曲线U型钢与混凝土组合梁界面滑移及轴向力研究

Study on Interface Slip and Axial Force of Curved U-Steel and Concrete Composite Beams

目的研究曲线U型钢与混凝土组合梁界面滑移以及轴向力的计算,为工程实践中曲线桥梁的建设提供参考。方法以弹性理论为基础,建立曲线U型钢与混凝土组合梁的界面滑移及轴向力基本方程,给出曲线组合梁在竖向均布荷载作用时的界面滑移及轴向力计算公式,并分析其中5种设计参数的影响。结果随着荷载增加,界面滑移值及轴向力增加;连接刚度增大时,界面滑移值减小而轴向力增大;构件尺寸增大时,滑移值及轴向力均减小;混凝土强度等级影响最不明显;U型钢梁高度增大时,滑移值及轴向力均减小。结论在设计中应着重考虑曲线组合梁连接刚度及作用荷载值的影响,可为工程实践中曲线桥梁的建设提供参考。

The calculation of interface slip and axial force of U-shaped steel and concrete composite beam were studied to provide references for the construction of curved bridges in engineering practice.Based on the elastic theory,the differential equation of interface slip of curved composite beams and the differential equation of axial force control under the influence of slip are established,and the theoretical calculation formulas for vertical uniform load is also gave.The influence of five design parameters on interface slip value and axial force is calculated and analyzed.As the load increases,the amount of interface slip and axial force increase;as the stiffness of connector increases,the amount of interface slip decreases and the axial force increases;as the height and width of the concrete slab increase,the slip value and axial force decrease;the change in radius of curvature has little effect;when the height of U-shaped steel beam increases,the slip value and axial force decrease.The influence of connection stiffness and action load value of curved composite beams should be considered in the design,which can provide a reference for the construction of curved bridges in engineering practice.