Tornado‐induced vibration assessment of construction elevator attached to high‐rise buildings

Zheng He, Maoxing Gao, Tian Liang, Xiao Lai, Yi Lu, Feng Pan
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Abstract

SummaryAs one of major construction facilities, the safety concern about elevator outer‐attached to slender high‐rise buildings during construction needs to be seriously addressed. To specifically identify the risk of such slender building–elevator systems in extreme tornado wind field, a safety assessment strategy using the critical velocity envelope is systematically developed. To overcome the difficulties in modeling such building–elevator system, a modified generalized flexural‐shear model developed previously was employed to reach an efficient estimate on the response of a case high‐rise building under simulated tornado wind excitations. To account for the effect of the flexibility of high‐rise building on the response of its attached construction elevator, the response of the elevator was obtained by finite element analysis with applied wind forces, as well as the displacement excitations at its supports with the building. To simulate the typical failure modes of elevator in all states, some critical reference velocity‐based envelopes were generated for the safety assessment where the factors of wind velocity, wind direction, and cage level are systematically addressed. The safety envelopes of the building–elevator system were proved to be instinctively efficient for the assessment of its wind resistance under various scenarios.
高层建筑施工电梯龙卷风引起的振动评估
摘要 作为主要建筑设施之一,细长型高层建筑外附着电梯在施工过程中的安全问题亟待解决。为了具体识别此类细长建筑-电梯系统在极端龙卷风风场中的风险,系统地开发了一种使用临界速度包络的安全评估策略。为了克服此类建筑-电梯系统建模的困难,采用了之前开发的改进型广义挠曲-剪切模型,对案例中的高层建筑在模拟龙卷风风激励下的响应进行了有效估算。为了考虑高层建筑的柔性对其附属建筑电梯响应的影响,通过有限元分析获得了电梯在风力作用下的响应,以及电梯与建筑之间支撑处的位移激励。为了模拟电梯在所有状态下的典型失效模式,生成了一些基于临界参考风速的安全评估包络,其中系统地考虑了风速、风向和笼层等因素。事实证明,建筑-电梯系统的安全围护结构在评估各种情况下的抗风能力时非常有效。
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