施工阶段自锚式悬索桥超宽混凝土箱梁纵向应力分析
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摘要
为了分析自锚式悬索桥超宽混凝土箱梁在施工过程中的受力状态,通过实桥应力测试和Midas/FEA有限元分析,研究了超宽加劲梁的纵向应力水平及其分布规律。研究结果表明:在体系转换过程中,主缆轴力逐渐增大,且主梁顶板纵向压应力整体逐渐增大,梁底板纵向应力的变化与主梁的挠度变形密切相关。在施工过程中,各测点纵向应力实测结果与计算结果吻合良好,超宽加劲梁受力空间效应明显,主梁各截面纵向应力沿横截面的分布具有明显的不均匀性。主梁中跨跨中与边跨跨中截面剪力滞效应均表现为由正剪力滞向负剪力滞转换,且主梁中跨跨中截面纵向应力变化及剪力滞效应较边跨跨中明显。
To investigate the mechanic properties of the super wide concrete girder of self-anchored suspension bridge during construction process,the longitudinal stress levels and transverse distribution of the super wide girder were analyzed by the field measurement and Midas/FEA finite element analysis.Results showed that the longitudinal stress of top plates of the girder gradually increased with the increase of cable force and the longitudinal stress of the bottom plates of the girder was strongly related to the deflection of the girder during system transformation process. During construction process,the calculated results of longitudinal stress were consistent with the measured data. The spatial effect of the super wide girder was obvious and the longitudinal stresses of the top and bottom plates of girder distributed unevenly along the transverse direction of girder. The shear lag effects of all spans showed the transformation effectfrom the positive shear lag to negative one. The variation of longitudinal stress and shear lag effect of midspan were more significant compared with side span.
To investigate the mechanic properties of the super wide concrete girder of self-anchored suspension bridge during construction process,the longitudinal stress levels and transverse distribution of the super wide girder were analyzed by the field measurement and Midas/FEA finite element analysis.Results showed that the longitudinal stress of top plates of the girder gradually increased with the increase of cable force and the longitudinal stress of the bottom plates of the girder was strongly related to the deflection of the girder during system transformation process. During construction process,the calculated results of longitudinal stress were consistent with the measured data. The spatial effect of the super wide girder was obvious and the longitudinal stresses of the top and bottom plates of girder distributed unevenly along the transverse direction of girder. The shear lag effects of all spans showed the transformation effectfrom the positive shear lag to negative one. The variation of longitudinal stress and shear lag effect of midspan were more significant compared with side span.
引文
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[2] KIM H K,LEE M J,CHANG S P. Determination of hanger installation procedure for a self-anchored suspension bridge[J].Engineering Structures,2006,28(7):959.
[3]青雄,杨小平,李建慧.南京小龙湾大桥结构设计与成桥状态研究[J].南京工程学院学报(自然科学版),2012,10(3):23.
[4]张海.混凝土自锚式悬索桥加劲梁抗裂性能研究[D].成都:西南交通大学,2008.
[5]李爱群,王浩.子模型法在超大跨悬索桥钢箱梁应力分析中的应用[J].工程力学,2007,24(2):80.
[6]周广盼,李爱群,李建慧,等.车载作用下超宽混凝土箱梁自锚式悬索桥静力特性[J].东南大学学报(自然科学版),2016,46(3):578.
[7]李志强.大跨径宽箱桥梁空间效应分析[D].哈尔滨:哈尔滨工业大学,2007.
[8]张杨永.连续刚构箱梁桥剪力滞效应的参数分析[J].公路工程,2008,33(4):58.
[9]张磊,郑宝成,成丕富.双反弯曲线钢箱连续梁桥剪力滞效应研究[J].公路工程,2013,38(4):124.
[10]陶海,肖汝诚.混凝土斜拉桥主梁剪力滞研究[J].结构工程师,2008,24(5):50.
[11]余泽.超宽分离式混凝土边箱梁正截面受力性能研究[D].长沙:湖南大学,2011.
[12]端茂军,李建慧,索小灿等.混凝土自锚式悬索桥鞍座的精细化模拟方法[J].南京工业大学学报(自然科学版),2016,38(6):112.
[13]代百华.边主梁截面自锚式悬索桥主梁剪力滞效应分析[D].成都:西南交通大学,2007.