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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。
In order to study the aseismic performance of Y-shaped eccentric support-high strength steel frame structure, based on the completed shaking table test of 1: 2 scale 3-layer model structure, the energy dissipation beam was redesigned and the structure was again shaken test. In the experiment, El Centro wave, Taft wave and Lanzhou wave are selected as input of ground motions, and the seismometer level which rarely encounters 9 degrees at 7 degrees is selected. The dynamic characteristics, acceleration response, displacement response and strain of the structure under horizontal earthquake are analyzed. Response, shear distribution, etc., and compared with the existing test results. The finite element analysis model was established by ABAQUS and compared with the experimental results. The results show that the structure is in elastic state under the action of frequent earthquakes and local failure of energy dissipating beams under rare earthquakes. After the failure of energy dissipating beams, the structural stiffness decreases sharply without collapse; Under the action of earthquake and rare earthquake, the maximum inter-story drift angle of the structure meets the relevant requirements of the limit value of the inter-story drift angle of seismic code. Under the rare earthquake, the energy dissipating beam section enters the plastic state for energy dissipation. Still remain elastic state; the established finite element model can effectively simulate the shaking table test results.