Seismic Behavior Of Fuse Steel Coupling Beams In Shear Wall Structures

During last decades in order to enhance the post-earthquake damage repair capability of the shear wall systems,various configuration of replaceable steel coupling beam was proposed and investigated.Reasonable designed fuse coupling beam has good rigidity,bearing capacity and energy dissipation ability,but due to lack of research,current design methods doesn’t consider section parameters of replaced steel beam and there are not recommendations for imroving seismic perfomance as well.Therefore,beams with various width-to-thickness ratios of flanges and webs are designed in this dissertation.Numerical simulation are carried out to study their seismic perfomance.The main research contents are as follows:(1)The design method of replaceable steel coupling beam in a shear wall system was described.By modifying section parameters,such as beam length,widthto-thickness ratio both web and flange,stiffener,four groups of steel fuse beams were presented and described.(2)The finite element analysis software Abaqus is used to model and simulate the fuse steel coupling beams.An accurate and effective simulating method is described.The modeling and published in research papers results are compared and analyzed,verifying the reliability of finite element simulation.(3)The structural and seismic perfomances were analyzed.The effects of section parameters are described and studyied..The energy dissipation capacity of shear-yield and flexure-yield modes are compared.The influences of section parameters and structural elements on the mechanical and seismic behaviour of the steel coupling beams are summarized.(4)The detailed mechanical perfomance and yield mode analysis of steel fuse coupling beam are carried out.According to results the limitations of the trasition from shear-critical to flexural-critical are indicated.Describing the influence of width-to-thickness ratio and stiffeners spacing on the stiffness degradation and energy dissipation coefficient.Based on the analysis assumptions recommendation and suggestions for the design of fuse steel coupling beam with good seismic perfomance will be requested.