RC桥墩的爆炸毁伤规律及快速计算模型
Explosive Damage Law and Rapid Calculation Model for RC Bridge Piers
姜豪杰 1彭永 2孙宇雁 3王子国 3徐佳沛4
作者信息
- 1. 青岛理工大学 土木工程学院,山东 青岛 266520;国防科技大学 理学院,湖南 长沙 410073
- 2. 国防科技大学 理学院,湖南 长沙 410073
- 3. 青岛理工大学 土木工程学院,山东 青岛 266520
- 4. 同济大学 土木工程学院,上海 200092
- 折叠
摘要
针对爆炸作用下钢筋混凝土(Reinforced concrete,RC)桥墩的毁伤效应预测问题,基于数值模拟方法详细讨论炸药当量、爆炸距离、爆炸高度、桥墩直径、纵筋配筋率、箍筋配筋率和轴压比等参数对RC桥墩损伤破坏形态以及残余承载力的影响,获得爆炸荷载作用下典型陆地足尺RC桥墩的毁伤破坏规律以及残余承载性能,随着爆炸高度的增大,地面反射作用减弱使得桥墩残余承载力增加,并且适当增大桥墩轴压比可提升桥墩的残余承载力.采用分项系数法,以爆炸后RC桥墩的残余承载能力为指标,提出同时考虑宽域范围爆炸参数和RC桥墩构件参数以及初始受压状态影响的圆形RC桥墩毁伤效应计算公式,可对典型桥墩爆炸毁伤进行快速预测.
Abstract
For the prediction of damage effect of reinforced concrete(RC)bridge piers subjected to explosion,the effects of explosive equivalent,explosion distance,explosion height,pier diameter,longitudinal reinforcement rate,hoop reinforcement rate,axial compression ratio and other parameters on the damage pattern and residual bearing capacity of RC bridge piers are discussed in detail through numerical simulation,and the damage law and residual bearing performance of a typical land-based RC bridge pier under the action of explosion load are obtained.As the explosion height increases,the ground reflection effect is weakened so that the residual bearing capacity increases,and an appropriate increase in the axial compression ratio can enhance the residual bearing capacity of bridge pier.By using the sub-coefficient method and taking the residual bearing capacity of RC bridge piers after explosion as an indicator,a formula considering a wide range of explosion parameters,the bridge pier component parameters and the initial stress state is proposed for calculating the damage effect of round RC bridge piers,which can quickly predict the damage of typical bridge piers subjected to explosion.
关键词
桥墩/毁伤效应/数值模拟/残余承载力/快速预测Key words
bridge pier/damage effect/numerical simulation/residual bearing capacity/rapid prediction引用本文复制引用
出版年
2024
NETL
NSTL
万方数据