超载对钢-混凝土组合梁桥疲劳力学性能影响分析  

Influence of overload on fatigue mechanical performance of steel-concrete composite girder bridges

作　　者：郭至博 孟令佩 卜建清 张吉仁 荀敬川 GUO Zhibo;MENG Lingpei;BU Jianqing;ZHANG Jiren;XUN Jingchuan(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;School of Traffic and Transportation,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;Key Laboratory of Wind and Bridge Engineering of Hunan Province,Changsha,Hunan 410082,China;CSCEC Road and Bridge Group Company Limited,Shijiazhuang,Hebei 050001,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]石家庄铁道大学交通运输学院,河北石家庄050043 [3]风工程与桥梁工程湖南省重点实验室,湖南长沙410082 [4]中建路桥集团有限公司,河北石家庄050001

出　　处：《河北工业科技》2023年第1期1-9,共9页Hebei Journal of Industrial Science and Technology

基　　金：国家重点研发计划项目(2021YFB2600600,2021YFB2600605);河北省重点研发计划项目(19275405D)。

摘　　要：为了进一步揭示车辆超载对组合结构桥梁疲劳力学性能的影响规律,并减小车辆超载对桥梁疲劳刚度和剩余承载力等性能所产生的不利影响,对现有钢-混凝土组合梁疲劳刚度的理论计算方法加以改进。基于疲劳荷载计算模型量化分析超载车辆的荷载放大效应,并以某实桥为例分析了不同超载程度下该桥疲劳刚度、抗剪连接度与剩余承载力的退化规律。结果表明:随着超载程度的增加,组合梁桥疲劳刚度与剩余承载力的退化速率和退化量均有增大趋势,最大退化量分别为42%和32%,呈现出明显的非线性;抗剪连接度下降,但均保持在完全抗剪连接范围内。所得出的超载对疲劳刚度与剩余承载力的影响规律可为进一步完善钢-混凝土组合梁桥的疲劳损伤理论提供借鉴。In order to further reveal the influence of vehicle overloading on the fatigue mechanical performance of composite structure bridges,and reduce the adverse effects of vehicle overloading on the fatigue stiffness and residual bearing capacity of bridges,the existing theoretical calculation methods of fatigue stiffness of steel-concrete composite beams were improved.The load amplification effect of overloaded vehicles was quantitatively analyzed based on the fatigue load calculation model,and a real bridge was taken as an example to analyze the degradation law of fatigue stiffness,shear connectivity and residual bearing capacity of the bridge under different overload levels.The results show that with the increase of overload,the degradation rate and amount of fatigue stiffness and residual bearing capacity of composite girder bridge increase,and the maximum degradation amount is 42% and 32% respectively,showing obvious nonlinearity;The shear connectivity decrease,but remain within the range of full shear connectivity.The influence of overload on fatigue stiffness and residual bearing capacity can provide reference for further improving the fatigue damage theory of steel-concrete composite girder bridges.

关 键 词：桥涵工程 钢-混凝土组合梁 疲劳刚度 剩余承载力 车辆超载 

分 类 号：U441.4[建筑科学—桥梁与隧道工程] TU398[交通运输工程—道路与铁道工程]