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对郑州绿地中央广场双塔楼的风荷载及风振舒适度进行了分析和评估。由于塔楼平面接近方形,且塔楼超高,属于风振敏感性建筑,设计中横风向风荷载不可忽略。两塔楼高度接近,且水平位置相距较近,将使得风场互相产生干扰,因此宜考虑群体效应可能产生的风荷载放大。顺风向与横风向风荷载的组合,应该考虑二者的相关性折减后进行矢量叠加。综合考虑群体效应与荷载折减后计算得到的结构基底剪力和基底弯矩与风洞试验得到的结果基本相当,可见该方法在超高层结构的风荷载计算方面具有的一定的适用性。风振舒适度的研究结果表明,该建筑的风振加速度满足要求,且根据现有规范计算得到的响应略小于风洞试验结果。
This paper analyzes and evaluates the wind load and wind-induced comfort of twin towers of Zhengzhou Greenland Central Plaza. As the tower plane near the square, and the tower is ultra-high, belongs to the wind-induced vibration of the building, the design of wind load can not be ignored. Due to the closeness of the two towers and their close horizontal positions, the wind farms will interfere with each other. Therefore, it is advisable to consider the wind load amplification that may result from the crowd effect. The combination of downwind and crosswind wind loads should consider the reduction of the correlation between the two and vector overlay. Taking the group effect and the load reduction into consideration, the calculated results of the base shear and the base moment are basically the same as those obtained by the wind tunnel test. It can be seen that this method has some applicability in the wind load calculation of the super high-rise structure. The results of wind-induced comfort show that the wind-induced acceleration of the building meets the requirements and the response calculated according to the existing codes is slightly less than that of the wind tunnel test.