波形钢腹板组合箱梁横向分布系数的计算方法研究

发布时间：2018-07-17 22:18

【摘要】：波形钢腹板组合箱梁是一种新型的钢—混凝土组合结构,由混凝土顶底板、波形钢腹板三部分组成,在日本和欧洲等国已得到较为广泛的应用。波形钢腹板组合箱梁与传统的混凝土腹板箱梁相比,因其优良的结构特性,具有十分广阔的应用前景。但与传统箱梁结构相比,目前尚缺乏相应的设计条例和规范,处于起步阶段。本文在已有研究的基础上,基于刚接梁法,针对波形钢腹板组合箱梁桥荷载横向分布系数的“传统刚接梁”算法进行了修正,并建立修正刚接梁法的力学计算模型,通过与模型实验、有限元结果以及传统刚接梁计算结果对比,验证了其合理性和精度。具体研究内容和结论如下:(1)基于有限元软件Midas Fea建立的单箱三室波形钢腹板箱梁空间有限元模型,分析了偏心荷载和扭转荷载作用下波形钢腹板组合箱梁跨中截面顶底板、腹板的应力特点和竖向挠度的变化规律。分析结果表明:在扭转荷载作用下,波形钢腹板组合箱梁顶底板跨中截面沿横向的竖向位移均呈直线变化,偏心荷载作用下箱梁的顶底板跨中截面横向挠度与相应纯扭状态的横向挠度差值呈水平直线变化,说明波形钢腹板组合箱梁表现出整体抗弯和整体抗扭的特点,与传统箱梁的抗弯抗扭特点一致,经典箱梁理论可适用于波形钢腹板组合箱梁桥。(2)基于刚接梁法原理,引入“拆分”思想,提出了适用于波形钢腹板组合箱梁计算的“修正刚接梁法”并建立了相应的力学计算模型,研究表明:建立修正刚接梁法的力学计算模型的关键是补全波形钢腹板组合箱梁切口处的顶底板赘余力;波形钢腹板箱梁的箱室每增加一个,力学模型的参量增加五个,为提高效率,提出了计算机的编程流程。(3)基于“传统刚接梁法”和相关文献的研究成果,推导了“修正刚接梁法”的计算公式,并给出“修正刚接梁法”计算波形钢腹板组合箱梁横向分布系数的计算流程。(4)基于某模型实验结果,运用“修正刚接梁法”计算该模型实验桥在不同工况作用下的横向分布系数,并以截面应力、支座反力、挠度为指标,与传统刚接梁法计算结果、有限元结果、模型实验结果进行对比,结果表明:修正刚接梁法能够较好的适用于波形钢腹板组合箱梁桥的横向分布系数计算,且相对于“传统刚接梁法”有更高计算精度。(5)通过设置不同工况改变荷载作用位置,分析了荷载作用位置对波形钢腹板组合箱梁的弯矩横向分配的影响,结果表明:荷载作用的纵向位置对弯矩的横向分布影响较小,实际工程中弯矩横向分布系数沿桥跨可统一采用由“修正刚接梁法”计算的跨中截面的横向分布系数。
[Abstract]:The corrugated steel web composite box girder is a new type of steel-concrete composite structure, which consists of concrete top and bottom slab and corrugated steel web. It has been widely used in Japan and Europe. Compared with the traditional concrete web box girder, the corrugated steel web composite box girder has a very broad application prospect because of its excellent structural characteristics. However, compared with the traditional box girder structure, there is still a lack of corresponding design regulations and specifications, so it is still in its infancy. Based on the previous research and the rigid-connected beam method, the "traditional rigid-connected beam" algorithm of load transverse distribution coefficient of composite box girder bridge with corrugated steel webs is modified, and the mechanical calculation model of modified rigid-jointed beam method is established. Compared with model experiment, finite element method and traditional rigid beam calculation, the rationality and accuracy of the method are verified. The specific research contents and conclusions are as follows: (1) based on the finite element software Midas Fea, the spatial finite element model of single-box three-compartment corrugated steel web box girder is established, and the top-bottom plate of the mid-section of the composite box girder with corrugated steel web under eccentric load and torsional load is analyzed. The stress characteristics of web and the variation of vertical deflection. The results show that the vertical displacement of the top and bottom span of the composite box girder with corrugated steel webs varies in a straight line under torsional load. Under eccentric load, the transverse deflection of the middle section of the top and bottom slab of the box girder varies in a horizontal straight line with the transverse deflection of the corresponding pure torsion, which shows that the composite box girder with corrugated steel webs shows the characteristics of overall bending resistance and overall torsion resistance. The classical box girder theory can be applied to the composite box girder bridge with corrugated steel webs. (2) based on the principle of rigid-connected beam method, the idea of "split" is introduced. A modified rigid-jointed beam method for the calculation of composite box girders with corrugated steel webs is proposed and the corresponding mechanical calculation model is established. The results show that the key to establish the model of modified rigid-jointed beam method is to supplement the top and bottom plate Yu Li at the notch of the composite box girder with corrugated steel webs, and the parameters of the mechanical model are increased by five for each additional box chamber of the corrugated steel web box girder. In order to improve the efficiency, the programming flow of the computer is put forward. (3) based on the research results of the traditional rigid-connected beam method and related literature, the calculation formula of "modified rigid-bonded beam method" is derived. The calculation flow of transverse distribution coefficient of composite box girder with corrugated steel webs is given. (4) based on the experimental results of a certain model, the flow chart of calculating the transverse distribution coefficient of composite box girder with corrugated steel webs is given. The transverse distribution coefficient of the model experimental bridge under different working conditions is calculated by "modified rigid-bonded beam method". The cross section stress, bearing reaction force and deflection are taken as indexes, which are compared with the traditional rigid-bonded beam method and the finite element results. The results of the model experiments show that the modified rigid-jointed beam method can be used to calculate the transverse distribution coefficient of the composite box girder bridge with corrugated steel webs. Compared with the traditional rigid-connected beam method, it has higher calculation precision. (5) the influence of load position on transverse distribution of bending moment of corrugated steel web composite box girder is analyzed by setting different working conditions. The results show that the longitudinal position of load has little effect on the transverse distribution of bending moment, and the transverse distribution coefficient of moment along bridge span can be uniformly calculated by "modified rigid beam method" in practical engineering.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U448.216

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