The Investigation To Seismic Performance Of Eccentrically Braced Steel Plate Shear Walls

As a good lateral resisting force system, eccentrically braced steel frame could meetthe capacity and design demand in strong earthquake region, but the general applicationis limited, because it causes excessive plastic deformation and the repairing work ofbeam and floor after earthquake is heavy. Aiming at these problems, this paper suggestsa new braced steel frame system, eccentrically braced steel shear wall, adding a steelplate shear wall in the center of X-eccentrically braced steel frame. By using FEMsoftware ANSYS, the seismic behavior of eccentrically braced steel shear wall isstudied. The main contents and results of this dissertation are listed as following:1) Quasi-static test of D-two-tier eccentrically braced steel frame is simulated byANSYS,which is compared with the experiment on the hysteresis curves,backbone curves, and stress distribution. The finite element results coincide withthe test results which provide a basis with the following extensive analysis ofeccentrically braced steel shear wall.2) Eccentrically braced steel plate shear wall is compared with X-eccentricallybraced steel frame in aspect of the monotonic loading curves, hysteresis curves,backbone curves, energy dissipation coefficient, stress distribution anddeformation. The results indicate that the new system can not only effectivelyguarantee the brace against buckling, but lighten breakage of the beams andfloors, lighten repairing load after earthquake; and it has preferable energydissipation capacity and enough bearing capacity.3) By changing the size of concentrical steel plate shear wall, this paper designsthree eccentrically braced steel plate shear wall with different parameters. According to the respective monotonic and cyclic loading, the comparativeanalyses of the monotonic loading curves, hysteresis curves, backbone curvesand energy dissipation coefficients are conducted. The results indicate that withthe decreasing of concentrical steel plate shear wall size, the bearing capacity ofthe structure declines, while the descend range is no more than10%; When theconcentrical steel plate shear wall is1/3times the size of structure of the outerframe, the bearing capacity and energy dissipation capacity of structure arebetter.4) By changing the length of link beams, this paper designs five eccentricallybraced steel plate shear wall with different parameters. According to therespective monotonic and cyclic loading, the comparative analysis of themonotonic loading curves, hysteresis curves, backbone curves and energydissipation coefficients are conducted. The results indicate that compared withflexural buckling link beams, shear yielding link beams are better for thestructural Seismic performance; When the length of link beams is in the range of1.0M p V p~1.3M p V p, the bearing capacity and energy dissipation capacity ofstructure are better.5) By changing the height-to-thickness of insert plate, this paper designs fiveeccentrically braced steel plate shear wall with different parameters. thecomparative analyses of the hysteresis curves, backbone curves and energydissipation coefficients are conducted. The results indicate that When theheight-to-thickness of insert plate is200, the bearing capacity and energydissipation capacity of structure are better.