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本文以一座跨径为100m的三索面地锚式斜拉桥为工程背景,采用刚性支撑连续梁法并结合最小弯曲能量法、假载法进行计算分析确定合理的成桥索力。依照静力平衡条件得到主梁初始断面尺寸;然后运用最小弯曲能量法从而促使桥梁处于恒定荷载的状态时,同时还要保证斜拉桥处于的主梁和主塔的弯矩值均较小,且索力值变化基本均匀的状态,进而可以通过假载法进行校核,以保证各控制断面在最不利荷载组合时的弯矩值在规范允许范围内。研究表明,对三索面地锚式斜拉桥成桥恒载下的索力进行确定的方法与一般的直线塔斜拉桥有许多的相似点;其索力由距离桥塔较近的一端至较远的一端呈现出的分布规律为由小至大,主梁侧索力明显大于地锚侧索力,以此来平衡倾斜桥塔的重量。
In this paper, a three-cable ground-supported cable-stayed bridge with a span of 100m is taken as the engineering background. The rigid support continuous beam method and the minimum bending energy method are used to calculate and analyze the reasonable cable tension. The initial cross-sectional size of the main girder is obtained according to the static equilibrium condition; then the minimum bending energy method is adopted to promote the constant load of the bridge, meanwhile, the bending moment of the main girder and the main tower at the cable- And the force value changes substantially uniform state, which can be checked by the method of false load to ensure that the control section in the most unfavorable load combinations when the bending moment within the allowable range of the specification. The research shows that there are many similarities between the three cable-stayed cable-stayed bridges and the ordinary straight-line cable-stayed bridge under constant load. To the far end of the distribution of the law showed ascending to the main side of the girder side of the cable was significantly greater than the side of the cable-side force, in order to balance the tilt tower weight.