Dynamic response analysis of single-layer spherical reticulated shell structure under internal explosion of suitcase bomb
LI Dan1,2, LUO Zhiyuan1, XIA Qianwen1, DENG Yongjun1, 2
1.School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China;
2.Sichuan Provincial Key Lab of Shock and Vibration of Engineering Materials and Structures, Mianyang 621010, China
Abstract：Using ANSYS/LS-DYNA to establish a 40m Kiewitt K8 single-layer spherical reticulated shell, using the fluid-structure coupling algorithm, considering the most unfavorable intenal explosion type of reticulated shell and obtaining its dynamic response law. The results show that there are differences in the distribution of the flow field inside the shell, the propagation path of the shock wave, and the interaction process between the shock wave and the reticulated shell. in the horizontal position of different blasting points, therefore, the characteristic response varies greatly with the change of the horizontal position of the blast point, and the plastic strain percentage of the shell member reaches an extreme at approximately 3/4 of the half shell of the lattice shell;The plastic strain percentage of the ring rod is larger that of diagonal rod and ribs rod , The "ring rod effect" features with high frequency and high amplitude on the axial stress of the ring rod is related to the location , and is mainly located in the reciprocal 1-3 ring region of the reticulated shell; Under the explosion load, due to the local enhancement effect of the shock wave, the vulnerable parts of the shell structure mainly include the column foot, the rod member near the support, and the ring part of the net shell.
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