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为研究Y形偏心支撑高强钢框架结构的抗震性能,为该结构的抗震设计及其在抗震设防区应用提供依据,进行了一个1/2缩尺的3层Y形偏心支撑高强钢框架结构模型的振动台试验。采用模拟地震的方法,选取El Centro波、Taft波和兰州波,地震波加速度考虑从7度多遇到9度罕遇的烈度水平,通过试验结果,分析了Y形偏心支撑高强钢框架结构在水平地震作用下的动力特性、加速度反应、位移反应、剪力分布等。结果表明:在多遇地震作用下,结构刚度无明显退化,在8度和9度罕遇地震作用下,结构刚度退化明显,但结构仍具有较大抗侧刚度;结构在水平地震作用下以剪切变形为主;多遇地震下结构最大层间位移角为1/869,罕遇地震下结构最大层间位移角为1/129,均满足我国现行抗震设计规范对层间侧移角限值的要求;Y形偏心支撑高强钢框架结构具有良好的抗震性能,能够满足“三水准”抗震设防要求。最后,根据底部剪力法计算得到模型各层水平地震反应,计算值均大于实测地震反应值,这表明底部剪力法可以安全地用于Y形偏心支撑高强钢框架结构的地震反应计算。
In order to study the aseismic performance of Y-shaped eccentric high-strength steel frame structure, a ½-foot three-layer Y-shaped eccentric high-strength steel frame structure model was constructed for the seismic design of the structure and its application in earthquake- Shaker test. Using the methods of simulated earthquakes, El Centro wave, Taft wave and Lanzhou wave are selected. The acceleration of seismic waves is considered to be about 9 degrees while the seismic intensity is rarely encountered. Based on the test results, the effect of Y-shaped eccentric support high-strength steel frame structure on horizontal Dynamic characteristics of earthquake, acceleration response, displacement reaction, shear distribution and so on. The results show that under the action of frequent earthquakes, there is no obvious degradation of the structural stiffness. Under the action of rare earthquakes of 8 degrees and 9 degrees, the structural stiffness degenerates obviously, but the structure still has large lateral rigidity. Under the action of horizontal earthquake, Shear deformation is the main factor. When the earthquake occurs, the displacement angle of the largest story is 1/869 and the maximum displacement angle of the story under rare earthquakes is 1/129, which meet the requirements of the existing seismic design code in China for the lateral displacement limit Value requirements; Y-shaped eccentric support high strength steel frame structure has good seismic performance, to meet “three standards ” seismic fortification requirements. Finally, the horizontal seismic response of each layer of the model is calculated by the bottom shear method, and the calculated values are all greater than the measured seismic responses. This shows that the bottom shear method can be safely applied to the seismic response calculation of Y-shaped eccentric supported high-strength steel frame structures.