公路连续刚构桥梁车桥耦合共振判定方法  

Judging method for coupled vibration resonance of vehicle-bridge of continuous rigid frame bridges

作　　者：王凌波[1] 蒋培文 康馨 马印平[1] 周勇军[1] 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]陕西省交通厅基本建设工程质量监督站,陕西西安710075 [3]密苏里科技大学土木工程学院,美国密苏里65401

出　　处：《中南大学学报（自然科学版）》2014年第11期4050-4058,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51008028);中央高校基本科研业务专项基金资助项目(CHD2011JC155)~~

摘　　要：针对公路连续刚构桥梁的车桥耦合共振判定问题,首先提出基于ANSYS的车桥耦合振动响应数值分析方法,进而对车桥耦合振动的特殊情况下,车桥耦合共振效应进行研究。以单车辆及多车辆行驶时的公路连续刚构桥梁为背景,分别给出车桥耦合共振效应的判定方法及相关公式,并给出不同行驶工况下的判定算例。研究结果表明:连续刚构桥梁存在与单车辆或等间距车流发生车桥耦合共振响应的可能性,需运用所提出的公式进行判定;共振发生时,桥墩截面处荷载效应值成倍增长,主梁截面处荷载效应增量不明显;建议在连续刚构桥各车道纵向不同位置设置减速标志,以"打乱"车流,减小共振概率。A numerical analysis method based on ANSYS was presented to judge the coupled vibration resonance of vehicle-bridge of continuous rigid frame bridges. Based on the method, one special condition of vehicle-bridge coupled vibration and resonance effect was carried out. Finally, the criterion and the relative formulas of the resonance effect was presented through the models of continuous rigid frame bridge in both single and multiple vehicles driving conditions.The results show that for the continuous rigid frame bridges there exist the possibility that the coupled vibration resonance of vehicle-bridge would occur with the single vehicle and evenly spaced traffic flow, which can be judged by the equation presented in this paper. The load effect number of bridge pier has rapid growth, while the beam section is approximately the same when the resonance occurs. Therefore, setting up the traffic sign of deceleration in different longitudinal positions can reduce the possibility of the resonance.

关 键 词：桥梁工程 车桥耦合振动 连续刚构桥梁 车桥耦合共振 冲击系数 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]