Experimental Study On Seismic Behaviors Of The Haunched Beam Transfer Structures With Varied Ratio Of Section Height To Section Thickness Of Short-leg Shearwall

There is still a shortage of theoretical studies on frame-supported short-leg shearwall structure, though it has been widely applied in present projects. Through quasi-static experiments on three haunched beam transfer short-leg shearwall structure specimens with respectively the ratio of section height to section thickness of wall-leg ranged from 5, 6, to7 under the vertical load and horizontal cyclic load, this paper made a comparative analysis on the results of the haunched beam transfer short-leg shearwall structure with different ratio of section height to section thickness of wall-leg, the macro-phenomenon in the whole course of the experiment, and stress distribution of all the parts as well, reached the conclusion that the ratio of section height to section thickness of wall-leg variations influences mechanical behavior of haunched transfer beam.The experiment and results of analysis researched the stress mechanics, bearing capacity, damage shape, damage mechanism, hysteretic characteristics, distortion ability and ductility factor of the transfer structure under vertical load and horizontal load, and the seismic behavior of the haunched beam transfer frame-supported short-leg shearwall structure under vertical and horizontal load. Rational design suggestions and constructional requirements are proposed to the application of this structure in practical projects.The results of the experiment revealed that the haunched beam transfer frame-supported short-leg shearwall structure has a good yield and damage mechanic, and the rationally designed frame-supported short-leg shearwall structure has a good seismic behavior. This sort of structure has a full hysteretic circle of the hysteretic loops, good ductility nature and dissipation ability, with a uniform distributed rigidity and a stable deformation nature for each layer in elastic and elastic-plastic deformation. Along with the ratio of section height to section thickness of wall-leg of the short-leg shearwall being enhanced, the rigidity of the structure is also noticeable enhanced, the endogen force becomes more evenly distributed and the bearing is more rational. However, when the wall-leg is stretched to a certain length, the favorable influence is no more obvious. The analysis of the three specimens shows that the short-leg shearwall with a moderate ratio of section height to section thickness of wall-leg has the best seismic behavior.