Numerical Simulation and Experimental Study on Damage Effect of Prestressed T-shaped Beam under Blast Load
The damage effect of prestressed T-shaped beam under blast load is studied.A 1∶3 complex steel-concrete structure finite element model of prestressed T-shaped beam is established by using nonlinear finite element software.The mesh size matching and coordination between reinforced beam elements and solid concrete elements are designed,along with the coupling among the prestressed steel strand,beam rib reinforcement,edge plate reinforcement and cross-beam reinforcement.Then cooling prestressed contraction method are used to flexibly control the accurate loading of value transfer between prestressed and T-shaped beam elements.The finite element simulation results are compered with the experimental results.The comparison result indicates that the numericial simulation and experimental damage situations are basically consistent,and at the same position,the relative error between the simulated value of shock wave overpressure and the test value is less than 20%,which verifies the effectiveness of the numerical simulation model.It can provide the simulation methods and data support for the vulnerability analysis and explosion resistance design of subsequent steel-concrete frame structures.
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