斜高墩受力性能与主梁挠度的参数分析研究

发布时间：2018-05-29 23:05

本文选题：斜高墩 + 几何非线性　；参考：《长沙理工大学》2014年硕士论文

【摘要】：本文以张花高速酉水大桥为工程背景,对施工过程中斜高墩的受力以及斜高墩和箱梁相关参数对主梁挠度的影响进行了研究,具体的研究工作和成果如下：(1)分别建立酉水大桥主桥整体模型和右幅5#墩的三维实体模型,研究施工过程中斜高墩的受力；考虑几何非线性效应以及斜交角度变化对桥墩受力性能的影响。研究表明,斜交高墩墩身最大拉、压应力都发生在墩身两侧的角点处；斜交墩的内力与变形由于考虑了几何非线性效应都有不同程度的增加；在斜交角为50。时,桥墩的受力最不利。(2)以酉水大桥斜交高墩为例,建立右幅5#墩的实体模型；对斜交高墩做屈曲分析,对比分析桥墩在不考虑几何非线性效应与考虑几何非线性效应以及双重非线性效应这三种情况下,桥墩的临界荷载所发生的变化规律。研究表明,桥墩的一阶线性特征值是随斜交角度的增加而降低的；考虑几何非线性和双重非线性效应对桥墩的临界荷载值是降低的；随着斜交角度的增大,墩顶的临界荷载是先降后升的,最小的临界荷载表示桥墩的承载能力最差(发生在斜交角度为50。时),这与(1)中的结论吻合。(3)文章中介绍了桥梁结构主要设计参数的确定。以酉水大桥主桥为工程背景,运用MIDAS软件建立有限元分析整体模型；分析了箱梁相关参数对主梁挠度的影响程度,同时也分析了斜高墩相关参数对主梁挠度的影响程度。研究表明,随着斜交角的变化,两边跨的恒载挠度是随着斜交角度的增加而增加的,中跨的恒载挠度是随着斜交角度的增加而减少的。
[Abstract]:In this paper, the influence of the stress of the high piers and the related parameters of the high piers and box beams on the deflection of the main beam in the construction process is studied. The specific research work and results are as follows: (1) the three-dimensional solid model of the main bridge of the main bridge and the right amplitude 5# pier are established respectively, and the construction process is studied. The effect of geometric nonlinear effect and skew angle change on the force performance of piers is considered. The study shows that the maximum pull of the piers and the pressure stress occur at the corner points on both sides of the pier, and the internal force and deformation of the inclined piers increase in varying degrees because of the geometric non linear effect. When the angle is 50., the force of the pier is the most unfavorable. (2) taking the high pier of the uni water bridge as an example, the solid model of the right amplitude 5# pier is set up. The buckling analysis of the skew high pier is made, and the critical loads of the pier are compared and analyzed in three cases where the pier does not consider the geometric nonlinear effect and the geometric nonlinear effect and the double nonlinear effect. The study shows that the first linear eigenvalue of the pier decreases with the increase of the oblique angle, and the critical load value of the pier is reduced by considering the geometric nonlinearity and the double nonlinear effect. With the increase of the oblique angle, the critical load of the pier top is first descended and then rising, and the minimum critical load is the bearing capacity of the pier. The worst is (50. when the angle of oblique intersection is 50.), which coincides with the conclusion in (1). (3) the main design parameters of the bridge structure are introduced in the article. Taking the main bridge of the bridge as the engineering background, the whole model of the finite element analysis is established by using the MIDAS software, and the influence degree of the related parameters of the box girder on the deflection of the main beam is analyzed, and the analysis is also analyzed. The influence of the relative parameters of the high piers on the deflection of the main beam has been studied. The study shows that with the change of the oblique angle, the constant load deflection of the two sides increases with the increase of the oblique angle, and the constant load deflection of the middle span decreases with the increase of the oblique angle.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.41

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