纵向抗震支吊架拟静力试验研究

Study on longitudinal seismic bracing by applying quasi-static testing

一直以来,科研工作者和设计师们对结构抗震都很重视,但是对支吊架类非结构构件的震害认知和抗震研究都远远的落后于主体结构抗震。对抗震支吊架在地震作用下的内力传递、破坏机理等力学行为的研究仍然是相当欠缺的。以一实际地铁车站中抗震支吊架安装工程为背景,设计了三种不同纵向斜撑安装位置的试件,通过拟静力试验加载,研究纵向抗震吊架的力学行为,分析其传力路径与破坏原理,为设计合理的纵向抗震支吊架方案提供试验数据和研究支撑。试验结果表明,在本项目中建议选择试件Z2,即纵向斜撑安装在靠近管线荷载产生的地震惯性力合力作用点标高位置,以最短的传力路径发挥最大的抗力效能。另外,本次试验中所有失效或者破坏都是由于连接件变形过大甚至剪断造成的,因此支吊架中连接件的设计和加工质量值得重点关注。

For a long time,scholars and engineers have attached great importance to seismic analysis of building and infrastructures,while study on dynamic response and anti-seismic performance of nonstructural components such as seismic bracings are far behind that of the main structure.The research on the mechanical behaviors including resistant performance and failure mechanism of seismic bracing is still quite lacking.Based on a real project with seismic bracing installed in a subway station,three specimens with different installation positions of longitudinal diagonal braces are designed for the research purpose.By applying quasi-static testing,the mechanical behavior of longitudinal seismic bracing are studied,including their force transmission path and failure process,so as to provide testing data and research basis for the design of reasonable longitudinal seismic bracing scheme.The test results show that in this study,it is recommended to select specimen Z2,i.e.,the specimen with longitudinal seismic bracing installed near the elevation of the resultant force of seismic inertial force generated by pipeline load,so as to maximize the resistant effect with a shortest force transmission path.In addition,all failure or damage recorded in this test are caused by excessive deformation or fracture of bracing connectors.Therefore,the design and quality control of these connectors in deserve special attention.