摘要
针对轻型屋面结构的抗风敏感性问题,采用风洞测振试验研究复合屋面板钢构体系的风振特性.在低湍流度均匀流场中,对某复合屋面板钢构体系在两种典型风攻角、4种典型风偏角和9个不同风速下的屋面板中间两个测点的风致位移响应进行测试,对动态位移时程、位移统计结果、位移响应谱和位移风振系数进行了分析.研究结果表明,在低湍流度均匀流场中,屋面板钢构体系的平均位移和均方根位移随风速增加而增大,风攻角和风偏角对屋面风振响应影响很大,最不利风向角下的位移风振系数为1.1～1.4.特征紊流是导致不同风攻角及风偏角屋面板位移均方根响应差异的主要因素,在设计中应重点关注屋面周边局部区域.
In connection with wind sensitive issues for light roof structures,wind tunnel test is conducted for the wind-inducted vibration characteristics of composite roof steel structure system.In low turbulence uniform flow field,wind-induced displacement responses of a certain series of composite roof steel structure system are tested under two typical wind angles of attack,four typical wind declinations and nine different wind speeds.The dynamic displacement time histories,displacement statistics,displacement response spectra and displacement wind load factors are analyzed.The results show that the average displacement and root mean square displacement of the roof system increase with wind speed increases in the low turbulence uniform flow,and the influence is great of the wind angle of attack and wind declination on the wind induced response to roof.On the most unfavorable wind angles,the displacement wind load factor is from 1.1to 1.4.Turbulence characteristics is the main factor that lead to the root-mean-square displacement response differences for different wind angles of attack and wind declinations,and it should be focused on in the design especially for the local area surrounding roof.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2014年第1期77-82,191,共6页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(50908208)
关键词
风洞试验
风振特性
位移响应
复合屋面板
wind tunnel test
wind-induced vibration characteristic
displacement response
composite roof steel structure
