新型可恢复功能半刚性节点抗震性能试验研究

Experimental study on seismic performance of new earthquake-resilient semi-rigid joint

为了实现建筑功能的震后快速恢复,提出新型可恢复功能半刚性节点.新型节点主要由T形耗能板、带铰的预制梁柱和高强螺栓群组成.对4个该新型节点试件及1个同尺寸的焊接节点对比试件进行往复加载试验,考察新型节点的抗震性能,分析耗能区截面面积、长度、截面惯性矩对新型节点滞回性能的影响.结果表明:新型节点比焊接节点具备更好的承载能力、耗能能力和延性.在试验中,非弹性变形主要集中在耗能板,主体结构基本无损伤,更换T形耗能板能够快速恢复结构功能.不同耗能区长度、惯性矩表现出不同的破坏特征与抗震性能.提出简单的新型节点设计计算方法,可以有效预测各类新型节点在往复荷载作用下的受力性能与破坏特征;对比采用所提方法计算与试验记录得出的屈服载荷、极限载荷,两者最大误差分别为2.5%、12.8%.

A new type of semi-rigid joint with recoverable function was proposed,in order to realize the rapid recovery of building functions after earthquake.The new joints were mainly composed of T-shaped energy dissipation plates,prefabricated beams and columns with hinges,and group of high-strength bolts.Four specimens of the new joint and one comparison specimen with welding joints in the same size were tested by reciprocating load tests.The seismic performance of the new joint was investigated,and the influence of the energy dissipation zone parameters such as section area,length and section moment of inertia on the hysteretic performance was analyzed.Results show that the new joints have better carrying capacity,energy consumption capacity and ductility than welding joints.In the test,the inelastic deformation is mainly concentrated on the energy dissipation plate,and the main structure is basically intact.Replacing the T-shaped energy dissipation plate can quickly restore the structure function.Different length and moment of inertia of the energy dissipation zone show different damage characteristics and seismic performance.A simple calculation method of new joint design was proposed,the proposed method can effectively predict the mechanical performance and destruction characteristics of various types of new joints under reciprocating load.Compared the yield load and ultimate load calculated by using the proposed method with the test record,the maximum errors of the two were 2.5%and 12.8%respectively.