高层住宅建筑风荷载特性及风致响应

Wind Load Characteristics and Wind-induced Response of Tall Residential Buildings

对某复杂体型高层住宅建筑进行了实际工况和三种不同高宽比单体工况下的刚性模型测压风洞试验,通过数据整理计算得到各工况下结构的轴向整体风力系数、加速度和位移响应值,进而研究了周边建筑干扰和高宽比变化对结构的风荷载及风致响应的影响。结果表明:干扰使得结构整体风力系数偏小,高宽比变化对整体风力系数的影响基本可以忽略,但由于结构体型复杂,值达1.52,超出规范对类似矩形结构建议值;干扰使得结构响应沿风向角变化较大,随着高宽比的增大加速度和位移响应增大,加速度响应主要体现在横风向,位移响应主要体现在顺风向;单体结构的风荷载与风致响应最不利风向角不一定为来流沿两个主轴的风向角,进行抗风设计时应注意与类似单体矩形结构的这种区别。

In order to study wind load characteristics and wind-induced response of tall residential buildings,a wind tunnel test of rigid model was carried out for a tall residential building of complex type under actual condition and three monomer conditions of different aspect ratios, then the axial overall wind force coefficient,acceleration and displacement response of the structure under different working conditions were calculated by data processing to further study the influence on the wind load and wind-induced response of the structure caused by the interference of the surrounding buildings and the different aspect ratios. The results show that the interference effect makes overall wind force coefficient of the structure smaller than that of the single structure,the influence of aspect ratios on the overall wind force coefficient of the structure is so small that it can be neglected. But because of the complexity of the structure,the value reaches 1.52, which exceeds the standard value of similar rectangular structure; the interference effect makes the structural response change greatly along the wind direction,as the aspect ratio increases,the acceleration and displacement responses increase. The acceleration response is mainly reflected in cross-wind direction,while the displacement response is main-ly reflected in along-wind direction; the worst wind direction angle of the wind load and wind-induced response of the monomer structure are not always the direction of the two main axes of the inflow,such differences should be noted in the wind resistant design with similar rectangular structures.