| 落石冲击能量对山区桥梁损伤的影响 |
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| 引用本文： | 顾乡,余志祥,赵雷,许浒.落石冲击能量对山区桥梁损伤的影响[J].西南交通大学学报,2016,29(6):1131-1137. |
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| 作者姓名： | 顾乡 余志祥 赵雷 许浒 |
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| 基金项目： | 国家自然科学基金资助项目（51408498，51408500）四川省交通厅科研资助项目（川交勘设-2011-035） |
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| 摘 要： | 为研究落石对桥梁冲击破坏严重的问题，建立了HJC（Holmquist Johnson Cook）损伤本构模型，运用非线性显示动力分析软件LS-DYNA对典型的山区桥梁在落石冲击条件下进行碰撞分析.在此基础上，对落石冲击能量进行分级，并对外套钢板和增加素混凝土保护层两种防护措施进行了对比研究.研究结果表明，落石潜在危险能量为2 500 kJ；当采用外套钢板措施时，侵彻率由原来的37.78%下降到13.89%，混凝土体积损伤减少30%；当采用素混凝土保护层措施时，侵彻率进一步下降到6.11%，混凝土体积损伤减少76%.
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| 关 键 词： | 落石冲击 山区桥梁 冲击能量 损失体积 HJC(Holmquist Johnson Cook)模型 |
| 收稿时间： | 2015-11-11 |
Influence of Rockfall Impact Energy on Mountain Bridge Damage |
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| GU Xiang,YU Zhixiang,ZHAO Lei,XU Hu.Influence of Rockfall Impact Energy on Mountain Bridge Damage[J].Journal of Southwest Jiaotong University,2016,29(6):1131-1137. |
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| Authors: | GU Xiang YU Zhixiang ZHAO Lei XU Hu |
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| Abstract: | To study the great bridge damage caused by rockfall impact, the damage constitutive model of holmquist-johnson-cook was established. The rockfall impact on typical brdiges was analyzed by the non-linear explicit dynamic software LS-DYNA. Then, the rockfall impact energy was graded, and two kinds of protective measures were compared, i.e., adding steel plate tube and thickening concrete protective layer. The results show that the potential dangerous rockfall impact energy is 2 500 kJ. If adding steel plate tube is adopted, the penetration rate decreases from 37.78% to 13.89%, and the volumetric damage of concrete is decreased by 30%. If thickening concrete protective layer is adopted, the penetration rate decreases to 6.11%, and the the volumetric damage of concrete is decreased by 76%. |
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