Study on the form and mechanism of continuous wind uplift of large‑span terminal roof under typhoon

The wind uncovering effect of the roof of a large-span terminal building is one of the important factors affecting its struc? tural safety. Existing studies only consider the benign wind climate and static wind load effects， which are difficult to explain the re? al wind uncovering pattern and occurrence mechanism of the roof structure under the strong typhoon dynamic load. Based on WRF， CFD and LS/DYNA， this paper carries out the numerical simulation of continuous wind damage of a large-span terminal building under the action of typhoon. The wind field simulation of typhoon "Hegeby" was carried out firstly. The continuous wind uncovering process of the terminal roof under the typhoon was simulated by taking an international airport terminal building as an example， and the wind damage pattern and wind damage rate of the roof cover under different wind angles were compared and ana? lyzed to reveal the wind damage mechanism of the large-span terminal building under the typhoon. The results show that the ex? treme wind pressure at the windward edge of the terminal roof is higher， and the effect of upward and downward pressure is obvi? ous， and the maximum pressure difference coefficient is 12.41. When the critical wind speed is reached， the windward edge of the roof is partially lifted by the wind， and then the "chain effect" triggers the continuous wind damage of the roof， and the tearing direc? tion of the roof is consistent with the incoming flow direction. The energy failure index K is given based on the law of internal ener? gy change before and after the failure of roof units， which can be used to guide the design of large-span terminal building roofs against wind uncovering.