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采用SAP2000软件建立了某景观烟囱的结构分析模型,输入风荷载时程进行风振响应分析。考虑了烟囱复杂外形和不规则质量分布,利用频域方法计算了烟囱第1阶振型的风振位移响应,并与时域方法的结果进行对比,二者吻合较好。分别采用阵风荷载因子法和惯性风荷载法计算了烟囱结构不同高度处的风振系数,并将基于该两种风振系数的等效静力风荷载分别作用在烟囱结构上,计算其顺风向位移响应并与精确值进行比较,结果表明其位移分布均符合真实响应。因此虽然上述两种方法得到的风振系数沿高度分布差别较大,但均能实现烟囱的风振位移等效,均是合理的。为工程应用方便,采用基于阵风荷载因子法的风振系数供结构设计使用。
The structural analysis model of a landscape chimney was set up by using SAP2000 software. The wind-induced vibration response was analyzed when wind load history was input. Considering the complex shape and irregular mass distribution of the chimney, the wind-induced vibrational displacement response of the first order mode of the chimney was calculated by using the frequency domain method, which was in good agreement with the time-domain method. The wind-induced vibration coefficients at different heights of the chimney structure are calculated by using the gust load factor method and the inertial wind-load method, respectively, and the equivalent static wind loads based on the two wind-vibration coefficients are respectively applied on the chimney structure to calculate the windward direction Displacement response and comparison with the exact value, the results show that the displacement distribution are in line with the true response. Therefore, although the wind-induced vibration coefficients obtained by the above two methods are greatly different along the height distribution, it is reasonable to realize the wind-induced vibration displacement equivalent of the chimney. For the convenience of engineering application, wind-induced vibration coefficient based on gust load factor method is adopted for structural design.