中国铁道科学2011，Vol.32Issue(1)：62-67,6.
超大跨径CFRP主缆悬索桥合理结构体系研究
Study on the Rational Structure System for Super Large-Span Suspension Bridge with CFRP Main Cables
摘要
Abstract
BNLAS (Bridge NonLiner Analysis System) is a nonlinear finite element program. Using BNLAS, the differences between the super large-span suspension bridge with CFRP cables and the super large-span suspension bridge with steel cables were researched and the influences of the restraint systems of the stiffening girder, main cable safety factor, rise-span ratio and cable elastic modulus on the static and dynamic performances of the super large-span suspension bridge with CFRP cables were analyzed. The results show that after using CFRP, the percentage of live load stress in cables, the natural vibration frequency and the displacement of the stiffening girder caused by live load are increased significantly. With the increase of the span, the influence of the restraint systems of the stiffening girder on the dynamic characteristics of the super large-span suspension bridge becomes smaller. 3-span continuous floating system is more favorable to be the restraint system of the stiffening girder for super large-span suspension bridge with CFRP cables. Increasing the safety factor of the main cable can improve structural vertical stiffness and the basic frequency of vertical bending and torsion, but affects little the structural lateral stiffness and the basic frequency of lateral bending. Decreasing the rise-span ratio can increase the structural stiffness and the basic frequency of vertical bending and lateral bending, but lower the basic frequency of torsion. Improving the CFRP cable elastic modulus can greatly decrease the vertical displacement of the stiffening girder caused by live load and increase the basic frequency of vertical bending and torsion, but affects little the structural lateral stiffness, the basic frequency of lateral bending and the shape and the stress of CFRP cable.关键词
超大跨径悬索桥/结构体系/非线性有限元/CFRP/主缆分类
交通工程引用本文复制引用
李翠娟,童育强,刘明虎,强士中..超大跨径CFRP主缆悬索桥合理结构体系研究[J].中国铁道科学,2011,32(1):62-67,6.基金项目
国家"八六三"计划项目(2008AA11Z101) （2008AA11Z101）
