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地锚式独斜塔斜拉桥受力特性不同于普通斜拉桥。为研究其受力特点,将主梁上的斜拉索力简化为连续的均布作用力,在索塔两侧的斜拉索力各自简化为锚固区中心位置的集中力。推导了均布力荷载作用下,地锚式单跨独斜塔斜拉桥主梁和主塔的无量纲平衡方程。利用方程计算了在建的芙蓉江大桥挠曲线、弯矩和主塔偏位等关键力学响应,并采用有限元方法进行验证。对比分析表明:简化的力学模型计算结果除主梁最大正弯矩外其他均与有限元分析结果吻合良好,验证了力学模型的正确性。
The anchorage type single inclined tower cable-stayed bridge is different from ordinary cable-stayed bridge in its mechanical characteristics. In order to study the characteristics of its force, the inclined cable force on the main beam is simplified as a continuous uniform force, and the inclined cable forces on both sides of the cable tower are respectively reduced to the concentrated force at the center of the anchorage zone. The dimensionless balance equation between the main girder and the main tower of the ground anchored single-span single-leaning tower cable-stayed bridge under uniform load is deduced. The key mechanical responses of the Furong River Bridge under construction such as flexural curve, bending moment and deviation of the main tower are calculated by the equations and verified by the finite element method. The comparative analysis shows that the calculated results of the simplified mechanical model are in good agreement with the results of the finite element analysis except for the maximum positive moment of the main girder, which proves the correctness of the mechanical model.