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为研究斜拉索垂度对大跨、超高斜拉桥拉索长度及索力的影响,采用解析方法研究了斜拉索伸长量及索力与斜拉索荷载、拉索长度及高度的关系,并给出其理论表达式。采用同时考虑斜拉索张拉预应力与重力耦合作用的方法,从而无需假设斜拉索在垂度方向上的变形为悬链线曲线。分析结果表明,斜拉索垂度的关键影响因素是拉重比,即拉索重度与拉索高度之积与拉索应力比;拉索最大挠度处不在拉索中点位置,而是向重力方向有一些偏移,偏移量大小与拉重比成正比;拉索最大挠度值与拉索长度的二次方成正比,与拉重比成反比;当拉重比较小时,本文结果可简化为Ernst公式。
In order to study the effect of diagonal cable sag on the cable length and cable force of long-span and ultra-high-tension cable-stayed bridge, analytical methods were used to study the effects of cable length, cable force and cable load, cable length and height The relationship between the theory and given its theoretical expression. The method of considering the coupling effect of prestressing force and gravity on the tension cable is not necessary to assume that the deformation of the stay cable in the dip direction is a catenary curve. The analysis results show that the key factor affecting the dip of cable is pull weight ratio, which is the ratio of product of cable weight and cable height to cable stress ratio. Cable maximum deflection is not at midline of cable, There is some offset in the direction, and the magnitude of the offset is proportional to the pull-weight ratio. The maximum deflection value of the cable is proportional to the square root of the cable length, which is inversely proportional to the pull-weight ratio. When the pull-weight is small, Ernst formula.