[1]刘问,徐世烺,李庆华.后浇UHTCC既有混凝土复合梁弯曲疲劳性能试验研究[J].东南大学学报(自然科学版),2013,43(2):409-413.[doi:10.3969/j.issn.1001-0505.2013.02.034]
 Liu Wen,Xu Shilang,Li Qinghua.Experimental study on flexural fatigue property of existing concrete beams restricted by post-poured UHTCC layer[J].Journal of Southeast University (Natural Science Edition),2013,43(2):409-413.[doi:10.3969/j.issn.1001-0505.2013.02.034]
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后浇UHTCC既有混凝土复合梁弯曲疲劳性能试验研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
43
期数:
2013年第2期
页码:
409-413
栏目:
土木工程
出版日期:
2013-03-20

文章信息/Info

Title:
Experimental study on flexural fatigue property of existing concrete beams restricted by post-poured UHTCC layer
作者:
刘问13徐世烺2李庆华2
1北京林业大学水土保持与荒漠化防治教育部重点实验室, 北京 100083; 2浙江大学高性能建筑结构与材料研究所, 杭州 310058; 3大连理工大学结构研究所, 大连 116024
Author(s):
Liu Wen13 Xu Shilang2 Li Qinghua2
1Key Laboratory of Soil and Water Conservation and Desertification Combating of Ministry of Education, Beijing Forestry University, Beijing 100083, China
2Institute of Advanced Engineering Structures and Materials, Zhejiang University, Hangzhou 310058, China
3Institute of Structural Engineering, Dalian University of Technology, Dalian 116024, China
关键词:
复合梁 弯曲疲劳 平截面假定 三阶段变形 S-N双对数曲线
Keywords:
composite beam flexural fatigue plane section assumption three-stage deformation S-N bi-logarithm curve
分类号:
TU317.1;TU502.6
DOI:
10.3969/j.issn.1001-0505.2013.02.034
摘要:
为研究疲劳荷载作用下超高韧性水泥基复合材料(UHTCC)对混凝土的增强作用,将UHTCC外浇层作为保护层,对既有着混凝土梁体一侧浇注UHTCC而制成的UHTCC/混凝土复合梁(UC复合梁)进行三点弯曲疲劳加载试验.实验结果表明:在疲劳荷载作用下,UC梁截面变形符合平截面假定;UHTCC层产生若干条可见裂缝,其数目随应力水平的下降而减少,混凝土层裂缝数目为1~3;复合梁随荷载循环的疲劳变形曲线表现出延性特征,呈现三阶段发展,变形能力随应力水平的下降而降低;在高周疲劳情况下,复合梁S-N双对数疲劳曲线线性良好.由此表明,利用超高韧性水泥基复合材料作为保护层能分散既有混凝土的表面裂缝,提高复合梁的变形能力和寿命.
Abstract:
In order to investigate the enhancing effect of ultra-high toughness cementitious composites(UHTCC)on plain concrete under fatigue loads, three-point flexural fatigue tests on existing concrete beam with new UHTCC layer(UC composite beam)being poured on one side were carried out. The experimental results show that the plane section assumption is applicable for the UC beams under fatigue loads. Several visible cracks are formed in the UHTCC layer. The number of the cracks decreases with the decrease of the stress levels, while 1 to 3 cracks are observed in the concrete layer. The multiple-cracking characteristic of the composite beam exhibits three-stage ductile fatigue deformation, and the deformation ability decreases with the decrease of the fatigue stress levels. Under high cycle fatigue, the S-N bi-logarithm curve behaves linearly. Therefore, UHTCC can be used as a protective layer to redistribute and disperse the fatigue cracks in the existing concrete. It can increase the deformation capacity and prolong the fatigue life of the composite beam.

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备注/Memo

备注/Memo:
作者简介: 刘问(1983—),女,博士,讲师,liuwen@bjfu.edu.cn.
基金项目: 国家水体污染控制与治理科技重大专项资助项目(2012ZX07308-001)、国家自然科学基金资助项目(51008270).
引文格式: 刘问,徐世烺,李庆华.后浇UHTCC既有混凝土复合梁弯曲疲劳性能试验研究[J].东南大学学报:自然科学版,2013,43(2):409-413. [doi:10.3969/j.issn.1001-0505.2013.02.034]
更新日期/Last Update: 2013-03-20