摘要
基于悬索桥的传力特点,提出主塔纵向受力简化分析模型,对中、边跨主缆的内力及线形进行分析,根据主缆无应力长度相等的原则推导出塔顶位移、塔底弯矩和轴力的计算公式.分别以主跨为1000米的单跨及三跨悬索桥为例,利用简化计算方法对主塔的纵向受力进行了计算,并与有限元计算结果进行对比分析.结果表明,简化公式具有良好的计算精度,且可同时适用于单跨及三跨悬索桥,满足了概念设计的要求.
Based on the path of force conduction of suspension bridge towers, a simplified analytical model for their longitudinal mechanical properties is proposed. The internal force and line shape of main cable are analyzed, Explicit formulations about the displacement, bending moment and axial force of the towers are obtained based on the constant unstressed length. Both single-span and three-span suspension bridges with length of 1 000 m are took as examples. The mechanical indexes of the towers are calculated by the proposed formulations. A comparison between the simplified results and nmuerical results shows a good accuracy of the simplified analytical method. All the proposed formulations are proved applicable to both single-span and three-span suspension bridges.
出处
《深圳大学学报（理工版）》
EI
CAS
北大核心
2009年第4期389-393,共5页
Journal of Shenzhen University(Science and Engineering)
基金
高等学校博士学科点专项科研基金资助项目(20050247029)
关键词
桥梁结构设计
主缆线形
无应力索长
主塔受力
bridge structural design
configuration of main eable
unstressed length of eable
mechanical property of towers
