桥墩撞击力计算及影响因素研究  

Research on Calculation and Influence Factors of Impact Force of Piers

作　　者：李界全 张南[1] 高闵 LI Jiequan;ZHANG Nan;GAO Min(College of Civil Engineering,Nanjing Tech University,Nanjing,Jiangsu 211800,China)

机构地区：[1]南京工业大学土木工程学院,江苏南京211800

出　　处：《公路工程》2018年第2期23-29,共7页Highway Engineering

基　　金：国家自然科学基金资助(51278243)

摘　　要：为研究不同因素对桥墩撞击力的影响,进行了5根钢骨混凝土桥墩的小车撞击试验,通过改变撞击车速、车头形式和桥墩配钢形式得到了不同撞击条件下的撞击力时程曲线,并通过静力试验得到了桥墩撞击点处的"力—位移"关系,最后基于能量守恒建立了桥墩弹性和弹塑性阶段的撞击力计算公式,计算结果与试验结果基本吻合。研究结果表明:撞击能量、车头变形、桥墩刚度和桥墩状态对撞击力有一定影响;撞击力随着撞击能量或接触刚度提高而增大,并随着车头的变形耗能增多而减小。研究结果可为桥墩抗撞设计和研究提供一定参考。In order to study the influence of different factors on the impact force of the piers,5 steel-reinforced concrete(SRC)piers were tested under vehicle impact force.The time-history curves of the impact force of different situations were obtained by varying the velocities and frontal types of the vehicles and the embedded steel skeleton forms of the SRC piers.The relationship between the force and displacement of the impact position on the piers was also acquired by the static test.Formulas for calculating the impact force at both elastic stage and elasto-plastic stage of the piers were built on the basis of the conservation of energy and the calculated results are in agreement with the experimental results.The research results showed that the impact energy,deformation of the vehicle-frontal,stiffness and state of the piers have a certain influence on the impact force of piers.The impact force will become larger with the increment of either the impact energy or the contact stiffness while the increasing of the energy dissipated by the deformation of the vehicle-frontal will cause reduction of the force.It has provided the references for the design and research of anti-collision of the piers.

关 键 词：桥墩 车辆 撞击力 影响因素 能量守恒 

分 类 号：U441[建筑科学—桥梁与隧道工程]