单箱多室波形钢腹板部分斜拉桥剪力传递分析

发布时间：2018-06-04 00:34

本文选题：单箱多室波形钢腹板部分斜拉桥 + 剪力分布　；参考：《郑州大学》2015年硕士论文

【摘要】：单箱多室波形钢腹板组合箱梁作为一种新型的组合桥梁结构,国内外对其研究较少,有些问题还需要深入研究。例如:波形钢腹板是否承担了组合箱梁的全部剪力,混凝土顶、底板只参与抗弯作用;单箱多室组合箱梁中每片钢腹板分担的剪力是否相同;横隔板对组合箱梁有何抗扭作用;本文以朝阳沟大桥——单箱多室波形钢腹板部分斜拉桥为工程实例,对上述问题进行研究,主要研究内容及完成的工作如下:1.建立朝阳沟大桥有限元精细计算模型,通过仿真分析,论证单箱多室波形钢腹板组合箱梁“拟平面假定”的适用性。2.进行朝阳沟大桥在自重、预应力、斜拉索拉力、满布活载、偏载作用下的结构分析,定量分析每种工况下各片波形钢腹板所分担的剪力比及波形钢腹板承担的截面剪力的承剪比。得出:波形钢腹板承担了组合箱梁中的大部分剪力,对称荷载工况下每片腹板各自承担的剪力比例大致相等。其中,自重作用下波形钢腹板承担的剪力最大;由于体内、体外预应力筋的作用,使得朝阳沟大桥在预应力作用下的波形钢腹板承担剪力的比例要低于自重作用;由于斜拉索拉力的作用,使得该情况下波形钢腹板承担的剪力比例相对最小;在预应力筋、斜拉索拉力以及满布活载作用下波形钢腹板承担了85.11%的剪力;在偏载作用下,各片腹板承担剪力不再均等,靠近偏载作用位置的腹板承担剪力比例较高,远离偏载作用位置的钢腹板承担剪力比例相对较低。3.研究混凝土横隔板对单箱多室波形钢腹板组合箱梁扭转的影响,通过分别改变混凝土横隔板的厚度以及横隔板的数量,定量探讨混凝土横隔板对组合箱梁扭转影响的程度,得出:随着混凝土横隔板厚度的增加,箱梁截面扭转角逐渐变小,但箱梁扭转角变化和横隔板厚度变化不呈线性关系;随着混凝土横隔板数量的增加,箱梁截面的扭转角逐渐变小,但变化不明显;当混凝土横隔板数量增加到一定数量后,箱梁截面扭转角虽有所降低,但变化幅度越来越小。
[Abstract]:As a new type of composite bridge structure, there are few researches on it at home and abroad, and some problems still need to be studied deeply. For example, whether the corrugated steel web bear all the shear force of the composite box girder, the concrete top and bottom only participate in the bending action, whether the shear force shared by each piece of steel web in the single box and multi-chamber composite box girder is the same, what kind of torsional action does the transverse diaphragm have to the composite box girder; Taking Chaoyang ditch Bridge, a cable-stayed bridge with single box and multi-chamber corrugated steel webs, as an engineering example, the above problems are studied in this paper. The main contents of the study and the work accomplished are as follows: 1. The finite element fine calculation model of Chaoyang ditch Bridge is established. Through simulation and analysis, the applicability of "pseudo-plane assumption" of single box and multi-chamber corrugated steel web composite box girder is demonstrated. The structure analysis of Chaoyang Gouge Bridge under the action of deadweight, prestress, cable-stayed cable tension, full live load and partial load is carried out. The shear ratio of each wavy steel web plate and the shear bearing ratio of the section shear force borne by the corrugated steel web plate are quantitatively analyzed. It is concluded that the corrugated steel web bears most of the shear forces in the composite box girder, and the shear ratio of each web under symmetrical load is approximately equal. Among them, the shear force of corrugated steel web is the largest under the action of self-weight, because of the effect of internal and external prestressing tendons, the proportion of shear of corrugated steel web of Chaoyang Bridge under prestress is lower than that of deadweight. Due to the effect of cable-stayed cable tension, the shear ratio of corrugated steel webs is relatively minimum in this case; under prestressed tendons, cable-stayed cable tension and full live load, the shear force of corrugated steel web is 85.11%; under the action of partial load, the shear force is 85.11%. The shear ratio of web plate near the position of biasing load is higher than that of steel web plate which is far away from the position of eccentric load, and the shear ratio of steel web plate which is far away from the position of eccentric load is lower than that of steel web plate which is far away from the position of eccentric load. The effect of concrete transverse diaphragm on the torsion of single box multi-chamber corrugated steel web composite box girder is studied. By changing the thickness of concrete transverse diaphragm and the quantity of transverse diaphragm, the influence of concrete transverse partition on the torsion of composite box girder is quantitatively discussed. It is concluded that the torsional angle of box girder becomes smaller with the increase of concrete transverse diaphragm thickness, but the change of box girder torsion angle is not linear with the change of transverse diaphragm thickness, and with the increase of the number of concrete transverse diaphragm, The torsional angle of box girder section becomes smaller, but the change is not obvious. When the number of concrete diaphragm increases to a certain number, the torsional angle of box girder section decreases, but the range of change becomes smaller and smaller.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.27

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