Structural performance of single-layer reticulated domes under blast loading

摘要

The dynamic performance of single-layer reticulated domes under explosions was analysed experimentally and numerically in this study. The loading was generated by a Gas Blast Shock loading system (GBS) by igniting a gaseous mixture and applying it to the reduced-scale structure to investigate the dynamic response modes. Acetylene/air mixtures with various volumes were designed in different cases. The experimental data, including overpressure-time histories, strain-time histories, and permanent displacement at representative locations, were recorded. The response patterns of the specimens were identified and discussed, the five major failure modes are as follows: no damage mode, insignificant damage mode, moderate damage mode, heavy damage mode, and whole collapse mode. It was shown that the Gas Blast Shock loading system is feasible for studying the response modes of single-layer spherical reticulated shells under external explosion. In addition, a numerical model based on ANYSY/AUTODYN was developed to simulate the experimental tests, and an improved equivalent TNT method was used to simplify the loading system. Good agreement between the experimental and numerical results was achieved and an explosion efficiency factor was proposed.