Test Research On The Beam-wider-than-wall Eccentric Joint

Frame and shear wall structures are very popular in multi-story buildings. To thepresent, however, most research about the shin-walled and special shaped column or shearwall is focused on the member's mechanism and its analysis method. There is fewresearch on beam-wider-than-wall joint and can not satisfy the application requirement. Based on the analysis of my classmate Li pingchang, three specimens are designedto investigatet the beam-wider-than-wall eccentric joint behavior. The stress distribution,deformation, failure mode and mechanism are described clearly in the test result. Thefollowing conclusions can be drawn from the test. The joint's load-bearing capacity and deformation capacity is not enough ifstraight-line anchoring length which the Code defines is just met without the right-angledanchoring method and the stirrup ratio is too low. Two ways can improve the joint's bearing capacity and ductility. One is that theright-angled anchoring method is adopted. The other is that the ratio of stirrup in the beamis oversized. But considering the improvement of anchoring stiffness and the decrease ofcrack on the flank the former is more effective. There are two mechanism in the beam-wider-than-wall eccentric joint in whichthe right-angled anchoring method is adopted. One is a spatial-truss mechanism. Theother is a kind of extrusion pressure formed by the concrete under the longitudinal bar'shook and vertical sector. And their proportion is basically equal in the engineering design. In the bending-anchoring eccentric joint the beam-wider-than-wall width shouldbe added to 0.4laE when we consider the minimum anchoring length of longitudinalbar's horizontal sector.