带纵向加强肋复合墙结构动力反应分析

Dynamic response analysis of the longitudinal reinforcing rib composite wall structure

采用脉动测试法测试带纵向加强肋复合墙结构示范工程房屋的动力特性,从而确定结构的自振频率;建立结构有限元数值模型,对该结构进行弹性及弹塑性时程分析,研究结构的动力反应,进而评估低层带纵向加强肋复合墙结构的抗震能力。动力反应分析结果表明:结构的破坏按先砌块后框格的顺序分阶段进行,带纵向加强肋复合墙结构具有两道抗震防线。结构变形以剪切变形为主,罕遇地震作用下结构损伤主要集中在门窗联肢墙体上,且门窗联肢墙体中窗洞两侧砌块的损伤程度最大,洞顶肋格砌块次之,洞底肋格砌块最小。最大层间位移角为1/773,结构表现出较强的抗倒塌能力。

The pulsation test method is used to examine the dynamic characteristics of the demonstration building with the longitudinal rib-reinforcement composite walls,and the natural vibration frequencies of the structure are obtained.The finite element structural model is established.The elastic and nonlinear time history analyses of the structure are carried out,to study the dynamic response of the structure.The seismic capacity of the low-rise longitudinal rib-reinforcement composite wall structure is evaluated.The results from the dynamic response analysis show that the damaging process of the structure has two stages,from the masonry blocks to the framework.It has two seismic fortification lines.The structural deformation is dominated by shear deformation,and structural damage is mainly concentrated in the vicinity of the door and window joint wall under the rare earthquake.Moreover,the damage degree of the blocks in the door and window joint wall varies with the locations,the most severe in the blocks at both sides of the windows,and then in the top frameworks and the bottom framework.The maximum story drift angle of the structure is 1/773,which exhibits strong seismic resistance.