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

卷:

28卷

期数:

2011年01期

页码:

53-57

栏目:

出版日期:

2011-03-20

文章信息/Info

Title:

Experiment on Crack of Thick-cover Reinforced Concrete Beams

作者:

李志华¹,苏小卒²,赵勇²

1. 扬州大学 建筑科学与工程学院,江苏 扬州 225127; 2. 同济大学 土木工程学院,上海 200092

Author(s):

LI Zhi-hua¹, SU Xiao-zu², ZHAO Yong²

1. School of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China; 2. School of Civil Engineering, Tongji University, Shanghai 200092, China

关键词:

钢筋混凝土梁;  大保护层;  裂缝宽度;  静载试验;  裂缝间距

Keywords:

reinforced concrete beam;  thick-cover;  crack width;  static-loading experiment;  crack spacing

分类号:

TU375.1

DOI:

-

文献标志码:

A

摘要:

采用两点对称集中的同步分级加载方式,对4根配置500 MPa钢筋的大保护层混凝土梁进行了静载试验,观测试件的裂缝发展过程,了解此类构件的裂缝特点; 同时,结合另外24根大保护层混凝土梁的试验数据,建议了此类构件的裂缝间距及裂缝宽度的计算公式,并根据配置表层钢筋或箍筋的混凝土梁试验结果,对大保护层混凝土梁提出了裂缝宽度控制建议。分析结果表明:配置500 MPa钢筋的大保护层混凝土梁裂缝发展规律与普通钢筋混凝土梁基本相同,但在正常使用状态下,混凝土构件的裂缝宽度较大,难以满足规范要求; 按照中国现行《混凝土结构设计规范》(GB 50010—2002)对大保护层混凝土梁进行裂缝宽度验算得到的计算值普遍大于实测值。

Abstract:

4 thick-cover concrete beams reinforced with 500 MPa steel bars were tested under two-point symmetrical concentrated static-loading to observe the details of crack development on these beams and investigate their cracking characteristics, meanwhile, combining the existing test data of 24 thick-cover reinforced concrete beams, the revised calculation formulas for crack spacing and crack width were suggested. Furthermore, based on the test results of the concrete beams with skin reinforcements or stirrups, the design recommendations were proposed for crack control of reinforced concrete beams with thick concrete cover. Analysis results show that the cracking behavior of the thick-cover concrete beams reinforced with 500 MPa steel bars is similar to that of the common reinforced concrete flexural members, but under the state of serviceability, the crack widths of these beams are usually larger and can't meet the demands of code. The calculated crack widths of thick-cover concrete beams using the formulas adopted in current Chinese Code for Design of Concrete Structures(GB 50010—2002)usually exceed the experiment crack widths.

参考文献/References:

[1] GB 50010—2002,混凝土结构设计规范[S]. GB 50010—2002,Code for Design of Concrete Structures[S].
[2]SL/T 191—96,水工混凝土结构设计规范[S]. SL/T 191—96,Design Code for Hydraulic Concrete Structures[S].
[3]王清湘,赵顺波.大保护层钢筋混凝土受弯构件裂缝控制的试验研究[J].大连理工大学学报,1993,33(5):566-575. WANG Qing-xiang,ZHAO Shun-bo.Research on Crack Control of RC Beams with Large Concrete Cover[J].Journal of Dalian University of Technology,1993,33(5):566-575.
[4]童保全.大保护层钢筋混凝土受弯构件裂缝开展的试验研究[J].水运工程,1985(6):52-55. TONG Bao-quan.Research on Cracking Behavior of RC Beams with Large Concrete Cover[J].Port & Waterway Engineering,1985(6):52-55.
[5]HOGNESTAD E.High Strength Bars as Concrete Reinforcement,Part 2:Control of Flexural Cracking[J].Journal of the PCA Research and Development Laboratories,1962,4(1):46-63.
[6]KAAR P H,MATTOCK A H.High Strength Bars as Concrete Reinforcement,Part 4:Control of Cracking[J].Journal of the PCA Research and Development Laboratories,1963,5(1):15-38.
[7]CCES 01—2004,混凝土结构耐久性设计与施工指南[S]. CCES 01—2004,Guide to Durability Design and Construction of Concrete Structures[S].
[8]CLARK A P.Cracking in Reinforced Concrete Flexural Members[J].Journal of American Concrete Institute,1956,52(8):851-862.
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[10]顾祥林.混凝土结构基本原理[M].上海:同济大学出版社,2004. GU Xiang-lin.Basic Principles of Reinforced Concrete Structures[M].Shanghai:Tongji University Press,2004.
[11]丁大钧.钢筋混凝土构件抗裂度、裂缝和刚度[M].南京:南京工学院出版社,1986. Ding Da-jun.Resistance Cracking Moment,Crack and Stiffing Effect in Reinforced Concrete Members[M].Nanjing:Nanjing Institute of Technology Press,1986.
[12]苏小卒,李志华,赵 勇,等.配筋表层钢筋的混凝土梁裂缝和刚度试验探讨研究[J].建筑结构学报,2009,30(1):62-67. SU Xiao-zu,LI Zhi-hua,ZHAO Yong,et al.Experimental Research on Crack Width and Stiffness of Reinforced Concrete Beams with Skin Reinforcement[J].Journal of Building Structures,2009,30(1):62-67.
[13]EN 1992-1-1:2002,Eurocode 2:Design for Concrete Structures.Part 1-1:General Rules and Rules for Buildings[S].
[14]MAKHLOUF H M,MALHAS F A.The Effect of Thick Concrete Cover on the Maximum Flexural Crack Width Under Service Load[J].ACI Structural Journal,1996,93(3):257-265.

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备注/Memo

备注/Memo:

收稿日期:2010-11-06
基金项目:国家高技术研究发展计划(“八六三”计划)项目(2004AA33G050)
作者简介:李志华(1982-),女,山东金乡人,讲师,工学博士,E-mail:lizhihua-1982@tom.com。

常用功能

更新日期/Last Update: 2011-03-20