装配式先张工字梁模拟和分析
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摘要
采用ABAQUS软件,建立了先张法折线预应力工字梁精细模型,研究了普通钢筋对工字梁受力性能的影响,讨论了转向器拉杆对折点部位局部应力的影响。结果表明:计算的梁体应力及预应力损失和测试结果一致,建立的工字梁精细模型合理有效;不考虑普通钢筋影响将使梁体竖向变形增加14%,纵向变形增加11%,混凝土应力增加11%;转向器竖向拉杆能显著减缓钢束折点处的应力集中作用,钢束预应力损失随高度增加而呈线性减小;折线钢束预应力损失沿梁长变化显著,呈折线分布趋势。
To study the influence of conventional bars on the mechanical behavior of the flanged beam,weestablished a refined numerical model of fold-line pretensioned prestressed flanged beam using the ABAQUSsoftware. The influence of steering gear bolts on the local pressure of break points was investigated. The resultsdemonstrate that the calculated beam stress and loss of prestress ware consistent with the test results,whichindicates that the established refined model is reasonable and effective. The negligence of the influence ofconventional bars makes the vertical deformation,the longitudinal deformation and the stress of beam increaseby 14%,11% and 11% respectively. It is also found that the stress concentration effects of break points can beattenuated significantly by the steering gear bolts,the loss of prestress linearly decreases with increasing height.and the loss of prestress of fold-line steel strand changes significantly along the longitudinal direction,tending toa fold-line distribution.
To study the influence of conventional bars on the mechanical behavior of the flanged beam,weestablished a refined numerical model of fold-line pretensioned prestressed flanged beam using the ABAQUSsoftware. The influence of steering gear bolts on the local pressure of break points was investigated. The resultsdemonstrate that the calculated beam stress and loss of prestress ware consistent with the test results,whichindicates that the established refined model is reasonable and effective. The negligence of the influence ofconventional bars makes the vertical deformation,the longitudinal deformation and the stress of beam increaseby 14%,11% and 11% respectively. It is also found that the stress concentration effects of break points can beattenuated significantly by the steering gear bolts,the loss of prestress linearly decreases with increasing height.and the loss of prestress of fold-line steel strand changes significantly along the longitudinal direction,tending toa fold-line distribution.
引文
[1]黄文雄.基于新型弯起器的折线配筋先张梁力学性能研究[D].武汉:华中科技大学,2012.
[2]邵旭东,顾安邦.桥梁工程[M].北京:人民交通出版社,2007.
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[4]王新宇.折线先张法预应力混凝土箱梁受力性能及工程应用研究[D].郑州:郑州大学,2010.
[5]邵莲芬.先张法折线形预应力筋混凝土梁受力性能的数值分析[D].郑州:郑州大学,2006.
[6]张海龙,代筠杰,郑明万.先张法折线预应力混凝土梁的仿真分析[J].华中科技大学学报(自然科学版),2010,38(9):98-100.
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[8]黄文雄,谭利英.折线配筋先张梁中弯起器的模拟及其对局部应力的影响分析[J].中外公路,2012,32(5):132-135.
[9]刘立新,胡丹丹,于秋波,等.先张法折线形预应力梁钢绞线摩擦损失试验研究[J].郑州大学学报(工学版),2006,27(4):6-9.
[10]NANNI A,TANIGAKI M.Pretensioned prestressed concrete members with bonded fiber reinforced plastic tendons:development and flexural bond lengths[J].ACI Structural Journal,1992,89(4):433-441.
[11]刘立新,安鸿飞,于秋波,等.淮河大桥35 m先张折线形箱梁预应力损失的研究[J].郑州大学学报(工学版),2007,28(4):12-15.
[12]单成林.综合施加预应力法加固钢筋混凝土板桥理论及试验[J].中国公路学报,2013,26(1):67-73.
[13]汪小林,刘立新.折线配筋先张梁疲劳性能试验[J].华中科技大学学报(自然科学版),2010,38(5):113-116.
[14]徐新瑞.折线形先张法预应力混凝土箱梁受力性能的分析[D].郑州:郑州大学,2010.
[15]黄建华,彭浪,朱永涛.先张法预应力混凝土波形板桩力学性能研究[J].地下空间与工程学报,2018,14(3):688-696.
[16]熊锦鹏.折线先张法Bulb-T梁张拉台座设计与应用[J].市政技术,2018,36(5):70-73.
[2]邵旭东,顾安邦.桥梁工程[M].北京:人民交通出版社,2007.
[3]杨庆国,易志坚,刘占芳.混张工艺制作先张折线预应力混凝土构件的设想[J].桥梁建设,2005,35(4):79-81.
[4]王新宇.折线先张法预应力混凝土箱梁受力性能及工程应用研究[D].郑州:郑州大学,2010.
[5]邵莲芬.先张法折线形预应力筋混凝土梁受力性能的数值分析[D].郑州:郑州大学,2006.
[6]张海龙,代筠杰,郑明万.先张法折线预应力混凝土梁的仿真分析[J].华中科技大学学报(自然科学版),2010,38(9):98-100.
[7]HWAN O B,SUNG K E,CHEOL C Y.Theoretical analysis of transfer lengths in pretensioned prestressed concrete members[J].Journal of Engineering Mechanics,2006,132(10):1057-1066.
[8]黄文雄,谭利英.折线配筋先张梁中弯起器的模拟及其对局部应力的影响分析[J].中外公路,2012,32(5):132-135.
[9]刘立新,胡丹丹,于秋波,等.先张法折线形预应力梁钢绞线摩擦损失试验研究[J].郑州大学学报(工学版),2006,27(4):6-9.
[10]NANNI A,TANIGAKI M.Pretensioned prestressed concrete members with bonded fiber reinforced plastic tendons:development and flexural bond lengths[J].ACI Structural Journal,1992,89(4):433-441.
[11]刘立新,安鸿飞,于秋波,等.淮河大桥35 m先张折线形箱梁预应力损失的研究[J].郑州大学学报(工学版),2007,28(4):12-15.
[12]单成林.综合施加预应力法加固钢筋混凝土板桥理论及试验[J].中国公路学报,2013,26(1):67-73.
[13]汪小林,刘立新.折线配筋先张梁疲劳性能试验[J].华中科技大学学报(自然科学版),2010,38(5):113-116.
[14]徐新瑞.折线形先张法预应力混凝土箱梁受力性能的分析[D].郑州:郑州大学,2010.
[15]黄建华,彭浪,朱永涛.先张法预应力混凝土波形板桩力学性能研究[J].地下空间与工程学报,2018,14(3):688-696.
[16]熊锦鹏.折线先张法Bulb-T梁张拉台座设计与应用[J].市政技术,2018,36(5):70-73.