槽型截面连续刚构桥受力特性分析
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摘要
通过数值计算研究了槽型梁在竖向及横向力作用下的受力特点。研究表明,在竖向左右对称荷载作用下,主梁产生竖向和横向位移,弯扭耦合效应明显。槽型梁截面下部面积大,中性轴靠下,主梁下缘应力通常比主梁上缘小,道床板宽度大时横向拉应力有时可能大于纵向拉应力。增加主梁肋板数量能提高主梁侧向抗弯刚度,增加肋板数量对主梁整体抗扭刚度的提升效果有限。
In this paper,the numerical simulation is used to study the behavior of channel beam bridge under vertical and lateral loads.It shows that the vertical and horizontal displacement of main girder under left-right symmetrical vertical loads is obvious,and the bending and torsion coupling effect is obvious.The lower area of channel section is larger than the upper area,the neutral axis is on the lower position,so the longitudinal stress at the upper edge is usually greater than the stress at bottom area,and the slab transverse tensile stress may be greater than the longitudinal stress if the bridge is wide enough.Increasing the number of ribs can improve lateral bending stiffness of the main girder,but would barely improve the overall torsional stiffness of the main girder.
In this paper,the numerical simulation is used to study the behavior of channel beam bridge under vertical and lateral loads.It shows that the vertical and horizontal displacement of main girder under left-right symmetrical vertical loads is obvious,and the bending and torsion coupling effect is obvious.The lower area of channel section is larger than the upper area,the neutral axis is on the lower position,so the longitudinal stress at the upper edge is usually greater than the stress at bottom area,and the slab transverse tensile stress may be greater than the longitudinal stress if the bridge is wide enough.Increasing the number of ribs can improve lateral bending stiffness of the main girder,but would barely improve the overall torsional stiffness of the main girder.
引文
[1]胡俊.闽江桥道碴桥面槽型梁结构受力分析[D].长沙:中南大学,2007.
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[3]王传素.槽型桥-拱组合桥主要结构设计特点及静力分析[J].桥梁建设,2010(3):40-42.
[4]唐小兵,贾志伟,黄爱,等.连续刚构桥施工过程中腹板斜裂缝成因分析及试验研究[J].武汉理工大学学报(交通科学与工程版),2017,41(2):195-198.
[5]王东军,刘刚.桩基平台的力学模型及其在ANSYS中的实现[J].中国海洋平台,2005(2):34-38.
[2]林文泉.槽型桥梁在城市轨道交通中的应用探讨[D].北京:北京交通大学,2005.
[3]王传素.槽型桥-拱组合桥主要结构设计特点及静力分析[J].桥梁建设,2010(3):40-42.
[4]唐小兵,贾志伟,黄爱,等.连续刚构桥施工过程中腹板斜裂缝成因分析及试验研究[J].武汉理工大学学报(交通科学与工程版),2017,41(2):195-198.
[5]王东军,刘刚.桩基平台的力学模型及其在ANSYS中的实现[J].中国海洋平台,2005(2):34-38.