底层填充墙平面不均匀布置对框架结构抗震性能的影响研究

Research on influence of plane irregular arrangements of bottom-layer filler walls on seismic performance of frame structure

我国抗震规范强调应估计框架结构的围护墙和隔墙的设置对结构抗震的不利影响,但在具体工程设计中一般并未详细考虑填充墙布置不均匀对框架结构的影响。历次震害调查表明,填充墙的不均匀布置会对结构抗震产生明显不利影响。采用FEMA 356的建议将填充墙等效为斜撑,并基于Open Sees建立了可反映填充墙退出工作的有限元模型。通过对某框架结构填充墙底层平面不均匀布置框架的动力弹塑性分析,从结构整体变形、构件内力及变形以及结构破坏机理等方面,深入分析填充墙平面不均匀布置对框架结构抗震性能的影响,进而提出针对填充墙平面不均匀布置的改进方案,并通过动力弹塑性分析验证方案的有效性。

Seismic design code of China provides that adverse effects of the retaining wall and partition wall of frame structure on the seismic performance of the structure should be estimated,but such influence of irregular arrangement of filler walls on the frame structure is not considered in detail in actual engineering design. The previous earthquake damage investigations show that irregular arrangement of filler walls has obvious adverse impact on the seismic performance of the structure. The recommendations of FEMA 356 were adopted to use equivalent strut to simulate filler walls,and the finite element model was established to simulate the work-quit process of filler walls by using Open Sees software. The dynamic elasto-plastic analysis was conducted on a frame structure with plane irregularly arranged filler walls at bottom layers. The influence of irregular arrangement of filler walls plane on the seismic performance of the frame structure was analyzed from perspectives of overall deformation, internal force and deformation of structure components, and structural failure mechanism. Then the improved scheme for plane irregular arrangement of filler walls was put forward,and the dynamic elastic-plastic analysis was conducted to verify the effectiveness of the scheme.