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高強(qiáng)鋼筋混凝土偏壓與受彎構(gòu)件裂縫寬度對(duì)比試驗(yàn)研究

張偉1，耿樹江1， 朱建國(guó)1， 江 濤1，王命平2(1 中冶建筑研究總院有限公司，北京 100088； 2 青島理工大學(xué)，青島 266033)

［摘要］ 通過對(duì)9根500MPa級(jí)細(xì)晶粒鋼筋混凝土偏壓柱及1根HRB400鋼筋混凝土偏壓柱進(jìn)行的試驗(yàn)，觀測(cè)試件的裂縫寬度，并與受彎構(gòu)件試驗(yàn)裂縫情況進(jìn)行對(duì)比。對(duì)試驗(yàn)結(jié)果的分析表明：500MPa級(jí)細(xì)晶粒鋼筋用于鋼筋混凝土偏壓構(gòu)件，在正常使用階段裂縫寬度能夠滿足要求；由于壓力N的作用，構(gòu)件在偏心受壓狀態(tài)下裂縫間縱向受拉鋼筋應(yīng)變不均勻系數(shù)ψ值比受彎狀態(tài)下的要小，致使偏壓構(gòu)件的裂縫寬度小于受彎構(gòu)件的；建議取偏心受壓狀態(tài)下的構(gòu)件受力特征系數(shù)αcr=1.9，利用建議公式進(jìn)行計(jì)算的結(jié)果表明，偏壓構(gòu)件與受彎構(gòu)件裂縫寬度計(jì)算結(jié)果具有相同的可靠度。

［關(guān)鍵詞］500MPa級(jí)細(xì)晶粒鋼筋；偏壓構(gòu)件；受彎構(gòu)件；裂縫寬度

中圖分類號(hào)：TU375.3文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2011)01-0087-04

Crack width contrast tests of eccentric compression components with high-strength

reinforced concrete and bending components

Zhang Wei1, Geng Shujiang1, Zhu Jianguo1, Jiang Tao1, Wang Mingping2

(1 Central Research Institute of Building and Construction of MCC Group Corporation, Beijing 100088, China；

2 Qingdao Technological University, Qingdao 266033, China)

Abstract:Based on the experiments of nine eccentric compression columns with 500MPa fine grain bars and one with HRB400 bars, the developments of crack width for the eccentric compression components were observed and compared with the experimental cracks of the bending components. The analysis of the experimental results shows that the crack width of eccentric compression components with 500MPa fine grained bars can meet the requirements in normal use stage. Due to the role of pressure N, ψ value of the components in the state of eccentric compression is smaller than that of in the state of bending, which will cause the crack width of eccentric compression components smaller than that of bending components. 1.9 is advised to be the force characteristics coefficient  αcr of eccentric compression components.The result of crack width calculated by the advised formula for eccentric compression components and bending components shows that they have the same reliability level.

Keywords:500MPa fine grain bar; eccentric compression component; bending component; crack width

*國(guó)家863計(jì)劃資助項(xiàng)目(2007AA03Z550)。

作者簡(jiǎn)介：張偉，碩士，助理工程師，Email：duanmupiaoxiang@163.com。

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