External blast flow field evolution and response mechanism of single-layer reticulated dome structure

Single-layer reticulated dome structure are commonly high-profile building in the public and can be attractive targets for terrorist bombings, so the public can benefit from enhanced safety with a stronger understanding of the behavior of single-layer reticulated dome structure under explosion. This paper investigates the fluid-structure interaction process and the dynamic response performance of the single-layer reticulated dome under external blast load. Both experimental and numerical results shown that structural deformation is remarkably delayed compared with the velocity of blast wave, which advises the dynamic response of large-span reticulated dome structure has a negligible effect on the blast wave propagation under explosion. Four failure modes are identified by comparing the plastic development of each ring and the residual spatial geometric of the structure, i.e., minor vibration, local depression, severe damage, and overall collapse. The plastic deformation energy and the displacement potential energy of the structure are the main consumers of the blast energy. In addition, the stress performance of the vertex member and the deep plastic ratio of the whole structure can serve as qualitative indicators to distinguish different failure modes.