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援莫桑比克国家体育场屋盖为典型的钢结构大跨度悬挑屋盖,风荷载为其结构设计的主要控制荷载.通过刚性模型表面测压风洞试验,得到了体育场屋盖的风压时程,并以此为基础,计算了屋盖表面各测点的风荷载相干函数,分析了屋盖结构不同区域测点之间表面风荷载相干函数的变化规律.另外,利用结构有限元模型,使用频域方法计算得到了结构的位移与内力均方根响应,分析了屋盖表面风荷载相干函数对风致位移和内力响应的影响以及振型数量和振型交叉项对屋盖风致位移和内力响应的贡献.结果分析表明,在进行结构风致响应计算时,不考虑各测点之间的相干函数,会低估结构的风振响应,不考虑结构振型交叉项的影响,也会导致计算结果较大的误差.
Supporting Mozambique National Stadium roof is a typical steel structure long-span cantilevered roof, the wind load is the main control load of its structural design.The wind pressure history of stadium roof is obtained through the wind tunnel test of rigid model surface pressure, Based on this, the coherence function of wind load at each measuring point on the roof surface is calculated, and the variation law of coherence function of surface wind load between different measuring points of roof structure is analyzed. In addition, by using the structural finite element model, Domain method to calculate the root mean square root of the displacement and internal force response of the roof. The effect of coherence function of roof surface wind load on wind-induced displacement and internal force response is analyzed. The effect of the number of vibration modes and the cross terms of vibration mode on wind-induced displacement and internal force response of roof Contribution.Results of the analysis show that in the calculation of the wind-induced response, the wind-induced response of the structure is underestimated irrespective of the coherence function between the measuring points and the result of the calculation is not large The error.