Two-mode based estimation of equivalent seismic loads and static estimation of dynamic response of reticular domes supported by ductile substructures
Two-mode based estimation of equivalent seismic loads and static estimation of dynamic response of reticular domes supported by ductile substructures
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发表时间：
2006
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通讯作者：
S. Kato;S. Nakazawa;Keita Saito
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作者：
S. Kato;S. Nakazawa;Keita Saito
基于两种主要振型，本文讨论了一种估算由延性下部结构支承的钢网壳在地震作用下的等效静力地震荷载的方法，然后将估算的荷载应用于静力非线性分析，以估算钢网壳的最大响应。所提出的方案是基于一种等效线性化的方法来假设静态地震荷载取决于输入地震运动的强度。首先，两种类型的等效静态地震荷载，都随着地震烈度的变化，估计的假设下，子结构屈服于规定的基础剪力：一个地震力主要代表的水平摇摆运动的影响和其他主要代表的上下运动由于反对称模式刺激水平地震运动。其次，建议的两种类型的负载施加到钢网状穹顶的成员尺寸配比，然后估计在严重的地震运动下的非线性动力响应。第三，通过将基于所提出的地震荷载的静力非线性分析的结果与基于时程动力分析的结果进行比较，证明了所提出的两种地震荷载的有效性和准确性。最后，本方案的扩展建议进一步应用于基于性能的设计。
Based on two predominant modes, the present study discusses a scheme to estimate equivalent static seismic loads for a steel reticular dome supported by a ductile substructure subjected to earthquake motions, followed by an application of the estimated loads to static nonlinear analysis to estimate maximum responses of the reticular dome. The proposed scheme is based on a kind of equivalent linearization method for assuming static seismic loads depending on the intensities of input earthquake motions. First, two types of equivalent static seismic loads, both changing with seismic intensity, are estimated under the assumption that the substructure yields under a prescribed base shear force: one seismic force represents mainly the effects of horizontal sway motions and the other represents mainly those of up-and-down motions due to an anti-symmetric mode stimulated by horizontal earthquake motions. Second, the proposed two types of loads are applied for proportioning the member sizes of a steel reticular dome, followed by estimation of nonlinear dynamic responses under severe earthquake motions. Third, the efficiency and accuracy of the proposed two types of seismic loads are proved through comparison between the results based on a static nonlinear analysis using the proposed seimic loads and those by time history dynamic analysis. Finally, an extension of the present scheme is suggested for further application in performance based design.