Y形偏心支撑-高强钢框架结构抗震性能试验研究

为研究Y形偏心支撑-高强钢框架结构抗震性能，在已完成的1∶2缩尺3层模型结构振动台试验的基础上，重新设计了耗能梁段，并对该结构再次进行振动台试验。试验中选取El Centro波、Taft波和兰州波作为地震动输入并考虑7度多遇到9度罕遇的地震水准，分析了结构在水平地震作用下的动力特性、加速度响应、位移响应、应变响应、剪力分布等，并与已有试验结果进行了对比。通过ABAQUS建立了有限元分析模型，与试验结果进行对比。结果表明：该结构在多遇地震作用下处于弹性状态，在罕遇地震作用下表现为耗能梁段的局部破坏；耗能梁段破坏后，结构刚度大幅下降，但未发生倒塌；在多遇地震和罕遇地震作用下，结构的最大层间位移角满足抗震规范层间位移角限值的相关要求；在罕遇地震作用下，耗能梁段进入塑性状态而进行耗能，其他构件仍保持弹性状态；所建立的有限元模型可以有效模拟振动台试验结果。

Experimental study on seismic performance of high strength steel frames with Y-eccentric braces

In order to research the seismic performance of high strength steel frames with Y-eccentric braces (Y-HSS-EBFs), the shake table test of a 1∶2 scaled 3-story Y-HSS-EBFs with redesigned links was carried out with El Centro wave, Taft wave and Lanzhou wave from frequent earthquake level of 7 degree intensity to rare earthquake level of 9 degree intensity．The dynamic properties, acceleration responses, displacement responses, strain responses and story shear force distribution, etc, were obtained from the test and compared with the pervious test results. The finite element model (FEM) of the test structure was established by ABAQUS and the numerical simulation of the test was carried out. The test results indicate that the structure is in elastic during the frequency earthquakes and only local damage appeares at the links. The lateral stiffness of the structure degrades obviously during the rare earthquakes but there is no dangerous collapse for the structure. The maximum inter-story drift ratio of the specimen during the frequent and rare earthquakes can meet the requirements on inter-story drift ratio limitation in the seismic design code of buildings. Links enter the plastic stage to dissipate earthquake energy while other structural members remain in elastic stage during rare earthquake. The results provided by the FE analysis show a good agreement with the test results.