火电厂主厂房型钢混凝土混合结构异型中节点抗震性能试验研究

火电厂主厂房型钢混凝土混合结构中存在由于错层、变梁变柱截面引起的异型中节点，选取5个代表性节点进行1∶5缩尺拟静力试验，研究该类节点的滞回性能、耗能能力、延性、刚度退化以及承载能力。研究结果表明：受强梁弱柱特性的影响，4个型钢混凝土异型中节点主要发生不利于抗震的柱端塑性铰破坏，而钢筋混凝土异型中节点由于梁柱刚度比较大主要发生核心区剪切破坏；大小梁错层高度对型钢混凝土异型中节点的承载力、延性性能与刚度特性均有一定的影响，但规律并不明显；型钢混凝土柱-钢筋混凝土梁异型中节点的耗能能力强于钢筋混凝土异型中节点，但受破坏模式的影响，其承载能力、延性与刚度等均低于钢筋混凝土异型中节点；相比采用钢筋混凝土梁的型钢混凝土异型中节点，采用型钢混凝土梁的型钢混凝土异型中节点的开裂荷载高，初始刚度较大，但承载力、延性与耗能能力并未得到明显提高。

Experimental study on seismic performance of abnormal interiorjoints in steel reinforced concrete hybrid structure formain building in thermal power plants

Split-level, variable beams and columns in main building structure in the thermal power plants bring a large number of abnormal interior joints. The quasi-static test for five typical specimens in 1/5 scale of the prototype model were carried out, to study the hysteretic performance, energy dissipation capacity, ductility, stiffness characteristics and bearing capacity of this kind of abnormal joints. The results show that: the dominant failure mode is plastic hinges failure at column ends for four steel reinforced concrete abnormal interior joints which is not good for seismic resistance, while the failure mode mainly the shear damage in core area for the reinforced concrete abnormal interior joint because the beam-column stiffness ratio is quite large. The height of split-level which is caused by the large beam and small beam has certain influence on the bearing capacity, ductility capacity and stiffness characteristics of steel reinforced concrete abnormal interior joints, but the influence law is not obvious. The dissipation capacity of steel reinforced concrete column-reinforced concrete beam abnormal interior joints is better than the reinforced concrete abnormal interior joint. For the limitation of failure mode, however, the bearing capacity, ductility, stiffness characteristics of steel reinforced concrete column-reinforced concrete beam abnormal interior joints are lower than the reinforced concrete abnormal interior joints’. Compared with the steel reinforced concrete abnormal interior joint with reinforced concrete beams, the initial cracking bearing capacity of steel reinforced concrete abnormal joint with steel reinforced concrete beam is higher, and its stiffness characteristic is better, but its bearing capacity, ductility performance and energy dissipation do not enhance obviously.