某高层多塔连体结构风荷载体型系数研究

Research on Shape Coefficients of a High-Rise Multi-Tower Interconnected Structure Under Wind Load

以珠海某高层多塔连体结构工程为例,研究高位连接复杂多塔结构表面的风压特征与体型系数分布,为此类结构的抗风设计提供计算依据,保障结构安全。采用CFD方法对高层多塔连体结构及周围干扰建筑进行数值风洞模拟,分析不同风向角工况下结构主表面及局部构造处的体形系数,并与物理风洞试验结果以及规范值进行比较。结构迎风面的体型系数一般呈现中间大两边小的分布,多塔楼之间存在互相干扰作用;裙房处可能存在体型系数绝对值较大的情况,斜向气流在相邻表面易形成较大风压;相比于物理风洞试验结果,数值风洞模拟的结果与荷载规范值更为接近,且分布相对更为均匀;不规则高位连接体凹面处会产生较大的体型系数,但对整体结构的体型系数影响有限。在抗风设计过程中,多塔楼间的干扰作用及不规则高位连接体的影响应予以考虑。

Taking a high-rise multi-tower interconnected structure in Zhuhai as an example,the surface wind pressure characteristics and shape coefficient distribution of complex high-connected multi-tower structures were studied,which could provide the calculation basis for the wind-resistant design of such structures to ensure the structural safety.CFD method was used to conduct numerical wind tunnel simulation of the high-rise multi-tower interconnected structure and surrounding disturbed buildings.The shape coefficients of main surfaces and local structures under different wind direction angles were analyzed,and compared with the physical wind tunnel test results and standard values of the load code.The shape coefficients of windward side of the structure was generally large in the middle and small on both sides,and there was interaction between multiple towers.On the podium,the larger absolute value of shape coefficients might be exist,and the oblique flow was easy to form larger wind pressure on the adjacent surfaces.Compared with the physical wind tunnel test results,the numerical simulation results were closer to the values of the load code,and the distribution was relatively more uniform.The concave surface of the high-altitude irregular connector produced larger shape coefficients,however,the influence on the whole structure was limited.In the windresistant design process,the interference between multiple towers and the influence of high-altitude irregular connectors should be considered.