考虑幕墙开洞的大跨屋盖结构风荷载特性研究

Based on rigid model of wind-tunnel tests for a large-span roof structure with different curtain wall opening rates, influences of different curtain opening rates on wind load characteristics of large-span roof structure were studied. The results show that when there are sudden openings in windward curtain wall, the internal pressure time-history changes obviously, but there is little change when the openings locate in crosswind curtain wall. According to the power spectrum analysis of the internal pressure coefficient at the measuring point, the resonance frequency appears in the range of 30 ～ 40Hz. The internal pressure pulsation energy increases with the increase of the opening ratio of the windward curtain wall. The transient energy of the transient internal pressure suddenly attenuates when there are sudden openings. By comparing the test results of internal pressure coefficient and the stipulated values of load specifications both at home and abroad, it is found that the test values of internal pressure coefficient in a closed environment are all larger than those specified by domestic and foreign norms. The research results can be used for reference in the design of wind resistant large-span roof structures with curtain walls and the revision of the internal pressure of buildings with openings in load codes.