小半径曲线刚构-连续梁桥单箱双室主梁合理构造设计研究
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摘要
为了解小半径曲线刚构-连续单箱双室箱梁桥弯扭耦合作用效应,指导主梁合理构造设计,以莫桑比克某跨海大桥北引桥(小半径多跨曲线刚构-连续单箱双室箱梁桥)为研究对象,采用MIDAS Civil软件建立该桥整体模型,采用ANSYS软件建立局部实体模型,计算不同顶板厚度箱梁的扭转受力性能,分析弯扭作用下箱梁断面各部位剪力分布规律。结果表明:箱梁约束扭转产生的翘曲正应力相对弯曲正应力较小,设计时可忽略不计;顶板整体加厚可降低顶板扭转剪应力和翘曲正应力,可分别降低24%、33%;扭矩对两侧边腹板剪力存在差异影响,对内侧边腹板影响较大,不利影响达40%,弯桥设计时腹板厚度应按受力最不利的内侧腹板控制。
To examine the bending-torsion coupling effect of the curved rigid frame-continuous girder bridge that has sharp radius and has the main girder formed of the double-cell single box beams and guide the rational structural design of the main girder,the north approach of a seacrossing bridge in Mozambique was cited as an example.The bridge is a curved multi-span rigid frame-continuous girder bridge with sharp radius and with double-cell single box beams.The MIDAS Civil software was used to establish the overall model of the bridge and the ANSYS software was used to establish the local solid model of the bridge,to calculate the torsion resistant ability of the box beams with top plate of various thickness and analyze the shear force distribution law in different parts of the box beam section under the action of bending and torsion.The results show that the warping normal stress induced by the torsion resistant force of the box girder is relatively smaller than the bending normal stress,which can be omitted in the design.Increasing the thickness of the overall top plate can reduce the torsional shear stress and the warping normal stress by24% and 33%,respectively.The torsional moment has differential influences on the shear forces in the edge webs on the two sides,and has big influence on the inner edge webs,with an adverse impact reaching up to 40%.Hence,the inner webs with the most unfavorable load bearing condition should be the governing factor in the design of the thickness of the webs of the curved bridge.
To examine the bending-torsion coupling effect of the curved rigid frame-continuous girder bridge that has sharp radius and has the main girder formed of the double-cell single box beams and guide the rational structural design of the main girder,the north approach of a seacrossing bridge in Mozambique was cited as an example.The bridge is a curved multi-span rigid frame-continuous girder bridge with sharp radius and with double-cell single box beams.The MIDAS Civil software was used to establish the overall model of the bridge and the ANSYS software was used to establish the local solid model of the bridge,to calculate the torsion resistant ability of the box beams with top plate of various thickness and analyze the shear force distribution law in different parts of the box beam section under the action of bending and torsion.The results show that the warping normal stress induced by the torsion resistant force of the box girder is relatively smaller than the bending normal stress,which can be omitted in the design.Increasing the thickness of the overall top plate can reduce the torsional shear stress and the warping normal stress by24% and 33%,respectively.The torsional moment has differential influences on the shear forces in the edge webs on the two sides,and has big influence on the inner edge webs,with an adverse impact reaching up to 40%.Hence,the inner webs with the most unfavorable load bearing condition should be the governing factor in the design of the thickness of the webs of the curved bridge.
引文
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[11]卢海林,蔡恒,汤正.移动荷载作用下薄壁曲线箱梁剪力滞效应分析[J].铁道建筑,2016(9):14-18.
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[13]李茂奇.支承方式对小半径连续曲线箱形梁桥受力性能的影响研究[J].公路,2011(7):136-139.
[14]李翊策,鞠三,徐秀丽,等.曲线梁桥不同约束形式下的受力性能及其适用性分析[J].世界桥梁,2012,40(6):43-46,72.
[15]刘保纲,郭咏辉.曲线箱梁桥的地震反应分析[J].土木工程学报,2003,36(10):56-59.
[16]宋国华,王东炜,刘小芳.圆心角对曲线箱梁桥模态及振型方向因子的影响[J].公路,2014,59(12):86-90.
[2]吴运宏,文熠.小半径平曲线桥同步旋转顶升位移原理与施工技术[J].桥梁建设,2016,46(4):109-113.
[3]谢旭,黄剑源.曲线箱梁桥结构分析的一种有限元计算方法[J].土木工程学报,2005(2):75-80.
[4]曹景,刘志才,冯希训.箱形截面直线桥及曲线桥抗倾覆稳定性分析[J].桥梁建设,2014,44(3):69-74.
[5]王存国,彭华春,段竑.铁路小半径曲线刚构-连续梁桥设计研究[J].铁道标准设计,2017,61(8):55-59.
[6]杨孟刚,陈庚.大跨度曲线刚构桥预应力设置对扭矩的影响[J].桥梁建设,2010(3):15-18.
[7]甘亚南,周广春.曲线矩形箱梁静力分析的双翘曲位移函数法[J].土木工程学报,2010,43(4):63-69.
[8]孙全胜,李茂奇.G-M法在小半径曲线箱形梁桥应力分析中的应用研究[J].世界桥梁,2011(3):45-48,68.
[9]张元海,李乔.曲线箱梁考虑剪滞效应时的弯扭分析[J].工程力学,2009,26(10):123-129.
[10]张元海,李乔.考虑剪滞变形及约束扭转二次剪切变形影响时薄壁曲线箱梁的挠曲扭转分析[J].土木工程学报,2009,42(3):93-98.
[11]卢海林,蔡恒,汤正.移动荷载作用下薄壁曲线箱梁剪力滞效应分析[J].铁道建筑,2016(9):14-18.
[12]何云勇.一种分析曲线箱梁剪力滞效应的传递矩阵法[J].重庆交通大学学报(自然科学版),2010,29(5):670-673.
[13]李茂奇.支承方式对小半径连续曲线箱形梁桥受力性能的影响研究[J].公路,2011(7):136-139.
[14]李翊策,鞠三,徐秀丽,等.曲线梁桥不同约束形式下的受力性能及其适用性分析[J].世界桥梁,2012,40(6):43-46,72.
[15]刘保纲,郭咏辉.曲线箱梁桥的地震反应分析[J].土木工程学报,2003,36(10):56-59.
[16]宋国华,王东炜,刘小芳.圆心角对曲线箱梁桥模态及振型方向因子的影响[J].公路,2014,59(12):86-90.
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