Plane Layout Vertical Layout T kymdedanaome · Bottom Strengthening Region Limit of Axial-Load Ratio 口Purpose principle, When 150m.1/10 I(degree)Il (7,degree)l WkcA0.40.50.6 Boundary Member Restraining Boundary Membe 口ength of wall:k Restraining boundary membe member ·&61a2x2m8 no0 0.20 0.20 0.20 025 mn at the5 Plane Layout  Principle：  Increase the integral lateral stiffness, but not too high;  Try to make the stiffness center superpose upon the centric to reduce eccentricity and avoid torsion;  Avoid short-width wall;  The length of wall should be shorter than 8m and the height-to-width should be lager than 2;  Wall should be arranged in two ways along the main axis and the axis of wall should align to the axis of frame.  It’s inappropriate to set the frame beam onto the tie beam. Vertical Layout  Principle：  The shear wall should be arranged continuously from bottom to top;  Openings should be lined up in the same place. Irregular openings should be strengthened;  Pay attention to the situation that the shear wall is set upon beams. These beams are frame-supported beams, so their seismic intensity should be upgraded. ;  Try to avoid weak layer. The shear force of weak layer should multiply the amplification coefficient 1.15;  The out-of-plane stiffness should be controlled. Bottom Strengthening Region  Purpose： To ensure draw ability after plastic hinges appear in the shear walls, the strengthening region at the bottom should be reinforced.  Principle：  1/8 of the total height of shear wall， When H>150m, 1/10  Or reinforce the two stories at the bottom Limit of Axial-Load Ratio  principle：  Increase wall’s drawability to make the shear walls at the bottom form plastic hingles when facing rare earthquake, avoiding brittle failure.  Axial pressure N based on representative value of gravity load. (different from colums) Axial-load ratio Ⅰ（9 degree）Ⅱ（7,8 degree） Ⅱ N/fcA 0.4 0.5 0.6 Boundary Member  Restraining boundary member  Constructing boundary member  Principle  Restraining boundary member：the ends of Grade 1 and 2’s shear wall’ bottom￾strengthening region and the first story above;  Constructing boundary member：the rest ends of Ⅰ,Ⅱ shear wall. The ends of Ⅲ,Ⅳ shear wall and non-seismic design wall. Restraining Boundary Member  Length of wall: lc  Volume stirrup ratio:  Characteristic value of stirrup: v Item Ⅰ（9 degree） Ⅰ（7,8 degree） Ⅱ  v 0.20 0.20 0.20 lc (embedded column) 0.25hw 0.20hw 0.20hw lc (flanking column or column at the end of wall) 0.20hw 0.15hw 0.15hw c v v yv f f   