通过对西安火车站东配楼结构的缩尺模型振动台试验，考察结构在不同水准地震作用下的破坏模式和抗震性能。对模型结构进行数值模拟，对比分析了不同工况下结构的自振频率、加速度和位移等动力响应的发展规律。结果表明，模拟计算结果与试验吻合较好，在8度罕遇地震后结构刚度退化最明显，其中小三角区X、Y向刚度分别降低了39.66%、37.50%，模拟值也达到了33.43%、28.79%，相差不足6%。连体结构在弹性和弹塑性阶段的最大层间位移角分别为1/554和1/53，满足抗震规范的限值要求。大跨度桁架采用滑动支座可有效释放小三角区与大区间的相对位移，保证了连体结构较好地协同工作和变形能力。在9度罕遇地震下，叠层桁架动力响应较大，刚度退化率达到23.73%，平面外扭转角1/56，位移比达到1.36，建议设置黏滞阻尼器控制桁架振动。
Abstract
Through shaking table tests for the scale model of east building of Xi’an railway station, the failure mode and aseismic performance of the structure under different levels of earthquake were investigated.Numerical simulation was performed for the model structure, and development laws of dynamic responses, such as, natural frequencies, accelerations and displacements of the structure under different working conditions were compared and analyzed.The results showed that the simulation results agree better with the test ones; the structural stiffness degradation is the most obvious after 8° rare earthquake, X direction stiffness and Y direction one of the small triangle zone drop by 39.66% and 37.50%, respectively and their simulation values drop by 33.43% and 28.79%, respectively with differences of less than 6%; the maximum story drifts of the structure in elastic stage and elastic-plastic one are 1/554 and 1/53, respectively to meet the limited value requirements in aseismic code; sliding support is used in large-span truss to effectively release relative displacement between small triangle zone and large one to ensure the conjoined structure being able to work cooperatively and deform well; under 9° rare earthquake, the dynamic response of laminated truss is larger, its stiffness degradation rate reaches 23.73%, its out of plane torsion angle reaches 1/56, and its displacement ratio reaches 1.36, so setting viscous damper is suggested to control truss vibration.
关键词
不规则连体结构 /
振动台试验 /
叠层桁架 /
柔性连接 /
动力响应
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Key words
irregular conjoined structure /
shaking table test /
laminated truss /
flexible connection /
dynamic response
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