超大跨径CFRP主缆悬索桥动力特性参数分析

发布时间：2018-01-07 15:32

本文关键词：超大跨径CFRP主缆悬索桥动力特性参数分析　出处：《西南交通大学学报》2014年03期 　论文类型：期刊论文

【摘要】：为了研究超大跨径碳纤维(CFRP)主缆悬索桥的动力性能,以某海峡为工程背景,设计了主跨3 500 m的CFRP主缆悬索桥.基于ANSYS软件平台,分析了该CFRP主缆悬索桥的动力特性,探讨了矢跨比、主缆安全系数、加劲梁约束体系和桥塔刚度等主要结构参数对其动力特性的影响.研究结果表明:矢跨比越大,扭弯频率比越大;主缆安全系数对动力特性影响不大;随跨径增大,加劲梁约束体系对动力特性的影响减小;增大桥塔顺桥向弯曲刚度可以提高对称竖弯基频,增大桥塔抗扭刚度可提高扭转基频.
[Abstract]:In order to study the large span of carbon fiber (CFRP) and dynamic performance of the main cable of suspension bridge, a channel for the engineering background, the design of CFRP main cable suspension bridge with the main span of 3500 m. ANSYS software platform based on the analysis of the dynamic characteristics of the CFRP of the main cable of suspension bridge, discusses the span ratio, main cable safety factor the influence of structural parameters, restraint systems of the stiffening girder and pylon stiffness on the dynamic characteristics. The results show that the ratio of rise to span the greater bend frequency ratio is larger; the main cable safety coefficient has little influence on the dynamic characteristics; with the increase of the span, reduce the influence of restraint systems of the stiffening girder on the dynamic characteristics of the tower along the increase; the bridge bending stiffness can improve the symmetrical vertical bending frequency, increasing the torsional stiffness of pylon can improve the torsional frequency.

【作者单位】：西南交通大学土木工程学院;
【基金】：国家自然科学基金资助项目(51308466) 中央高校基本科研业务费专项资金资助项目(SWJTU12BR033) 高等学校博士学科点专项科研基金资助项目(20130184120004)
【分类号】：U448.25
【正文快照】： 悬索桥[1]是跨越能力最强的桥型,这是毋庸置疑的.但是,随着跨径的增大,主缆应力中自重应力的比例越来越大,这将是悬索桥突破跨越能力的一个瓶颈.CFRP[2-5]是一种复合材料,它具有强度高、质量轻、耐腐蚀、热膨胀系数低等优点,而且松弛、疲劳等重要指标均优于钢材,特别适合用作

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