落石冲击对山区桥墩的损伤研究  

Research on the Damage of Bridge Pier in Mountain Area under Impact of Rockfall

作　　者：顾乡[1] 赵雷[1] 余志祥[1] 徐洪弟[2] 

机构地区：[1]西南交通大学,成都610031 [2]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道工程学报》2016年第3期72-75,98,共5页Journal of Railway Engineering Society

基　　金：国家科技支撑计划资助项目(2009BAJ28B01);四川省交通厅科研资助项目(川交勘设-2011-035)

摘　　要：研究目的:为探明我国西部山区落石对桥梁墩柱冲击造成的损伤,运用非线性显示动力分析软件LSDYNA,基于HJC损伤本构有限元模型,以都汶公路线上的典型桥梁墩柱为参考,研究落石冲击双柱式桥墩的损伤,以及对比分析落石冲击的高度、速度、偏心距、冲击角度、冲击面以及直径因素对墩柱的损伤破坏程度。研究结论:(1)落石的直径和冲击速度对桥梁墩柱体积损伤率的影响最大,说明落石的能量越大,对墩柱破坏程度越深,建议采用包含直径和速度的能量参数E作为撞击破坏的参考量;(2)建议都汶路沿线桥采取外套钢板或增加混凝土保护层等保护措施来降低落石对墩柱的冲击,当落石潜在撞击能量过大时,建议进一步采取主动防护措施,如防护网或防护栏等,以避免造成构件的整体破坏;(3)该研究成果可用于指导桥梁墩柱抗落石冲击设计。Research purposes ： In order to research the damage of bridge piers, which was caused by the roekfall in our western mountain area, based on the damage constitutive model proposed by HJC, the damage of double - column pier under the impact of rockfall was analysed by the nonlinear explicit dynamic software LS - DYNA according to the typical bridge pier on Dujiangyan to Wenchuan Road. And the degree of pier damage was analysed by changing impact height,velocity, eccentricity, impact angle, impact surface and the rock diameter.Research conclusions ： （ 1 ） The rock diameter and velocity were the parameters with the most influence on the damage volumn rate of bridge pier. It indicated that the more energy rockfall had, the greater damage bridge pier was suffered. The energy parameter E which included diameter and velocity, should be adopted to be the reference on damage of impact. （2） Adding steel plate tube and thickening concrete protective layer should be adopted to reduce the damage of rockfall to bridge pier on Dujiangyan to Wenchuan Road. When the potential energy of rockfall was too big, a further active protection measure, such as protective nets and protective railings, should be taken to avoid the damage of the whole components. （3） This research results can be used in guiding for the design of protective measures for mountain bridge piers under impact of rockfall.

关 键 词：落石冲击 山区桥梁 HJC模型 体积损伤率 

分 类 号：TU312.3[建筑科学—结构工程]