Experimental study on seismic performance of steel-concrete connection section of receiver tower of CSP station

Abstract

Taking the actual structure of the solarreceiver tower of a 243m high optical thermal power station as the prototype, and fully considering the influence range of structural quality and stiffness mutation, the 180-221m steel-concrete connection section structure is selected as the research object. The equivalent scale model is designed and manufactured according to the scale ratio of 1:8, and the quasi-static test under low cyclic reciprocating load is carried out. The failure characteristics, hysteretic performance, skeleton curve, stiffness and strength degradation, energy dissipation capacity, ductility and bearing capacity of the connection section structure are studied. The results show that the ultimate failure of the connection section structure is the overall bending yield of the upper steel frame and the local failure of the steel-concrete connection joint; The stiffness and strength of the connection section degenerate seriously when the structure is damaged. The equivalent viscous damping coefficient is 0.261 and the displacement ductility coefficient is 9.2, indicating that the specimen has good energy dissipation capacity and ductility under earthquake; The special joint structure can ensure the reliable connection between the upper steel frame and the lower concrete and meet the safety requirements.