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工程力学  2013 

基于钢塔架敏感性的连续倒塌分析与数值模拟

DOI: 10.6052/j.issn.1000-4750.2011.12.0885, PP. 322-330

Keywords: 钢塔架,连续倒塌,备用荷载路径设计法,关键杆件,敏感性,风荷载

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Abstract:

通过引入Pandey提出的敏感性指标,给出钢塔架关键杆件的识别方法。基于备用荷载路径设计法,对钢塔架结构在风荷载作用下的连续倒塌进行线弹性静力、非线性静力、线弹性动力、非线性动力等4种分析。结果表明:结构动力响应的大小取决于风荷载作用方向及关键杆件出现的位置;线弹性静力分析是偏于保守,非线性动力分析是更加精确的;建议采用非线性动力方法对钢塔架进行连续倒塌评估。通过失效杆件的等效反力卸载过程,模拟钢塔架连续倒塌的动力过程,提出了等效反力的初始持续时间t0(考虑初始状态)和卸载时间tp的计算方法。

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