超高车辆撞击桥梁上部结构研究：损坏机理与撞击荷载-LuXinzheng.PDF

第26 卷增刊II Vol.26 Sup.II 工 程 力 学 2009 年 12 月 Dec. 2009 ENGINEERING MECHANICS 115 文章编号：1000-4750(2009)Sup.II-0115-11 超高车辆撞击桥梁上部结构研究： 损坏机理与撞击荷载 * 陆新征，张炎圣，何水涛，卢 啸 (清华大学土木工程系，清华大学结构工程与振动教育部重点实验室，北京 100084) 摘 要：近年，超高车辆撞击桥梁上部结构的事故频繁发生，严重威胁桥梁结构安全与城市交通运行。为减小超 高车辆撞击桥梁上部结构造成的损失，需要提高桥梁上部结构抗撞能力，然而国内相关研究仍很不足。该文基于 精细化非线性有限元和事故案例分析，研究超高车辆撞击桥梁上部结构的损坏机理与撞击荷载。分析结果表明： 超高车辆撞击使桥梁上部结构产生整体变形损伤、局部破坏甚至落梁破坏，撞击荷载包括撞击冲量和局部冲击力， 不同车型撞击荷载差别较大。 关键词：撞击；桥梁上部结构；超高车辆；精细化非线性有限元；损坏机理；撞击荷载 中图分类号：U447; U443.3 文献标识码：A COLLISION BETWEEN OVER-HIGH TRUCKS AND BRIDGE SUPERSTRUCTURES: DAMAGE MECHANISM AND IMPACT LOADS * LU Xin-zheng , ZHANG Yan-sheng , HE Shui-tao , LU Xiao (Department of Civil Engineering, Key Laboratory of Structural Engineering and Vibration of China Education Ministry, Tsinghua University, Beijing 100084, China) Abstract: Recently, accidents of collisions between over-high trucks and bridge superstructures happen frequently, which seriously threaten the safety of bridges and city traffic system. In order to reduce the loss due to the over-high-truck-to-bridge collision, the collision resistance of bridge superstructures need to be strengthened, on which the research is still very lack currently in China. Based on the high-precision nonlinear finite element simulation and accident investigation, this paper discusses the damage mechanism and collision loads of impact between over-high trucks and bridge superstructures. Study results show that the damage modes of bridge superstructures impacted by over-high trucks include global deformation damage, local damage and girder-falling. The impact