# Seismic Demands in Nonstructural Components (ASCE 7)

This calc determines nonstructural component seismic design forces per ASCE 7

## Input:

lb
g
ft
ft ## Output:

1. Definitions
• Fp = Horizontal seismic design force applied at the center of gravity
• Wp = Component weight
• SDS = Design spectral acceleration at short periods (0.2sec)
• Ip = Component importance factor (1.0 or 1.5)
• z = Height from the point of attachment to the seismic base
• h = average roof height of the structure with respect to the seismic base
2. Lookup the component parameters
• Component = Custom
• Amplification factor: ap = 1
• Response modification factor: Rp = 1
• Overstrength factor: Ω0 = 1 (for anchorage design in concrete or masonry)
3. Calculate the horizontal design force, Fp
• Fp = 0.4 ap SDS Wp (1 + 2 z/h) / (Rp/Ip)
• Fp = 0.4 (1) (0.85) (250) (1 + 2 (0)/(30)) / (1/1)
• Fp = 85 lb
4. Calculate the minimum and maximum force limits
• Fp,max = 1.6 SDS Ip Wp = 340 lb
• Fp,min = 0.3 SDS Ip Wp = 63.8 lb
5. Result
• Fp = max[Fp,min, min(Fp, Fp,max)]
• Fp = 85 lb