西南山区高速公路桥梁标准疲劳车辆荷载研究

李星新;;任伟新;钟继卫;

振动与冲击 ›› 2012, Vol. 31 ›› Issue (15) : 96-100.

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PDF(1269 KB)
振动与冲击 ›› 2012, Vol. 31 ›› Issue (15) : 96-100.
论文

西南山区高速公路桥梁标准疲劳车辆荷载研究

  • 李星新1,2,3,任伟新1,钟继卫2,3
作者信息 +

STANDARD FATIGUE TRUCK IN MONTANE SPEEDWAY BRIDGE

  • Xingxin Li 1,2,3 , Weixin REN 1,Jiwei Zhong 2,3
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文章历史 +

摘要

摘 要:疲劳车模型在桥梁疲劳评估中有着非常重要的作用,本文根据动态称重系统获得的车辆数据,并以等损伤度为理论基准,推导出适用于中国西南山区高速公路桥梁的3轴标准疲劳车模型。车辆统计数据和疲劳损伤度模拟计算表明,超过一半的疲劳损伤由6轴车引起,故根据统计数据以6轴车为原型设计出简化的3轴标准疲劳车模型,并根据Miner线性累积损伤法则,以实际车辆导致的损伤度为目标对疲劳车模型轴重和轴距进行修正。同时,本文针对西部山区高速公路桥梁提出两项建议:其一为基于弯矩概率函数曲线分析,建议最大应力幅峰值取为等效应力幅的3倍而不是AASHTO所规定的2倍,这主要由于该地区部分车辆超载较多所致;其二为BS5400疲劳车模型是实际车辆引起疲劳损伤的1.15倍从而高估了本地区的疲劳损伤,而AASHTO疲劳车引起的疲劳损伤与实际车辆导致的损伤也基本一致,故建议在西部山区高速公路疲劳车规范的选择时,宜选择AASHTO规范,但应根据实际通行车辆对疲劳车通行量进行修正。

Abstract

Abstract:The fatigue truck model is an important parameter in a fatigue evaluation, a 3-axle fatigue truck model was developed based on the weigh-in-motion traffic data and an analytical bridge model in the montane highway of Southwest China. The truck traffic data shows that the fatigue damage was dominated by the 6-axles trucks,a 3-axle fatigue truck model was developed based on the 6-axle truck statistic data,the damage accumulations caused by the Proposed fatigue truck righty meet the actual damage accumulations. Based on the cumulative probabilitie of the moment ranges, the peak stress range is suggested to be a stress level at 3 times of the effective stress range because of overload,however,the ratio of the effective stress in AASHTO was 2 times.The damage accumulations obtained from the simulation of the truck database were compared with BS5400,AASHTO and Proposed fatigue truck, Proposed fatigue truck and AASHTO fatigue truck with the actural daily flow of trucks are suggested in the montane speedway of Southwest China ,BS5400 is impropriety which relatively overestimate the damage.

关键词

钢桥疲劳 / 疲劳车 / 动态称重系统 / 西南山区高速公路

Key words

fatigue of steel bridge / fatigue truck / weigh-in-motion / southwest montane highway

引用本文

导出引用
李星新;;任伟新;钟继卫;. 西南山区高速公路桥梁标准疲劳车辆荷载研究[J]. 振动与冲击, 2012, 31(15): 96-100
Xingxin Li;;Weixin REN;Jiwei Zhong;. STANDARD FATIGUE TRUCK IN MONTANE SPEEDWAY BRIDGE[J]. Journal of Vibration and Shock, 2012, 31(15): 96-100

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