摘要
不同塔梁结合情况下的桥塔适宜刚度体系的研究对三塔悬索桥具有重要的意义。以泰州长江公路大桥为依托背景,针对塔梁固结体系、塔梁漂浮体系、塔梁半漂浮体系,通过改变中塔刚度,计算分析了中边塔刚度比、中塔刚度对跨中最大挠度和主缆抗滑移系数的影响。结果表明:主缆与鞍座间的摩擦系数取0.2的情况下,对于塔梁固结和半漂浮体系能够找到同时满足挠跨比限值(1/250~1/300)和抗滑移系数限值(2.0)的合理中塔刚度区间,对于塔梁漂浮体系不能找到同时满足挠跨比限值和抗滑移系数限值的合理中塔刚度区间。中边塔的刚度比不能有效反映桥塔刚度体系对跨中最大挠度和主缆抗滑移系数的影响,中塔的绝对刚度是二者的主要影响因素。适当地提高主缆与鞍座间的摩擦系数的取值能够增加中塔刚度的选择范围,具有较高的经济性和实用价值,建议三塔悬索桥中主缆与鞍座间的摩擦系数选取值可以放宽到0.25~0.3之间。
The rational distribution of pylon stiffness is an essential problem for studying three-pylon suspension bridges, especially when the pylon-girder connections are considered in different types. In this study, with the Taizhou Yangtze River Bridge taken as an example, three-pylon suspension bridges were simulated using FEM, and the pylon-girder connections in the bridges were considered as consolidation type, floating type and semi-floating type, respectively. The influence of stiffness ratio of mid-pylon to side pylon and stiffness of mid-pylon slip coefficient between main cable and saddle were calculated and studied by c on the deflection of midspan and the anti- hanging the distribution of pylon stiffness. The results show that for consolidation-type or semi-floating type pylon-girder connections, the deflection-span ratio and anti-slip coefficient in the reasonable ranges can be found concurrently, while for floating-type pylon-girder connections, they cannot be found concurrently, when the friction coefficient between the main cable and saddle is 0.2. The mid-pylon stiffness cannot reflect the relationship between the deflection-span ratio and the anti-slip coefficient of cable, and the absolute stiffness of mid-pylon is the main influence factors for the deflection-span ratio and the anti-slip coefficient. Appropriate increasing of friction coefficient between cable and saddle can increase the range of mid-pylon stiffness, which may lead to high economic and practical value. The value of friction coefficient may be relaxed to be between 0.25 and 0.3.
出处
《土木工程学报》
EI
CSCD
北大核心
2017年第1期75-81,共7页
China Civil Engineering Journal
基金
"十一五"国家科技支撑计划(2009BAG15B01)
关键词
三塔悬索桥
挠跨比
抗滑移系数
摩擦系数
中塔刚度
three-pylon suspension bridge
deflection-span ratio
cable anti-slip coefficient
friction coefficient
mid- pylon stiffness
作者简介
李万恒（1972-），男，博士研究生，研究员。主要从事服役桥梁性能研究。
王元丰（1967-），男，博士，教授。主要从事混凝土徐变、服役桥梁性能研究。
李鹏飞（1984-），男，博士，副研究员。主要从事服役桥梁性能研究。
吴寒亮（1980-），男，博士，副研究员。主要从事服役桥梁性能研究。
