大剪跨比下新加RC梁端/原柱界面受剪性能试验研究  

Experimental Study on Shear Behavior of the Interface between New Added RC Beam and Column under Large Shear Span Ratio

作　　者：王新玲[1] 王元森 朱俊涛[1] WANG Xinling;WANG Yuansen;ZHU Juntao(School of civil Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学土木工程学院,郑州450001

出　　处：《结构工程师》2019年第5期156-163,共8页Structural Engineers

摘　　要：为了探究大剪跨比时新加RC梁端与原RC柱的界面受剪性能,以剪跨比(λ=1~4)、梁底受压区纵筋及荷载分布形式为影响参数,设计制作了两组共12个试件。试验分析了上述影响因素对新加梁端部与原柱混凝土界面抗剪性能的影响规律。结果表明:界面极限荷载随着λ的增大而减小。当λ≤2时,界面发生剪切破坏,界面极限荷载对应的界面滑移值变化不大;当λ>2后,极限荷载及相应的滑移值均明显减小,界面发生受弯破坏。与集中荷载作用相比,均布荷载作用下的界面抗剪承载力较大,但两种荷载作用下的界面破坏形态基本相同。梁底受压区配置纵筋,对试件的破坏形态及界面承载力影响不大,但可适当增加界面的延性。In order to investigate the interface shear performance of the original column and new added RC beam under large shear span ratio,a total of 12 specimens are designed and tested with different parameters of shear span ratio(λ=1~4),the longitudinal reinforcement at the beam compressive zone and load distribution form.The influence of the above factors on the shear properties of the concrete interface between the new added beam and the original column is analyzed.The results showed that the bearing capacity of new-old concrete interface of beam-column decreased with increment of the shear span ratio.Whenλ≤2,the interface slip corresponding to the interface ultimate load does not change much,and the shear failure occurs at the interface.Whenλ>2,the ultimate load and the corresponding slip value decreases significantly,and the bending damage occurs at interface.Compared with concentrated load,the effect of uniform load on the interface becomes larger,but the failure modes are basically the same.There has little influence on the failure mode and interface bearing capacity of the specimens when the compression zone of beam bottom is equipped with longitudinal bars,but which can increase the ductility of the interface appropriately.

关 键 词：结构加固 界面抗剪性能 大剪跨比 试验研究 

分 类 号：TU3[建筑科学—结构工程]