混凝土管柱排架与小直径管柱防屈曲支撑减震排架抗震性能试验研究

为解决传统空冷凝汽器支架结构抗侧能力弱，抗震能力不足的问题，设计制作了两榀空冷支架结构排架试件，其中一榀为常规直径混凝土双管柱结构试件，另一榀为直径较小的双管柱且增设多段连接防屈曲支撑的结构试件。分别对两榀排架结构试件进行了往复加载试验，对比分析了两榀排架的抗震性能，包括混凝土管柱的开裂与裂缝发展、荷载-排架顶点侧移滞回曲线、刚度退化、骨架曲线等，研究设置于双管柱之间的单斜式防屈曲支撑的轴力 轴向变形滞回曲线的特点及其提高结构抗震性能的工作机制。研究结果表明，多段连接防屈曲支撑可在层间位移角约1/750时进入屈服耗能状态，在层间位移角约1/30之前不失效，可显著增加结构阻尼且耗能稳定，提高了结构抗震性能。

Experimental study on seismic behavior of concrete pipe column shelf and minor diameter pipe column BRB shock absorbing shelf

In order to solve the problems of weak lateral resistance and inadequate seismic defense of traditional air condenser bracket structures，two air-cooled bent frame specimens were designed and manufactured. One was consisting of two concrete pipe columns with conventional diameter, the other was consisting of two pipe columns with minor diameter and a multi-segment-connected buckling-restrained brace (BRB). The seismic tests of two bent structures under cyclic loading were carried out, and the seismic performance was compared and analyzed, including the cracking state and its development process of pipe columns, horizontal force-lateral displacement hysteresis curves, stiffness degradation, skeleton curves and so on. The characteristics of the axial force and deformation hysteresis curves of the single diagonal BRB and the working mechanism improving the seismic performance were studied. The tests prove that the BRB starts yielding to dissipate seismic energy when the lateral displacement angle is about 1/750, and it does not fail until the angle reaches about 1/30, which increases the structural damping and stablizes the energy dissipation, the earthquake resistant capability is increased significantly.