作　　者： ; ;

机构地区： 同济大学土木工程学院土木工程防灾国家重点实验室

出　　处： 《建筑结构》 2015年第2期63-69,共7页

摘　　要： 在闭口回流式风洞TJ-2中分别对阻塞度为4.1%,6.1%,8.4%,10.1%的单体高层建筑刚性模型进行了测压试验,根据风洞试验结果,选取3种典型结构进行响应计算,以研究阻塞效应对不同结构风致响应的影响。对结构顶部位移和加速度、基底剪力、等效静力风荷载进行了细致分析。结果表明:各结构顺风向顶部位移和基底剪力平均值的阻塞效应较为接近,但顺风向、横风向顶部位移、加速度和基底剪力均方根的阻塞效应较为显著,且差别较大。随着阻塞度的增大,结构质量越轻、刚度越柔,横风向顶部位移、加速度和基底剪力的均方根的阻塞效应均有所降低。各结构顺风向等效静力风荷载峰值在顶部和底部处的阻塞效应较为明显。结构质量越轻,刚度越柔,建筑顶部附近的顺风向等效静力风荷载峰值的阻塞效应增强,而横风向等效静力风荷载峰值的阻塞效应减弱。 Pressure measurement tests of single high-rise building rigid model whose blockage ratios were 4. 1%,6. 1%,8. 4% and 10. 1% were respectively carried out in the closed circuit wind tunnel of TJ-2. Based on the test results,windinduced responses of three typical structures were calculated to study blockage effects. Displacement and acceleration on the top,base shear force and the equivalent static wind load were analyzed in detail. Results show that blockage effects on mean values of top displacement and base shear force of three kinds of structure in the along wind direction are similar,but those on root-mean-square of top displacement,acceleration and base shear force in both along and across wind directions are more conspicuous and their differences among three kinds of structure are significant. With the increase of blockage ratio,blockage effects on root-mean-square of top displacement,acceleration and base shear force in the across wind direction are less severe when the structure is lighter and more flexible. The peak of equivalent static wind load near the top and base of the all three typical structures in the along wind direction have obvious blockage effects. If the structure is lighter and more flexible,the blockage effects are more severe on the peak of equivalent static wind load near the top in the along wind direction and are weaker in the across wind direction.

关 键 词： 风洞试验 高层建筑 阻塞效应 风致响应

领　　域： [建筑科学]