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预应力混凝土简支足尺试验梁变形随机分析

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Keywords: 桥梁工程,随机变形,蒙特卡罗模拟,预应力钢筋混凝土,敏感性分析

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Abstract:

?为研究预应力混凝土梁正常使用状态下变形的随机性,对3片跨度为30m的公路预应力混凝土简支梁进行了足尺模型全过程加载试验。利用蒙特卡罗模拟与非线性有限元方法,建立了混凝土结构非线性变形的随机分析模型,并利用偏序相关系数表示敏感性系数;利用试验统计参数与随机分析模型,对试验梁的跨中挠度进行加载全过程随机分析与敏感性分析,试验结果与随机分析结果的对比,证明了随机分析的必要性与正确性。结果表明:跨中弯矩接近开裂弯矩时,跨中挠度的变异性显著增加;混凝土截面开裂前,混凝土弹性模量的敏感性最大,而当混凝土截面开裂后,张拉控制应力的敏感性最大;在施工中,应尽量降低张拉控制应力的变异性。

References

[1]  杜 斌.既有预应力混凝土桥梁结构可靠度与寿命预测研究[D].成都:西南交通大学,2009. DU Bin.Research on Reliability and Remaining Service Life of Exiting Prestressed Concrete Bridge[D].Chengdu:Southwest Jiaotong University,2009.
[2]  1992-1-2,Eurocode 2:Design of Concrete Structures,Part 1-2:General Rules Structure Fire Design[S].
[3]  ACI 318—77,Building Code Requirements for Reinforced Concrete[S].
[4]  SNiP 2.03.01—84,Concrete and Reinforced Concrete Structures[S].
[5]  GB 50010—2010,混凝土结构设计规范[S]. GB 50010—2010,Code for Design of Concrete Structure[S].
[6]  KIM J J,TAHA M M R,NOH H,et al.Reliability Analysis to Resolve Difficulty in Choosing from Alternative Deflection Models of RC Beams[J].Mechanical Systems and Signal Processing,2013,37:240-252.
[7]  CHOI B S,SCANLON A,JOHNSON P A.Monte Carlo Simulation of Immediate and Time-dependent Deflections of Reinforced Concrete Beams and Slabs[J].ACI Structural Journal,2004,101(5):633-641.
[8]  BLJUGER E.Models of R.C.Structures for Probabilistic Serviceability Analysis[J].Computers & Structures,1998,67:19-27.
[9]  NOWAK A S,COLLINS K R.Reliability of Structures[M].2nd ed.Boca Raton:CRC Press,2012.
[10]  NOWAK A S.Calibration of LRFD Bridge Code[J].Journal of Structural Engineering,1995,121(8):1245-1251.
[11]  GB/T 50283—1999,公路工程结构可靠度设计统一标准[S]. GB/T 50283—1999,Unified Standard for Reliability Design of Highway Engineering Structures[S].
[12]  马 坤,向天宇,赵人达,等.高速铁路钢筋混凝土拱桥长期变形的随机分析[J].土木工程学报,2012,45(11):141-146 MA Kun,XIANG Tian-yu,ZHAO Ren-da,et al.Stochastic Analysis of Long-term Deformation of Reinforced Concrete Arch Bridges for High-speed Railways[J].China Civil Engineering Journal,2012,45(11):141-146
[13]  YANG I H.Prediction of Time-dependent Effects in Concrete Structures Using Early Measurement Data[J].Engineering Structures,2007,29:2701-2710.
[14]  AL-HARTHY A S,FRANGOPOL D M.Reliability Assessment of Prestressed Concrete Beams[J].Journal of Structural Engineering,1994,120:180-199.
[15]  CHENG J,CAI C S,XIAO R C.Probabilistic Response Analysis of Cracked Prestressed Concrete Beams[J].Advances in Structural Engineering,2007,10(1):1-10.

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