正交异性钢桥面板横隔板弧形切口疲劳评价的热点应力法

祝志文; 黄炎; 李健朋; 阮诗鹏

doi:10.19818/j.cnki.1671-1637.2018.05.003

正交异性钢桥面板横隔板弧形切口疲劳评价的热点应力法

doi: 10.19818/j.cnki.1671-1637.2018.05.003

1.
汕头大学工学院, 广东汕头 515063
2.
深圳市建筑工务署工程管理中心, 广东深圳 518031
3.
湖南大学土木工程学院, 湖南长沙 410082

基金项目:

国家重点基础研究发展计划 2015CB057701

国家自然科学基金项目 51878269

汕头大学人才引进科研启动经费项目 NTF18014

详细信息

作者简介:
祝志文(1968-), 男, 湖南益阳人, 汕头大学教授, 工学博士, 从事钢桥疲劳和断裂研究

中图分类号: U448.36
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出版历程
- 收稿日期: 2018-05-02
- 刊出日期: 2018-10-25

Fatigue assessment of floorbeam cutout in orthotropic steel bridge deck based on hot-spot stress method

1.
School of Engineering, Shantou University, Shantou 515063, Guangdong, China
2.
Engineering Management Center, Bureau of Public Works of Shenzhen Municipality, Shenzhen 518031, Guangdong, China
3.
School of Civil Engineering, Hunan University, Changsha 410082, Hunan, China

More Information

Author Bio:
ZHU Zhi-wen(1968-), male, professor, PhD, Zhuzw@stu.edu.cn

摘要

摘要: 借助有限元分析和随机车流下构造细节应力现场监测数据获取了某正交异性钢桥面板横隔板弧形切口疲劳细节一定宽度范围内的应力时程, 分析了应力峰值分布; 基于国际焊接学会和挪威船级社推荐的热点应力外插公式评价了横隔板弧形切口疲劳寿命, 研究了适用于横隔板弧形切口热点应力的外插公式。研究结果表明: 在桥面车辆通行下, 横隔板弧形切口响应为压应力, 且应力峰值大; 横隔板弧形切口不仅产生了显著的应力集中, 且应力沿构造细节最小净截面一定范围呈显著的非线性分布; 因应力插值点位于横隔板弧形切口应力分布的非线性区, 采用国际焊接学会和挪威船级社提出的热点应力插值公式得到的热点应力偏大, 评价的疲劳寿命均偏保守; 提出的两点线性外插公式和三点二次外插公式的应力插值点均位于构造细节应力的线性分布区, 且第1个插值点均距横隔板弧形切口自由边1倍横隔板厚度, 依此方法评价的横隔板弧形切口疲劳寿命与实桥该构造细节的开裂寿命较为一致。正交异性钢桥面板横隔板弧形切口的疲劳性能评价若基于热点应力法开展, 可采用疲劳等级FAT90和建议的三点二次外插公式。
- 桥梁工程 /
- 正交异性钢桥面板 /
- 疲劳 /
- 横隔板弧形切口 /
- 热点应力 /
- 应力监测 /
- 有限元
Abstract: Based on finite element analysis and stress monitoring data at fatigue details under random traffic flows, stress time histories for an area close to a floorbeam cutout of orthotropic steel bridge deck were obtained to analyze the peak stress distribution.Fatigue assessment at a floorbeam cutout was carried out based on the hot-spot stress obtained through the extrapolation formulas specified by the International Institute of Welding and the Det Norske Veritas, respectively.Suitable extrapolation formulas for hot-spot stress at floorbeam cutout were also investigated.Research result shows that under the passage of vehicles on deck, stress responses at floorbeam cutout are compressive, and the peak stress is high. A significant stressconcentration occurs at the free edge of floorbeam cutout, and an obviously nonlinear stress distribution appears in a small range along the critical section of floorbeam cutout.When using the hot-spot extrapolation formulas provided by the International Institute of Welding and the Det Norske Veritas, the hot-spot stress is overestimated and the estimated fatigue life is conservative due to their stress extrapolation points falling into the nonlinear distribution zone.All the stress extrapolation points of the proposed two-point linear extrapolation formula and three-point quadratic extrapolation formula are located on the linear distribution zone of the construction details stress.The first extrapolation point is located on one thickness of floorbeam away from the free edge of the cutout.The fatigue life at floorbeam cutout evaluated by this method agrees well with the observed cracking life of floorbeam cutout on a real bridge.When the hot-spot stress is employed to evaluate the fatigue life of floorbeam cutout of orthotropic steel bridge deck, the fatigue category of FAT90 and the proposed three points quadratic extrapolation formula are suggested.
- bridge engineering /
- orthotropic steel bridge deck /
- fatigue /
- floorbeam cutout /
- hot-spot stress /
- stress monitoring /
- finite element

HTML全文

图 1 缺口应力组成

Figure 1. Components of notch stress

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图 2 横隔板弧形切口母材开裂

Figure 2. Base metal cracking on floorbeam cutout

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图 3 正交异性钢桥面板构造细节

Figure 3. Construction details of orthotropic steel bridge deck

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图 4 应变片组与现场布置

Figure 4. Strain gages array and field installation

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图 5 应变片G₁应力时程

Figure 5. Stress time history of strain gage G₁

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图 6 横隔板弧形切口典型应力响应

Figure 6. Typical stress responses at floorbeam cutout

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图 7 沿横隔板弧形切口最小净截面的应力分布曲线

Figure 7. Stress distribution curves along critical section of floorbeam cutout

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图 8 有限元模型与加载工况

Figure 8. FEM models and loading cases

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图 9 横隔板弧形切口周围米塞斯应力云图

Figure 9. Mises stress contours around floorbeam cutout

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图 10 横隔板弧形切口应力响应随轴组纵桥向的变化

Figure 10. Changes of stress response at floorbeam cutout with axle group in longitudinal direction

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图 11 三种工况最不利轴组位置横隔板弧形切口应力分布

Figure 11. Stress distributions at floorbeam cutout under critical axle group positions of three loading cases

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图 12 基于推荐外插公式计算的热点应力

Figure 12. Calculated hot-spot stresses by recommended extrapolation formulas

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图 13 本文建议的外插公式计算的横隔板弧形切口热点应力

Figure 13. Calculated hot-spot stresses at floorbeam cutout based on extrapolation formulas proposed in this paper

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图 14 横隔板弧形切口热点应力时程

Figure 14. Hot-spot stress time history at floorbeam cutout

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图 15 实测横隔板弧形切口热点应力谱

Figure 15. Measured hot-spot stress spectrum at floorbeam cutout

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表 1 热点应力外插公式

Table 1. Extrapolation formulas for hot-spot stress

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表 2 外插所得热点应力与应变片G₁实测应力比

Table 2. Ratios of hot-spot stress by extrapolation to stress measured by strain gage G₁ %

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表 3 疲劳寿命评价对比

Table 3. Comparison of evaluated fatigue lifes

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