| 邹德高,隋翊,周扬,孔宪京,刘鑫,龚涛.核电厂桥梁结构-地基动力相互作用精细化分析[J].,2018,58(4):407-413 |
| 核电厂桥梁结构-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 |
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| DOI：10.7511/dllgxb201804011 |
| 中文关键词:桩土效应核安全相关桥梁精细化模型波动输入方法地震响应 |
| 英文关键词:pile-soil effectnuclear safety relatedbridgerefined modelwave input methodseismic 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: |
| 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．厂内道桥承担着应急撤离和救援的重要功能，其地震安全十分重要．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动弯矩的影响．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输入方法小24%～34%．因此，在开展核电厂重要桥梁结构抗震安全评价时，进行桥梁结构-地基动力相互作用精细化分析是十分必要的． |
| 英文摘要: |
| An emergency bridge is planned to build in a nuclear power plant, which is the first time in China′s nuclear sector. The bridge of nuclear power plant has important function of emergency evacuation and rescue, so its seismic security is very important. The traditional soil springs model by m-method and soil-bridge structure solid element refined model are established respectively, and the influence of foundation model and earthquake motion input method on dynamic bending moment of bridge pier is researched. The results indicate that dynamic bending moment of soil springs model is 15%-20% lower than that of refined model under operation-safe ground motion. Meanwhile, significant difference of 20%-30% on dynamic bending moment is observed under ultimate-safe ground motion. Wave input method considers radiation damping and traveling wave effect of the foundation, and the obtained dynamic bending moment is 24%-34% lower than that calculated by the uniform excitation method. Therefore, it is necessary to take refined dynamic interaction analysis of soil-bridge structure in seismic safety evaluation of important bridge structure in nuclear power plant. |
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