摘要To evaluate the influence of concrete creep effect on spatial stress in concrete, the formulas for recursive calculation of equivalent nodal loads of concrete creep of PC composite unit under multi-axial stress was considered. The formulas are extended to general cases, and then an FEM program for calculating concrete creep is developed. A typical continuous PC bridge is illustrated to analyze the regular pattern of structural creep behavior. The differences in creep calculation modes using different codes and variation characteristic of main girder deflection are found. The service stage characteristics of a PC box girder are evaluated to determine the redistribution of longitudinal normal stress at the top, bottom, and principal stress at the web. Finally, recommendations for the reasonable arrangement of prestressed tendons are provided.
Abstract：To evaluate the influence of concrete creep effect on spatial stress in concrete, the formulas for recursive calculation of equivalent nodal loads of concrete creep of PC composite unit under multi-axial stress was considered. The formulas are extended to general cases, and then an FEM program for calculating concrete creep is developed. A typical continuous PC bridge is illustrated to analyze the regular pattern of structural creep behavior. The differences in creep calculation modes using different codes and variation characteristic of main girder deflection are found. The service stage characteristics of a PC box girder are evaluated to determine the redistribution of longitudinal normal stress at the top, bottom, and principal stress at the web. Finally, recommendations for the reasonable arrangement of prestressed tendons are provided.
基金资助:Supported by the National Natural Science Foundation of China (No.51108046);the Hunan Provincial Natural Science Foundation of China (No.13JJ6049);and the Road and Transport R&D Project for Western Regions of China Commissioned by Ministry of Transport (No.20113182231010)
袁明, 洪思玮, 颜东煌. 基于预应力混凝土组合单元的PC连续箱梁桥混凝土徐变效应研究[J]. Journal of Highway and Transportation Research and Development, 2013, 7(3): 37-46.
YUAN Ming, HONG Si-wei, YAN Dong-huang. Composite Unit-based Evaluation of the Creep Effects of Continuous Prestressed Concrete Box Girders. Journal of Highway and Transportation Research and Development, 2013, 7(3): 37-46.
[1] WANG Jin-feng, WU Guang-yu. Simulation Theory and Engineering Application of Bridge Structure[M]. Hanzhou:Zhejiang University Press, 2007. (in Chinese)
[2] LOU Zhuang-hong. Main Faults in Large Span Beam Bridges[J]. Journal of Highway and Transportation Research and Development, 2006, 23(4):84-87. (in Chinese)
[3] LOU Zhuang-hong. Defect on Existing Prestressed Concrete Beam Bridges[M]. Beijing:China Communications Press, 2004. (in Chinese)
[4] YUAN Ming, YAN Dong-huang. Concrete Strength of Vertical Joint in Cantilever-cast Segment of Prestressed Concrete Box Girder Bridge[J]. Journal of Highway and Transportation Research and Development, 2011, 28(6):103-108. (in Chinese)
[5] WANG Wen-da,ZOU Ai-hua,ZHANG Peng-peng.Behavior of Rectangular CFST Axial mpressive Stub Column nuder Long-term Loading[J].Journal of Highway and Transportation Research and Development,2011,28(7):73-78.(in Chinese)
[6] HINTON E, OWEN D R J. Finite Element Software for Plates and Shells[M]. Swansea, UK:Pineridge Press, 1984.
[7] ZHANG Feng. Analysis of the Structural Behavior of Box Girders after Cracking[D]. Nanjing:Southeast University, 2006. (in Chinese)
[8] YAN Dong-huang, TIAN Zhong-chu, LI Xue-wen, et al. Finite Element Method and Application for the Shrinkage and Creep of Concrete Bridges[J]. China Journal of Highway and Transport, 2004, 17(2):55-58. (in Chinese)
[9] JTG D62-2004, Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts[S]. (in Chinese)
[10] ZHU Bo-fang. Finite Element Method Theory and Application[M]. Beijing:China Water Power Press, 2000. (in Chinese)
[11] HU Di. Analysis of Creep Effect in Prestressed Concrete Bridge[D]. Changsha:Central South University, 2003. (in Chinese)
[12] JTJ 023-85, Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts[S]. (in Chinese)
[1]
常柱刚, 王林凯, 夏飞龙. 基于CV NewMark-b法桥梁风致振动FSI数值模拟[J]. Journal of Highway and Transportation Research and Development, 2019, 13(2): 28-37.
2013, Vol. 7 
