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Design Load (Seismic Load)Lee & Lee Structural Engineering Inc. <br />Vertical Distribution of Seismic Force ASCE 7-16, Section 12.8.3 <br />F x =C vx V ASCE 7-16, EQ. 12.8-11 <br />ASCE 7-16, EQ. 12.8-12 <br />C vx vertical distribution factor <br />V total design lateral force or shear at the base of the structure <br />w i and w x the portion of the total effective seismic weight of the <br />structure(W) located Level i and x <br />h i and h x the height from the base to Level i and x <br />k an exponent related to the structure period <br />1 B.1 for Ta is less than 0.5 sec <br />2 for Ta is more than 2.5 sec <br />k=1+(Ta-0.5)/2 for Ta between 0.5 and 2.5 sec <br />k = <br />V =W =Strength Design <br />W =ASD <br />ρ V =W = <br />Redundancy Factor ρ for Seismic Design Categories D through F ASCE 7-16, Section 12.3.4.2 <br />For structures assigned to Seismic Design Category D, E, or F, ρ shall equal 1.3 <br />2nd Floor (Plan N-S Direction)unless one of the following two conditions is met, whereby ρ is permitted to be taken as 1.0 <br />a)Each story resisting more than 35 percent of the base shear in the direction of interest shall <br />comply with Table 12.3-3. <br />b)Structures that are regular in plan at all levels provided that the seismic force-resisting systems51 <br />consist of at least two bays of seismic force-resisting perimeter framing on each side of the <br />structure in each orthogonal direction at each story resisting more than 35% of the base shear. <br />The number of bays for a shear wall shall be calculated as the length of shear wall divided by <br />the story height or two times the length of shear wall divided by the story height for lightframed <br />construction. <br />ρ =1.3 <br />0.38 35.3 <br />21.9 <br />13.40 <br />21.86 <br />38.75 <br />27.12 <br />(kips) <br />27.42 <br />F x <br />99.83 <br />ft 2 <br />w x h x <br />k <br />0.62 <br />Σw i h i <br />k (kips) <br />0.162 <br />3993 35 <br />0.113 <br />0.147 35.26 <br />Area DL <br />1677139.76 <br />27.4 <br />12.0 <br />253993 <br />h x ,ind h x <br />khx,accum <br />(ft) <br />12 <br />Accu. F xwxhx <br />kwx <br />12 <br />2737 <br />psf <br />5.48 <br />3.35 <br />Level x <br />(ft) <br />2nd <br />Roof <br />(psf) <br />15.42 <br />1.04414239.6 <br />1.000 <br />(kips) <br />8.83 <br /> <br />k <br />x x <br />vx n <br />k <br />i i <br />i=1 <br />w hC = <br />w h <br />Vertical Distribution <br />68 of 81 <br />210 W 19th St <br />4/14/2025