model in the pseudo dynamic test simulation,and compared with the test result analysis to verify the validity of the model,considering the response of four different kinds of brace layout and three types of wall under seismic. the influence of the number of inclined support and the layout on the seismic performance of the wall and the response of wall type under the earthquake were analyzed. The results showed that:the number of bars of WCS-2 was 6 less than WCS-1,and the stiffness decreased by 50. 49%,-the number of bars of WCS-3 was 8 less than WCS-1,and the stiffness decreased by 62. 38%;compared with WCS-5 and WCS-2,the layout form of WCS-4 was best;the wall with the door was faster than the stiffness of the wall with windows on the stiffness degradation;the damage location of the wall was concentrated on the door and window opening and the intersection of bars in the middle row of joints. These positions were the weakest areas of the wall and should be strengthened during the design and installation.