Study On The Deformation And Seismic Performance Of AP1000 Structure Model Wall Using Layered Pouring Concrete Technics

As energy demands continue to surge and urgent need for energy structure adjustment,nuclear energy has won increasingly broad attention.The studies on the nuclear power engineering and relative hot issues are also imperative.In China,AP1000(the third generation nuclear power reactors)structural module wall,adopts double-plated concrete structure.The study of this kind of structure are mostly concentrated on the steel-concrete composite shear wall of the civil building.The research related to nuclear power engineering is still at an early stage,and lack code for seismic design of buildings.The transportation and hoisting loads of the modules are mainly considered in the design of supporting system of structural module,while little thought for lateral pressure in concrete casting,cause the deformation of modules becomes a critical technical issues.In view of the problems existing in the research and application of above-mentioned steel plate concrete structures of nuclear power engineering,this paper is mainly focused on the following researching work.Firstly,design the mix proportion of self-compacting concrete used for AP1000 structural module wall by orthogonal test.Analyze the compressive strength,splitting tensile strength and collapse extension of concrete,then obtain the mix ratio make self-compacting concrete with good mechanical properties and working performance.Secondly,make typical unit test model of the corresponding wall module and obtain relationship between the lateral pressure and the height of concrete and analyze deformation and strain of the wall through layered casting test.The research indicates that,in the process of layered casting,lateral pressure of self-compacting concrete changes linearly along the height;lateral pressure decreases gradually from bottom to top;the maximum lateral pressure,which the hydraulic value is 50%-80% according to hydraulic formula,appears at the bottom of the current layer,and the lateral pressure of preconsolidated concrete decrease.According to the lateral pressure distribution rule determined by the test,and the numerical simulation of the test model is carried out by using the finite element software ABAQUS,and the simulation results correspond well with the test results;two kinds of actual wall models are established,and the numerical simulation of two kinds of wall models with different casting heights are carried out,and the reasonable monolayer casting height is determined to be 5 meters.According to the simulation results,the critical control conditions,the stress of channel steel and the deformation of steel plate,are determined,and their calculation formulas are deduced at the same time.On this basis,analyze the critical design parameters of the structural module wall.The results show that the actual engineering design is conservative and the distance between angle steel and channel steel can be increased slightly in order to improve construction efficiency and save cost.The research of this paper can provide reference for the design and construction of nuclear power engineering.Ten kinds of structural module walls with different parameters were designed,and the influence of steel plate thickness,angle steel spacing and channel steel spacing on seismic performance was studied by using finite element software ABAQUS.The bearing capacity,rigidity and energy dissipation capacity of these walls are studied by hysteretic curve and skeleton curve.On this basis,the calculation model of rigidity of wall is simplified.The calculation formula of initial rigidity is putting forward to provide theoretical support for seismic design of nuclear power related steel-plated concrete structures.The research results in this paper are of great significance to the development of nuclear power engineering in China.