车辆荷载对中承式拱桥吊杆体系的冲击效应分析  

Analysis of Impact Effect of Vehicle Load on Hanger System of Half-though Arch Bridge

作　　者：邵元[1] 孙宗光[1] 陈一飞[1] 李焕兰 

机构地区：[1]大连海事大学道路与桥梁研究所,辽宁大连116026

出　　处：《公路交通科技》2016年第1期82-88,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51178070);中央高校基本科研业务费专项资金项目(3132014326)

摘　　要：为深入研究中承式拱桥吊杆体系的耐久性,针对发生破坏的实例中短吊杆更易疲劳破坏的现象,考虑不平度影响,采用车桥耦合迭代方法,对某中承式钢管混凝土拱桥吊杆体系在车辆荷载下的冲击效应进行了数值模拟。分析了不同车速和桥面不平度下,吊杆动态内力(应力)的变化规律;比较了不同长度(位置)的吊杆在车辆荷载下所受冲击效应的特点和差异;根据车速分布模型,对吊杆在各种车速下的冲击效应进行了加权分析和综合评价。结果表明,在车辆荷载作用下,桥面不平度对吊杆的冲击效应影响明显;短吊杆的动态内力显著大于长吊杆,二者之间的最大差别幅度可达到28%。Among the destruction instances of half-through arch bridges,the shorter hangers are more likely to be ruined. To thoroughly investigate the hanger system durability of half-through arch bridges,the vehicle impact effect on a hanger system of a half-through CFST arch bridge under vehicle load is numerically simulated by using vehicle-bridge coupling method. The variation of dynamic internal force（ stress） in hangers under different vehicle speeds and road surface roughnesses are analysed. The characteristics and differences in impact effect on the hangers with different lengths（ positions） under vehicle load are compared. The weighted analysis and the comprehensive evaluation are conducted to research the impact effects of different vehicle speeds on the hangers based on the vehicle speed distribution model. The result shows that（ 1） the influence of bridge surface roughness on impact effect of hangers is significant under the vehicle load;（ 2） the dynamic internal forces in the shorter hangers induced by moving vehicles are significantly greater than those in the longer ones,the largest difference of dynamic internal forces among the hangers could be as high as 28%.

关 键 词：桥梁工程 中承式拱桥 车桥耦合迭代 冲击效应 车辆荷载 

分 类 号：U441[建筑科学—桥梁与隧道工程]