隔板式曲线组合梁弯扭特性的实验及理论研究

发布时间：2018-06-13 09:00

本文选题：钢－混凝土曲线组合梁 + 模型试验　；参考：《石家庄铁道大学》2014年硕士论文

【摘要】：钢－混凝土组合梁由于自重轻、便于架设、抗震性能好、结构稳定等优点，在中等跨径的直线桥梁及具有平曲线的曲线桥梁中得到了广泛的应用。曲线组合梁在荷载作用下会产生复杂的弯扭耦合效应，目前对这一方面的研究还有待深入。本文依托国家自然科学基金资助项目《隔板式曲线组合梁桥弯扭作用机理及横隔板影响效应研究》(51108281)，以跨径比(计算跨度与曲线半径的比值)和横隔板数为参数，进行了六片简支曲线组合梁的静载模型试验，采用ANSYS软件对其进行了有限元数值分析，并采用M/R法和荷载分解法对曲线组合梁的扭转效应进行了研究，主要结论如下： (1)随着跨径比的增大，曲线组合梁的刚度下降，承载力降低，破坏形态逐渐由弯曲破坏过渡为弯扭破坏，跨径比越大，弯扭破坏的特征越明显。横隔板对曲线组合梁的整体受力性能影响不大； (2)曲线组合梁切向应变沿截面竖向基本符合平截面假定；切向应变与径向应变均随跨径比的增大而增大，沿截面横向，均在有横隔板处表现为曲线内侧小外侧大，无横隔板处则内侧大外侧小； (3)曲线组合梁的切向滑移和径向滑移均随跨径比的增大而增大，横隔板数目对其影响很小。切向滑移沿梁轴的分布规律与竖向剪力基本相同，径向滑移数值很小，但在横隔板位置产生突变； (4)刚性扭转翘曲正应力、畸变翘曲正应力、刚性扭转角、畸变角和翘曲变形均随跨径比的增大而增大，随剪力连接度的增大而减小。有无横隔板对刚性扭转翘曲正应力和刚性扭转角影响不大，但畸变翘曲正应力在有横隔板截面和无横隔板截面的横向分布规律相反，畸变角在横隔板处明显减小。
[Abstract]:Steel-concrete composite beams are widely used in straight bridges with medium span and curved bridges with flat curves due to their advantages of light weight, easy erection, good seismic performance and structural stability. The bending and torsional coupling effect of curved composite beam is complex under load, and the research on this aspect needs to be further studied at present. In this paper, based on the project supported by National Natural Science Foundation < Research on bending and torsion Mechanism and effect of Transverse diaphragm of curved Composite girder Bridges supported by National Natural Science Foundation ", the span ratio (the ratio of span to curve radius) and the number of transverse partitions are taken as parameters, and the span ratio (the ratio of span to curve radius) and the number of transverse baffles are taken as parameters. The static model tests of six simply supported curved composite beams are carried out, and the finite element numerical analysis is carried out with ANSYS software. The torsional effect of curved composite beams is studied by means of M / R method and load decomposition method. The main conclusions are as follows: (1) with the increase of span / diameter ratio, the stiffness of curved composite beams decreases, the bearing capacity decreases, and the failure form gradually changes from bending failure to bending and torsional failure. The larger the span / diameter ratio is, the more obvious the characteristics of bending and torsional failure are. The transverse diaphragm has little effect on the overall mechanical performance of the curved composite beam; the tangential strain of the curved composite beam basically accords with the assumption of plane section along the vertical direction of the section; the tangential strain and radial strain increase with the increase of span ratio. Along the cross section, the small lateral side of the curve is larger at the point where there is a transverse partition, and the outside side is large and small in the place without the transverse partition, the tangential slip and radial slip of the curved composite beam increase with the increase of the span / diameter ratio, and the radial slip of the composite beam increases with the increase of the span / diameter ratio. The number of transverse partitions has little effect on it. The distribution of tangential slip along the beam axis is basically the same as the vertical shear force, but the radial slip value is very small, but there is a sudden change in the position of the transverse spacer. (4) rigid torsional warpage normal stress, distortion warpage normal stress, rigid torsional angle, Both distortion angle and warping deformation increase with the increase of span / diameter ratio and decrease with the increase of shear connection degree. There is little effect on the normal stress and the angle of rigid torsion with or without transverse diaphragm, but the transverse distribution of distortion normal stress in section with and without transverse diaphragm is opposite, and the distortion angle decreases obviously at the transverse diaphragm.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.216;U441

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