混杂纤维增强钢筋自密实混凝土梁抗剪试验研究  

Experimental Investigation on the Shear of Resistance Hybrid Fiber Self-Consolidating Reinforced Concrete Beams

作　　者：达布希拉图[1] 丁一宁[1] 尤志国[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《建筑科学》2010年第3期6-10,27,共6页Building Science

基　　金：国家自然科学基金项目(50578026)

摘　　要：通过对一系列以纤维类型、纤维掺量、配箍率为主要变化参数的混杂纤维自密实混凝土梁斜截面抗剪试验分析,本文研究了在两个对称的集中荷载作用下无箍筋纤维混凝土梁和有箍筋纤维混凝土梁的极限剪力、剪力—加载点位移曲线特性以及破坏形态。结果表明,适量的纤维,尤其是混杂纤维能够显著提高自密实混凝土梁的极限剪力、峰值后承载能力以及韧性,不同纤维共同抗剪时具有明显的正混杂效应。混杂纤维和箍筋的共同作用使按构造配置箍筋的混凝土梁从脆性的剪切破坏转为延性的弯曲破坏。This paper studied the shear behavior of 10 self-consolidating concrete rectangular simply supported beams,which were made of hooked steel fibers and plastic fibers reinforced concrete with and without stirrups,subjected to two-point symmetrically placed vertical loads.The major variables are the fiber types and fiber content as well as stirrup ratios.Experimental results show that the shear behavior of hybrid fiber reinforced concrete beams is similar to,or even better than that of beams with steel fibers.In particular,the results show that the addition of hybrid fibers in adequate content can change the brittle mode of shear collapse into a ductile flexural mechanism.

关 键 词：混杂纤维 自密实混凝土梁 破坏形态 极限剪力 箍筋 

分 类 号：TU375.1[建筑科学—结构工程] TU528.572