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研究了斜拉桥异型钢结构主塔力学特性的影响因素.以安徽涡河三桥为工程实例,通过数值分析得到了主塔钢结构部分和塔根的弯矩、轴力和应力以及主塔最大位移随恒载、主塔高度、塔根无索区长度的变化规律.结果表明,随着恒载及主塔高度的增加,钢结构部分和塔根的弯矩、轴力和压应力以及主塔的最大位移都呈增加的趋势;当恒载增加到1.4倍实际恒载时,钢结构出现局部屈服;主塔高度变化对钢结构部分和塔根的弯矩、轴力和压应力以及主塔刚度均有较明显的影响,因此需合理控制主塔的高度;塔根弯矩的增量比主塔钢结构部分更大;塔根无索区长度增加对主塔受力有利,但考虑到索距及施工的需要,无索区长度应该控制在合理范围内.
The influence factors of the mechanical properties of main tower of profiled steel structure of cable-stayed bridge are studied. Taking Anhui No.3 River Bridge as an example, the bending moment, axial force and stress of the main tower steel structure and tower root are obtained by numerical analysis. The results show that with the increase of dead load and tower height, the bending moment, axial force and compressive stress of steel structure part and tower root, The maximum displacement of the main tower all showed an increasing trend. When the dead load increased to 1.4 times the actual dead load, the local yielding of the steel structure occurred. The bending moment, axial force and compressive stress on the steel structure part and tower root, Therefore, it is necessary to control the height of the main tower rationally; the increment of tower root bending moment is larger than that of the main tower; the increase of the length of the tower without the cable area is beneficial to the tower; Taking into account the distance and construction needs, no-cable length should be controlled within a reasonable range.