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无桥台斜腿刚架桥因其优越的力学性能和构造特点而得到广泛地应用,但在宽幅桥梁中的应用却鲜见报道。为了研究宽幅无桥台斜腿刚架桥关键部位应力分布规律,以一座宽幅钢筋混凝土无桥台斜腿刚架桥为例,采用Midas/FEA软件对其进行结构计算,分析了宽幅无桥台斜腿刚架桥梁腿刚结部位的复杂应力状态以及主梁控制截面的剪力滞效应。结果表明:宽幅无桥台斜腿刚架桥梁腿刚结部位应力集中现象和主梁控制截面剪力滞效应明显,在进行桥梁结构设计时应予以特别注意;在梁腿结合部位设置中横梁能显著增大结构的横向刚度,达到减少箱梁顶、底板应力峰值,改善结构受力的目的。研究成果可为类似桥梁设计提供理论依据。
The bridge without bridge is widely used because of its superior mechanical properties and structural features, but the application in wide bridges is seldom reported. In order to study the stress distribution law of wide-span non-abutment inclined-legged rigid frame bridge, taking a wide-span reinforced concrete bridge without slant-legged rigid frame bridge as an example, the structure was calculated by using Midas / FEA software, Complicated Stress State of Rigid - knot Section of Skew Leg Rigid Bridges Without Bridge Abutments and Shear Lag Effect of Control Section of Main Girder. The results show that the phenomenon of stress concentration in the rigid-frame bridge leg and the shear lag effect in the control section of the main girder are obvious. Special attention should be paid to the design of the bridge structure; Can significantly increase the lateral stiffness of the structure, to reduce the box girder top and bottom stress peaks, the purpose of improving the structure of the force. The research results can provide theoretical basis for similar bridge design.