摘要
为揭示预应力箱型梁桥遭受超高车辆撞击下的损伤,将此类撞击的数字仿真与试验对比研究了箱型梁桥上部结构动态响应.运用LS-DYNA软件建立了精细化预应力箱型梁桥上部结构的三维分离式模型和车辆与桥梁上部结构的耦合模型,在汽车以80 km/h速度正面撞击桥梁时,研究桥梁、汽车的破坏损伤和桥梁整体位移,分析比较了车速分别为30、50、80 km/h时,桥梁上部结构遭受超高车辆撞击的动态响应.研究结果表明:质量较大的预应力箱型梁桥上部结构遭受超高车辆撞击时,桥梁整体损伤较小,应主要研究其局部破坏;撞击过程中车厢的形变会导致车-桥之间撞击形式由正面撞击向冲切撞击转变;车-桥碰撞力值和桥梁撞击区域位移值均与车速成正相关,当车速为80 km/h时的最大位移值为165 mm.
In order to reveal the damage of the prestressed box-girder bridge caused by over high truck impact, a comparative analysis between a numerical simulation and an impact experiment was conducted to study the dynamic response of the superstructure of a box-girder bridge. A three- dimensional separation model of the prestressed box-girder bridge superstructure, together with the coupling model of the truck and the bridge superstructure, was established using LS DYNA software. With this model, the damage of bridge and truck and the overall displacement of bridge were investigated when the truck impacted the bridge frontally at a speed of 80 km/h, and the dynamic responses of the bridge superstructure to impacts of the over-high truck at speeds of 30, 50, and 80 km/h were compared. The results show that when the truck hit the high mass bridge, the whole bridge damage was little and therefore the study should focus on its local damage ; during the collision, the deformation of the truck carriage can result in the transformation of the frontal impact into a punching impact; both the impact force value and the displacement value of the impact area of the bridge are positively correlated with the truck speed, and the maximum displacement is 165 mm when the truck speed is 80 km/h.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2016年第4期632-638,共7页
Journal of Southwest Jiaotong University
基金
国家自然科学基金资助项目(50678116
51178310)
关键词
箱型梁桥
汽车撞击
分离式模型
动态响应
box girder bridge
vehicle impact
separation model
dynamic response
作者简介
田力（1970-），男，副教授，博士，研究方向为工程结构抗爆、抗冲击理论及防护技术，E-mail：hian@qu．edu．cm
