基于壳梁组合单元预应力混凝土梁非线性响应
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摘要
基于壳梁组合(SBC)单元,建立了预应力混凝土T梁非线性分析模型,并对其进行了破坏全过程研究,对梁体刚度折减、预应力筋应力重分布规律等进行了分析.基于分层壳单元和梁单元计算模式,对预应力筋采用SBC单元模拟,有效地模拟了预应力筋的空间预应力作用,对普通钢筋和混凝土采用分层壳单元模拟.采用Owen准则等描述了预应力混凝土T梁的屈服等材料非线性效应,并研制了相应的非线性计算程序.研究结果表明,该方法的计算结果与试验梁的试验结果吻合良好,非线性SBC单元方法用于预应力混凝土T梁分析是合适的,为此类工程薄壁结构的评定分析提供了一种较为有效的计算方法.
With the nonlinear shell-beam composite(SBC)element,the nonlinear analysis model of prestressed concrete T beam was established and the whole failure process was studied.The stiffness reduction and stress redistribution of T beam were analyzed.Based on the layered shell element and the beam element calculation model, the prestressed reinforcement was simulated by the SBC element,and the ordinary steel and concrete were simulated by the layered shell element. The material nonlinearity of prestressed concrete T beams was considered reasonably through Owen criterion and others.The spatial prestressing effect of the prestressed steel bar was simulated effectively and the corresponding nonlinear calculation program was developed.The calculation results of this method are in good agreement with the experimental results of the test beam,which shows that the nonlinear SBC element method is proper for the analysis of the structure.It provides an effective method for evaluating and studying this kind of thin-walled structures.
With the nonlinear shell-beam composite(SBC)element,the nonlinear analysis model of prestressed concrete T beam was established and the whole failure process was studied.The stiffness reduction and stress redistribution of T beam were analyzed.Based on the layered shell element and the beam element calculation model, the prestressed reinforcement was simulated by the SBC element,and the ordinary steel and concrete were simulated by the layered shell element. The material nonlinearity of prestressed concrete T beams was considered reasonably through Owen criterion and others.The spatial prestressing effect of the prestressed steel bar was simulated effectively and the corresponding nonlinear calculation program was developed.The calculation results of this method are in good agreement with the experimental results of the test beam,which shows that the nonlinear SBC element method is proper for the analysis of the structure.It provides an effective method for evaluating and studying this kind of thin-walled structures.
引文
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[2]方志,杨剑.预应力CFRP筋混凝土T梁受力性能试验研究[J].建筑结构学报,2005,26(5):66.FANG Zhi,YANG Jian.Experimental study on behavior of concrete T beam prestressed with CFRP tendons[J].Journal of Building Structures,2005,26(5):66.
[3]张剑,周储伟,俞博,等.预应力高性能混杂纤维增强布加固HPC梁的DNLC单元研究[J].复合材料学报,2017,34(5):1152.ZHANG Jian,ZHOU Chuwei,YU Bo,et al.Research on DNLC element for HPC beams strengthened with high performance prestressed HFRP sheet[J].Acta Materiae Compositae Sinica,2017,34(5):1152.
[4]卢亦焱,胡玲,梁鸿骏,等.CFRP布与钢板复合加固的钢筋混凝土梁受弯疲劳性能试验研究[J].建筑结构学报,2015,36(11):64.LU Yiyan,HU Ling,LIANG Hongjun,et al.Experimental research on flexural fatigue behavior of RC beams strengthened with combination of CFRP and steel plates[J].Journal of Building Structures,2015,36(11):64.
[5]WEN Q J.Long-term effect analysis of prestressed concrete box-girder bridge widening[J].Construction and Building Materials,2011,25(4):1580.
[6]张剑,叶见曙,王景全,等.预应力混杂碳/玻璃(C/G)纤维布加固RC梁的应力重分布[J].交通运输工程学报,2017,17(1):45.ZHANG Jian,YE Jianshu,WANG Jingquan,et al.Stress redistribution of RC beams strengthened with prestressed hybrid carbon/glass(C/G)fiber cloth[J].Journal of Traffic and Transportation Engineering,2017,17(1):45.
[7]FRAGIACOMO M,AMADIO C,MACORINI M L.Finiteelement model for collapse and long-term analysis of steelconcrete composite beams[J].Journal of Structural Engineering,2004,130(3):489.
[8]张宇锋.沪宁高速公路扩建工程桥梁极限状态实桥试验研究试验[R].南京:江苏省交通科学研究院,2006.ZHANG Yufeng.Test and study on the ultimate state of the bridge in the expansion project of Hu-Ning Expressway[R].Nanjing:Jiangsu Academy of traffic Sciences,2006.
[9]叶见曙,张剑,黄剑峰.预应力混凝土多T梁桥的极限承载力[J].东南大学学报(自然科学版),2009,39(1):106.YE Jianshu,ZHANG Jian,HUANG Jianfeng.Analysis of ultimate loads of prestressed concrete multi-T girder bridge[J].Journal of Southest University(Natural Science Edition),2009,39(1):106.
[10]WENDEL M S,RICHARD E.Nonlinear FE analysis of steelconcrete composite structures[J].Journal of Structural Engineering,2000,126(6):662.
[11]张峰,叶见曙,徐向锋.预应力混凝土梁非线性分析单元模型[J].交通运输工程学报,2007,7(5):68.ZHANG Feng,YE Jianshu,XU Xiangfeng.Nonlinear analysis element model of prestressed concrete beam[J].Journal of Traffic and Transportation Engineering,2007,7(5):68.
[12]杨耀铨.跨径25米的装配式后张法预应力混凝土简支梁静载试验报告[R].北京:交通部第二公路勘察设计院,1979.YANG Yaoquan.Report on static load test of prestressed concrete simple supported beam with 25 meters span[R].Beijing:Second Highway Survey and Design Institute of Ministry of communications,1979.
[13]汪光庐.整体多片式T梁结构空间分析[D].上海:同济大学,2002.WANG Guanglu.An analysis of the cross sectional frame effect of monolithic multi-piece T beam[D].Shanghai:Tongji University,2002.
[14]DENG L Z,MICHEL G,ALES Z,et al.Nonlinear flexural behavior of prestressed concrete girder bridges[J].Journal of Bridge Engineering,2001,6(4):276.
[15]WONSEOK C,ELISA D S.Nonlinear finite-element analysis of composite steel girder bridges[J].Journal of Structural Engineering,2005,131(2):304.
[16]THABET A,HALDANE D.Three-dimensional simulate-on of nonlinear response of reinforced concrete members subjected to impact-loading[J].Journal of Structure.2000,97(5):689.
[17]SHEN D J,DENG S C,ZHANG J Y,et al.Behavior of reinforced concrete box beam with initial cracks repaired with basalt fiber-reinforced polymer sheet[J].Journal of Reinforced Plastics and Composites,2015,34(18)1540.
[18]吕西林,金国芳,吴晓涵.钢筋混凝土结构非线性有限元理论与应用[M].上海:同济大学,1999.LXilin,JIN Guofang,WU Xiaohan.Nonlinear finite element theory and application of reinforced concrete structure[M].Shanghai:Tongji University press,1999.
[19]王家林.钢筋混凝土结构空间有限元分析的体梁组合单元[J].工程力学,2002,19(6):131.WANG Jialin.A brick-beam combination element for threedimensional finite element analysis of reinforced concrete structures[J].Engineering Mechanics,2002,19(6):131.
[20]YE X,ZHANG J,MA Y,et al.Study on mechanical properties of the continuous U-shaped beam[J].Advanced Materials Research,2014(889-890):1425.
[21]汪锋,苏林,张剑,等.预应力混凝土刚构U形梁的受力性能研究[J].新技术新工艺,2017,37(11):32.WANG Feng,SU Lin,ZHANG Jian,et al.Analysis of mechanical performances of rigid frame U shaped beam[J].New Technology&New Process,2017,37(11):32.