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首页> 外文会议>6th International conference on advanced composite materials in bridges and structures 2012 >REPAIRING OF REINFORCED CONCRETE BEAMS IN TORSION USING UHP-SHCC MATERIAL
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REPAIRING OF REINFORCED CONCRETE BEAMS IN TORSION USING UHP-SHCC MATERIAL

机译：使用UHP-SHCC材料修复扭转的钢筋混凝土梁

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摘要

Ultra high performance-strain hardening cementitious composites (UHP-SHCC) are a composite material comprising a cement-based matrix and short polypropylene fibers with outstanding mechanical and protective performance against some natural attack like sea water effect. Jacketing with composites on the outer periphery is an effective way to enhance the torsional capacity of distressed reinforced concrete torsional members, changing the mode of failure from brittle to ductile. This study presents the torsional behaviour of reinforced concrete beams repaired with UHP-SHCC material. Four repaired beams and a control beam were tested to study the effects on the cracking load of using an unreinforced and steel reinforced UHP-SHCC layer. The control and the repaired beams were subjected to a pure torsional moment. The failure load, the twist angle of the beams, and the strains in the longitudinal and transverse reinforcement were recorded to failure. In the current study, the ductility ratios and the percentage increase in ductility were investigated. Experimental results revealed that the repairing techniques and materials could significantly increase the torsional capacity of the pre-cracked beams in torsion. It could also enhance the post cracking behaviour of the repaired beams.
机译：超高性能应变硬化水泥基复合材料（UHP-SHCC）是一种复合材料，包括水泥基基质和短聚丙烯纤维，具有出色的机械和防护性能，可抵抗某些自然侵蚀，例如海水作用。在外圆周上用复合材料进行护套是增强受困钢筋混凝土扭转构件扭转能力的有效方法，将破坏方式从脆性变为延性。本研究介绍了用UHP-SHCC材料修复的钢筋混凝土梁的扭转性能。测试了四个修复梁和一个控制梁，以研究使用未增强和钢增强的UHP-SHCC层对开裂荷载的影响。对照梁和修复后的梁承受纯扭力。记录破坏载荷，梁的扭转角以及纵向和横向钢筋的应变。在当前的研究中，研究了延展性比率和延展性增加百分比。实验结果表明，修复技术和材料可以显着提高预裂梁的扭转承载力。它还可以增强修复后梁的后开裂行为。

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