箱梁内钢筋在车辆荷载谱作用下的疲劳分析

尹冠生; 刘晓伟; 侯秀慧

箱梁内钢筋在车辆荷载谱作用下的疲劳分析

1.
长安大学理学院，陕西西安 710064
2.
长安大学建筑工程学院，陕西西安 710064

基金项目:

中国博士后科学基金项目 2013M540724

陕西省交通科技项目 08-09K

详细信息

作者简介:
尹冠生(1958-), 男, 河北石家庄人, 长安大学教授, 工学博士, 从事工程结构力学研究

中图分类号: U448.213
计量
- 文章访问数: 533
- HTML全文浏览量: 86
- PDF下载量: 1127
- 被引次数: 0
出版历程
- 收稿日期: 2013-07-18
- 刊出日期: 2013-12-25

Fatigue analysis of steel bar in box girder under vehicle load spectrum

1.
School of Science, Chang'an University, Xi'an 710064, Shaanxi, China
2.
School of Civil Engineering, Chang'an University, Xi'an 710064, Shaanxi, China

More Information

Author Bio:
YIN Guan-sheng (1958-), male, professor, PhD, +86-29-82334135, yings@chd.edu.cn

摘要

摘要: 通过现场交通调查获得车辆荷载谱, 将车辆行驶时轮胎对桥面的作用看作瞬时的半正弦波冲击荷载。根据轮胎纵向接地压力的分布变化曲线推导了车辆动力放大系数理论公式, 利用瞬态分析计算了不同车轴数车辆通过桥梁时的动力响应, 得到箱梁内钢筋的循环轴向应力变化曲线。使用雨流计数法对钢筋循环轴向应力变化曲线进行分级, 通过试验获得钢筋S-N曲线, 并以线性累积损伤理论计算桥梁使用寿命。数值模拟结果表明: 不考虑路面不平整度的情况下, 动力放大系数在共振点之前, 在零点附近上下波动; 动力放大系数在共振点达到最大, 之后随车速的增加而减小; 正常允许交通载荷不会对桥梁寿命产生不利影响。
- 桥梁工程 /
- 车辆荷载谱 /
- 动力放大系数 /
- S-N曲线 /
- 雨流计数法
Abstract: The vehicle load spectrum was obtained by using traffic survey. The forces of traveling vehicle tires on the ground could be taken as instantaneous half-sine impact loads. Based on the pressure distribution change curve in the longitudinal direction of tire on the ground, a theoretical formula of vehicle dynamic amplification factor (DAF) was deduced. Combining the transient analysis method, the dynamic response was calculated when vehicles with different axles passed through bridge, the cyclic axial stress curves of steel bars in box girder were achieved, and these curves were classified by using rain-flow counting method.S-N curve of steel bar was got through tests, and bridge service life was calculated by using linear cumulative damage theory. Numerical simulation result shows that without considering the roughness degree of pavement, dynamic amplification factor fluctuates near zero before resonance point, and it reaches the maximum at resonance point, then it decreases with the increase of speed. There are no adverse effects on bridge service life under non-overloading traffic.
- bridge engineering /
- vehicle load spectrum /
- dynamic amplification factor /
- S-N curve /
- rain-flow counting method

HTML全文

图 1 雨流计数法程序流程

Figure 1. Program flow of rain-flow counting method

下载: 全尺寸图片幻灯片

图 2 压力变化曲线

Figure 2. Pressure change curve

下载: 全尺寸图片幻灯片

图 3 轮胎地面接触模型

Figure 3. Tire ground contact model

下载: 全尺寸图片幻灯片

图 4 疲劳破坏与拉伸破坏比较及疲劳破坏断面

Figure 4. Comparison of fatigue failure and tensile failure and cross-section of fatigue failure

下载: 全尺寸图片幻灯片

图 5 S-N曲线

Figure 5. S-N curve

下载: 全尺寸图片幻灯片

图 6 网格的划分

Figure 6. Division of grid

下载: 全尺寸图片幻灯片

图 7 箱梁前四阶模态

Figure 7. First four modals of box girder

下载: 全尺寸图片幻灯片

图 8 动力放大系数-车速曲线

Figure 8. D_DAF-v_ccurves

下载: 全尺寸图片幻灯片

图 9 仅考虑轮胎接地长度时D_DAF-v_c曲线

Figure 9. DDAF-vccurve only considering tire contact length

下载: 全尺寸图片幻灯片

图 10 六轴车辆过桥时计算结果

Figure 10. Calculation results of six-axle vehicle through bridge

下载: 全尺寸图片幻灯片

表 1 车辆荷载谱

Table 1. Vehicle load spectrum

下载: 导出CSV

表 2 疲劳试验结果

Table 2. Results of fatigue test

下载: 导出CSV

表 3 箱梁前六阶固有频率

Table 3. First six natural frequencies of box girder

下载: 导出CSV

参考文献(12)

[1]	童乐为, 沈祖炎, 陈忠延. 城市道路桥梁的疲劳荷载谱[J]. 土木工程学报, 1997, 30 (5): 20-27. https://www.cnki.com.cn/Article/CJFDTOTAL-TMGC199705002.htm TONG Le-wei, SHEN Zu-yan, CHEN Zhong-yan. Fatigue load spectrum for urban road bridges[J]. China Civil Engineering Journal, 1997, 30 (5): 20-27. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-TMGC199705002.htm
[2]	夏樟华, 宗周红, 李嘉维, 等. 基于健康监测系统的大跨度连续刚构桥移动荷载识别[J]. 中国公路学报, 2012, 25 (5): 95-104. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL201205021.htm XIA Zhang-hua, ZONG Zhou-hong, LI Jia-wei, et al. Moving load identification of long span continuous rigid frame bridges based on health monitoring system[J]. China Journal of Highway and Transport, 2012, 25 (5): 95-104. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL201205021.htm
[3]	王春生, 陈艾荣, 陈惟珍. 铆接钢桥剩余寿命与使用安全评估实例[J]. 同济大学学报: 自然科学版, 2006, 34 (4): 461-466. doi: 10.3321/j.issn:0253-374X.2006.04.007 WANG Chun-sheng, CHEN Ai-rong, CHEN Wei-zhen. Assessment methods of remaining fatigue life and service safety of riveted steel bridges[J]. Journal of Tongji University: Natural Science, 2006, 34 (4): 461-466. (in Chinese). doi: 10.3321/j.issn:0253-374X.2006.04.007
[4]	黄华. 钢筋混凝土梁桥在车辆荷载谱作用下的动力性能分析[D]. 西安: 长安大学, 2005. HUANG Hua. Mechanical property research of reinofrced concrete beam bridges under automobile load spectrum[D]. Xi'an: Chang'an University, 2005. (in Chinese).
[5]	王硕. 桥梁运营荷载状况研究[D]. 上海: 同济大学, 2007. WANG Shuo. Study on load condition for in-service bridges[D]. Shanghai: Tongji University, 2007. (in Chinese).
[6]	董小红. 既有混凝土桥梁的疲劳寿命和使用安全评估研究[D]. 西安: 长安大学, 2009. DONG Xiao-hong. Assessment of fatigue life and service safety for existing concrete bridges[D]. Xi'an: Chang'an University, 2009. (in Chinese).
[7]	岳峰, 任晓崧, 赵金城, 等. 公路钢桥疲劳车辆荷载研究进展[J]. 建筑钢结构进展, 2009, 11 (2): 35-39. https://www.cnki.com.cn/Article/CJFDTOTAL-JZJZ200902010.htm YUE Feng, REN Xiao-song, ZHAO Jin-cheng, et al. Progress in fatigue loading for highway steel bridges[J]. Progress in Steel Building Structures, 2009, 11 (2): 35-39. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-JZJZ200902010.htm
[8]	李莹. 公路钢桥疲劳性能及可靠性研究[D]. 哈尔滨: 哈尔滨工业大学, 2008. LI Ying. Research on fatigue performance and reliability of highway steel bridges[D]. Harbin: Harbin Institute of Technology, 2008. (in Chinese).
[9]	黄新艺. 混凝土连续曲线梁桥在车辆荷载作用下的动力响应研究[D]. 哈尔滨: 哈尔滨工业大学, 2008. HUANG Xin-yi. Dynamic response research of continuous curved concrete bridges under moving vehicles[D]. Harbin: Harbin Institute of Technology, 2008. (in Chinese).
[10]	朱红兵. 公路钢筋混凝土简支梁桥疲劳试验与剩余寿命预测方法研究[D]. 长沙: 中南大学, 2011. ZHU Hong-bing. Method and experiment research on highway reinforced concrete simply-supported girder bridge's fatigue residual service life forecast[D]. Changsha: Central South University, 2011. (in Chinese).
[11]	刘晓伟. 车辆荷载作用下钢筋混凝土桥梁的疲劳分析[D]. 西安: 长安大学, 2012. LIU Xiao-wei. Fatigue analysis of reinforced concrete bridge under the vehicle load[D]. Xi'an: Chang'an University, 2012. (in Chinese).
[12]	阎楚良, 卓宁生, 高镇同. 雨流法实时计数模型[J]. 北京航空航天大学学报, 1998, 24 (5): 623-624. doi: 10.3969/j.issn.1001-5965.1998.05.033 YAN Chu-liang, ZHUO Ning-sheng, GAO Zhen-tong. Model of rain-flow real-time counting method[J]. Journal of Beijing University of Aeronautics and Astronautics, 1998, 24 (5): 623-624. (in Chinese). doi: 10.3969/j.issn.1001-5965.1998.05.033