采用ECC改善钢筋混凝土深梁抗剪性能的试验研究

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发布时间：2020-01-06 00:00:00

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采用ECC改善钢筋混凝土深梁抗剪性能的试验研究

Experimental Study on the Improving Shear Resistance of Reinforced Concrete Deep Beams with ECC

２０19年第10期

深梁；名义抗剪强度；挠度；裂缝；延性

Deep beam; Nominal ultimate shear strength; Deflection; Crack; Ductility

２０19年第10期

10.19761/j.1000-4637.2019.10.053.06

南京工程学院校级科研基金项目（YKJ201724）；江苏省高校自然科学研究面上项目（17KJB560006）。

胡世翔1，罗敏2,3

1.南京工程学院，211167；2.南京航空航天大学金城学院，211156；3.东南大学土木工程学院，南京210096

胡世翔1，罗敏2,3

胡世翔,罗敏.采用ECC改善钢筋混凝土深梁抗剪性能的试验研究[J].混凝土与水泥制品,2019(10):53-57+73.

HU S X,LUO M.Experimental Study on the Improving Shear Resistance of Reinforced Concrete Deep Beams with ECC[J].China Concrete and Cement Products,2019(10):53-57+73.

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摘要：采用国产纤维制成的高性能水泥基复合材料（ECC）替代混凝土形成钢筋增强ECC深梁，并与3根普通钢筋混凝土深梁进行了集中荷载下抗剪性能对比试验研究。研究表明，RC深梁主要是剪切破坏和局压破坏，采用ECC后，RE1、RE3深梁的破坏模式从脆性破坏转为延性弯压破坏，RE深梁出现多条细密裂缝，且无碎屑剥落，整体性良好。相同配筋情况下，RE深梁的名义抗剪强度平均是RC深梁的1.25倍，延性系数平均是RC深梁的2.81倍。就名义极限剪切强度和裂缝宽度而言，ECC的使用至少可以替代RC深梁中0.3%的分布筋。 Abstract: For the sake of improving the shear performance of reinforced concrete beams, an engineered cementitious composite (ECC) is introduced to substitute concrete in deep beams. A comparative experimental study on shear behaviors of three reinforced concrete (RC) deep beams and three reinforced ECC (RE) deep beams are carried out. The results show that RE deep beams present a ductile failure with the appearance of many fine diagonal cracks. The failure model of RC deep beams are mainly shear failure and local failure. The usage of ECC can turn brittle failure mode into ductility bending-compression failure mode. With the same reinforcement ratio, the nominal ultimate shear strength and the shear ductility index of RE deep beams are about 1.25 times and 2.81 times those of RC deep beams, respectively. Comparing to RC deep beams, ECC can substitute for the 0.3% distributing bars in the aspect of nominal ultimate shear strength and the width of cracks.

英文名 : Experimental Study on the Improving Shear Resistance of Reinforced Concrete Deep Beams with ECC

刊期 : ２０19年第10期

关键词 : 深梁；名义抗剪强度；挠度；裂缝；延性

Key words : Deep beam; Nominal ultimate shear strength; Deflection; Crack; Ductility

刊期 : ２０19年第10期

DOI : 10.19761/j.1000-4637.2019.10.053.06

文章编号 :

基金项目 : 南京工程学院校级科研基金项目（YKJ201724）；江苏省高校自然科学研究面上项目（17KJB560006）。

作者 : 胡世翔1，罗敏2,3

单位 : 1.南京工程学院，211167；2.南京航空航天大学金城学院，211156；3.东南大学土木工程学院，南京210096

胡世翔1，罗敏2,3

胡世翔,罗敏.采用ECC改善钢筋混凝土深梁抗剪性能的试验研究[J].混凝土与水泥制品,2019(10):53-57+73.

HU S X,LUO M.Experimental Study on the Improving Shear Resistance of Reinforced Concrete Deep Beams with ECC[J].China Concrete and Cement Products,2019(10):53-57+73.

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摘要

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参考文献

引用本文

摘要：采用国产纤维制成的高性能水泥基复合材料（ECC）替代混凝土形成钢筋增强ECC深梁，并与3根普通钢筋混凝土深梁进行了集中荷载下抗剪性能对比试验研究。研究表明，RC深梁主要是剪切破坏和局压破坏，采用ECC后，RE1、RE3深梁的破坏模式从脆性破坏转为延性弯压破坏，RE深梁出现多条细密裂缝，且无碎屑剥落，整体性良好。相同配筋情况下，RE深梁的名义抗剪强度平均是RC深梁的1.25倍，延性系数平均是RC深梁的2.81倍。就名义极限剪切强度和裂缝宽度而言，ECC的使用至少可以替代RC深梁中0.3%的分布筋。
Abstract: For the sake of improving the shear performance of reinforced concrete beams, an engineered cementitious composite (ECC) is introduced to substitute concrete in deep beams. A comparative experimental study on shear behaviors of three reinforced concrete (RC) deep beams and three reinforced ECC (RE) deep beams are carried out. The results show that RE deep beams present a ductile failure with the appearance of many fine diagonal cracks. The failure model of RC deep beams are mainly shear failure and local failure. The usage of ECC can turn brittle failure mode into ductility bending-compression failure mode. With the same reinforcement ratio, the nominal ultimate shear strength and the shear ductility index of RE deep beams are about 1.25 times and 2.81 times those of RC deep beams, respectively. Comparing to RC deep beams, ECC can substitute for the 0.3% distributing bars in the aspect of nominal ultimate shear strength and the width of cracks.

关键词:

深梁；名义抗剪强度；挠度；裂缝；延性

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采用ECC改善钢筋混凝土深梁抗剪性能的试验研究

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