Full-scaled model fatigue test of orthotropic steel deck

IF 1.5 Q3 ENGINEERING, CIVIL
Yong Zeng, Xiaofang Xue, Lu Zhang, C. Yang, H. Tan
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引用次数: 0

Abstract

In order to study the fatigue failure behavior and fatigue strength of orthotropic steel deck of urban rail transit steel bridge, a full-scale test model of orthotropic steel deck was established based on the main span beam of a cable-stayed bridge of urban rail transit. During the test, the stress values and the cracking condition of the structure was observed to evaluate the fatigue strength. The results show that there is no crack during 2 million external load cycles, the main tensile stress values of each key test point before and after each cycle have little difference. It shows that there is no obvious redistribution of stress, and the fatigue performance of the model under 2 million external load cycles meets the requirements, and has a certain safety reserve. The load amplitude was increased and another 1.5 million cycles were carried out. When the external load cycles to 3.25 million times, cracks appear at the joint of the plate and U-rib. When the external load cycles to 3.5 million times, cracks are found at the symmetrical position of the first crack, and the test is terminated. The paper provides theoretical and experimental basis for the same type of bridge.
正交各向异性钢甲板全尺寸模型疲劳试验
为了研究城市轨道交通钢桥正交各向异性钢桥面的疲劳破坏行为和疲劳强度,以某城市轨道交通斜拉桥主跨梁为研究对象,建立了正交各向异性钢桥面全尺寸试验模型。在试验过程中,观察了结构的应力值和开裂情况,评价了结构的疲劳强度。结果表明:在200万次外载荷循环过程中均未出现裂纹,各关键试验点在每次外载荷循环前后的主拉应力值差异不大;结果表明,模型在200万次外载荷循环作用下的疲劳性能满足要求,且具有一定的安全储备。增加载荷幅值,再进行150万次循环。当外荷载循环至325万次时,板与u型肋连接处出现裂缝。当外荷载循环至350万次时,在第一次裂纹的对称位置发现裂纹,试验终止。本文为同类型桥梁的设计提供了理论和实验依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.00
自引率
10.00%
发文量
48
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