高强箍筋混凝土梁的受剪性能  

Shear Behavior of Reinforced Concrete Beams with High-Strength Stirrups

作　　者：李艳艳[1] 戎贤[1] 皮凤梅[2] 乔金丽[1] 

机构地区：[1]河北工业大学土木工程学院,天津300130 [2]廊坊师范学院建筑工程学院,河北廊坊065000

出　　处：《华南理工大学学报（自然科学版）》2009年第8期89-93,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家"863"高技术计划资助项目(2004AA33G050);河北省自然科学基金资助项目(E2007000064)

摘　　要：为了研究以500MPa钢筋为箍筋的混凝土梁在集中荷载和均布荷载下的受剪性能,对12根混凝土梁进行了试验研究,分析了高强箍筋混凝土梁的斜截面受剪承载力及其在使用阶段的斜裂缝宽度.研究结果表明:此类构件的受力特征与普通钢筋混凝土受剪构件的相同,其斜截面受剪承载力仍可按GB 50010—2002公式进行计算;与国外规范相比,我国受剪承载力设计公式可靠度在国际上尚处于较低水平,但仍是偏于安全的;受剪梁斜裂缝通过处的箍筋应力能够达到屈服,为了保证正常使用阶段斜裂缝宽度满足限值要求,箍筋屈服强度的设计值不宜超过360MPa.Twelve reinforced concrete （RC） beams with 500 MPa steel bars as the stirrups were tested to investigate the shear behavior respectively under concentrated and uniformly-distributed loads, and the shear capacity of the diagonal section and the diagonal crack width of the beams in the service stage were analyzed. Experimental results show that （ 1 ） the RC beams with high-strength stirrups are similar to those with conventional stirrups in terms of mechanical behavior, and that the shear capacity of the diagonal section can still be calculated according to GB50010--2002; （2） although the reliability of the formula presented in Chinese codes is lower than those foreign codes＇, it is strong enough for safety; （3） the tensile stress of stirrup across the diagonal crack can reach the yield point; and （4） the designed yield strength of stirrup should not exceed 360 MPa for the purpose of meeting the requirement for the maximum diagonal crack width of RC beams in the service stage.

关 键 词：混凝土梁 高强箍筋 受剪承载力 斜裂缝宽度 

分 类 号：TU375[建筑科学—结构工程]