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EXPERIMENTAL RESEARCH ON CRACK WIDTH OF HRB500 STEEL BARS RC BEAMS
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摘要: 对15根配置HRB500级钢筋的混凝土梁进行裂缝宽度试验,研究试验梁中裂缝特性,分析GB500102002《混凝土结构设计规范》的裂缝宽度计算方法。分析结果表明:对于配置HRB500级钢筋的混凝土梁,钢筋应变sm-s平行性关系仍然成立;截面内力臂系数取0.87,与试验结果符合良好;裂缝间距及裂缝宽度试验值较规范公式计算值小,调整钢筋粘结特征系数为1.2,可提高规范公式计算精度;规范的裂缝计算模式能够反映实际裂缝规律,但最大裂缝宽度计算结果偏于保守。Abstract: Experiment was carried out on crack width of 15 concrete beams reinforced with HRB500 steel bars. Crack properties of specimens were studied; and the calculating method of crack width in GB 500102002Code for Design of Concrete Structureswas analyzed. The results indicate that the parallel relationship of sm-s is true for HRB500 steel bars. It is proper to take 0. 87 for coefficient of internal force arm. Test results of crack spacing and crack width is smaller than that calculated by the formula from GB 500102002. Adjusting bond coefficient of HRB500 steel bars to 1. 2 can improve the accuracy of the formula. Crack calculating mode of GB 500102002 is practical while the calculated maximum crack width is conservative.
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Key words:
- HRB500 steel bar /
- concrete beams /
- crack spacing /
- crack width /
- experimental study
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李春秋,陈肇元.荷载作用下混凝土构件裂缝控制的若干问题[J].建筑结构,2007,37(1):114-119. [2] 南京工学院第五系.钢筋混凝土受弯构件变形和裂缝的计算[G]∥钢筋混凝土结构研究报告选集.北京:中国建筑工业出版社,1977:237-289. [3] 梁书亭,蒋永生,姜宁辉.高强钢筋高强混凝土梁裂缝宽度验算方法的研究[J].南京建筑工程学院学报,1998(2):10-15. [4] 尚世仲.配高强钢筋混凝土梁的受弯性能试验研究[D].上海:同济大学,2007. [5] 王命平,张自琼,耿树江.500MPa 级带肋碳素钢筋混凝土简支梁的受弯试验[J].工业建筑,2007,37(8):39-42. [6] 变形裂缝专题研究组.钢筋混凝土构件裂缝宽度计算[R]//钢筋混凝土结构设计与构造.北京:中国建筑科学研究院,1985:183-195. [7] ACI Committee 224 Control of Cracking in Concrete Structures(ACI 224R-01)[S]. -
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