火电厂主厂房结构异型节点抗震性能试验研究

Experimental study on seismic behavior of abnormal joints of main building in thermal power plant

为掌握火电厂新型主厂房框排架结构中异型节点的抗震性能,对由两侧梁高不等、柱截面突变及错层引起的异型节点进行了6个1/5比例试件拟静力试验研究及含有该类节点的空间结构试验研究。研究了节点的受力破坏模式、滞回耗能性能、强度和刚度退化规律及承载力计算方法。结果表明:该类节点初裂与极限荷载较常规节点显著降低,易发生小核心剪切破坏和柱端压弯剪复合破坏;异型节点中剪力墙的设置可以有效改善节点的抗震性能,提高其延性和耗能能力;通过分析节点受力机理并根据不同的破坏形态,提出针对SRC异型节点的承载力计算方法,为该类节点的实际设计提供参考。

In order to master the seismic performance of abnormal joints of the new main buildings in thermal power plant, pseudo-static tests on six 1/5-scaleed specimens of abnormal joints caused by highly variable of beams, column section mutations and split-level structure have been performed as well as the spatial model test. The study was focused on the failure mode, hysteretic behavior and energy dissipation capability, strength and stiffness degradation law and bearing capacity calculation method. The experimental results show that the cracking load and the ultimate load of irregular joints obviously decrease when compared with regular joints, two typical failure modes mayoccur simultaneously, namely, they are the small core shear failure and column compression-bending-shear combined failure. The shear walls set in the joints can effectively improve the seismic performance and energy dissipation capacity. The calculation method of SRC irregular joints for different failure patterns is proposed. It can provide reference for engineering design.