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利用风洞试验结果,对矩形截面超高层建筑风致脉动扭矩数学模型进行研究。以厚宽比和风场类别为基本变量,采用最小二乘法得到了风致脉动扭矩系数根方差、功率谱密度、竖向相关性系数以及横风向基底弯矩-基底扭矩相干函数闭合计算公式。这些公式的计算结果与原始试验数据吻合较好,说明计算公式具有较高精度。此外,利用结构随机振动方法,用提出的公式以及直接采用试验风压数据计算一栋实际超高层建筑的扭转动力响应,对比了扭转广义力谱、顶层扭转响应谱以及扭转响应根方差等计算结果,对比结果表明两者吻合较好,从而验证了公式的适用性。
Based on the wind tunnel test results, the mathematical model of wind induced pulsation torque in rectangular section super high-rise buildings is studied. Based on aspect ratio and wind farm type, the root square error, power spectral density and vertical correlation coefficient of wind-induced pulsating torque coefficient were obtained by the least-squares method. The closed-form formulas of coherence function between base wind moment and base moment were obtained. The calculation results of these formulas are in good agreement with the original experimental data, indicating that the calculation formula has high accuracy. In addition, the torsional dynamic response of a real super tall building is calculated by the stochastic vibration method and the proposed formula and the experimental wind pressure data. Comparing the results of torsion generalized force spectrum, top torsional response spectrum and root variance of torsional response , The comparison results show that the two agree well, which verifies the applicability of the formula.