摘要
为了研究混凝土收缩徐变效应和环境温度变化对车辆荷载作用下超宽混凝土自锚式悬索桥受力性能的影响,以目前中国最宽的混凝土自锚悬索桥——湖南路大桥为背景开展分析。首先,建立桥梁整体精细化有限元模型,并结合现场荷载试验的实测数据进行验证。其次,预测不同服役龄期时桥梁的结构状态。最后,分析主要构件力学响应的演化规律。研究结果表明,主梁的支座类型对响应的变化趋势有着显著影响。超宽主梁的剪力滞效应和车轮局部效应较为显著。在升温20℃和标准车辆荷载作用下,桥梁服役30年后主塔的最大位移为0.033 m。此外,中跨跨中主梁底板大部分区域的纵向拉应力超过5 MPa。桥梁服役10年后,在偏心车辆荷载作用下,主梁道路中心线处挠度和主梁边缘处挠度之间的差值达到0.07 m。本文研究成果可为类似超宽混凝土自锚式悬索桥的健康监测和安全评价提供重要依据。
In order to study the influence of concrete shrinkage and creep effect and temperature change on the extrawide concrete self-anchored suspension bridge under vehicle load,the Hunan Road Bridge,which is the widest concrete self-anchored suspension bridge in China,was chosen as background.Firstly,the refined finite element model(FEM)was established,which was validated by the measured data of field load test.Secondly,the structural states at different ages were predicted.Finally,the evolution laws of component responses were analyzed.The research results show that the bearing type of girder has significant influence on the response change trends.The shear lag effect of girder and local effect of wheel are significant.Under the temperature rise of 20℃and standard vehicle load,the maximum tower displacement is 0.033 m after 30 years.In addition,the longitudinal tensile stress in most area of bottom plate at middle section exceeds 5 MPa.Moreover,the difference of girder deflection between road centerline and edge reaches 0.07 m under eccentric load after 10 years.The research results can provide an important basis for the health monitoring and safety evaluation of similar extra-wide concrete self-anchored suspension bridges.
作者
周广盼
杜爱祥
王明洋
范进
李爱群
ZHOU Guang-pan;DU Ai-xiang;WANG Ming-yang;FAN Jin;LI Ai-qun(School of Science,Nanjing University of Science and Technology,Nanjing 210094,China;School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;State Key Laboratory of Explosion and Impact and Disaster Prevention and Mitigation,Army Engineering University of PLA,Nanjing 210007,China;School of Civil Engineering,Southeast University,Nanjing 210096,China;Beijing University of Civil Engineering and Architecture,Beijing Advanced Innovation Center for Future Urban Design,Beijing 100044,China)
基金
Project (BK20200494) supported by the Natural Science Foundation of Jiangsu Province,China
Project (2021M701725) supported by the China Postdoctoral Science Foundation
Project (2021K522C) supported by the Jiangsu Postdoctoral Research Funding Program,China
Project (30919011246) supported by the Fundamental Research Funds for the Central Universities,China。
关键词
自锚式悬索桥
超宽混凝土梁
性能退化
预测
车辆荷载
混凝土收缩徐变
温度变化
self-anchored suspension bridge
extra-wide concrete girder
performance degradation
prediction
vehicle load
concrete shrinkage and creep
temperature change
