曲线连续结合梁桥的剪力键受力分析

该文针对大跨曲线结合梁弯扭耦合现象,首先建立全板壳单元模型,考虑混凝土板与钢梁之间水平滑移效应。然后分析和研究剪力连接件在各种荷载作用下剪力的分布规律,明确其受力特点。计算表明,对于单箱双室的主梁结构,中腹板剪力键承受的纵向水平力稍大于边腹板,横向水平力则主要由边腹板剪力键承担。最后分析了剪力键不同连接刚度对结构的影响。结果表明,连接刚度的改变,钢梁上翼缘的应力变化最大,其次是混凝土板应力,钢梁下翼缘的应力基本无影响。

Analysis on Shear Key Stress of Curved Continuous Composite Beam Bridge

Aiming at the coupled bending-torsional phenomenon of long-span curved composite beam,the article sets up the full flat Shell element model,considers the horizontal slip effect between concrete slab and steel beam,analyzes and studies the shear distribution rule of shear connector under various loading actions,and makes clear its stress characteristics.The calculation shows that the longitudinal horizontal force born by the shear key of the middle web is slightly larger than the side web,and the transverse horizontal force is mainly born by the shear key of side web for the single-box double-cell main beam structure.The article analyzes the influence of the different connecting rigidities of the shear key on the structure.The result makes clear that the stress variation at the upper edge of steel beam is the maximum,secondarily the stress of concrete plate,and basically no influence on the stress of lower edge of steel beam if the connecting rigidity is changed.