设计参数对空腹式连续刚构桥关键截面内力的影响
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摘要
为掌握空腹式连续刚构桥在自重、汽车荷载作用下桥梁关键截面内力分布特征与腹板挖空率和弦梁刚度比的关系,以有限元法为基础,借助结构分析软件建立了空腹式连续刚构桥的数值模型,计算了自重、汽车荷载作用下跨中弯矩、上下弦梁接合处弯矩、弦梁墩顶截面弯矩以及下弦梁弯矩。论文还研究了这些截面弯矩比随着挖空率、弦梁刚度比的变化规律。研究表明腹板挖空率的增加,会缩小空腹段的负弯矩与实腹段的负弯矩的差距,但会放大实腹段內正负弯矩的差距。上下弦梁刚度比变化不影响实腹段弯矩分配,但上下弦梁负弯矩大小按它们刚度比进行分配,刚度比为0.25时,上下弦梁最大负弯矩相近。
In order to investigate the internal force distribution in key section,and the relation between web hollow rate and the chord beam stiffness ratio of open-web continuous rigid frame bridge under the action of deadweight and vehicle load,a numerical model of the bridge is built with structure analysis software based on FEM. The bending moments in the mid-span section,in the section of upper and lower chord connection,in the section of upper chord pier top and in the section of lower chord under the action of deadweight and vehicle load are calculated. The rules of these bending moment ratios varying with the hollow rate and the chord beam stiffness ratio are researched. The research shows that( 1) the increase of web hollow rate reduces the difference of negative bending moments between open and solid sections,magnifies the difference of negative and positive bending moments in the solid section;( 2) the change of the stiffness ratio between upper and lower chords has no influence on the bending moment distribution in solid section,but the negative bending moments in upper and lower chord beams are distributed according to the stiffness ratio;( 3) the maximum negative bending moments of upper and lower chord beams become similar when the stiffness ratio between upper and lower chords is 0. 25.
In order to investigate the internal force distribution in key section,and the relation between web hollow rate and the chord beam stiffness ratio of open-web continuous rigid frame bridge under the action of deadweight and vehicle load,a numerical model of the bridge is built with structure analysis software based on FEM. The bending moments in the mid-span section,in the section of upper and lower chord connection,in the section of upper chord pier top and in the section of lower chord under the action of deadweight and vehicle load are calculated. The rules of these bending moment ratios varying with the hollow rate and the chord beam stiffness ratio are researched. The research shows that( 1) the increase of web hollow rate reduces the difference of negative bending moments between open and solid sections,magnifies the difference of negative and positive bending moments in the solid section;( 2) the change of the stiffness ratio between upper and lower chords has no influence on the bending moment distribution in solid section,but the negative bending moments in upper and lower chord beams are distributed according to the stiffness ratio;( 3) the maximum negative bending moments of upper and lower chord beams become similar when the stiffness ratio between upper and lower chords is 0. 25.
引文
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[10]文武松.大跨度PC连续刚构桥挠曲开裂因素研究[D].成都:西南交通大学,2009.WEN Wu-song.Study on Reason and Regularity of Cracking and Increasing of Deflection for Long Span Pc Continuous Rigid Frame Bridge[D].Chengdu:Southwest Jiaotong University,2009.
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[2]周军生,楼庄鸿.大跨径预应力混凝土连续刚构桥的现状和发展趋势[J].中国公路学报,2000,13(1):31-37.ZHOU Jun-sheng,LOU Zhuang-hong.The Status Quo and Developing Trends of large-span Prestressed Concrete Bridges with Continuous Rigid Frame Structure[J].China Journal of Highway and Transport,2000,13(1):31-37.
[3]周勇军.高墩大跨曲线连续刚构桥梁地震响应的设计参数研究[D].西安:长安大学,2006.ZHOU Yong-jun.Study on Design Parameters Affecting Seismic Response of Curved Continuous Rigid Frame Bridges with Long-span and High Pier[D].Xi'an:Chang'an University,2006.
[4]张楠.预防大跨PC梁桥开裂和下挠的措施研究[D].长沙:湖南大学,2011.ZHANG Nan.Research of Measure to Prevent Long-span PC Girder Bridge from Crack and Deflection[D].Changsha:Hunan University,2011.
[5]徐君兰,顾安邦.连续刚构桥主墩刚度合理性的探讨[J].公路交通科技,2005,22(2):59-62.XU Jun-lan,GU An-bang.Discussion of Rationality of Rigidity of Continuous Rigid Frame Bridge[J].Journal of Highway and Transportation Research and Development,2005,22(2):59-62.
[6]文曙东,卫星,李俊,等.重庆石板坡长江大桥钢一混凝土结合段疲劳试验荷载研究[J].世界桥梁,2007(2):51-54.WEN Shu-dong,WEI Xing,LI Jun,et al.Study of Fatigue Test Load for Steel and Concrete Joint Part of Shibanpo Changjiang River Bridge in Chongqing[J].World Bridges,2007(2):51-54.
[7]丁少凌,陈宏卓,南军强.伦洲大桥主桥结构设计[J].桥梁建设,2012,42(2):73-78.DING Shao-ling,CHEN Hong-zhuo,NAN Jun-qiang.Structural Design of Main Bridge of Lunzhou Bridge[J].Bridge Construction,2012,42(2):73-78.
[8]黄坤全,彭旭民.空腹式连续刚构桥施工过程受力特性分析[J].桥梁建设,2011(3):40-43.HUANG Kun-quan,PENG Xu-min.Analysis of Mechanical Behavior of a Presressed Concrete Open-web Continuous Rigid-frame Bridge in Construction Process[J].Bridge Construction,2011(2):40-43.
[9]房慧明,龙晓鸿,樊剑,等.空腹式连续刚构桥抗震性能评价[J].武汉理工大学学报,2013,35(7):89-93.FANG Hui-ming,LONG Xiao-hong,FAN Jian,et al.Seismic Performance Evaluation of Open-web Continuous Rigid Frame Bridge[J].Journal of Wuhan University of Technology,2013,35(7):89-93.
[10]文武松.大跨度PC连续刚构桥挠曲开裂因素研究[D].成都:西南交通大学,2009.WEN Wu-song.Study on Reason and Regularity of Cracking and Increasing of Deflection for Long Span Pc Continuous Rigid Frame Bridge[D].Chengdu:Southwest Jiaotong University,2009.
[11]卫星,李小珍,李俊,等.钢一混凝土混合结构在大跨度连续刚构桥中的应用[J].中国铁道科学,2007,28(5):43-46.WEI Xin,LI Xiao-zhen,LI Jun,et al.Using Steel Concrete Hybrid Structure in Long Span Continuous Rigid Frame Bridge[J].China Railway Science,2007,28(5):43-46.
[12]罗松涛,黄才良,荆友璋.不对称连续刚构的不对称系数[J].公路交通科技,2012,29(4):62-66.LUO Songtao,HUANG Cailiang,JING Youzhang.Asymmetric Coefficient of Asymmetric Continuous Rigid Frame Structure[J].Journal of Highway and Transportation Research and Development,2012,29(4):62-66.
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