快速谐波荷载作用下仿古建筑双枋-柱组合件力学性能研究

Mechanical properties on antique buildings dual-lintel-column subassemblages under fast harmonic load

为研究仿古建筑双枋-柱组合件的破坏特征及力学性能,选取典型仿古建筑双枋-柱组合件作为模型结构,该结构采用钢-混凝土组合结构,并在枋-柱连接处设置黏滞阻尼器,采用快速谐波往复荷载形式的加载制度,对3个该类型结构模型的力学性能进行研究,其中包括2个布设黏滞阻尼器的试件及1个未布设阻尼器的对比试件。在试验研究的基础上,对其力学性能关键指标进行分析,包括滞回曲线、骨架曲线、延性性能及强度和刚度退化等。分析结果表明:采用钢-混凝土组合结构及通过合理设置黏滞阻尼器可显著提升仿古建筑关键受力节点的力学性能。布设黏滞阻尼器后双枋-柱组合件的滞回曲线包络的面积更大,骨架曲线下降段更平缓,变形能力有显著改善。承载能力提高13.9%~14.1%,延性提高13.0%~18.6%;黏滞阻尼器与结构可协同受力,显著改善结构破坏阶段的变形性能,提高结构的抗倒塌能力。

In order to study the failure characteristics and mechanical behavior of antique buildings dual-lintel-column subassemblag⁃es,typical archaize building dual-lintel-column subassemblages were selected as the model structure,and the specimens adopted the steel-concrete composite structure and viscous dampers are set at the connection.Total 3 specimens were designed and tested under fast harmonic load,including two specimens with viscous damper and one specimens without viscous damper.On the basis of experimental study,the key indexes of mechanical properties are analyzed,such as the load-displacement hysteretic curve of specimens and viscous damper,the skeleton curve,load-bearing capacity and deformation performance,stiffness and strength deg⁃radation.The results indicate that the mechanical properties of antique buildings dual-lintel-column subassemblages with steel and composite structures and viscous damper can significantly increase the mechanical properties,and the hysteretic curve of the damp⁃ing joint is plump.The descending phase of skeleton curves is smoother,and the deformation capacity has been significantly im⁃proved.The carrying capacity is increased by 13.9%~14.1%,and Displacement ductility is increased by 13.0%~18.6%.The vis⁃cous damper and the dual-lintel-column subassemblages can work together,which can significantly improve the deformation perfor⁃mance of the structure at the failure stage and enhance the collapse resistance of the structure.