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| 核电安全相关的桥梁结构-地基动力相互作用精细化分析 |
| Refined dynamic interaction analysis of soil-bridge structure of nuclear power plants |
| 投稿时间：2017-12-19 修订日期：2018-01-16 |
| DOI： |
| 中文关键词: 关 键 词：桩土效应 核安全相关 桥梁 精细化 波动输入 地震响应 |
| 英文关键词: pile-soil effect Nuclear Safety Related bridge refined model wave input model seismic response |
| 基金项目:地震行业科研专项经费项目(201208013) |
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| 中文摘要: |
| 我国某核电厂拟建厂内应急通道桥,这在中国核电领域尚属首次。厂内道桥承担着电厂在事故工况下应急撤离和救援的重要功能,其地震安全十分重要。本文分别建立了传统的土弹簧模型(“m法”)和桥梁结构-地基实体单元精细化模型,研究了地基模型以及地震动输入方法对桥墩柱弯矩的影响。结果表明：在运行安全地震动工况下,土弹簧模型计算的桥墩柱动弯矩比精细化模型小15%～20%；当极限安全地震动时,两者动力响应差距显著增加,达到20%～30%。波动输入方法考虑了地基的辐射阻尼和行波效应,计算的桥墩柱动弯矩比传统的一致性输入小24%～34%。因此,在开展核电厂重要的桥梁结构抗震安全评价时,桥梁结构-地基动力相互作用精细化分析是十分必要的。 |
| 英文摘要: |
| This is the first time to plan to build an emergency bridge of nuclear power plants in domestic. The bridge of nuclear power plants has important function of emergency evacuation and rescue, accordingly has significant evaluation of seismic security. In this paper, the foundation soil is simulated by soil springs by m-method on the piles and used solid element refined model respectively, meanwhile, the influence of foundation model and earthquake motion input method on dynamic bending moment is researched. The response indicates that, dynamic bending moment on soil springs models is 15%～20% lower than refined model under operation-safe ground motion. Meanwhile, significantly more differences 20%～30% were observed when reach the ultimate safety earthquake. Compared with the uniform excitation model that adopt inertial force input method, wave input model consider radiation damping and traveling wave effect of foundation, the dynamic bending moment is 24%～34% lower than uniform excitation model. Therefore, it is necessary to take refined analysis of dynamic soil-bridge structure interaction of nuclear power plants. |
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