| As the steel-concrete-steel(SCS)sandwich wall is mainly used for load-bearing structure and protective structure,considering the frequency of daily accidents and terrorist attacks,its anti blast and anti impact performance is required.In this paper,the drop weight impact test is carried out for the composite wall of double steel plate concrete with J-hook connector.The damage and dynamic response of SCS wall under impact load and explosion load are simulated by using the finite element software LSDYNA.The main research work and achievements are as follows:(1)The drop weight impact tests of 10 SCS composite wall members with J-hook connectors were carried out.The research parameters include: impact energy,thickness of steel plate,distance between J-hook connectors and whether there is end column or not.It is found that whether the end column is available or not and the thickness of steel plate have a great influence on the impact resistance of the specimen.(2)The rationality and reliability of the finite element model,material constitutive model and contact algorithm are verified by comparing the results of LS-DYNA numerical simulation and impact test.In addition,numerical simulation is carried out under the condition of axial pressure limited by test means and test conditions.(3)Through the finite element simulation,the anti explosion performance of the composite wall under different parameters is studied.The parameters include: explosive equivalent,thickness of the outer steel plate,distance between J-hook connectors,whether there is end column,explosion distance,constraint conditions and axial compression ratio.It is found that the axial compression has a great influence on the anti explosion performance of composite wall.(4)The multi-scale simplified model of 15 story shear wall structure with total height of 63 m is established by LS-DYNA software.The failure and dynamic response of SCS wall under different explosion loads are studied.The anti explosion performance of reinforced concrete structure and SCS structure is compared. |
