Seismic Anchorage of Structural Walls (ASCE 7)

Output:

Definitions
• F_p = Seismic Anchorage Force
• h_trib = Height of wall tributary to support or anchor
• w_trib = Width of wall tributary to support or anchor
• W_unit = Unit weight of wall (psf)
• W_p = Tributary weight of wall (lb)
• S_DS = Design spectral acceleration at short periods
• I_e = Seismic importance factor
• L_f = Span of the flexible diaphragm that provides support for the wall (ft)
• k_a = Amplification factor for diaphragm flexibility
Determine weight of wall tributary to anchor or support
• W_p = W_unit h_trib w_trib = (250)(56)(12)/ (144 in²/ft²) = 1166.7 lb
Determine minimum out-of-plane force
• F_po = 0.4 S_DS I_e W_p > 0.1 W_p
• F_po = 0.4 (0.85) (1) (1166.7) > 0.1 (1166.7)
• F_po = 396.7 > 116.7
• F_po = 396.7 lb
Determine minimum in-plane force
• k_a = 1.0 + L_f/100 < 2.0 = 1.0 + (10)/100 < 2.0 = 1.1
• F_pi = 0.4 S_DS k_a I_e W_p > 0.2 W_p
• F_pi = 0.4 (0.85) (1.1) (1) (1166.7) > 0.2 (1166.7)
• F_pi = 436.3 > 233.3
• F_pi = 436.3 lb
User Notes:
User notes