波形钢腹板—钢管混凝土组合结构箱梁桥的扭转和畸变研究

发布时间：2018-07-26 11:04

【摘要】：波形钢腹板-钢管混凝土组合箱梁作为一种新型的组合箱梁桥结构,主要由混凝土顶板、波形钢腹板和哑铃型钢管混凝土三部分组合而成。该种新型结构箱梁桥与普通波形钢腹板组合箱梁桥结构上的最大不同在于其下底板的混凝土板被哑铃型钢管混凝土弦杆所代替。这种构造很好地利用了钢管混凝土在抗拉、抗压上的力学优点;同时提高了结构的整体性以及抗裂性能,在一定程度上减小了结构梁体的自重,为大跨度桥梁的设计施工提供了另一种新的可能;另外就钢管混凝土而言,其抗扭性能也明显好于普通的钢筋混凝土板,在抵抗汽车活荷载所造成的扭转变形时可以充分发挥出其结构特性。对于这种新型结构的应用,需要对其结构相关的力学性能进行系统的研究,但由于篇幅所限,本文只是重点进行了波形钢腹板-钢管混凝土组合结构箱梁桥在受到偏心荷载时的扭转和畸变性能的研究,主要的工作和论证列举如下:(1)首先对于相关的波形钢腹板组合箱梁桥的国内外研究现状,以及其结构特点进行总结,从而为波形钢腹板-钢管混凝土组合箱梁的扭转分析提供重要的参考和依据。(2)根据已有的传统波形钢腹板的抗扭分析理论计算公式类比出该种新型结构箱梁的扭转畸变分析计算公式,通过对相关算例的理论计算结果与有限元模型计算值的对比,确定作者的建模分析思路的正确性。(3)选用有限元分析软件MIDAS/FEA建立实体有限元模型并分别施加对称荷载工况和偏心荷载工况进行扭转和畸变效应分析。通过计算得到波形钢腹板-钢管混凝土组合箱梁桥在不同工况下的扭转和畸变的正应力,剪应力以及挠度的放大系数值。对这些数据进行相应的总结分析,得出该种新型结构箱梁的扭转和畸变效应的规律。与此同时将该种新型结构箱梁桥的分析结果与同跨度,同梁高的相似传统波形钢腹板组合箱梁桥进行比较分析得出该种新型组合结构箱梁桥在抗扭承载力上较普通波形钢腹板结构箱梁有所提高。(4)通过分别改变腹板的倾角θ、波形钢腹板的板厚、波形钢腹板横板段宽度、波形钢腹板的弯折角度以及梁体结构的高跨比这五种不同的结构参数来分析每一种单一结构参数的变化对新型结构箱梁扭转和畸变效应的影响,得出其变化的一般规律,确定该种新型结构箱梁桥的最佳尺寸范围。
[Abstract]:As a new type of composite box girder bridge, the composite box girder with corrugated steel web and concrete filled steel tube is composed of concrete roof, corrugated steel web and dumbbell-shaped concrete filled steel tube. The biggest difference between the new type of box girder bridge and the ordinary corrugated steel web composite box girder bridge is that the concrete slab of the lower floor is replaced by the dumbbell-shaped concrete filled steel tube chord. This structure makes good use of the mechanical advantages of concrete-filled steel tube in tensile and compressive resistance, improves the integrity and crack resistance of the structure, and reduces the weight of the structure beam to a certain extent. It also provides a new possibility for the design and construction of long-span bridges. In addition, the torsional resistance of concrete-filled steel tube is obviously better than that of ordinary reinforced concrete slabs. When resisting the torsional deformation caused by the living load of the automobile, it can give full play to its structural characteristics. For the application of this new type of structure, it is necessary to make a systematic study on the mechanical properties related to its structure, but due to space constraints, In this paper, the torsion and distortion behavior of corrugated steel-web concrete-filled steel tube composite structure box girder bridge under eccentric load is studied. The main work and argumentation are listed as follows: (1) the domestic and foreign research status of the corrugated steel web composite box girder bridge and its structural characteristics are summarized. This provides an important reference and basis for torsional analysis of corrugated steel web and concrete filled steel tubular composite box girder. (2) the torsion of the new type of box girder is compared according to the traditional theoretical formula of torsional analysis of corrugated steel webs. Formula for calculation of rotational distortion analysis, By comparing the theoretical results of relevant examples with the calculated values of the finite element model, (3) the finite element analysis software MIDAS/FEA is used to establish the solid finite element model and apply symmetrical load and eccentric load to analyze the torsion and distortion effects respectively. The torsion and distortion normal stress, shear stress and magnification factor of deflection of corrugated steel-web concrete filled steel tube composite box girder bridge under different working conditions were calculated. The torsion and distortion effects of the new structure box girder are obtained by summarizing and analyzing these data. At the same time, the analytical results of this new type of box girder bridge are compared with the same span. By comparing and analyzing the similar traditional corrugated steel web box girder bridge with the same beam height, it is concluded that the torsional bearing capacity of this new type of composite structure box girder bridge is higher than that of the ordinary corrugated steel web structure box girder bridge. (4) by changing the web plate respectively. The inclination 胃, the thickness of the corrugated steel web, Five different structural parameters, such as the width of the transverse section of the corrugated steel web, the bending angle of the corrugated steel web and the ratio of height to span of the beam structure, are used to analyze the effects of each single structural parameter on the torsion and distortion of the new type of box girder. The general law of its variation is obtained and the optimum size range of the new type of box girder bridge is determined.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441

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