斜桥动力特性

夏桂云; 俞茂宏; 李传习; 张建仁

doi:10.19818/j.cnki.1671-1637.2009.04.004

斜桥动力特性

doi: 10.19818/j.cnki.1671-1637.2009.04.004

1.
长沙理工大学土木与建筑学院, 湖南长沙 410076
2.
西安交通大学土木工程系, 陕西西安 710049

基金项目:

国家自然科学基金项目 50778024

长沙理工大学人才基金项目 1004171

详细信息

作者简介:
夏桂云(1972-), 男, 湖南湘阴人, 长沙理工大学副教授, 工学博士, 从事桥梁工程研究

中图分类号: U441.3
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- 被引次数: 0
出版历程
- 收稿日期: 2009-01-25
- 刊出日期: 2009-08-25

Vibrating characteristics of skew bridge

1.
School of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha 410076, Hunan, China
2.
Department of Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China

More Information

Author Bio:
XIA Gui-yun (1972-), male, associate professor, PhD, +86-731-82617746, xiagy72@163.com

摘要

摘要: 为了解斜桥振动频率的变化规律和冲击系数的合理取值, 建立了等截面斜桥振动频率的超越方程和斜桥静、动力分析的有限元列式, 用解析法和有限元法分析了斜度、支承方式、弯扭刚度比等结构参数对单跨斜桥结构前5阶振动频率的影响, 对一座20 m跨空心板不同斜度的振动频率进行了现场测试和理论分析, 最后对单跨斜桥车-桥系统的振动进行了研究, 考察了车速、斜度对结构动挠度、动弯矩的影响。计算结果表明: 斜度、支承方式对斜桥动力特性有重要影响, 车辆的冲击效应与车速没有单调变化规律, 挠度和弯矩的冲击系数不同。
- 桥梁工程 /
- 斜桥 /
- 有限元 /
- 理论公式 /
- 频率 /
- 冲击效应
Abstract: To explore the change rules of vibrating frequencies and gain the rational impact factors of skew bridge, the transcendent equation of vibrating frequency and the finite element formulations of static and dynamic force analysis were derived.The influences of obliquity, supporting manner and the ratio of flexural stiffness to torsion stiffness on the first five order frequencies of single span skew bridge were studied.The vibrating frequencies under different obliquities for a 20 m-length void slab were tested and analyzed.The interaction of vehicle-bridge system for single span skew bridge was studied, and the influences of vehicle velocity and obliquity on the dynamic deflection and dynamic moment were investigated.Calculational result indicates that for skew bridge, obliquity and supporting manner have important influences on dynamical characteristics, the impact effect of vehicle has no harmonious changing rule with vehicle velocity, and the impact factors of deflection and moment are different.
- bridge engineering /
- skew bridge /
- finite element /
- theoretic formula /
- frequency /
- impact effect

HTML全文

图 1 单跨斜桥

Figure 1. Single span skew bridge

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图 2 多跨连续斜桥

Figure 2. Multi-span continuous skew bridge

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图 3 斜梁单元

Figure 3. Element of skew girder

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图 4 两端斜度相同的单跨斜桥

Figure 4. Single span skew bridge with same obliquity

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图 5 A型斜桥频率变化曲线

Figure 5. Change curves of frequencies for A skew bridge

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图 6 梯形斜桥

Figure 6. Trapezoidal skew bridge

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图 7 梯形斜桥频率变化曲线

Figure 7. Change curves of frequencies for trapezoidal skew bridge

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图 8 等腰梯形斜桥

Figure 8. Isoceles trapezoid skew bridge

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图 9 对称斜桥频率变化曲线

Figure 9. Change curves of frequencies for symmetrical skew bridge

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图 10 0振动频率变化曲线

Figure 10. Change curves of vibration frequencies

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图 11 斜交空心板横截面

Figure 11. Cross section of skew void slab

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图 12 斜交空心板试验测试装置

Figure 12. Test model of skew void slab

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图 13 斜交空心板基频对比

Figure 13. Frequency comparison of skew void slab

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图 14 不同车速时跨中截面挠度随车辆位置变化

Figure 14. Deflection changes of midspan section with vehicle position under different velocities

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图 15 不同车速时跨中截面弯矩随车辆位置变化

Figure 15. Moment changes of midspan section with vehicle position under different velocities

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图 16 不同Ф时跨中截面挠度随车辆位置变化

Figure 16. Deflection changes of midspan section with vehicle position under different Ф

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图 17 不同Ф时跨中截面弯矩随车辆位置变化

Figure 17. Moment changes of midspan section with vehicle position under different Ф

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图 18 不同车速下的挠度、弯矩冲击系数

Figure 18. Impact factors of deflection and moment under different vehicle velocities

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