Dynamic response analysis and anti-shock performance of reticulated shell under impact

The key problems in impact response study of reticulated shell were specified,and the effective analysis method for impact response of reticulated shell was established.In the method,characteristic indices(load and characteristic response),analysis schedule for impact response and its calculation model were presented.Taking Kiewitt8 single-layer reticulated shell as an example,the impact response of reticulated shell was studied.Load characteristic,law of velocity and displacement changing for main joints,law of stress changing for main members and characteristic of energy changing for structure were mainly concerned.The results show that the load is a half sine pulse with short impact duration and high peak value.The local impact response increases abruptly when impact happens,then the impact response spreads to supports gradually.The local response of structure arrives at peak value from impact zone to supports successively.Moreover,time-history curves of velocity and energy may break due to the failure of impact zone.The result lays the foundation for study on reticulated shell against impact,and provides a reference to research on other large structures under impact.