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对于高烈度区1000 MW机组火电厂,传统钢-混凝土混合结构空冷支架已经不能满足使用要求。在地震作用下,结构的悬挑端位移超限、局部杆件受力过大、结构整体侧移较大。对此,提出了加设斜撑的空冷钢-混凝土混合结构体系,并按1/8缩尺比例进行了该类结构的拟动力试验和拟静力试验。根据试验结果研究了模型结构在EL-Centro(N-S)地震波作用下的滞回性能、延性性能、刚度退化和耗能能力。试验结果表明:与传统钢-混凝土混合结构空冷支架相比,加设斜撑后,结构的耗能能力有较大的提高,刚度退化速度减慢,而且残余刚度较大,具有了更大的安全储备。研究为同类结构的抗震设计提供了试验依据,并能指导相关工程设计。
For 1000 MW unit thermal power plant in high intensity area, the traditional steel-concrete hybrid structure air-cooled bracket can not meet the requirements. Under the action of an earthquake, the displacement of the cantilever end of the structure exceeds the limit, the stress of the local bar is too large, and the overall lateral displacement of the structure is larger. In this connection, the air-cooled steel-concrete hybrid structure system with bracing is proposed and the quasi-dynamic test and quasi-static test of this kind of structure are carried out according to 1/8 scale scale. Based on the experimental results, the hysteretic behavior, ductility, stiffness degradation and energy dissipation of the model structure under EL-Centro (N-S) seismic wave are studied. The experimental results show that compared with the traditional steel-concrete hybrid air-cooled scaffolding, the energy dissipation capability of the structure is greatly increased, the stiffness degradation rate is slowed down and the residual stiffness is larger than the traditional steel-concrete hybrid air-cooling scaffold. Safety reserve. The research provides the experimental basis for the seismic design of similar structure and can guide the related engineering design.