横墙对框架结构动力响应的影响分析

Analysis of Influence of Transverse Wall on Dynamic Response of Frame Structures

填充墙具有显著的刚度和承载力贡献。建筑结构震害调查发现,不开洞横墙的破坏程度远小于开洞纵墙的破坏程度,从宏观现象可判断大部分多层建筑的破坏主要由结构纵向运动造成。为研究横墙在地震作用下的性能及其对结构整体动力响应的影响,以经受2021年5月21日云南漾濞6.4级地震震害的花椒园小学教学楼为研究对象,按当地抗震计算参数进行弹塑性时程分析。采用等效斜压杆模拟横向填充墙,设置无填充墙框架结构、带黏土砖墙的框架结构、带空心砖墙的框架结构和带加气混凝土砌块填充墙的框架结构模型,选取10组地震波横向输入。研究结果表明,4种结构自振周期均处于具有统计学意义的平台段,平均加速度响应较接近,质量和刚度变化不会使结构加速度产生规律的变化;受结构自重影响,无填充墙的框架结构底部剪力小于带填充墙的框架结构,带填充墙的框架结构位移远小于无填充墙的框架结构;带有多道不开洞横墙的多层框架结构的破坏主要是由结构纵向破坏引起的。

The infilled wall has significant contribution to the stiffness and bearing capacity. The seismic damage survey of buildings shows that the damage of the transverse wall without opening holes is much less than that of the longitudinal wall with opening holes. It can be inferred from the phenomenon that most of the damage of the multi-story building is caused by the longitudinal movement of the structure. To study the performance of building transverse wall under the earthquake and its influence on the dynamic response of the whole structure, the teaching building of Huajiaoyuan Elementary School in the site of M6.4 Yangbi earthquake on May 21, 2021 is taken as the research object. The elasto-plastic time history analysis was carried out by using the local seismic calculation parameters.The equivalent inclined support was used to simulate the transverse infilled wall, and four research models were set up, namely pure frame, clay brick infilled wall, hollow brick infilled wall and aerated concrete block infilled wall. Ten groups of lateral input of seismic waves were selected. The results show that the natural periods of the four structures are all in the platform segment with statistical significance, and the average acceleration response is relatively close. The change of mass and stiffness will not have a regular change on the structural acceleration. Due to the weight of the structures, the base shear force of the pure frame structure is smaller than that of the structures with infilled walls. The displacement of the structures with infilled wall is much smaller than that of the pure frame structure.That the longitudinal failure is dominant in the multi-story frame structure with some transverse walls without opening holes.