Seismic Restraint

1
Seismic Restraint

• Example
• Using ANSI/SMACNA SEISMIC RESTRAINT MANUAL
  GUIDELINE FOR MECHANICAL SYSTEMS THIRD EDITION

2
Example

• Single run of rectangular duct
• Top of duct is 5-8 from to supporting structure
• Duct size 58 x 24
• Cs .80 so SHLA Provided by designer

3
Example

• First determine the applicable figures in Chapter
  4.
• Can not use Figures 4-2 thru 4-4
• too far from the structure
• Figures 4-5 thru 4-7 qualify
• Note Figure 4-8 is for floor supports
• Because of preference and jobsite conditions we
  will use Figure 4-7

4
Example

• Figure 4-7
• Note 3, Since L 5-8 we need to use table 5-3,
  6-3, 7-3, or 8-3
• In our case SHL A (Chapter 5)
• Use Table 5-3

5
Example
6
Example
7
Example
8
Example