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本文论述了混凝土斜拉桥主梁截面、塔、索的设计原理以及设计对施工考虑的必要性。文中较为详细地论述了刚性截面与柔性截面的特点,指出采用密索布置时梁体应力与梁高无关而只与截面形状有关。采用柔性截面的主梁能避免索梁温差与收缩徐变在梁截面内产生过大的应力,并有利于施工调索,而其抗风稳定性是良好的。文中列举了若干刚性及柔性梁截面的斜拉桥实例。
This paper discusses the design principle of the main girder section, tower and cable of concrete cable-stayed bridge and the necessity of design consideration for construction. In this paper, the characteristics of rigid section and flexible section are discussed in detail. It is pointed out that the stress of beam body is not related to the height of beam when it is placed in dense cords, but only to the shape of section. The main beam with flexible cross section can avoid the excessive stress in the beam cross section caused by temperature difference and shrinkage creep of the beam, which is good for the construction of the cable and the stability against wind is good. A few examples of cable-stayed bridges with rigid and flexible beam sections are listed in this paper.