Dynamic response of steel structure protective door under long-duration blast wave
To study the dynamic response behavior of a steel structure protective door under the action of long-duration explosion shock wave,four explosion tests with different doses are carried out on the prototype beam-slab steel structure protective door by using a self-developed explosion wave simulation device,and the relationship between the characteristic parameters of the shock wave and the dynamic response of the protective door is analyzed.On this basis,a finite element model is established by LS-DYNA software,and the response characteristics of the protective door under long-duration explosion load and the anti-explosion performances of the protective door under different door plate thickness combinations are studied.The results show that the positive pressure duration of the shock wave generated by the explosion wave simulation device can reach 319 ms under the experimental conditions.The shock wave presents the waveform characteristics of continuous oscillation in the quasi-static pressure stage.At this stage,the explosion impulse increases rapidly,and the quasi-static pressure and impulse generated by the explosion are positively correlated with the amount of explosive.Under the action of long-duration blast wave,the protective door continues to vibrate,and the time of complete response increases significantly.The deformation mode of the protective door under the test charge is approximately elastic deformation.Under the premise of keeping the total thickness of the door plate of the protective door unchanged,the deformation of the protective door can be effectively reduced by increasing the thickness of the panel and reducing the thickness of the corresponding back plate,which provides a reference for the design and optimization of the steel structure protective door against long-duration blast waves.
万方数据
维普
