拱桥吊杆等刚度设计及其动态响应分析

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (4) : 219-225.

论文

拱桥吊杆等刚度设计及其动态响应分析

邵元1.2，孙宗光1，陈一飞1

作者信息 +

Study on equal stiffness design of arch bridge suspenders and its dynamic response analysis

Shao Yuan1.2 Sun Zong-guang1 Chen Yi-fei1

Author information +

文章历史 +

摘要

针对中承式拱桥结构中短吊杆处较易率先疲劳破坏的情况，分析各个吊杆处的刚度差异。以某中承式钢管混凝土拱桥主跨吊杆为研究对象，通过调整吊杆单元的弹性模量对吊杆进行等刚度设计，采用车桥耦合迭代的计算方法，得到车辆荷载作用下吊杆的应力响应曲线并计算冲击系数。对拱桥吊杆的动态响应进行分析并与初始模型情况比较，结果表明：等刚度模型短吊杆应力有明显下降，各吊杆间应力差异降低；吊杆的冲击系数降低，长短吊杆间冲击系数之差减小幅度达到50%；不平度等级对冲击系数的放大作用不随刚度调整而改变。说明对拱桥吊杆进行等刚度设计能够有效的平衡吊杆受力情况，使吊杆受到的冲击作用较为均匀，提高吊杆耐久性，为实际工程应用提供依据。

Abstract

According to condition of the short suspenders in half-through arch bridge structure are easier to be ruined firstly, the stiffness difference of each suspender departments is analyzed. Taking a half-through concrete-filled-steel-tube arch bridge as the object of study, the elastic modulus of suspender element is adjusted to make the equal stiffness design. The stress response curve of suspenders is obtained and the impact coefficient is calculated under the vehicle load with vehicle-bridge coupling method. Compared with the initial model, dynamic response of arch bridge suspenders is analyzed. The results show that the stress of short span is apparent decline in equal stiffness model and the stress difference of each suspender is reduce; the suspender impact coefficient is reduce and the difference between short and long suspender is reduced as high as 50%; the amplification of roughness level on impact coefficient does not change with stiffness adjustment. It is shown that equal stiffness design for arch bridge suspenders can effectively balance the suspender stress, and make the impact effect more uniform. The durability of suspenders is enhanced to provide the basis for practical engineering application.

导出引用

邵元1.2，孙宗光1，陈一飞1. 拱桥吊杆等刚度设计及其动态响应分析[J]. 振动与冲击, 2018, 37(4): 219-225

Shao Yuan1.2 Sun Zong-guang1 Chen Yi-fei1. Study on equal stiffness design of arch bridge suspenders and its dynamic response analysis[J]. Journal of Vibration and Shock, 2018, 37(4): 219-225

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