| 钢筋混凝土柱式桥墩抗车撞可靠度分析研究 |
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| 引用本文： | 樊伟,毛薇,庞于涛,何广.钢筋混凝土柱式桥墩抗车撞可靠度分析研究[J].中国公路学报,2021,34(2):162-176. |
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| 作者姓名： | 樊伟 毛薇 庞于涛 何广 |
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| 作者单位： | 1. 湖南大学土木工程学院, 湖南长沙 410082;2. 湖南大学风工程与桥梁工程湖南重点实验室, 湖南长沙 410082;3. 中国地质大学(武汉)工程学院, 湖北武汉 430074 |
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| 基金项目： | 国家自然科学基金项目(51978258);湖湘青年科技创新人才计划项目(2020RC3018);河南交通科技项目(2020G11)。 |
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| 摘 要： | 目前桥梁车撞以确定性指定事件分析居多，鲜有研究探讨车撞下桥墩的失效概率和可靠性，而制约其发展的主要原因是大样本下碰撞分析计算时的效率和精度问题。为此，探讨将简化分析模型与响应面、蒙特卡洛相结合的可靠度分析方法。首先，建立精细化的车辆撞击跨线桥梁模型，讨论了关键的混凝土本构参数取值问题，给出相应的修正方法。通过与全桥模型进行对比，研究不同简化桥梁结构分析模型的合理性，给出合理的简化桥梁结构分析模型，提高了计算效率。将建立的简化分析模型与响应面方法相结合，合理设置试验工况，通过精细化仿真分析建立车撞后桥墩剩余承载能力的响应面公式。采用建立的响应面作为替代模型，通过蒙特卡洛抽样方法对主要变量进行抽样，计算不同参数情况下的撞后剩余承载能力，基于撞后剩余承载能力的损伤指标，给出了不同损伤状态的失效概率和可靠度。研究结果表明：采用规范公式计算桥墩初始承载能力将会低估撞后桥墩损伤及相应的失效概率，偏于不安全；建立的响应面公式预测精度高，可作为车撞桥墩的替代模型，是一套完整、合理的车撞桥墩可靠度分析方法，可为柱式桥墩抗车撞可靠度设计提供参考。
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| 关 键 词： | 桥梁工程 碰撞 有限元模型 试验设计 可靠度 柱式桥墩 |
| 收稿时间： | 2019-12-05 |
Reliability Analysis of Reinforced Concrete Column Bridge Piers Subjected to Vehicle Collisions |
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| FAN Wei,MAO Wei,PANG Yu-tao,HE Guang.Reliability Analysis of Reinforced Concrete Column Bridge Piers Subjected to Vehicle Collisions[J].China Journal of Highway and Transport,2021,34(2):162-176. |
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| Authors: | FAN Wei MAO Wei PANG Yu-tao HE Guang |
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| Affiliation: | 1. School of Civil Engineering, Hunan University, Changsha 410082, Hunan, China;2. Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan University, Changsha 410082, Hunan, China;3. Faculty of Engineering, China University of Geosciences, Wuhan 430074, Hubei, China |
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| Abstract: | Current studies have mainly performed deterministic analyses of bridge structures subjected to vehicle collisions for a given event,with few studies discussing the failure probability and reliability of bridge piers subjected to vehicle collisions.The main constraint to its development is the efficiency and accuracy of collision analysis calculations for large samples.Therefore,this study had the goal of developing a reliability analysis method that combined a simplified analysis model with a response surface and Monte Carlo simulations.First,a refined finite element model of a bridge structure under vehicle collision was established.The key concrete constitutive parameters were discussed,and the corresponding correction method was given.The rationality of different simplified bridge structure analysis models was studied in comparison to a full bridge model,and a reasonable simplified bridge structure analysis model was developed to improve the calculation efficiency.Experimental samples were reasonably set by combining the established simplified analysis model with the response surface method,and a response surface formula for the remaining bearing capacity of the bridge pier after a vehicle collision was established through refined simulation analysis.Using the established response surface as an alternative model,the main variables were sampled using the Monte Carlo sampling method,and the remaining capacity after a collision was calculated under different parameters,based on the damage index of the remaining bearing capacity after the collision.Finally,the failure probability and reliability values for different damage states were given.The research results showed that the calculation of the initial bearing capacity of a pier using a standardized formula will underestimate the damage to the pier and the corresponding failure probability after a collision,which is unsafe.The response surface formula established has high prediction accuracy and can be used as an alternative model for vehicle collision on bridge pier,forming a complete and reasonable reliability analysis method for vehicle collision on the pier,and providing a reference for the design of the vehicle collision reliability of the column pier. |
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| Keywords: | bridge engineering collision finite element model design of experiment reliability column bridge pier |
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