基于调研数据的部分斜拉桥设计关键参数研究

Study on Key Parameters of Partially Cable-stayed Bridge Design Based on Research Data

针对部分斜拉桥设计关键参数缺少足够规范指导的问题,通过对国内外的部分斜拉桥进行设计主要参数调研统计,并与现有相关规范、科研成果进行对比研究,讨论了部分斜拉桥各型结构体系适用性、拉索布置形式,总结给出拉索倾角和间距、边主跨比、塔跨比、索梁刚度比和无索区长度等重要设计参数取值范围。结果表明,拉索倾角一般为11°~35°,主梁上拉索间距一般采用3.5 m~8 m,塔上的拉索间距一般采用0.5 m~1.2 m;3跨布置时,边主跨比一般集中在0.41~0.70,塔跨比宜采用1/3~1/13,索梁刚度比宜小于30;主跨跨中无索区长度与跨径之比宜取0.06~0.21。

For the problem of lack of sufficient specification guidance on key design parameters for partially cable-stayed bridges,some partially cable-stayed bridges at home and abroad were surveyed and their main parameters were compared and studied with existing relevant regulations and scientific research achievements.The applicability of various structural systems and cable arrangement forms for partially cable-stayed bridges,as well as the value range of important design parameters such as cable inclination angle and spacing,side-to-main span ratio,tower-to-span ratio,cable-to-beam stiffness ratio,and length of the cable-free zone were discussed.According to the results,the cable inclination angle is generally 11 to 35°,the spacing between cables on the main beam is generally 3.5 to 8 m,and the spacing between cables on the tower is generally 0.5 to 1.2 m.When three spans are arranged,the side-to-main span ratio is generally concentrated between 0.41 and 0.70,and the tower to span ratio should be between 1/3 and 1/13.The cable beam stiffness ratio should be less than 30.The ratio of the length of the cablefree zone in the middle span to the span should be between 0.06 and 0.21.