落石冲击能量对山区桥梁损伤的影响

顾乡; 余志祥; 赵雷; 许浒

doi:10.3969/j.issn.0258-2724.2016.06.012

落石冲击能量对山区桥梁损伤的影响

doi: 10.3969/j.issn.0258-2724.2016.06.012

顾乡¹,
余志祥^1,2,3, ,,
赵雷¹,
许浒¹

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）

详细信息

作者简介:
顾乡(1987-),男,博士研究生,研究方向为现代桥式及桥梁结构设计理论,E-mail:guxiang_x@163.com

通讯作者:
余志祥(1976-),男,副教授,博士,研究方向为结构工程,E-mail:yzxzrq@swjtu.eud.cn

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- 文章访问数: 560
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- 被引次数: 0
出版历程
- 收稿日期: 2015-11-11
- 刊出日期: 2016-12-25

Influence of Rockfall Impact Energy on Mountain Bridge Damage

GU Xiang¹,
YU Zhixiang^{1,2,3
, ,},
ZHAO Lei¹,
XU Hu¹

摘要

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%.
- 落石冲击 /
- 山区桥梁 /
- 冲击能量 /
- 损失体积 /
- HJC(Holmquist Johnson Cook)模型
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%.
- rockfall impact /
- mountain bridge /
- impact energy /
- volumetric damage /
- HJC(Holmquist Johnson Cook) model

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参考文献(17)

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