| 桥梁加宽中新旧桥面挠度差的控制 |
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| 引用本文： | 杜进生,赵刚,赵永国,惠小荣.桥梁加宽中新旧桥面挠度差的控制[J].长安大学学报(自然科学版),2011(4):58-62,76. |
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| 作者姓名： | 杜进生 赵刚 赵永国 惠小荣 |
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| 作者单位： | 北京交通大学土木建筑工程学院;中交第一公路勘察设计研究院有限公司; |
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| 基金项目： | 中交第一公路勘察设计研究院有限公司科技研发项目(kjyf-2008-2) |
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| 摘 要： | 为减小桥梁加宽施工中交通荷载引起的新旧桥面间的挠度差,采用基于梁格的有限元数值计算方法,研究了交通管制、在新旧桥面间设置临时剪力架、在旧桥下设置临时支撑、分段浇注新旧桥面间的混凝土接缝这4种措施及其组合的应用情况。研究结果表明:通过采取适当的交通管制措施,如关闭与混凝土接缝毗邻车道,能较有效地降低新旧桥面间的变形差,但实际施工中,如果单纯采用该措施,则需要在接缝混凝土浇注后的6~8 h内完全封闭交通;在旧桥桥下设置临时支撑比在新旧桥面间设置临时剪力架更能有效地减小交通荷载作用下新旧桥面间的变形差,但该措施受到桥梁所处位置限制,且成本较高;分节段浇注混凝土接缝亦能减小交通荷载作用下新旧桥面间的变形差,但可能增加施工工期;在4种措施的组合应用方面,以适当的交通管制和在新旧桥面间设置临时剪力架的组合方式较为可行和有效。
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| 关 键 词： | 桥梁工程 桥梁加宽 混凝土接缝 变形 临界曲率 |
Control of deflection difference between existing and new decks during bridge widening |
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| DU Jin-sheng,ZHAO Gang,ZHAO Yong-guo,HUI Xiao-rong.Control of deflection difference between existing and new decks during bridge widening[J].JOurnal of Chang’an University:Natural Science Edition,2011(4):58-62,76. |
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| Authors: | DU Jin-sheng ZHAO Gang ZHAO Yong-guo HUI Xiao-rong |
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| Institution: | DU Jin-sheng1,ZHAO Gang2,ZHAO Yong-guo2,HUI Xiao-rong1(1.School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China,2.CCCC First Highway Consultants Co Ltd,Xi'an 710075,Shaanxi,China) |
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| Abstract: | To induce the deflection difference between existing and new decks in bridge widening construction under traffic load,the grillage finite element method is used to investigate the influence of four methods and their combinations on the deformation of concrete stitches.The four methods are traffic restriction,provision of temporary shear connectors between existing and new decks,provision of temporary supports under existing bridges,and segmental placement of concrete stitches.The results show that slight tr... |
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| Keywords: | bridge engineering bridge widening concrete stitch deformation critical curvature |
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