基于纤维梁模型的钢筋混凝土箱梁非线性分析
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摘要
为了准确模拟钢筋混凝土箱梁的非线性受力性能,采用精细化的三维纤维梁单元模型,基于有限元软件ABAQUS的Standard求解模块,用FORTRAN语言编制了钢筋和混凝土纤维梁单元材料用户子程序,详细介绍了建模过程。以钢筋混凝土简支箱梁为算例,对其进行全过程非线性仿真分析,并与试验结果进行对比,研究配筋率及加载方式对箱梁全过程受力性能的影响。计算结果表明:有限元分析得到的跨中荷载-挠度曲线反映了钢筋混凝土箱梁的受力全过程及破坏形态,且与试验结果吻合良好,验证了本文建模方法的可靠性;配筋率对箱梁的极限承载力影响很大,选择合适的纵筋和箍筋配筋率极为重要;不同加载方式下箱梁的受力性能是有差别的。提出了箱梁全过程受力特性的弯矩-挠度简化计算模型,并与试验结果对比,验证了本文简化计算方法的正确性,为既有桥梁的安全性和可靠度评估提供了简化方法。
In order to accurately simulate the nonlinear mechanical behavior of reinforced concrete box girder,a refined three-dimensional fiber beam element model was adopted in the standard module of ABAQUS software,a user subroutine of rebar and concrete written in FORTRAN language was developed for fiber beam element,a nd the modeling process was introduced in detail.For an example of reinforced concrete simply supported box girder,the whole process nonlinearity was simulated and compared with the experimental results. And the influence of reinforcement ratio and loading modes on the whole process mechanical behavior was studied.The calculation results show that the load-deflection curve obtained with finite element is agreed well with the experimental result, including the force whole process and failure mode, so the modeling method in this paper is reliability.The reinforcement ratio has a great influence on the ultimate bearing capacity, so it is very important to choose the proper reinforcement ratio of the longitudinal bars and stirrups. The mechanical behavior of box girder under different loading modes is different.A simplified calculation model of moment-deflection of box girder is proposed,and the correctness of the method is verified by compared with the test results,which provides a simplified method for the safety and reliability evaluation of existing bridges.
In order to accurately simulate the nonlinear mechanical behavior of reinforced concrete box girder,a refined three-dimensional fiber beam element model was adopted in the standard module of ABAQUS software,a user subroutine of rebar and concrete written in FORTRAN language was developed for fiber beam element,a nd the modeling process was introduced in detail.For an example of reinforced concrete simply supported box girder,the whole process nonlinearity was simulated and compared with the experimental results. And the influence of reinforcement ratio and loading modes on the whole process mechanical behavior was studied.The calculation results show that the load-deflection curve obtained with finite element is agreed well with the experimental result, including the force whole process and failure mode, so the modeling method in this paper is reliability.The reinforcement ratio has a great influence on the ultimate bearing capacity, so it is very important to choose the proper reinforcement ratio of the longitudinal bars and stirrups. The mechanical behavior of box girder under different loading modes is different.A simplified calculation model of moment-deflection of box girder is proposed,and the correctness of the method is verified by compared with the test results,which provides a simplified method for the safety and reliability evaluation of existing bridges.
引文
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[16]林丽霞.钢筋混凝土箱梁非线性分析及剪滞、剪切效应的有限段法研究[D]兰州:.兰州交通大学,2010.
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[2]ZERIS C A,MAHIN S A. Behavior of Reinforced Concrete Structures Subjected to Biaxial Excitation[J].Journal of Structural Engineering,1991,117(9):2657-2673.
[3]SPACONE E,FILIPPOU F C,TAUCER F F. Fiber Beamcolumn Model for Nonlinear Analysis of R/C Frames:Part I.Formulation[J].Earthquake Engineering Structural Dynamics,1996,25(7):711-725.
[4]ZUPAN D,SAJE M.The Linearized Three-dimensional Beam Theory of Naturally Curved and Twisted Beams:the Strain Vectors Formulation[J]. Computer Methods in Applied Mechanics and Engineering,2006,195(33/36):4557-4578.
[5]THAI H T,KIM S E.Second-order Inelastic Analysis of Cable-stayed Bridges[J]. Finite Elements in Analysis and Design,2012,7(53):48-55.
[6]胡郑州,吴明儿.考虑剪切效应三维纤维梁单元的几何非线性增量有限元分析[J].工程力学,2014,31(8):134-143.
[7]庄茁,由小川,廖剑辉,等.基于ABAQUS的有限元分析和应用[M].北京:清华大学出版社,2009.
[8]雷拓,刘伯权,刘锋.基于ABAQUS隐式分析的梁单元材料模型开发应用[J].中南大学学报(自然科学版),2013,44(8):3503-3511.
[9]王强,宋学迪,郝中华,等.基于ABAQUS纤维梁单元的钢筋混凝土柱受力破坏全过程数值模拟[J].土木工程学报,2014,47(12):16-16.
[10]王强,郝中华,宋学迪,等.双向往复加载下钢筋混凝土柱破坏过程的数值模拟[J].沈阳建筑大学学报(自然科学版),2015,31(1):53-61.
[11]ABAQUS Inc. ABAQUS Theory Manual[M]. Providence:Dassault Systemes Simulia Corp,2010.
[12]ABAQUS Inc. ABAQUS Analysis User's Manual[M].Providence:Dassault Systemes Simulia Corp,2011.
[13]曲哲.PQ-fiber使用手册v2. 0[R].北京:清华大学,2012.
[14]SILVIA M,FRANK M,MICHAEL H,et al. Open System for Earthquake Engineering Simulation User Command-language Manual[M].Berkeley:University of California,2006.
[15]王强,朱丽丽,李哲,等.ABAQUS显式分析梁单元的混凝土、钢筋本构模型[J].沈阳建筑大学学报(自然科学版),2013,29(1):56-64.
[16]林丽霞.钢筋混凝土箱梁非线性分析及剪滞、剪切效应的有限段法研究[D]兰州:.兰州交通大学,2010.
[17]中华人民共和国建设部.混凝土结构设计规范:GB 50010—2010[S].北京:中国建筑工业出版社,2002.
[18]李爱群,高振世,张志强.工程结构抗震与防灾[M].南京:东南大学出版社,2012.
[19]王金金.钢筋混凝土构件受弯性能分析与尺寸效应[D].大连:大连理工大学,2013.
[20]周世军.钢筋混凝土箱形梁的极限承载力分析[J].铁道学报,1997,19(2):73-79.
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