<strong>C80</strong>早龄期钢筋混凝土梁受弯性能试验研究

王冬雁; 吴岳刚; 杨振坤; 王梦梦; 袁泉; 廖娟; 韦永斌

doi:10.13204/j.gyjz201312015

C80早龄期钢筋混凝土梁受弯性能试验研究

doi: 10.13204/j.gyjz201312015

1.
1. 中国建筑股份有限公司技术中心,北京 101300;
2.
2. 北京交通大学土木建筑工程学院,北京 100044

基金项目:

中建科技资助项目(CSCEC-2012-Z-02);十一五科技支撑项目(2006BAJ0104)

详细信息

作者简介:
王冬雁，女，1972年出生，博士，高级工程师。电子信箱:wangdongyan@cscec.com

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- 被引次数: 0
出版历程
- 收稿日期: 2013-06-25
- 刊出日期: 2013-12-20

EXPERIMENTAL STUDY ON BENDING BEHAVIOR OF C80 CONCRETE BEAMS AT EARLY AGE

1.
1. China State Construction Engrg. Corp. Ltd. Technical Center,Beijing 101300,China;
2.
2. School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China

摘要

摘要: 通过1,3,7,28,90 d不同龄期下8根C80高强钢筋混凝土梁(RCL)试件受弯性能试验,研究钢筋混凝土梁在各种龄期下的破坏形态,量测和记录不同龄期下梁的挠度、应变、裂缝发展情况,并通过对1,3,7 d龄期梁试件早期受力(同龄期下梁破坏荷载的50%),卸荷后自然养护28 d进行抗弯性能试验,分析梁试件早期受力对后期强度及其他性能的影响,重点探究早龄期梁试件的抗弯能力和延性性能。试验结果表明:试件的开裂荷载、屈服荷载和极限荷载在早龄期(3 d前)阶段受龄期影响较大,之后影响变小,7 d后影响幅度在3%左右,1 d龄期的钢筋混凝土梁其极限弯矩可达自然养护条件下28 d龄期梁极限弯矩的90%;各种龄期下梁截面应变基本符合平截面假定;梁早期承受50%极限荷载对后期承载能力影响较小,对变形能力影响较大。
- C80高强钢筋混凝土梁 /
- 早期受荷 /
- 试验研究 /
- 受弯性能
Abstract: Through bending experiments the paper tested the flexural behaviors of 8 C80 high strength reinforced concrete beams，whose failure modes were studied; and deflections，strains and cracks development were also measured and recorded at 1，3，7，28，90 d. In order to study the influence of the early load (50% of ultimate compressive strength) on the long-term performance of beams，it was also carried out the tests in which beams were loaded to a level about 50% of ultimate compressive strength and then unloaded at the age of 1, 3, 7 d. After that the specimens were cured under natural conditions for 28 d and then were tested again. The two tests'results show that the cracking load，yield load and ultimate load of specimens in the concrete early age(3 d ago) were influenced by ages greatly and were affected little after 3 d，the degree was about 3% after 7 d. The ultimate moment of C80 reinforced concrete beams of 1 d age can reach the 90% of that of 28 d. The cross-section strains at various concrete ages were agreed with those of plane section assumption. The beam carried 50% ultimate load at concrete early age which has smaller influence on deformation capacity and greater one on carrying capacity.
- C80 high strength reinforcement concrete beam /
- early loading /
- experimental study /
- bending behavior

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参考文献(11)

[2] Gardner N J.Effect of Temperature on the Early-Age Properties ofType I,Type III,and Type I/Fly Ash Concretes［J].ACIMaterials Journal, 1990, 87(1): 68-78.

Lew H S,Reichard T W.Mechanical Properties of Concrete atEarly Ages[J].Journal of the American Concrete Institute, 1978,75(10): 533-542.

[3] Kovler K.Testing System for Determining the Mechanical Behaviourof Early Age Concrete Under Restrained and Free UniaxialShrinkage[J].Materials and Structures, 1994, 27(7):324-339.

[4] 金贤玉, 沈毅, 李宗津, 等.混凝土早龄期受力对后期性能的影响[J].混凝土, 2003(7):35-37.

[5] 金南国, 金贤玉, 郑砚国, 等.早龄期混凝土断裂性能和微观结构的试验研究[J].浙江大学学报, 2005, 39(9):1374-1377.

[6] 张勇强, 林皋, 阎东明.混凝土早期强度的试验研究［J].沈阳建筑工程学院学报:自然科学版, 2003, 19(2):85-89.

[7] 沈毅.早龄期混凝土若干性能的研究［D].杭州:浙江大学建筑工程学院, 2004.

[8] Lew H S,Reichard T W.Mechanical Properties of Concrete atEarly Ages[J].ACI Journal Proceedings, 1978: 533-542.

[9] Donald Smith M.Early-Time Strength and Elastic Modules ofConcrete with High Proportions of Fly Ash[J].USAE WaterwaysExperiment, 2001(1):13-17.

[10] Jin-Keum Kima, Sang Hua Hanh, Young Chual Songc.Effect ofTemperature and Aging on the Mechanical Properties of ConcretePart Ⅰ.Experimental Results ［J].Cement and ConcreteResearch, 2002, 32(7):1087-1094.

[11] Jin-Keum Kima, Sang Hua Hanh, Young Chual Songc.Effect ofTemperature and Aging on the Mechanical Properties of ConcretePart Ⅱ［J].Cement and Concrete Research, 2002(32):1095-1100.

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