A Study On The Mechanical Properties Of Shear Connector In Steel Plate Reinforced Concrete Structure For Nuclear Power Plants

One of the significant features of the third-generation passive nuclear power technology is the use of steel concrete(SC)modular construction techniques in nuclear island building.As a new type of structure,the third-generation passive nuclear power technology has a high bearing capacity,good ductility,excellent seismic performance and resistance to impact compared with the traditional reinforced concrete structures.In addition,the SC modular structures enable parallel activities on and off the construction site,and hence shortening construction times and improving economic efficiency.Because the engineering practice of SC structure is little,experimental research on the mechanical properties of shear connector of SC structure is not deep enough and GB standard is in the peer review stage.In this thesis,the mechanical property of shear connector in SC structures was studied through experimental study,numerical simulation and theoretical analysis.This study provides some research results for engineering design.The main contents of this thesis are as follows:(1)Seven groups of SC structures push-out test specimens were designed based on current SC wall arrangement to study the shear capacity,shear-slip performance and the workability of steel plate and concrete.(2)Experimental study on the mechanical property of shear connector in SC structures was carried out.Vertical load,displacement of concrete and relative displacement between concrete and concrete were measured,and the development of concrete cracks was tracked.The results found that when the shear plane was located at the roof of studs,failure mode was studs shear yielded and concrete partially crushed.When the shear plane was on the head of studs,the failure mode was concrete shear fracture near the head of studs,while the studs have not yet reached the ultimate shear capacity.(3)The nonlinear finite element model of studs group in SC structure was established,while static analysis was carried out.The results were compared with the experimental results,showing that the failure modes and load-displacement curves were matched better.The method used in this thesis can be applied to study the mechanical property of stud connector in SC structures.(4)A formula for ultimate shear capacity of shear connector in SC structures was proposed based on experimental results,which can be applied to a design of SC structures.