Because cable-nets have enormous node numbers, it is not realistic to include all modes in calculation. With the modal analysis method,it is difficult to contain all significant contribution modes. It has been shown that some high order modes, which contribute to wind response significant, are likely to be overlooked because of their higher modal order. The wind-inducod vibration response of the cable-net roof was firstly analyzed with mode compensation in frequency domain method. Based on the Davenport spectrum, the frequency response function, the wind-induced vibration eigenvalue and the spectral density of generalized displacement response was computed in sequence. Finally, the wind-induced vibration coefficient of nodal displacement was proposed. The effectiveness of the method is verified through a numerical simulation of the wind response of cable-net stadium roofs with the developed%大跨索网结构节点数目庞大,在频域分析中不可能考虑结构全部振型,若考虑多阶振型的影响也难以包括所有主要贡献模态.结构往往存在对风振影响贡献较大的高阶振型,由于其频率高而容易被忽略.本文首次采用在频域内模态补偿法对索网罩蓬结构的风振响应进行模拟分析,克服了包含所有主要模态的困难.根据Davenport谱函数,计算结构传递函数、风激励特征值和广义位移响应谱密度,得出节点位移风振系数,并编制相关计算程序,通过索网罩蓬结构算列对本文采用方法的有效性进行了验证.
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