|Table of Contents|

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

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

Issue:
2021年03期
Page:
62-69
Research Field:
Publishing date:

Info

Title:
Experiment on Fatigue Stiffness Degradation of Pre-stressed Concrete Box Girder Based on Fundamental Frequency Method
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)
Keywords:
fundamental frequency method;  box girder;  dynamic test;  fatigue cumulative damage;  stiffness degradation
PACS:
TU375.3
DOI:
10.19815/j.jace.2019.10053
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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Last Update: 2021-05-20