腹部开有圆孔的钢筋混凝土简支梁的试验研究

Experimental study of simply supported reinforced concrete beams with circular web openings

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完善的设计方法及系统化、参数化的试验研究支持。研究进行29个腹部开设圆孔的钢筋混凝土简支梁试件在集中荷载下的试验,分析孔洞尺寸及位置、加强腹筋形式及数量、剪跨比、孔洞间距和混凝土强度等因素对开孔梁的裂缝开展及破坏形态、应变分布特点、承载力和变形等力学性能的影响,总结以上各因素对开孔梁力学性能的影响规律,为开孔梁力学模型和设计方法的建立提供试验依据。

It is one of the most effective means to reduce the inter-story height of a reinforced concrete （RC） structure to employ RC beams with openings in the web. Up to now, effective design theory and analysis method for RC beams with openings in the web have not been established and systematic and multi-parameter experimental studies on the performance of RC beams with openings were not adequate. An experimental study of 29 simply supported RC beams with circular web openings under concentrated loads was carried out. Factors that influence the mechanical properties of the beams with circular web openings, including the size, location and eccentricity, spacing of web openings, ratio of shear span to effective section depth, and form and amount of reinforcement around the openings, were fully investigated. Influences of these factors on the failure pattern, bearing mechanism, shear resistance and rigidity were also obtained and discussed.