Test Analysis And Strut-and-Tie Method Of The Beam-Wider-than-Wall Eccentric Joint

Frame and shear wall structures are very popular in multi-story buildings. Up to now , however, most researches about the short-pier shear walled and special shaped column mainly focuse on the member's mechanism and analysis method. And the research on beam-wider-than-wall joint is few and can not satisfy the application requirement.Based on earlier research by postgraduates of Chongqing University, new specimens were designed to evaluate the correctness of the anchorage length formula in Huanglu's master thesis[4] and to examine the change of beam's height, bar diameter and the ratio of longitudinal reinforcement. Through experiment and theoretical analysis, the Strut and Tie Model and design method of eccentric joint were proposed.The conclusion are drawn as follows:1 According to experimental results, the longitudinal bar's anchorage length according to Huanglu's master thesis[4] can basically meet capacity and ductility of joints . But in contrast with earlier specimens, the specimens with increase of height, diameter of longitudinal bars and longitudinal bars have poor performance, for example, the longitudinal bars have more serious, uneven stress along the beam width, local spalling in shear wall and larger deformation.2 Test indicates that increase of height, diameter of longitudinal bars and longitudinal bars have a little effects on deformation, failure model and mechanism of specimens.3 On the basis of the test and analysis, the author advances the mechanism of the beam-wider-than-wall eccentric joint ,comes up with Strut-and-Tie Model , and proposes new Strut-and-Tie design method of the beam-wider-than-wall eccentric joint.