混合式钢混组合梁斜拉桥收缩徐变灰色分析
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摘要
为了研究混凝土收缩徐变对混合式钢混组合梁斜拉桥结构线形的影响,根据工程实际建立全桥空间有限元模型,基于AEMM-FEM法和灰色关联度方法分析混合式钢混组合梁斜拉桥的收缩徐变效应。结果表明:在收缩徐变的作用下,边跨混凝土主梁竖向变形微小,主跨钢混组合梁跨中下挠变形较大,随着运营时间的增加组合梁挠度不断发展。提高环境相对湿度、桥面板预制龄期和混凝土抗压强度后,组合梁的挠度值和塔顶偏移值均有所减小。由灰色关联度序列可知,混凝土抗压强度是影响组合梁线形的最敏感因素,环境相对湿度、混凝土收缩龄期和桥面板预制龄期的影响依次递减。塔顶变形受混凝土收缩龄期的影响最为严重,其次是混凝土抗压强度的影响。研究结论对减轻混合式钢混组合梁斜拉桥运营期间收缩徐变影响有一定的意义。
In order to study the effects of concrete shrinkage and creep on the line shape of the hybrid steel-concrete composite girder cable-stayed bridge, a full-bridge spatial finite element model was established according to the engineering practice. Based on AEMM-FEM method and gray correlation degree method, the effects of concrete shrinkage and creep of hybrid steel-concrete composite girder cable-stayed bridge were analyzed. The results show that the vertical deformation of the concrete girder is small due to the effects of shrinkage and creep, while the large deflection occurs in the steel-concrete composite girder and develops with the increase of the operation time. Increasing the relative humidity of the environment, the precast age of the bridge deck and the concrete compressive strength, the deflection of the composite girder and the longitudinal displacement of the top of the pylon are reduced. According to the gray correlation sequence, the compressive strength of concrete is the most sensitive factor affecting the line shape of the composite girder, while the effects of environmental relative humidity, shrinkage age of concrete and the precast age of the bridge deck are successively decreasing. The longitudinal displacement of the top of the pylon is most affected by the shrinkage age of concrete, followed by the compressive strength of the concrete. The research conclusion is of significance for alleviating the effects of shrinkage and creep during the operation of hybrid steel-concrete composite girder cable-stayed bridges.
In order to study the effects of concrete shrinkage and creep on the line shape of the hybrid steel-concrete composite girder cable-stayed bridge, a full-bridge spatial finite element model was established according to the engineering practice. Based on AEMM-FEM method and gray correlation degree method, the effects of concrete shrinkage and creep of hybrid steel-concrete composite girder cable-stayed bridge were analyzed. The results show that the vertical deformation of the concrete girder is small due to the effects of shrinkage and creep, while the large deflection occurs in the steel-concrete composite girder and develops with the increase of the operation time. Increasing the relative humidity of the environment, the precast age of the bridge deck and the concrete compressive strength, the deflection of the composite girder and the longitudinal displacement of the top of the pylon are reduced. According to the gray correlation sequence, the compressive strength of concrete is the most sensitive factor affecting the line shape of the composite girder, while the effects of environmental relative humidity, shrinkage age of concrete and the precast age of the bridge deck are successively decreasing. The longitudinal displacement of the top of the pylon is most affected by the shrinkage age of concrete, followed by the compressive strength of the concrete. The research conclusion is of significance for alleviating the effects of shrinkage and creep during the operation of hybrid steel-concrete composite girder cable-stayed bridges.
引文
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[14]刘超.大跨度混合式结合梁斜拉桥地震响应与减震研究[J].武汉:武汉理工大学,2014.LIU C. Seismic response and shock absorption research of longspan hybrid beam cable-stayed bridge[D]. Wuhan:Wuhan University of Technology, 2014.
[15]QARRA A H. The dee estuary bridge-control of geometry during construction[J]. Proceedings of the Institution of Civil Engineers Civil Engineering, 1999, 132(1):31-39.
[16]李建慧,李爱群,周广盼.混凝土自锚式悬索桥收缩徐变效应分析[J].防灾减灾工程学报,2016(6):906-912.LI J H, LI A Q, ZHOU G P. Shrinkage and creep effects analysis of concrete self-anchored suspension bridge[J]. Journal of Disaster Prevention and Mitigation Engineering, 2016(6):906-912.
[17]秦煜,刘来君,李青良,等.混凝土桥梁收缩特性影响因素敏感性分析[J].公路工程,2014,39(6):20-24.QIN Y, LIU L J, LI Q L, et al. Sensitivity analysis for concrete bridge shrinkage[J]. Highway Engineering, 2014, 39(6):20-24.
[18]苏成,陈兆栓,徐郁峰,等.预应力混凝土斜拉桥收缩徐变效应的概率分析[J].华南理工大学学报(自然科学版),2012,40(7):8-14.SU C, CHEN Z S, XU Y F, et al. Probability analysis of shrinkage and creep effect of prestressed concrete cable-stayed bridges[J].Journal of South China University of Technology(Natural Science Edition), 2012, 40(7):8-14.
[19]陈志波,简文彬.边坡稳定性影响因素敏感性灰色关联分析[J].防灾减灾工程学报,2006,26(4):473-477.CHEN Z B, JIAN W B. Sensitivity analysis of slopes stability based on grey correlation analysis[J]. Journal of Disaster Prevention and Mitigation Engineering, 2006, 26(4):473-477.
[2]陈亮,邵长宇.结合梁斜拉桥混凝土收缩徐变影响规律[J].桥梁建设,2015,45(1):74-78.CHEN L, SHAO C Y. Influential laws of concrete shrinkage and creep of composite girder cable-stayed bridge[J]. Bridge Construction, 2015, 45(1):74-78.
[3]栾兆健,贾艳敏.预应力混凝土小箱梁预应力阶段预应力损失分析[J].森林工程,2013,29(6):120-122.LUAN Z J, JIA Y M. The analysis of post-tensioned prestressed loss for small box girder[J]. Forest Engineering, 2013, 29(6):120-122.
[4]BAZANT Z P, BAWEJA S. Justification and refinements of model B3 for concrete creep and shrinkage 1. statistics and sensitivity[J].Materials&Structures, 1995, 28(7):415-430.
[5]丁文胜,吕志涛,孟少平,等.混凝土收缩徐变预测模型的分析比较[J].桥梁建设,2004(6):13-16.DING W S, LU Z T, MENG S P, et al. Analysis and comparison of prediction models for concrete shrinkage and creep[J]. Bridge Construction, 2004(6):13-16.
[6]GARA F, RANZI G, LEONI G. Time analysis of composite beams with partial interaction using available modelling techniques:A comparative study[J]. Journal of Constructional Steel Research,2006, 62(9):917-930.
[7]ZVOLAINEK L, TERZIJSKI I. Relaxation of structural concrete due to its shrinkage in terms of age-adjusted effective modulus method[J]. Key Engineering Materials, 2017, 737:471-476.
[8]樊健生,聂鑫,李全旺.考虑收缩、徐变及开裂影响的组合梁长期受力性能研究(Ⅱ)—理论分析[J].土木工程学报,2009,42(3):16-22.FAN J S, NIE X, LI Q W. Long-term behavior of composite beams with shrinkage, creep and cracking(Ⅱ):theoretical analysis[J].China Civil Engineering Journal, 2009, 42(3):16-22.
[9]温庆杰,叶见曙.钢-混凝土组合梁的收缩徐变效应分析[J].工业建筑,2006,36(s1):492-495.WEN Q J, YE J S. Shrinkage and creep effects of steel-concrete composite beams[J]. Industrial Construction, 2006, 36(s1):492-495.
[10]RANZI G, BRADFORD M A. Analytical solutions for the timedependent behavior of composite beams with partial interaction[J].International Journal of Solids&Structures, 2006, 43(13):3770-3793.
[11]樊健生,聂建国,王浩.考虑收缩、徐变及开裂影响的组合梁长期受力性能研究(I)——试验及计算[J].土木工程学报,2009,42(3):8-15.FAN J S, NIE J G, WANG H. Long-term behavior of composite beams with creep, shrinkage and cracking(I):experiment and calculation[J]. China Civil Engineering Journal, 2009, 42(3):8-15.
[12]刘沐宇,李倩,黄岳斌,等.港珠澳大桥钢-混组合连续梁桥超长时间收缩徐变效应[J].中国公路学报,2016,29(12):60-69.LIU M Y, LI Q, HUANG Y B, et al. Ultra-long time performance of steel-concrete composite continuous beam in Hong Kong-ZhuhaiMacao bridge with creep and shrinkage of concrete slabs[J].China Journal of Highway and Transport, 2016, 29(12):60-69.
[13]高翔,周尚猛,陈开利.混合梁斜拉桥钢混结合段试验研究技术新进展[J].钢结构,2015,30(6):1-4.GAO X, ZHOU S M, CHEN K L. New development of the experimental research on steel-concrete composite beam cablestayed bridge[J]. Steel Construction, 2015, 30(6):1-4.
[14]刘超.大跨度混合式结合梁斜拉桥地震响应与减震研究[J].武汉:武汉理工大学,2014.LIU C. Seismic response and shock absorption research of longspan hybrid beam cable-stayed bridge[D]. Wuhan:Wuhan University of Technology, 2014.
[15]QARRA A H. The dee estuary bridge-control of geometry during construction[J]. Proceedings of the Institution of Civil Engineers Civil Engineering, 1999, 132(1):31-39.
[16]李建慧,李爱群,周广盼.混凝土自锚式悬索桥收缩徐变效应分析[J].防灾减灾工程学报,2016(6):906-912.LI J H, LI A Q, ZHOU G P. Shrinkage and creep effects analysis of concrete self-anchored suspension bridge[J]. Journal of Disaster Prevention and Mitigation Engineering, 2016(6):906-912.
[17]秦煜,刘来君,李青良,等.混凝土桥梁收缩特性影响因素敏感性分析[J].公路工程,2014,39(6):20-24.QIN Y, LIU L J, LI Q L, et al. Sensitivity analysis for concrete bridge shrinkage[J]. Highway Engineering, 2014, 39(6):20-24.
[18]苏成,陈兆栓,徐郁峰,等.预应力混凝土斜拉桥收缩徐变效应的概率分析[J].华南理工大学学报(自然科学版),2012,40(7):8-14.SU C, CHEN Z S, XU Y F, et al. Probability analysis of shrinkage and creep effect of prestressed concrete cable-stayed bridges[J].Journal of South China University of Technology(Natural Science Edition), 2012, 40(7):8-14.
[19]陈志波,简文彬.边坡稳定性影响因素敏感性灰色关联分析[J].防灾减灾工程学报,2006,26(4):473-477.CHEN Z B, JIAN W B. Sensitivity analysis of slopes stability based on grey correlation analysis[J]. Journal of Disaster Prevention and Mitigation Engineering, 2006, 26(4):473-477.