ECC板-薄壁钢管组合防护装置抗撞性能分析及优化  

Analysis and optimization on crashworthiness of ECC plate-thin walled steel pipe composite protective facility

作　　者：张景峰 冀豪豪 冯亮 孔令云 杨栋 ZHANG Jing-feng;JI Hao-hao;FENG Liang;KONG Ling-yun;YANG Dong(School of Highway,Chang'an University,Xi'an 710064,Shaanxi,China;Zhengzhou Municipal Engineering Survey Design&Research Institute,Zhengzhou 450018,Henan,China;CCIC West Testing Co.Led.,Xi'an 710032,Shaanxi,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]郑州市市政工程勘测设计研究院,河南郑州450018 [3]中检西部检测有限公司,陕西西安710032

出　　处：《长安大学学报（自然科学版）》2023年第4期40-49,共10页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(51808048);陕西省自然科学基础研究计划项目(2022JM-177);中央高校基本科研业务费专项资金项目(CHD300102212911)。

摘　　要：为降低桥梁上部结构在超高车辆撞击下的损伤程度,提出一种水泥基复合材料(ECC)板-薄壁钢管组合防护装置,该防护装置分为3个模块:扩散模块、吸能模块、固定模块。扩散模块由ECC板和钢筋网组成,直接承受超高车辆的撞击,吸能模块由薄壁钢管和填充聚氨酯泡沫组成,通过自身变形储存车辆撞击能量;固定模块由钢板组成,由钢板实现防护装置与主梁之间的可靠连接。建立防护装置精细化有限元模型,建模过程中重点考虑混凝土、ECC材料的弹塑性损伤以及防护装置与桥梁之间的非线性接触关系,采用显式动力分析软件Ls-Dyna对其防撞性能进行深入分析,同时对防护装置的参数敏感性进行探讨。以标准双轴卡车撞击预应力混凝土空心板桥上部结构为研究对象,以车辆速度80 km/h、车辆质量25 t以及碰撞超高250 mm为典型代表工况,分析防护装置的防撞性能。研究结果表明:在超高车辆撞击下,预应力混凝土空心板桥主要发生混凝土剥落、普通钢筋断裂等局部型损伤;组合防撞装置中ECC板可以有效扩散碰撞荷载,避免桥梁发生损伤;钢管内填充聚氨酯泡沫和增加ECC板厚可以减小防护装置变形,钢管高度增大可以增加防护装置吸能效果;从工程应用角度出发,应从防撞装置吸能和其自身抗冲击能力2个方面综合确定组合防撞结构设计参数,保证其防护效果。In order to reduce the damage of bridge superstructure under over-height vehicle collision,an ECC plate-thin walled steel pipe composite protective facility was proposed.The protective facility was comprised of threemodules,the diffusion module,energy absorption module,and fixing module.The diffusion module,consisting ofECC plate and reinforcement mesh,directly withstood impact from over-height vehicle.The energy absorptionmodule,made up of thin-walled steel pipe filled with polyurethane foam,stored the kinetic energy of the vehicleby deforming itself.The fixing module,constructed from steel plates,provided a reliable connection between theprotective facility and the main beam.The refined finite element model of the protective device was established,with a focus on the elastic-plastic damage of the concrete and ECC materials,as well as the nonlinear contactrelationship between the protective facility and the bridge.The explicit dynamic analysis software Ls-Dyna wasutilized to conduct an in-depth analysis of its crashworthiness performance.The parameters sensitivity of theprotective device was discussed.A standard two-axle truck impacting with the superstructure of prestressedconcrete hollow slab bridge was taken as research example.In a typical analysis case,the vehicle speed is 80 km/h,vehicle weight is 25 t and the over height of impact is 250 mm.The results show that the prestressedconcrete hollow slab bridge mainly presents localized damage that is concrete spalling and reinforcement fractureunder impact.The ECC plate in the composite protective facility can effectively disperse the impact load andprotect the bridge structure.The filled polyurethane foam in the steel pipe and thickening the ECC plate canreduce the deformation of composite protective facility.Increasing the pipe height will increase the energyabsorption effect of protective facility.From the perspective of engineering practical application,the designparameters should be determined comprehensively from the aspects of energy absorption and impac

关 键 词：桥梁工程 超高车辆 空心板桥 组合防护装置 抗撞性能 参数分析 

分 类 号：U447[建筑科学—桥梁与隧道工程]