T型方管节点滞回性能的试验研究  

Experimental study on the hysteretic behavior of T-type SHS joints

作　　者：武振宇[1] 陈鹏[1] 王渊阳[1] 

机构地区：[1]哈尔滨工业大学,黑龙江哈尔滨150090

出　　处：《土木工程学报》2008年第12期8-13,共6页China Civil Engineering Journal

基　　金：国家自然科学基金(50578055)

摘　　要：为了得到T型方管节点的滞回性能,为进一步研究方管结构的抗震性能打下基础。对轴向往复荷载作用下的12个T型方管节点进行试验研究。试验中6个节点采用弦杆两端约束的边界条件,其余6个节点采用弦杆中部约束的边界条件。得到节点试件的破坏模式和滞回曲线,以及用以评价节点抗震性能的主要参数(承载力、延性和能量耗散系数)。研究不同约束条件和几何参数对节点滞回性能的影响。将节点的极限承载力与单向荷载作用下我国规范公式(GB50017—2003)计算结果、CIDECT公式计算结果和有限元分析结果进行比较。结果表明:节点的破坏模式主要是受压时弦杆表面塑性变形和受拉时焊缝边缘开裂,导致在支弦杆交汇处被拉断;节点滞回曲线饱满,从节点域靠近弦杆侧壁的两侧开裂到节点完全破坏还有很大的耗能能力;焊缝尺寸对节点的滞回性能影响较大。In order to obtain the hysteretic behavior of T-type SHS-joints and lay the foundation for further study of the aseismic behavior of SHS structures, twelve T-type SHS joints subjected to axially cyclic load were investigated through laboratory tests. Six of these joints were supported at two ends of the chord, and a boundary condition of restricting the displacement in the middle of the chord was adopted for the other six joints. Failure modes and hysteretic curves of the joints were obtained, and the main parameters for estimating the earthquake resistant behavior of the joints were also studied, such as load-carrying capacity, ductility ratio and energy dissipation coefficient of the joints. The effect of different boundary conditions and geometrical parameters on the hysteretie behavior of the joints was analyzed. The ultimate capacities of the joints were compared with those obtained by using the code formula of the country （GB50017--2003） , the CIDECT formula and the finite element analysis for monotonic loading, respectively. The results showed that main failure modes of the joints included the plastic deformation of the chord face under the action of compression force, the cracking of the brace, or the chord at the edge of the connection welds under tension, which eventually led to the rupture of the brace section or the chord face. The hysteretic curves of the joints exhibited plump loops, and the joints still had good energy dissipation capacity from the crack emergence of the chord face near chord side walls at the joint region to the complete failure of the joints. The size of the joint weld also had a significant influence on the hysteretic behavior of the joints.

关 键 词：T型方管节点 滞回曲线 破坏模式 往复荷载 

分 类 号：TU392.3[建筑科学—结构工程]