| 超大跨径CFRP主缆悬索桥合理结构体系研究 |
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| 引用本文： | 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). |
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| 作者姓名： | 李翠娟 童育强 刘明虎 强士中 |
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| 作者单位： | 1. 西南交通大学,四川,成都,610031
2. 中交公路规划设计院有限公司,北京,100010 |
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| 基金项目： | 国家“八六三”计划项目(2008AA11Z101) |
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| 摘 要： | 采用非线性有限元软件BNLAS进行超大跨径CFRP主缆悬索桥与超大跨径钢主缆悬索桥的静动力特性对比分析,从加劲梁约束体系、主缆安全系数、主缆矢跨比、主缆弹性模量4个方面进行超大跨径CFRP主缆悬索桥合理结构体系研究。结果表明:采用CFRP做超大跨径悬索桥主缆可大幅提高主缆应力中活载应力百分比和自振频率,但活载挠度大幅增加;随着跨径增大,加劲梁约束体系对超大跨径悬索桥的动力特性影响减小,3跨连续漂浮体系作为超大跨径CFRP主缆悬索桥加劲梁的约束体系较优;增大主缆安全系数可提高结构的竖向刚度、竖弯基频和扭转基频,但对横向刚度和横弯基频基本无影响;减小矢跨比可提高结构的竖向和横向刚度以及竖弯基频和横弯基频,但会降低扭转基频;增大CFRP主缆的弹性模量可大幅减小活载竖向挠度,提高竖弯基频和扭转基频,但对横向刚度、横弯基频以及主缆线形和应力基本无影响。
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| 关 键 词： | 超大跨径悬索桥 结构体系 非线性有限元 CFRP主缆 |
Study on the Rational Structure System for Super Large-Span Suspension Bridge with CFRP Main Cables |
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| LI Cuijuan,TONG Yuqiang,LIU Minghu,QIANG Shizhong.Study on the Rational Structure System for Super Large-Span Suspension Bridge with CFRP Main Cables[J].China Railway Science,2011,32(1). |
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| Authors: | LI Cuijuan TONG Yuqiang LIU Minghu QIANG Shizhong |
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| Affiliation: | LI Cuijuan1,TONG Yuqiang2,LIU Minghu2,QIANG Shizhong1(1.Southwest Jiaotong University,Chengdu Sichuan 610031,China,2.Highway Planning and Design Institute of the Ministry of Communications,Beijing 100010,China) |
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| 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 t... |
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| Keywords: | Super large-span suspension bridge Structure system Nonlinear finite element CFRP main cable |
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