【摘要】 设计了一种空间框架梁柱节点伪静力加载试验系统,具有如下特点:采用梁端主动加载模式,柱端约束装置采用空间球型支座,梁端约束装置采用自主研发的套箍式球铰支座,在双向加载过程中不产生附加约束;易于采用各梁端作动器连通的同步加载规则,同时适用于伺服与非伺服加载模式。基于能量原理,将空间梁柱节点多梁端复杂滞回关系转化为等效柱端水平力-水平位移滞回关系,以更为合理地评价节点整体抗震性能。多组节点的验证性试验表明,该系统性能良好,适用于空间梁柱节点抗震性能试验研究。更多还原

【Abstract】 An pseudo-static testing system was designed for beam-to-column joints in three-dimensional(3D) frames.The following characteristics are identified.First,beam end loading pattern is adopted.The newly developed spherical bearings are used as the column end restraining apparatus with outer confiners to prevent additional constraints induced on the beam under bidirectional loading.Second,loading synchronization is easy to be realized by linking all actuators at beam ends.The proposed system is suitable for both servo and non-servo loading modes.Finally,the vertical force-displacement relationships at multi beam ends are equivalently expressed as the story shear force versus story drift relationship of one column based on the energy conservation principle,which ensures the reasonable evaluation of the seismic behavior of connections.Validation tests on several joint specimens demonstrated the merits and applicability of this testing system for experimental research on seismic behavior of beam-to-column joints in three-dimensional(3D) frames.更多还原