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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

38卷

期数:

2021年03期

页码:

62-69

栏目:

出版日期:

2021-05-25

文章信息/Info

Title:

Experiment on Fatigue Stiffness Degradation of Pre-stressed Concrete Box Girder Based on Fundamental Frequency Method

作者:

周宏宇¹,麻全周¹,赵晓花²,袁 慧¹

(1. 北京工业大学 建筑工程学院,北京 100124; 2. 中国建筑技术集团有限公司,北京 100013)

Author(s):

ZHOU Hong-yu¹, MA Quan-zhou¹, ZHAO Xiao-hua², YUAN Hui¹

(1. College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China; 2. China Building Technique Group Co.,Ltd, Beijing 100013, China)

关键词:

基频法;  箱梁;  动测试验;  疲劳累积损伤;  刚度退化

Keywords:

fundamental frequency method;  box girder;  dynamic test;  fatigue cumulative damage;  stiffness degradation

分类号:

TU375.3

DOI:

10.19815/j.jace.2019.10053

文献标志码:

A

摘要:

开展了基于基频法的预应力混凝土箱梁桥模型疲劳试验; 详细介绍了基于基频法的疲劳多级变幅试验加载过程及疲劳加载方案和采集方案; 梳理了动刚度和静刚度的基本原理、基于基频的动刚度计算方法和基于挠度的静刚度计算方法; 对预应力混凝土箱梁的疲劳动刚度和静刚度退化规律进行了研究。结果表明:箱梁构件疲劳裂缝分布、裂缝走向和破坏敏感位置与矩形梁不同,模型梁均首先在腹板产生斜裂缝,腹板斜裂缝主要分布在从支座到1/4跨范围内,不断向顶板和底板斜向延伸; 预应力混凝土箱梁疲劳动刚度和静刚度二者退化规律相同,均呈现为先快速、后平稳的2阶段变化规律; 在疲劳初期,动刚度和静刚度退化率均在40%以上; 疲劳荷载上限值是桥梁结构疲劳刚度退化的一个重要影响因素,疲劳荷载上限值越大,动刚度和静刚度退化幅值就越大,且疲劳剩余刚度越小; 因为二者计算原理不同,所以计算的动静刚度数值也不同,但二者刚度退化规律相同,可相互对比、补充、验证,共同来探究预应力混凝土箱梁疲劳刚度的退化规律。

Abstract:

The model fatigue test of pre-stressed concrete box girder bridge based on the fundamental frequency method was carried out. The loading process of fatigue multi-stage variable amplitude test based on the basic frequency method, as well as the fatigue loading scheme and collection scheme were introduced in detail. The basic principle of dynamic stiffness and static stiffness, the calculation method of dynamic stiffness based on the basic frequency and the calculation method of static stiffness based on deflection were combed. The degradation law of fatigue dynamic stiffness and static stiffness of pre-stressed concrete box girder was studied. The results show that the trend and sensitive position of fatigue crack of box girder are different from those of rectangle girder. The oblique crack of web is mainly distributed in the range from support to 1/4 span, extending to roof and floor. The degradation laws of fatigue labor stiffness and static stiffness of pre-stressed concrete box girder are the same, both of them are fast first and then stable. In the early stage of fatigue, the degradation rate of dynamic stiffness and static stiffness is more than 40%. The upper limit value of fatigue is an important factor of fatigue stiffness degradation of bridge structure, the higher the upper limit value of fatigue, the greater the degradation amplitude of dynamic stiffness and static stiffness, the less residual stiffness. Because of their different calculation principles, the calculated dynamic and static stiffness values are also different, but their stiffness degradation laws are the same, which can be compared, supplemented and verified with each other to explore the degradation laws of fatigue stiffness of pre-stressed concrete box girder.

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备注/Memo

备注/Memo:

收稿日期:2020-07-26
基金项目:国家自然科学基金项目(51978012,51378030); 北京市自然科学基金项目(J160002,8152004)
作者简介:周宏宇(1976-),男,黑龙江延寿人,副教授,工学博士,博士后,E-mail:zhouhy@emails.bjut.edu.cn。

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更新日期/Last Update: 2021-05-20