Research On Seismic Behavior Of Abnormal SRC Exterior Joints In Conventional Island Of Nuclear Power Plants

As a kind of effective and clean energy,nuclear power can partly solve the problem of power shortage,and can reduce environmental pollution produced by thermal power.Due to the production requirement,the plants inevitably appear abnormal SRC exterior joints,which will have an effect on the seismic performance of the structure.So experimental study and theoretical analysis is of great significance to ensure the safe operation of nuclear power plant facilities.Based on the research of CAP1400 steel reinforced concrete power plants,three representative abnormal exterior joints of variable column cross section and one regular joint of same column cross section are choosed and low reversed cyclic loading tests are carried out to study the failure patterns,the strain of each element,Hysteretic properties,bearing capacity,ductility and energy dissipation,stiffness degradation performance.The results show that,The bearing capacity,ductility,energy dissipation and stiffness of abnormal joints is relatively smaller than the regular ones.Increasing the height of beam section can improve the bearing capacity,ductility,energy dissipation and stiffness of the abnormal SRC exterior joints to same extent.Compared with steel reinforced concrete column-steel reinforced concrete beam joints,the seismic performance of the steel reinforced concrete column-reinforced concrete beam is poor.Finite element analysis software ABAQUS is used to calculate the specimens in this test and the results is in good agree with the test.Then the influence law of the seismic performance of the abnormal SRC exterior joints with variable column cross section is obtained under different strength grade of concrete,axial compression ratio,the thickness of the steel web and the height of column section above.Based on the results of experimental study and finite element analysis and as the minor core area for the calculating unit,the shear resistance formula of abnormal SRC exterior joints with variable column cross section are proposed in consideration of variational column section above.The structural measures and design suggestions of abnormal SRC exterior joints is given out.