[1]陈庆军,蔡健,吴轶,等.双重环筋约束下超短混凝土试件的局部受压试验研究[J].东南大学学报(自然科学版),2010,40(1):165-170.[doi:10.3969/j.issn.1001-0505.2010.01.031]
 Chen Qingjun,Cai Jian,Wu Yi,et al.Local compression experiment on super short concrete member with confinement of double layer circular steel bars[J].Journal of Southeast University (Natural Science Edition),2010,40(1):165-170.[doi:10.3969/j.issn.1001-0505.2010.01.031]
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双重环筋约束下超短混凝土试件的局部受压试验研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
40
期数:
2010年第1期
页码:
165-170
栏目:
土木工程
出版日期:
2010-01-20

文章信息/Info

Title:
Local compression experiment on super short concrete member with confinement of double layer circular steel bars
作者:
陈庆军12 蔡健12 吴轶3 杨春12 梁剑4
1 华南理工大学土木与交通学院, 广州 510641; 2 华南理工大学亚热带建筑科学国家重点试验室,广州 510641; 3 广州大学土木工程学院,广州 510000; 4 华南理工大学建筑学院,广州 510641
Author(s):
Chen Qingjun12 Cai Jian12 Wu Yi3 Yang Chun12 Liang Jian4
1 School of Civil and Transportation Engineering, South China University of Technology, Guangzhou 510641, China
2 State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641, China
关键词:
局部受压 约束混凝土 试验研究
Keywords:
local compression confined concrete experimental study
分类号:
TU398
DOI:
10.3969/j.issn.1001-0505.2010.01.031
摘要:
针对27个配置了双重环筋的圆柱形构件进行了局部受压试验,试件高度低于试件直径.研究了非局压区宽度b、试件高度h和约束钢筋配筋率ρ对试件的破坏形态极限承载力等效应力-应变曲线开裂荷载正常使用状态下的荷载及内外环筋屈服荷载的影响.在环筋的约束下,试件局压区核心混凝土体出现较高的强度和较好的延性.试件发生了三类破坏形态:侧面只有竖向裂缝竖向裂缝加不全贯通环向裂缝和竖向裂缝加全贯通环向裂缝.高度系数β对于试件承载力的影响是最大的,随着β的减小,承载力呈非线性增大趋势.随配筋率增大,承载力增大,其增大量有变缓的趋势.宽度系数对试件承载力有一定影响,但不太明显.
Abstract:
Local compression experiments on 27 cylinder specimens strengthened by double layer ring steel bars were carried out. The height of the specimens is lower than the diameter of the specimens. The experimental parameters include the non-local compression width b, the height of the specimens h, and the steel ratio ρ. The failure modes, ultimate capacity, equivalent stress-strain curves, corresponding load of crack and normal service status, and the yield load of the inner and outer steel ring bars were studied. Under the confinement of the ring bars, the concrete in the local compression zone shows higher strength and well ductility. Three failure modes may occur at the side faces, namely, vertical cracks, vertical cracks with non-through horizontal cracks, as well as vertical crack with through horizontal crack. The height factor β is the main influencing factor of the bearing capacity, its influence is nonlinear, and the bearing capacity increases more quickly with the decrease of β. The bearing capacity increases with the increasing of ρ, but the increment slows down when ρ increases. The width factor α has some effect on the bearing capacity, but its influence is not so obvious.

参考文献/References:

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备注/Memo

备注/Memo:
作者简介: 陈庆军(1975—),男,博士,讲师,qjchen@scut.edu.cn.
基金项目: 国家自然科学基金资助项目(50878087)、广东省自然科学基金资助项目(9451064101002910)、广州市教育局科技资助项目(62063).
引文格式: 陈庆军,蔡健,吴轶,等.双重环筋约束下超短混凝土试件的局部受压试验研究[J].东南大学学报:自然科学版,2010,40(1):165-170. [doi:10.3969/j.issn.1001-0505.2010.01.031]
更新日期/Last Update: 2010-01-20