摘要
提出了用于城市高架墩车撞防护的拱面复合材料套箱,为分析新型套箱的撞击力折减效果,开展了拱形、波浪形、半圆形、锯齿形和矩形等5种撞击面形状试件的准静态压缩试验,对比试件的荷载-位移曲线和吸能能力;以传统的钢+混凝土防撞装置和垂直立面复合材料防撞套箱为对照,通过车撞桥数值仿真分析了不同撞击工况下拱面复合材料套箱的撞击力折减率,从而验证新型套箱的缓冲性能。研究结果表明:防车撞装置平面形状可采用平行四边形提高对高架墩易撞易损位置的防护;拱形撞击面可显著提升防车撞装置的吸能能力,相比传统的垂直立面吸能能力提高约26%;拱面复合材料套箱对于8 t货车的撞击可有效折减33.3%的车撞力,对于25 t货车的撞击可有效折减51.5%的车撞力;拱面复合材料套箱的车撞力折减效果优于钢+混凝土装置和垂直立面套箱,较钢+混凝土装置可至少提高111.0%,较垂直立面套箱可至少提高45.5%。
The arched-surface composite material device for protecting urban elevated piers against vehicle collision was proposed.In order to analyze the collision force reduction effect of the new device,the quasi-static compression tests of specimens with five kinds of collision surface shapes such as arched,wavy,semicircular,sawtooth and rectangular shapes were carried out,and the load-displacement curve and energy-absorbing capacity of the test specimens were compared.Compared with the traditional steel+concrete anti-collision device and the vertical face composite material device,the collision force reduction rate of the arched-surface composite material device under different collision conditions was analyzed through numerical simulation of vehicle-bridge collision,so as to verify the buffering performance of the new device.The research results show that the planar shape of the anti-collision device can adopt parallelograms to improve the protection of the collision-prone and damage-prone position of the elevated pier.The arched collision surface can significantly improve the energy-absorbing capacity of the anti-collision device,which is about 26%higher than that of the traditional vertical face.The arched-surface composite material device can effectively reduce the vehicle collision force by 33.3%for the collision of an 8-ton truck and by 51.5%for the collision of a 25-ton truck.The reduction effect of the vehicle collision force of the arched-surface composite material device is better than that of the steel+concrete device and the vertical facade device,which is at least 111.0%higher than that of the steel+concrete device and at least 45.5%higher than that of the vertical facade device.
作者
何沛建
耿波
冯侠
曾浩楠
HE Peijian;GENG Bo;FENG Xia;ZENG Haonan(State Key Laboratory of Bridge Engineering Safety and Resilience,Chongqing 400067,China;China Merchants Chongqing Communications Research&Design Institute Co.,Ltd.,Chongqing 400067,China)
出处
《重庆交通大学学报(自然科学版)》
北大核心
2025年第8期15-24,共10页
Journal of Chongqing Jiaotong University(Natural Science)
基金
国家重点研发计划资助项目(2023YFB2604400)。
关键词
桥梁工程
城市高架墩
防车撞装置
车撞力折减率
bridge engineering
urban elevated pier
anti-vehicle-collision device
reduction rate of the vehicle collision force
