横向大悬臂连续箱梁结构分析与模型试验
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摘要
预应力混凝土横向大悬臂连续箱梁结构其外形优美、施工方便、线条美观轻巧,在桥梁上得到广泛应用;特别是由于其桥下净空大,在新建城市桥梁时,采用悬臂顶帽,占地少,可以缩小墩台宽度,增加桥下净空,降低造价。论文以西安市大兴路立交D2联预应力混凝土横向大悬臂连续箱梁为工程背景,D2联箱梁为匝道的汇合处,为变宽度异形箱梁,桥面宽度从2542cm渐变到3900cm。其最大悬臂宽度(支撑中心至箱梁最外缘距离)为1540.8cm,在国内比较罕见。由于悬臂较长,其混凝土结构呈三向受力状态,应力分布比较复杂。在国内,对采用如此大悬臂以及类似现浇箱梁施加预应力的施工方法可供借鉴的成果较少。为了有效地检验设计,确保大兴路立交桥梁在施工期间的安全和施工的顺利进行,保障竣工后结构处于良好的运营状态,进行缩尺模型试验研究并对其安全性进行评价很有必要。
本文在室内模型的基础上,从以下几方面进了研究:
(1)按相似准则制作了室内模型,模型设计主要包括一般构造设计、普通钢筋设计、预应力钢筋设计、局部承压及锚下钢筋设计等几个方面;
(2)模拟施工过程和成桥运营受力状况进行室内加载试验;
(3)对模型采用三种计算方法(梁格法、板壳法和实体单元法)进行分析,并与实验结果进行对比分析,从而确定适合结构的计算方法,在该方法的基础上,借助大型通用有限元程序对该模型应力及其分布规律进行仿真分析;
(4)通过模型试验结果与计算结果的对比分析从而评价结构的安全性能;
(5)用实验中得到验证的分析方法对实桥进行仿真分析从而评价结构的安全性能。
最后,本文对所做的研究工作进行了总结,给出了研究中的一些结论,并指出了在进一步研究中亟待解决的问题。其中得到的研究成果可以作为类似结构的模型设计、模型实验的参考依据,具有重要的工程实用价值。
The outline of the continous transverse long cantilever box girder of prestressed concrete is beautiful, the structure is simple, the construction is convenient, so the structure is widespread in the bridge engineering. This structure has many virtues, such as taking up little land, reducing the width of pier or abutment, increasing the space under the bridge. The second prestressed concrete continous box girder of DaXin is the background of this paper. The structure is located in the junction of two interchange loop, the width of the box girder varies from 2542cm to 3900cm. The longest cantilever is 1540.8 centimeter (structure center to outflow boundary), which is rare in domestic. Because the concrete is in the three-dimensional stress condition, the stress distribution is quite complex. In domestic, By for there are few achievements for the long cantilever girder and the cast-in-situ construction. In order to examine the design effectively, and to insure the security in the course of construction and its service period. A model of this structure has been made to appraise its sercurity.
The studies has been listed as follows.
(1) The model of the structure was made according principal of similitude. which include designing of figure, designing of prestressed reinforcement, designing of nonprestressed reinforcement, designing of local compression place and reinforcement under the anchor device,
(2) The load test was carryid out indoors imitating the construction process and its stress condition during the service period,
(3) The finite element model was set up by using grillage, slab element and 3-D solid element, the result of which were contrasted to the experiment, and then the suitable method was determined. The a 3-D solid element model was set up for analyzing stress of the model and the distribution rule of the stress by using finite element program.
(4) By contrasting the experiment and calculation results, security characteristics had been evaluated.
(5) By using the method, the original bridge had been evaluated.
Finally, this paper summarized all the study work and drew some conclusions, and the further research problems are indicated. These laws can be used as the reference of model designing and model experiment of the similar structure. It's very important for engineering application.
本文在室内模型的基础上,从以下几方面进了研究:
(1)按相似准则制作了室内模型,模型设计主要包括一般构造设计、普通钢筋设计、预应力钢筋设计、局部承压及锚下钢筋设计等几个方面;
(2)模拟施工过程和成桥运营受力状况进行室内加载试验;
(3)对模型采用三种计算方法(梁格法、板壳法和实体单元法)进行分析,并与实验结果进行对比分析,从而确定适合结构的计算方法,在该方法的基础上,借助大型通用有限元程序对该模型应力及其分布规律进行仿真分析;
(4)通过模型试验结果与计算结果的对比分析从而评价结构的安全性能;
(5)用实验中得到验证的分析方法对实桥进行仿真分析从而评价结构的安全性能。
最后,本文对所做的研究工作进行了总结,给出了研究中的一些结论,并指出了在进一步研究中亟待解决的问题。其中得到的研究成果可以作为类似结构的模型设计、模型实验的参考依据,具有重要的工程实用价值。
The outline of the continous transverse long cantilever box girder of prestressed concrete is beautiful, the structure is simple, the construction is convenient, so the structure is widespread in the bridge engineering. This structure has many virtues, such as taking up little land, reducing the width of pier or abutment, increasing the space under the bridge. The second prestressed concrete continous box girder of DaXin is the background of this paper. The structure is located in the junction of two interchange loop, the width of the box girder varies from 2542cm to 3900cm. The longest cantilever is 1540.8 centimeter (structure center to outflow boundary), which is rare in domestic. Because the concrete is in the three-dimensional stress condition, the stress distribution is quite complex. In domestic, By for there are few achievements for the long cantilever girder and the cast-in-situ construction. In order to examine the design effectively, and to insure the security in the course of construction and its service period. A model of this structure has been made to appraise its sercurity.
The studies has been listed as follows.
(1) The model of the structure was made according principal of similitude. which include designing of figure, designing of prestressed reinforcement, designing of nonprestressed reinforcement, designing of local compression place and reinforcement under the anchor device,
(2) The load test was carryid out indoors imitating the construction process and its stress condition during the service period,
(3) The finite element model was set up by using grillage, slab element and 3-D solid element, the result of which were contrasted to the experiment, and then the suitable method was determined. The a 3-D solid element model was set up for analyzing stress of the model and the distribution rule of the stress by using finite element program.
(4) By contrasting the experiment and calculation results, security characteristics had been evaluated.
(5) By using the method, the original bridge had been evaluated.
Finally, this paper summarized all the study work and drew some conclusions, and the further research problems are indicated. These laws can be used as the reference of model designing and model experiment of the similar structure. It's very important for engineering application.
引文
[1]中华人民共和国建设部《城市桥梁设计荷载标准》(CJJ77-98)
[2]中华人民共和国交通部《公路桥涵施工技术规范》(JTJ041-2000)
[3]西安市大兴路立交工程D2联现浇梁设计施工图(2004.9)
[4]伍海山,李德建.并排大悬臂变截面箱梁支承桥面系的空间分析与试验研究.长沙铁道学院学报,2002年06期
[5]陈硕苇蒋志贤.大跨度悬挑结构的设计与试验.结构工程师,1999年02期
[6]林树,甘良绪,高作平.钢筋混凝土悬臂梁粘钢加固试验研究.武汉水利电力学院学报,1993年12期
[7]张士铎.悬臂行车道板计算理论综述.重庆交通学院学报,2001年2期
[8]叶爱君,袁万城,胡世德.预应力混凝土大悬臂延性性能试验研究.结构工程师,1996年1期
[9]伍海山,李德建.并排大悬臂变截面箱梁支承桥面系的空间分析与试验研究,2002年2期
[10]郑振,谷音.大悬臂变截面箱梁剪力滞效应分析.福州大学学报(自然科学版)2001年2期
[11]罗许国,李朝奎.大悬臂钢脊骨梁结构模型剪力滞效应探讨.湘潭师范学院学报,2004年1期
[12]T.I.Campel and L.Chitnuyanondh.Horizontally Curved continuous post-ten-sioned Concrete Beams.PCI journal,March-April 1975,(3):45-52
[13]T.L Compbel.Design Consideration in Horizontall-Curved prestressed Concrete Bridge Structures.International Conference on Short and Medium Span Bridges,Toronto,1982:135-143
[14]李新平.大悬臂薄壁钢挑梁的稳定计算.华南理工大学学报(自然科学版)2002年6期
[15]罗许国,戴公连.大悬臂桥面板钢脊骨梁结构模型剪力滞效应有限元分析.长沙铁道学院学报,2002年1期
[16]常传利,白海莹,王辉.三跨连续箱梁斜弯桥静力试验和分析.黑龙江交通科技,1999年02期
[17]孙全胜,王学松.连续箱梁斜弯桥有机玻璃模型静力试验和分析.东北公路,2002年04期
[18]贺栓海等.弯桥实用计算方法研究.长安大学研究报告,2001年
[19]孙广华.曲线梁桥计算.人民交通出版社.1995[20]
[20]高岛春生著.张德礼译.曲线梁桥.中国建筑工业出版社,1994年
[21]李惠生,张罗溪.曲线梁结构分析.中国铁道出版社,1992年
[22]邵容光等.混凝土弯梁桥.人民交通出版社,1994年
[23]Ont.Ministry Transportation and Communication.Ontario Highway Bridge Design Code,1983
[24]彭大文,颜海.曲线梁桥剪力滞系数实用计算法.福州大学学报(自然科学版),2001年12期
[25]杨允文,宋启根.曲线箱梁剪力滞效应及有效宽度的理论分析.东南大学学报,1994年05期
[26]宋一凡.公路桥梁荷载试验与结构评定.人民交通出版社,2002年
[27]张如一,陆跃桢.试验应力分析.机械工业出版社,1981
[28]徐日旭,王博仪,赵家奎.桥梁检验.人民交通出版社,1992年
[29]刘波.大曲率连续钢箱梁剪力滞效应试验研究.硕士学位论文,2004年6月
[30]吴宁.城市立交桥曲线异形箱梁的空间分析.硕士学位论文,2004年6月
[31]Meyer.C.Analysis and Design of Curved Box Girder Bridge Strucures and Material.Research Department of Civil Engineering,Division of Structural Engineering and Structural Mechanics,Report No.UC.SECM.70-72,University of Califomia,Berkley.Califor
[32]Enrique Miraambell,Antonlj Agudo:Temperature and stress Distributions in Concrete Box Girder Bridges,Journa of Strcture Engineering,Sep.1990
[33]吴文明.斜弯桥空间结构分析.硕士学位论文,2004年6月
[34]戴公连.桥梁复杂结构空间分析设计方法研究与应用.博士后学位论文,2001年5月
[35]俞先林.箱形梁桥空间应力分析的等参壳元法.硕士学位论文,2003年5月
[36]顾松年,尤文洁,诸德培.结构试验基础.国防工业出版社.1981年
[37]丁汉哲.试验技术.机械工业出版社,1982
[38]冯师颜.误差理论与试验数据处理.科学出版社,1964
[39]徐挺.相似理论与模型试验.中国农业机械出版社,1982年
[40]袁文忠.相似理论与静力学模型试验.西南交通大学出版社,1998年
[2]中华人民共和国交通部《公路桥涵施工技术规范》(JTJ041-2000)
[3]西安市大兴路立交工程D2联现浇梁设计施工图(2004.9)
[4]伍海山,李德建.并排大悬臂变截面箱梁支承桥面系的空间分析与试验研究.长沙铁道学院学报,2002年06期
[5]陈硕苇蒋志贤.大跨度悬挑结构的设计与试验.结构工程师,1999年02期
[6]林树,甘良绪,高作平.钢筋混凝土悬臂梁粘钢加固试验研究.武汉水利电力学院学报,1993年12期
[7]张士铎.悬臂行车道板计算理论综述.重庆交通学院学报,2001年2期
[8]叶爱君,袁万城,胡世德.预应力混凝土大悬臂延性性能试验研究.结构工程师,1996年1期
[9]伍海山,李德建.并排大悬臂变截面箱梁支承桥面系的空间分析与试验研究,2002年2期
[10]郑振,谷音.大悬臂变截面箱梁剪力滞效应分析.福州大学学报(自然科学版)2001年2期
[11]罗许国,李朝奎.大悬臂钢脊骨梁结构模型剪力滞效应探讨.湘潭师范学院学报,2004年1期
[12]T.I.Campel and L.Chitnuyanondh.Horizontally Curved continuous post-ten-sioned Concrete Beams.PCI journal,March-April 1975,(3):45-52
[13]T.L Compbel.Design Consideration in Horizontall-Curved prestressed Concrete Bridge Structures.International Conference on Short and Medium Span Bridges,Toronto,1982:135-143
[14]李新平.大悬臂薄壁钢挑梁的稳定计算.华南理工大学学报(自然科学版)2002年6期
[15]罗许国,戴公连.大悬臂桥面板钢脊骨梁结构模型剪力滞效应有限元分析.长沙铁道学院学报,2002年1期
[16]常传利,白海莹,王辉.三跨连续箱梁斜弯桥静力试验和分析.黑龙江交通科技,1999年02期
[17]孙全胜,王学松.连续箱梁斜弯桥有机玻璃模型静力试验和分析.东北公路,2002年04期
[18]贺栓海等.弯桥实用计算方法研究.长安大学研究报告,2001年
[19]孙广华.曲线梁桥计算.人民交通出版社.1995[20]
[20]高岛春生著.张德礼译.曲线梁桥.中国建筑工业出版社,1994年
[21]李惠生,张罗溪.曲线梁结构分析.中国铁道出版社,1992年
[22]邵容光等.混凝土弯梁桥.人民交通出版社,1994年
[23]Ont.Ministry Transportation and Communication.Ontario Highway Bridge Design Code,1983
[24]彭大文,颜海.曲线梁桥剪力滞系数实用计算法.福州大学学报(自然科学版),2001年12期
[25]杨允文,宋启根.曲线箱梁剪力滞效应及有效宽度的理论分析.东南大学学报,1994年05期
[26]宋一凡.公路桥梁荷载试验与结构评定.人民交通出版社,2002年
[27]张如一,陆跃桢.试验应力分析.机械工业出版社,1981
[28]徐日旭,王博仪,赵家奎.桥梁检验.人民交通出版社,1992年
[29]刘波.大曲率连续钢箱梁剪力滞效应试验研究.硕士学位论文,2004年6月
[30]吴宁.城市立交桥曲线异形箱梁的空间分析.硕士学位论文,2004年6月
[31]Meyer.C.Analysis and Design of Curved Box Girder Bridge Strucures and Material.Research Department of Civil Engineering,Division of Structural Engineering and Structural Mechanics,Report No.UC.SECM.70-72,University of Califomia,Berkley.Califor
[32]Enrique Miraambell,Antonlj Agudo:Temperature and stress Distributions in Concrete Box Girder Bridges,Journa of Strcture Engineering,Sep.1990
[33]吴文明.斜弯桥空间结构分析.硕士学位论文,2004年6月
[34]戴公连.桥梁复杂结构空间分析设计方法研究与应用.博士后学位论文,2001年5月
[35]俞先林.箱形梁桥空间应力分析的等参壳元法.硕士学位论文,2003年5月
[36]顾松年,尤文洁,诸德培.结构试验基础.国防工业出版社.1981年
[37]丁汉哲.试验技术.机械工业出版社,1982
[38]冯师颜.误差理论与试验数据处理.科学出版社,1964
[39]徐挺.相似理论与模型试验.中国农业机械出版社,1982年
[40]袁文忠.相似理论与静力学模型试验.西南交通大学出版社,1998年