开矩形孔的钢筋混凝土梁的试验研究  

Experimental Investigation of Reinforced Concrete Beam with Rectangular Opening

作　　者：黄泰赟[1] 蔡健[1] 陈静芬[1] 

机构地区：[1]华南理工大学土木与交通学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2008年第10期20-24,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：广东省自然科学基金资助项目(020965)

摘　　要：采用钢筋混凝土开孔梁是降低建筑层高的有效途径,但迄今仍缺乏对开孔梁系统的多参数试验研究.文中进行了20个腹部开设矩形孔的钢筋混凝土简支梁试件在集中荷载下的试验.结果表明:梁开设孔洞后,其抗剪承载力下降,其挠曲变形特点也不同于一般的实腹梁;孔侧配置加强箍筋和加强斜筋都可以提高开孔梁的抗剪承载力;当孔侧加强腹筋和弦杆的配箍足够大时,可避免梁发生剪压破坏;孔洞上方混凝土可视为偏心受压杆件,孔洞下方混凝土可视为偏心受拉杆件,两种杆件的杆中均存在反弯点.文中还提出了开矩形孔的钢筋混凝土梁的抗剪承载力计算方法.One of the most effective methods to reduce the story height is to use reinforced concrete （RC） beam with opening. However, there is a lack of systematic multi-parameter experimental investigations of such beams. In this paper, 20 simply-supported reinforced concrete beams with rectangular openings were tested under concentrated load. Experimental results show that （ 1 ） the beam with rectangular opening is of a reduced shear capacity and special deflection deformation characteristics different from those of common beams; （2） both the strengthening stirrups and the bent-up steel bars at the opening sides improve the shear capacity of the beam; （3） the shear-compression failure can be avoided if the transverse reinforcements and the stirrups of chords are large enough; and （4） the concretes above and below the opening can be considered as an eccentric compressive component and an eccentric tensile one with anti-bending point, respectively. A prediction method of bear capacity of the RC beam with rectangular opening is also proposed in this paper.

关 键 词：钢筋混凝土梁 矩形孔 受力性能 抗剪承载力 

分 类 号：TU375.1[建筑科学—结构工程]