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| Long-term performance of multi-box composite bridges under transverse prestressing |
| XIANG Yi-qiang1,2, LI Shao-jun1, LIU Li-si1 |
| 1.College of Civil Engineering, Zhejiang University, Hangzhou 310058, China; 2.Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou 310058, China |
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Abstract Taking a typical simply-supported multi-box composite girder bridge as research object, the transverse beam was assumed as multi-span continuous beam which is elastically supported on the longitudinal main girders. Under the assumption of none slippage between concrete plate and steel girder, calculation formula of lateral internal forces, long-term stresses and deformation were deduced considering transverse prestress and shrinkage and creep effect of concrete in the multi-box composite bridge. In addition, theoretical values were compared with FEM results by Midas/Civil. The results show that theoretical values are identical with FEM results. Under long-term load, bridge deflection continuously increases and transverse prestress can decrease long-term additional deformation and variation range of long-term stresses in transverse beam. Results gained by Midas underestimate the influence of concrete shrinkage, creep effect and prestressed tendon relaxation on long-term additional transverse stresses in the multi-box composite bridges．
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Published: 26 December 2015
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横向预应力下多梁式组合小箱梁长期性能
以一典型简支多梁式组合小箱梁桥为研究对象,将横梁近似视作支承在多片主梁上的多跨弹性支承连续梁,在混凝土板和钢梁间无相对滑移的平截面假定下,推导综合考虑混凝土收缩徐变作用的组合小箱梁在横向施加预应力下的横梁内力、横向长期应力和变形的计算公式,并将理论计算值和有限元软件MIDAS计算值对比分析。结果表明,两者吻合良好；在长期荷载作用下,结构挠度不断增加,预应力的施加能降低长期附加变形量以及横梁长期应力变化幅度；同时发现MIDAS会低估混凝土收缩徐变以及预应力筋松弛对这类组合梁桥横向长期附加应力的影响．
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| ［1］ BRADFORD M A. Deflections of composite steel-concrete beams subject to creep and shrinkage ［J］. ACI Structural Journal,1991,88(5)：610-614．
［2］ BRADFORD M A, GILBERT R I. Experiments on composite beams at service loads ［J］. Trans. Inst. Eng.Austr, Civil Eng, 1991, 33(4): 285-291．
［3］ 聂建国, 陶慕轩. 体外预应力钢-混凝土组合梁受力性能的研究现状与展望［J］. 工程力学, 2011, S2: 129-141．
NIE Jian-guo, TAO Mu-xuan. Research status and perspective on externally prestressed steel-concrete composite beams ［J］. Engineering Mechanics, 2011, S2: 129-141．
［4］ 项贻强, 何余良, 刘丽思, 等. 考虑滑移的多梁式组合小箱梁桥荷载横向分布［J］. 哈尔滨工业大学学报, 2012, 44(8): 113-118．
XIANG Yi-qiang, HE Yu-liang, LIU Li-si, et al. Lateral load distribution of multi-box steel-concrete composite girder bridges for considering slipping effect［J］. Journal of Harbin Institute of Technology, 2012, 44(8): 113-118．
［5］ 何余良. 多梁式钢-混凝土组合小箱梁桥受力特性及试验研究［D］. 杭州: 浙江大学, 2014．
HE Yu-liang. Mechanism properties and experimental investigation of multi-beam steel concrete composite girder bridge ［D］. Hangzhou: Zhejiang University, 2014．
［6］ 浙江大学. 一种双向预弯多梁式钢-混凝土小箱梁桥的结构:中国,CN2011204454113［P］. 2012-07-04．
Zhejiang University. Bidirectional pre-bent multi-beam type structure of small steel-concrete box girder bridge: China, CN2011204454113［P］. 2012-07-04．
［7］ 浙江大学. 一种提高多梁式组合小箱梁桥桥面结构横向整体性的方法:中国, CN201110356879.X［P］. 2012-04-11．
Zhejiang University. Method for improving cross integrity of bridge deck structure of multi-girder type combined small box girder bridge: China, CN20111035 6879. X ［P］. 2012-04-11．
［8］ GIUSSANI F, MOLA F. Displacement Method for the long-term analysis of steel-concrete beams with flexible connection ［J］. Journal of structural engineering, 2009, 136(3): 265-274．
［9］ 孙海林,叶列平,陆新征. 钢-混凝土组合梁收缩和徐变的影响分析和计算［J］. 建筑结构学报, 2006, 36(增刊): 8-11．
SUN Hai-lin, YE Lie-ping, LU Xin-zheng. Long term deformation analysis of shrinkage and creep of steel-concrete composite beams ［J］. Journal of Building Structure, 2006, 36(Supplement): 8-11．
［10］ XUE W C, DING M, HE C, et al. Long-term behavior of prestressed composite beams at service loads for one year ［J］. Journal of Structural Engineering, 2008, 134(6): 930-937．
［11］ JTG D62-2004.公路钢筋混凝土及预应力混凝土桥涵设计规范［S］. 北京: 人民交通出版社, 2004．
JTG D62-2004. Code for design of highway reinforced concrete and prestressed concrete bridges and culverts ［S］. Beijing: China Communications Press, 2004．
［12］ STN EN 1994. Eurocode 4: Design of composite steel and concrete structures ［S］.\[S.l.\]: European committee for standardization, 1994．
［13］ 聂建国. 钢-混凝土组合梁长期变形的计算与分析［J］. 建筑结构学报, 1997(1): 42-45．
NIE Jian-guo. Calculation and analysis of the long-term deformation of steel-concrete composite beams［J］. Journal of Building Structures, 1997(1): 42-45．
［14］ 丁敏, 蒋秀根, 剧锦三. 体外预应力钢-混凝土组合梁长期挠度分析［J］. 工程力学, 2010 (9): 94-101．
DING Min, JIANG Xiu-gen, JU Jin-san. Analysis of long-term deflection of externally prestressed steel-concrete composite beams ［J］. Engineering Mechanics, 2010 (9): 94-101．
［15］ 薛伟辰, 孙天荣, 刘婷. 2年持续荷载下城市轻轨预应力钢-混凝土组合梁试验研究［J］. 土木工程学报, 2013, 46(3): 110-118．
XUE Wei-chen, SUN Tian-rong, LIU Ting. Experimental study on prestressed steel-concrete composite beams for urban light rails under sustained loads of two years ［J］. China Civil Engineering Journal, 2013, 46(3): 110-118．
［16］ 项贻强, 李新生, 申永刚,等. 空间梁拱组合式桥梁的分析理论及试验研究 ［J］. 中国公路学报, 2002, 15(1):51-54.
XIANG Yi-qiang, LI Xin-sheng, SHEN Yong-gang, et al. Theory analysis and experimental study of spatial girderand arch combination bridge ［J］. China Journal of Highway and Transport, 2002, 15(1):51-54.
［17］ 项贻强, 杨万里, 潘仁泉, 等. 拱索体系加固的刚架拱桥荷载横向分布［J］. 中国公路学报, 2007, 20(4): 91-95．
XIANG Yi-qiang, YANG Wan-li, PAN Ren-quan, et al. Load lateral distribution of rigid frame arch bridge strengthened with arch and stayed cable system［J］. China Journal of Highway and Transport, 2007, 20(4): 91-95．
［18］ 胡肇滋. 桥跨结构简化分析—荷载横向分布［M］. 北京: 人民交通出版社, 1996．
［19］ 范立础. 桥梁工程［M］. 北京: 人民交通出版社, 2001．
［20］ 顾祥林. 混凝土结构基本原理［M］. 上海: 同济大学出版社, 2004．
［21］ CEB Bulletin No.213-214.CEB-FIP mode code 1990［S］. London: Thomas Telford Services Ltd., 1993．
［22］ DIN 1045 Concrete. reinforced and prestressed concrete structures ［S］. Berlin, Germany: DIN, 2001．
［23］ 吴冲. 现代钢桥(上册)［M］. 北京: 人民交通出版社, 2006. |
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