EARTHQUAKE PROTECTION

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1 EARTHQUAKE ASHRAE PROTECTION The following details can be used to help prevent the effects of earthquakes on: Mechanical Systems Electrical Systems Piping Cable Trays, Ductwork Bus Ducts Suspended Equipment Conduit Floor Mounted Equipment Plumbing Systems Piping Fire Protection Systems Piping S A H E R A American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. 1

2 Suspended systems such as piping, equipment and ductwork need seismic braces to keep them from swaying during an earthquake. Seismic braces can be flexible using aircraft quality cables, or rigid (solid) using steel sections such as pipe, angles, or strut channels. Braces are typically installed ft (10-13 m) apart, at system turns and at the end of runs. Braces are attached to the pipe/duct at horizontal supports such as clevis s or trapezes. The other end is attached to structure such as overhead concrete slabs or structural steel. Suspended equipment requires a minimum of four braces, one at each corner. Floor mounted equipment needs to be anchored to the structural slab. This also includes equipment that is Vibration Isolated with seismic snubbers. Pipe, Cable Trays, Bus Ducts & Conduit Bracing Details Cable Bracing CLAMP CLAMP TENSION LOAD (REACTION) NO LOAD ON CABLE SWAY BRACE FORCE CLEVIS TRANSVERSE BRACE LONGITUDINAL BRACE TRANSVERSE & LONGITUDINAL CABLE BRACE FOR HORIZONTAL SUSPENDED PIPE FIGURE 1 2

3 CLAMP CABLE BRACE FORCE PIPE SECURED TO TRAPEZE CABLE BRACE FOR TRAPEZE SUSPENDED PIPE FIGURE 2 Rigid or Solid Bracing CLAMP SOLID BRACE CLEVIS FORCE SOLID BRACE IN COMPRESSION FOR INDIVIDUALLY SUPPORTED PIPE FIGURE 3 CLAMP SOLID BRACE FORCE PIPE SECURED TO TRAPEZE SOLID BRACE IN COMPRESSION FOR TRAPEZE PIPE FIGURE 4 3

4 Cable Bracing ASHRAE Duct Bracing Details CLAMP CABLE BRACE HANGER ROD DUCTWORK SECURED TO TRAPEZE WITH SCREWS TRANSVERSE BRACE LONGITUDINAL BRACE CABLE BRACING OF SUSPENDED DUCTWORK FIGURE 5 Rigid or Solid Bracing CLAMP SOLID BRACE FPH C.G. F PV W H ADDITIONAL UPPER SUPPORT L F PV TRAPEZE SUPPORT SHEET METAL SCREW SOLID BRACE OF DUCTWORK ON TRAPEZE FIGURE 6 4

5 Suspended Equipment Bracing Suspended equipment requires bracing as shown in Figure 8 using rigid steel sections or Figure 7 using cables. Connections to the equipment such as piping, conduit or ductwork should be made with flexible connections. CLAMP O = 30 TO 60 HANGER ROD ROD (WHEN REQUIRED) CABLE BRACE CABLE BRACE (4)-TYPICAL HANGER ROD ELEVATION PLAN VIEW TYPICAL CABLE BRACE ARRANGEMENT FIGURE 7 SOLID BRACE CLAMP SOLID BRACE (4)-TYPICAL S SOLID BRACE O = 30 TO 60 ELEVATION PLAN VIEW TYPICAL SOLID BRACE ARRANGEMENT FIGURE 8 5

6 Floor Supported Equipment Floor mounted equipment may be bolted down if no vibration isolation is required. If the equipment is isolated then the equipment must either have bumpers as shown in Figure 9 or snubbers as shown in Figure 10. TWO BOLTS PER BRACKET A A ANCHOR BRACKET (2) PER SIDE PLAN VIEW NO CLEARANCE ANCHOR BRACKET STRUCTURAL ANCHOR 1/4" NEOPRENE DETAIL A-A ANCHOR BRACKET CONNECTED TO FIGURE 9 (SHOULD BE CONNECTED TO STEEL FRAME OR CONCRETE INERTIA BASE) HEIGHT SAVING BRACKET (TYPICAL) VIBRATION ISOLATOR (TYPICAL) CROSS BRACING LOCATED AT OR NEAR SNUBBERS SNUBBER (TYPICAL) STEEL FRAME OR CONCRETE INERTIA BASE SUPPLEMENTAL BASE - OPEN SPRINGS AND SNUBBERS FIGURE 10 6

7 Anchor Bolts Anchor bolts are one of the most important parts of a correctly designed and installed Seismic Restraint System. The most widely used anchors for seismic restaints are the wedge, adhesive and undercut. Proper installation of anchors is important. Basic installation methods for shell and adhesive anchors is shown in Figure 12. FIGURE 11 FIGURE 12 7

8 Sites with additional information: ASHRAE, American Society of Heating Refrigerating and Air Conditioning Engineers, ASHRAE Technical Committee TC 2.7 Seismic & Wind Restraint Design, FEMA, Publications 412, 413 & 414 USGS, United States Geological Survey, SMACNA, Sheet Metal and Air Conditioning Contractors National Association, VISCMA, Vibration Isolation and Seismic Control Manufacturers Association, ICC, International Code Council, National Fire Protection Association, AHRI, Air Conditioning, Heating and Refrigeration Institute, This publication was written by ASHRAE s Technical Committee TC 2.7, Seismic and Wind Restraint Design. All details in this document are from ASHRAE s Publication, A Practical Guide to Seismic Restraint, 2000, or FEMA Document 412 8

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