大跨度柔性屋面建筑风振响应研究——突然开孔时的内压及屋面响应研究  

Study of wind-induced dynamic response of long-span flexible roof structures:Internal pressure and roof response in the case of sudden opening

作　　者：布占宇[1] 楼文娟[1] 唐锦春[1] 徐兴[1] 

机构地区：[1]浙江大学土木工程学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2004年第1期74-78,92,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(59978044).

摘　　要：研究了大跨度柔性屋面建筑在台风中门窗破坏产生突然开孔,风从开孔涌入引起的内压以及屋面响应问题.假定建筑物体积变化与内压成线性关系,推导了突然开孔时内压以及屋面响应的理论公式,并进行了大跨度平屋面气动弹性模型风洞试验.理论分析结果与试验结果符合较好,说明理论分析有足够的精度.研究结果表明,大跨度柔性屋面建筑突然开孔时有内压突然增大的现象,屋面呈现两个共振频率,屋面柔度能够增大系统阻尼,降低屋面响应,风速以及开孔面积增大时能增大屋面响应.The dynamics of internal pressure to sudden opening and the responses of flexible roof structure under interaction of internal pressure and external pressure were concerned. Based on the assumption of linear relations between building volume and internal pressure, analytical formula for calculating transient internal pressure and roof dynamic response in the case of sudden opening were derived. The aeroelastic model wind tunnel test of the building with flat roof was carried out. Experimental results from sudden opening tests were used to check the validity of the present method. The results of analytic method agree with the test ones. It shows that when a sudden opening is created, the transient internal pressure exhibits initial overshoot phenomenon, roof has two resonance frequencies, the roof flexibility can increase system damping and decrease roof response, large wind velocity or opening area can increase roof response.

关 键 词：大跨度柔性屋面建筑 风振响应 风荷载 突然开孔 赫姆霍茨共振 内压 

分 类 号：TU231[建筑科学—建筑设计及理论] TU312.1