简述独柱支撑匝道桥抗倾覆验算汽车荷载研究-学兔兔 www.xuetutu.com.pdf

学兔兔 桥梁建设 2012年第42卷第3期(总第213期) l4 Bridge Construction，Vo1．42，No．3，2012(Totally No．213) 文章编号：1003—4722(2012)03—0014—05 独柱支撑匝道桥抗倾覆验算汽车荷载研究 李盼到，马利君 (北京市市政工程设计研究总院，北京100082) 摘 要：为减免独柱支撑匝道桥倾覆事故的发生，对该类桥梁抗倾覆验算汽车荷载进行研究。 通过对国内外相关规范汽车荷栽的比较、已有该类桥梁倾覆事故的汽车荷载调查分析、重载交通汽 车荷载模式下该类桥梁倾覆效应的研究，得出：对于重载交通线路，《公路桥涵设计通用规范》(JTG D6o一2004)汽车荷栽计算的桥梁倾覆效应小，安全度不足，且随着桥梁联长的增长，安全度降低。 建议在计算该类桥梁倾覆效应时，汽车荷载以加载总量为主要控制指标(可采用控制单车道折算线 荷载集度的方式)，具体数值应根据实际条件，就当地发生重载交通的程度确定。 关键词：匝道桥；抗倾覆验算；汽车荷载；车道荷载；车队荷载；重载交通 中图分类号：U441．2 文献标志码：A Study of T／uck Load for Overturning Resistance Checking Calculation of Single。-Column。_Supported Ramp Bridge LI Pan-dao，MA Li-jun (Beijing Municipal Engineering Design 8L Research Institute，Beijing 100082，China) Abstract：To minimize and avoid the overturning accidents of single—column-supported ramp bridge，the truck load for overturning resistance checking calculation of the bridge of such type is studied．On the basis of comparison of the truck loads in the relevant domestic and foreign codes， investigation and analysis of the loads in the existing overturning accidents and study of the over— turning effect of the bridge under the truck load of heavy—load traffic mode，it is concluded that for the heavy—load traffic route，the calculated overturning effect of the bridge according to the truck load in the General Code for Design of Highway Bridges and Culverts(JTG D60—2004)is little，the safety degree is insufficient and wi