附设黏滞阻尼器的仿古建筑混凝土枋-柱节点动力性能试验研究

Tests for dynamic performance of a concrete lintel-column joint with a viscous damper in archaized buildings

为研究附设黏滞阻尼器的仿古建筑混凝土枋-柱节点在地震作用下的抗震性能,设计制作了3个仿古建筑混凝土枋-柱节点,包括2个附设黏滞阻尼器的有控结构试件,1个未附设黏滞阻尼器的无控结构对比试件,对其进行动力试验。观察试件的受力过程及破坏特征,分析其受力机理及破坏模式,并研究了其荷载-位移滞回曲线、骨架曲线、承载能力、刚度退化等力学特性。试验结果表明:附设黏滞阻尼器的仿古建筑混凝土枋-柱节点抵御外荷载的能力明显高于未附设黏滞阻尼器的无控结构,屈服荷载提高幅度平均值约为27.4%,极限荷载提高幅度平均值约为22.4%;附设阻尼器的有控结构位移延性及耗能能力均优于无控结构,且有控结构的骨架曲线在达到极限荷载之后的下降段更为平缓;极限荷载时,有控结构的等效黏滞阻尼系数提高幅度约为27.3%~30.8%,说明附设黏滞阻尼器的仿古建筑混凝土枋-柱节点具有更为优越的抗震性能。

In order to analyze aseismic behaviors of a concrete lintel-column joint with a viscous damper in archaized buildings under seismic actions,3 specimens were made including two ones with viscous dampers called controlled structures and one without viscous damper called non-controlled structure. The dynamic tests were conducted for these 3 joints. Their failure process and patterns were observed. Their failure characteristics,load-displacement hysteretic curves,skeleton curves,load-bearing capacity and stiffness degradation were analyzed. The test results indicated that the load-bearing capacity of two controlled structures is obviously higher than that of the non-controlled structure,the mean values of their yield load increase value and ultimate load increase value are 27. 4% and 22. 4%,respectively;meanwhile,the displacement ductility and the energy-dissipating ability of two controlled structures are superior to those of the non-controlled one. Compared with the non-controlled structure,the equivalent viscous damping coefficient of two controlled structures is improved by 27. 3% ~ 30. 8%; so,the aseismic performance of the controlled structures is superior to that of the non-controlled one.