摘要
通过建立改进的框架-剪力墙协同工作的解析模型,得到结构未发生破坏时层间剪力的分布规律并找出决定层间剪力分布规律的主要因素。采用解析模型研究得出底部剪力墙破坏对结构周期、地震作用和框架剪力分布的影响,初步发现规范中为保证框架作为二道防线所进行的框架剪力调整存在不合理之处。然后以一个实际工程为例,研究多遇地震情况下和罕遇地震中连梁、剪力墙发生破坏的情况下框架部分层间剪力的变化情况,论证出在地震过程中框架部分的地震剪力很可能超过规范中对框架剪力的调整值,现行的调整方法恐不能保证结构的抗倒塌能力。最后指出设计框架作为结构的第二道防线,不能简单的通过对弹性情况下的框架剪力进行调整来实现,而应该建立在结构倒塌模拟的基础之上。
Through the establishment of the improved wall-frame analytical model for collaborative work, the interstorey shear force distribution of the undamaged structure is found and the main factors to determine the interstorey shear force distribution are identified. Based on the model, how the shear wall destruction causes changes in the structure period, seismic force and frame shear force distribution is studied, and it＇s preliminarily found that adjustment in the design code to make the frame as the secondary lateral force resist system of the structure is unreasonable. Then the interstorey shear force distribution for an actual project is studied ,for both the case of the frequent earthquake and the case that spandrels, shear walls are damaged in rare earthquake, and find that the seismic shear force of the frame in the rare earthquake process is likely to exceed the adjustment value in the code. The current adjustment method may not guarantee that the frame can prevent the seismic collapse of the structure. Finally, it points out that the design to make the frame as the secondary lateral force resist system of the structure, could not simply through adjustment of the shear force of frame in elastic analysis to achieve, but should be the based on structural collapse simulation.
出处
《四川建筑科学研究》
2013年第4期15-23,28,共10页
Sichuan Building Science
关键词
高层建筑
水平荷载
层间剪力
high-rise buildings
horizontal loadings
interstorey shear force
