高强钢筋混凝土偏压与受弯构件裂缝宽度对比试验研究

张伟1，耿树江1， 朱建国1， 江 涛1，王命平2(1 中冶建筑研究总院有限公司，北京 100088； 2 青岛理工大学，青岛 266033)

［摘要］ 通过对9根500MPa级细晶粒钢筋混凝土偏压柱及1根HRB400钢筋混凝土偏压柱进行的试验，观测试件的裂缝宽度，并与受弯构件试验裂缝情况进行对比。对试验结果的分析表明：500MPa级细晶粒钢筋用于钢筋混凝土偏压构件，在正常使用阶段裂缝宽度能够满足要求；由于压力N的作用，构件在偏心受压状态下裂缝间纵向受拉钢筋应变不均匀系数ψ值比受弯状态下的要小，致使偏压构件的裂缝宽度小于受弯构件的；建议取偏心受压状态下的构件受力特征系数αcr=1.9，利用建议公式进行计算的结果表明，偏压构件与受弯构件裂缝宽度计算结果具有相同的可靠度。

［关键词］500MPa级细晶粒钢筋；偏压构件；受弯构件；裂缝宽度

中图分类号：TU375.3文献标识码：A文章编号：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

*国家863计划资助项目(2007AA03Z550)。

作者简介：张伟，硕士，助理工程师，Email：duanmupiaoxiang@163.com。

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