考虑框架抗侧力贡献的联肢钢板剪力墙抗地震倒塌性能研究

Study on earthquake collapse resistance of coupled steel plate shear wall considering the contribution of lateral force-resisting frame

联肢钢板剪力墙结构中连梁对墙肢的耦联作用可提高结构的抗倾覆能力,传统设计方法中假定层间剪力完全由剪力墙板承担,剪力墙板边框的抗侧能力仅作为结构的超强储备。当此超强储备与结构设计中其他超强因素叠加时,结构的用钢量增加、经济性降低。为充分利用墙板边框和连梁耦联作用的抗侧力贡献,该文介绍了以抗侧能力超强度为参数的联肢钢板剪力墙塑性设计方法。为验证设计方法的有效性,设计不同墙板宽高比和连梁承载力的钢管混凝土框架-联肢钢板剪力墙原型结构,进行静力推覆分析和增量动力分析,研究原型结构的屈服机制和抗地震倒塌性能。结果表明:按照文中方法设计的钢管混凝土框架-联肢钢板剪力墙结构屈服顺序合理,可实现多道设防的抗震目标。在同等强度的地震作用下,结构的倒塌概率随墙板宽高比的增大而增大,连梁承载力对倒塌易损性曲线影响较小。结构的倒塌储备系数随层数或墙板宽高比的增大而减小,受连梁承载力的影响较小。各原型结构在罕遇地震下的倒塌概率小于10%,满足大震不倒的设防目标。

In a coupled steel plate shear wall,the interaction between two steel plate shear wall piers enabled by the coupling beams may improve the overturning capacity of the lateral force-resisting system.In the traditional design method,it is assumed that the inter-story shear is completely resisted by the shear wall plates,and the contribution of boundary frame to lateral resistance is only used as reserved overstrength in the structure.When the reserved overstrength and the other overstrength parameters in the structural design are superposed,the steel consumption of structure increases,but the economy decreases.In this work,a plastic design method with the overstrength of the lateral force capacity taken as a parameter,which makes full use of the lateral force-resisting action from the boundary frame and coupling beam,is proposed.To verify the effectiveness of the design method,concrete filled steel tube frame-coupled steel plate shear wall archetypes with different width-to-height aspect ratio of the wall plate and strength of the coupling beam are designed.The static pushover analysis and incremental dynamic analysis are conducted to study the yielding mechanism and earthquake collapse resistance of archetypes.Results show that the concrete filled steel tube framecoupled steel plate shear wall system designed by the proposed method may exhibit a desirable yielding sequence and the objective of multiple fortification in seismic design can be achieved.The collapse probability of structure increases with the increase of width-to-height aspect ratio of the wall plate under same magnitude of earthquake.The strength of the coupling beam has less influence on the collapse fragility curve.The collapse margin ratio of the structure decreases with the increase of the number of stories or width-to-height aspect ratio of the wall plate.The collapse margin ratio of the structure is less affected by the strength of the coupling beam.The collapse probability of each archetype is less than 10% in the rare occurrence earthquake,satisfying the seismic precautionary objective that the structure may not collapse in the rare occurrence earthquake.