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

卷:

37卷

期数:

2020年06期

页码:

38-45

栏目:

出版日期:

2020-11-30

文章信息/Info

Title:

Flexural Behaviors Test and Capacity Analysis of Ultra High Strength Rebar Reinforced Engineered Cementitious Composites Beams

文章编号:

1673-2049(2020)06-0038-08

作者:

章一萍¹,李碧雄²,廖 桥³,周 练¹,唐丽娜¹

1. 四川省建筑设计研究院有限公司,四川 成都 610000; 2. 四川大学 深地科学与工程教育部重点实验室, 四川 成都 610065; 3. 同济大学 土木工程学院,上海 200092

Author(s):

ZHANG Yi-ping¹, LI Bi-xiong², LIAO Qiao³, ZHOU Lian¹, TANG Li-na¹

1. Sichuan Provincial Architectural Design and Research Institute Co., Ltd, Chengdu 610000, Sichuan, China; 2. Key Laboratory of Deep Earth Science and Engineering, Ministry Education, Sichuan University, Chengdu 610065, Sichuan, China; 3. College of Civil Engineering, Tongji University, Shanghai 200092, China

关键词:

工程用水泥基复合材料;  超高强钢筋;  受弯性能;  承载力;  配筋率

Keywords:

engineered cementitious composite;  ultra high strength rebar;  flexural behavior;  bearing capacity;  reinforcement ratio

分类号:

TU375.1

DOI:

-

文献标志码:

A

摘要:

为进一步研究工程用水泥基复合材料(ECC)与超高强钢筋组合成的超高强钢筋ECC梁(UHSRRE梁)的受弯性能,对3根UHSRRE梁、1根普通强度钢筋增强ECC梁(RECC梁)和1根普通强度钢筋增强混凝土梁(RC梁)进行弯曲试验,分析弯曲试验现象、ECC应变、延性性能和特征弯矩,并研究纵筋配筋率对UHSRRE梁承载力的影响。结果表明:UHSRRE梁和RECC梁的控裂能力比RC梁的控裂能力强; 与RECC梁相比,UHSRRE梁并未因采用超高强钢筋而使其控裂能力明显下降; UHSRRE梁截面应变基本符合平均应变的平截面假定,梁受拉区边缘的ECC应变小于ECC单轴受拉极限应变,梁受拉区的ECC始终不退出工作; UHSRRE梁受拉区和受压区边缘ECC应变的最大值、受压区高度和特征弯矩(除开裂弯矩)都随纵筋配筋率增加而变大; 随纵筋配筋率增加,UHSRRE梁的能量延性系数先增后减; 当UHSRRE梁具有适当纵筋配筋率时,其延性性能可优于RECC梁的延性性能。

Abstract:

In order to further study the flexural behaviors of ultra high strength rebar reinforced engineered cementitious composites(UHSRRE)beams which consist of engineered cementitious composites(ECC)and ultra high strength rebar, three UHSRRE beams, one reinforced engineered cementitious composites(RECC)beam and one reinforced concrete(RC)beam were tested, respectively. The experimental phenomena, ECC strains, ductility and characteristic moment of these beams were carefully analyzed. The results show that UHSRRE beams and RECC beams have a strong crack control ability compared with RC beams. In comparison with RECC beams, UHSRRE beams containing ultra high strength reinforcement have no obvious decrease in crack control ability. The cross-section strains of UHSRRE beams basically conform to the plane section assumption of mean strain, and ECC in the tension zone of UHSRRE beams is effective after cracking. With the increase of longitudinal reinforcement ratio, the ECC strains at the edge of compressive zone, maximum tensile strain of ECC at the edge of tensile zone, height of compressive zone and characteristic moment(except for cracking moment)of UHSRRE beams enlarge, but energy ductility coefficient increases first and then decreases. The ductility of UHSRRE beams is better than that of RECC beams when the reinforcement ratio is appropriate.

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备注/Memo

备注/Memo:

收稿日期:2019-11-05 基金项目:国家重点研发计划项目(2018YFC1508802); 国家自然科学基金项目(51678379) 作者简介:章一萍(1961-),女,四川乐山人,教授级高级工程师,E-mail:1641694650@qq.com。 通信作者:廖 桥(1992-),男,四川德阳人,工学博士研究生,E-mail:liaoqiaosc@hotmail.com。

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