Abstract：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 on the deflection of midspan and the anti-slip coefficient between main cable and saddle were calculated and studied by changing 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.
李万恒 王元丰 李鹏飞 吴寒亮. 三塔悬索桥桥塔适宜刚度体系研究[J]. 土木工程学报, 2017, 50(1): 75-81.
Li Wanheng Wang Yuanfeng Li Pengfei Wu Hanliang. Rational distribution principle for the pylon stiffness of three-pylon suspension bridges. 土木工程学报, 2017, 50(1): 75-81.
