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公路梁式桥上部结构洪水作用机理及抗洪性能研究 被引量:3

STUDY ON FLOOD ACTION MECHANISM AND FLOOD RESISTANCE OF HIGHWAY GIRDER BRIDGE SUPERSTRUCTURE
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摘要 洪水灾害是影响桥梁结构安全运行的严重威胁,洪水发生时流水冲击力直接作用于桥梁结构,以往桥梁设计中对水位线以上的桥梁上部结构可能遭受的洪水作用缺乏考虑,造成桥梁上部结构抗洪能力不足。该文以洪水的力学性能为基础,研究了洪水对桥梁上部结构的作用机理,提出了洪水破坏力计算公式及相关参数的确定方法,分析了桥梁上部结构在洪水作用下的主要失效模式及对应的力学平衡方程。研究表明,洪水对桥梁上部结构的主要作用力包括水平冲击力、竖向上浮力、上托力。相应的桥梁上部结构的破坏模式主要有支座滑动、支座剪切、整体倾覆等。在此基础上,针对桥梁上部结构的主要薄弱点,遵循洪水破坏力与结构抗力之间的平衡关系,提出了桥梁上部结构发生支座滑动破坏、支座剪切破坏、整体倾覆破坏模式下的抗洪性能分析思路及计算公式,对公路桥梁的抗洪设计及安全性评估具有指导意义。 Flood is a serious threat to the bridge across the river,the direct acting force of flood on a bridge is the impact of water.In the past,the flood action on bridge superstructure above water level was neglected in bridge design,which results in the insufficient flood resistance of bridge superstructure.Based on mechanical properties of flood water,it studies the action mechanism of flood on bridge superstructure and puts forward the calculation formula of flood damage force and the determination method of related parameters;and then analyzes the main failure mode of superstructure under the action of flood.The results show that the bridge superstructure is mainly affected by horizontal impact force,vertical buoyancy force and uplift force under the action of flood;the failure modes of the superstructure include sliding of bearing,shear of bearing and overall overturning.On this basis,according to the balance and stability theory between the flood damage and structural resistance,the design method and calculation formula of the bridge superstructure subjected to failure modes of bearing sliding failure,bearing shear failure and overall overturning are proposed.The results can be used for the flood prevention design and safety assessment of highway bridges.
作者 李鹏飞 毛燕 董振华 韦韩 LI Peng-fei;MAO Yan;DONG Zhen-hua;WEI Han(Research Institute of Highway Ministry of Transport,Beijing 100088,China)
出处 《工程力学》 EI CSCD 北大核心 2020年第S01期217-223,共7页 Engineering Mechanics
基金 中央级公益性科研院所基本科研业务费专项资金项目(2018-9019)。
关键词 桥梁工程 梁式桥 上部结构 洪水作用 抗洪性能 稳定性 理论分析 bridge engineering girder bridge superstructure flood action flood resistance stability theoretical analysis
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