| 管俊峰，赵顺波，黄承逵.钢筋混凝土梁裂缝分布受保护层厚度影响试验研究[J].,2010,(5):723-728 |
| 钢筋混凝土梁裂缝分布受保护层厚度影响试验研究 |
| Experimental study of crack distribution of reinforced concrete beams influenced by thickness of concrete cover |
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| DOI：10.7511/dllgxb201005018 |
| 中文关键词: 钢筋混凝土 梁 混凝土保护层厚度 裂缝分布 裂缝宽度比 |
| 英文关键词: reinforced concrete beams thickness of concrete cover crack distribution ratio of crack width |
| 基金项目:河南省杰出青年科学基金资助项目(04120002300)；河南省高校创新人才培养工程培养对象基金资助项目(豫教高［2004］294号) |
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| 中文摘要: |
| 通过12根保护层厚度不同的钢筋混凝土梁试验，量测了正常使用各级荷载下受拉区内不同高度梁侧面处的裂缝间距与裂缝宽度．分析了混凝土保护层厚度变化对平均裂缝间距和平均裂缝宽度的影响规律，结果表明：底面至侧面1.5as范围内，平均裂缝间距和平均裂缝宽度随保护层厚度c的增加而增加．确定了裂缝宽度最大值的出现位置：c=60～70 mm时在梁底面；c=40～50 mm时在梁底面，但梁腹处裂缝也有一定宽度；c=20～30 mm时在梁腹．研究了保护层厚度不同的钢筋混凝土梁受拉区范围内不同高度处与钢筋重心水平对应的混凝土侧表面裂缝宽度之间的比值关系，通过理论分析与试验数据拟合，提出了该比值的计算方法,比较结果表明计算值与实测值吻合较好． |
| 英文摘要: |
| Based on the tests of 12 reinforced concrete (RC) beams with different concrete covers, the crack spacing and crack width at various heights in the tensile region were measured under several loadings of serviceability state. The effects of concrete cover variation on average crack spacing and average crack width at different heights were analyzed, and the results show that in the range of the bottom surface to 1.5as, the average crack spacing and the average crack width increase with the thickness of concrete cover c increasing. The positions of maximum crack width were given: occurring at the bottom surface for RC beams with c=60-70 mm; with c=40-50 mm also occurring at the bottom surface, but at the web of beam it is wider; occurring at the web with c=20-30 mm.The relationships of crack widths at any position in the tensile zone and at the reinforcement level on the side surface of beam were studied, and by theoretical and statistical analyses, a method is proposed to calculate the ratios of crack widths between any position and the reinforcement level on the side surface of reinforced concrete beams with different thickness of concrete cover. The results of comparisons show that the proposed formulas agree well with the test data. |
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