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EXPERIMENTAL STUDY ON SHEAR BEHAVIOR OF BEAM WITH C1 00 CONCRETE AND HRBF500 GRADE REBAR
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摘要: 通过对4根配箍率不同,剪跨比为3的高强钢筋C100混凝土梁的抗剪试验,观测梁的破坏过程及裂缝发展形态;并根据试验结果数据分析其抗剪承载力;最后将试验值与采用GB 50012010《混凝土结构设计规范》公式计算的计算值进行了对比。结果表明,高强钢筋C100混凝土梁抗剪承载力稳定,破坏形态与普通混凝土梁相似;适量提高配箍率,可以有效地控制斜裂缝的开展,提高梁的抗剪承载力;对于剪跨比为3的高强钢筋C100混凝土梁来说,GB 50012010《混凝土结构设计规范》公式用于无腹筋梁抗剪计算是偏高的,而用于有腹筋梁抗剪设计是偏保守的。Abstract: Four beams with C1 00 high-strength concrete and HRBF 500 grade rebar and different stirrup ratio weretested, with the shear-span ratio being kept around 3. The development form of the crack and failure process of beamswere observed. According to the data of the test, the shear capacity of beams was analyzed. At last, the experimentalresults were compared with the calculation values by current code. The testing results indicate that the beams with C1 00 high-strength concrete and HRBF 500 grade rebar could work well and its failure modes were similar to theordinary concrete beam. Improving stirrup ratio appropriately was an effective way to improve the shear bearingcapacity and control the diagonal crack development of beams. When shear-span ratio is 3, the current Chinese codeformula used for beam without web reinforcement is not safe, and used for beam with web reinforcement isconservative.
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Key words:
- HRBF 500 grade rebar /
- high-strength concrete /
- stirrup ratio /
- static test /
- shear bearing capacity
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[2] GB5015292混凝土结构试验方法[S]. GB500102010混凝土结构设计规范[S]. [3] 史庆轩,侯炜,姜维山,等.高强箍筋高强混凝土梁受剪承载力研究[J].建筑结构学报,2009(S2):98-103. [4] 易伟建,吕艳梅.高强箍筋高强混凝土梁受剪试验研究[J].建筑结构学报,2009,30(4):94-101. [5] 支运芳,蒋超,甘民,等.纵筋率对有腹筋约束梁受剪性能影响的研究[J].重庆建筑大学学报,2005,27(4):64-69. [6] 孙永成.HRB500钢筋混凝土梁受剪承载力的有限元分析[D].天津:河北工业大学,2008. [7] 李立仁,支运芳,陈永庆,等.集中荷载下超高强混凝土有腹筋约束梁抗剪强度的试验研究[J].建筑结构学报,2001,22(5):32-36. -
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