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SECTION 01451
SEISMIC CONTROL – OSHPD
PART 1 - GENERAL
1.01
DESCRIPTION
A.
1.02
1.03
Provide all required seismic restraints and calculations in order to insure that the
installation of all architectural, mechanical, and electrical equipment/components are in
compliance with all applicable seismic codes, standards, and specific information listed
herein.
QUALITY ASSURANCE
A.
ASTM standards
C.
2013 California Building Code, Title 24 (CBC)
SUBMITTALS
A.
Product Data: Submit manufacturer's technical product data and installation instructions
for each type of material listed in this Section.
B.
Submit special seismic certification (OSP) for mechanical and electrical
equipment/components as noted on CBC 1705A.12.4. Contractor shall bear all costs
associated with any and all tests, engineering calculations and documentation required to
obtain OSHPD approval in accordance with this section in a timely manner if the
Contractor chooses to select equipment that does not already have special seismic
certification as noted on the design documents.
C.
Submit OSHPD Pre-approved Manufacturer’s Certification (OPM) as noted on the design
drawings.
PART 2 - PRODUCTS
2.01
SEISMIC RESTRAINT REQUIREMENTS
A.
SUMMARY
1.
This section covers the seismic restraint requirements for suspended vibration
and non-vibration isolated items, systems and/or related suspended equipment.
2.
The designers of record as referenced in this specification shall be the project
architect, structural engineer and the appropriate system engineer (e.g.,
electrical, etc.).
3.
OSHPD OPM shall be considered the specified seismic design for this project.
Other designs may be submitted as an alternate provided they meet or exceed
all of the requirements contained within these specifications, and provided they
meet or exceed all of the OSHPD pre-approved service loads, installation
applications, engineering services, etc. Furthermore, said other OSHPD preapproved designs must be submitted to the designers of record for review and
acceptance, and to OSHPD as a deferred approval prior to installation, with all
costs including but not limited to project delay costs, to be borne by the
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contractor.
B.
SEISMIC RESTRAINT DESIGN
1.
2.
3.
The attachment, supports and seismic restraints of suspended non-structural
components and distribution systems listed below shall be designed to resist the
total design seismic forces prescribed in the CBC.
a.
All equipment/components including but not limited to: electrical,
mechanical, plumbing, and architectural.
b.
Without referencing OPM or OSHPD approved seismic attachment and
supports shown on the design document, seismic support and
attachment shall be engineered and built by the applicable system
contractor. Engineering shall be (signed & sealed) by a licensed
California Structural Engineer and submitted to the designers of record
and OSHPD for acceptance prior to installation. Cost to be borne by the
contractor.
c.
Design and installation shall consider seismic relative displacement in
accordance with ASCE 7-10 – 13.3.2.
Seismic restraint transverse and/or longitudinal spacing shall not exceed CBC
requirements and the lesser of the following;
a.
That which develops seismic design forces equal to or less than the
capacity of the building structure.
b.
That which develops seismic design forces that are equal to or less than
the capacity of weakest part, component, anchorage, etc., contained
within the seismic brace assembly.
c.
40’ feet transversely and/or 80’ feet longitudinally where pipes, conduits,
and their connections are constructed of ductile materials (copper,
ductile iron, steel or aluminum and brazed, welded or screwed
connections).
d.
20’ feet transversely and/or 40’ feet longitudinally where pipes, conduits,
and their connections are constructed of nonductile materials (e.g., cast
iron, no-hub pipe and plastic).
e.
20’ feet transversely and/or 40’ feet longitudinally for bus ducts and cable
trays, baskets, channels.
Contractor shall not adopt, use or otherwise implement the omission of any
seismic restraints without prior review and acceptance by the designers of
record. Submittals for omission of seismic restraints shall be limited to piping,
ducts and conduits. All submittals for omission of seismic restraints must
included the following, and must be (signed & sealed) by a licensed California
Structural Engineer and approved by OSHPD;
a.
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Project specific cover letter clearly indicating that said engineer has (with
respect to the attached submittal for omission of seismic restraints)
completely review the project documents including these specifications,
the items/systems designs individually and in coordination with all other
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trades, and that all code and/or project specified requirements for
omission of restraints have been meet individually and in combination
with each other, that (if the attached submittal for omission is approved)
said engineer has been hired/retained by contractor to visit the project
site without limit to review and inspect the installation of the
items/systems which have been reviewed and approved for installation
without seismic restraints.
b.
Engineered details and engineering for all vertical supports and their
connections to the building structure to qualify, that top connections
cannot develop moments, that lateral motion will not cause loss of
item/system support, that lateral motion of the item/system will not cause
damaging impact with other items/systems, that lateral motion of the
item/system will not directly or indirectly impact any life safety,
emergency services and/or hazardous items/systems or their supports.
4.
Seismic hardware brackets shall provide a (Captive) 360-degree connection that
completely encloses or encircles the rod, anchor, bolt, fastener, etc. Open hook
and/or open slot seismic hardware brackets shall not be allowed.
5.
Seismic restraint assembly connections shall not incorporate the use of break-off
bolts or nuts and pneumatic fasteners.
6.
Seismic restraint cables shall be looped through the seismic hardware bracket
and turned back onto itself at the point of assembly/connection. Cables shall not
be installed or attached to the seismic hardware bracket in a straight through
(non turn back) method of assembly/connection.
7.
Seismic hardware brackets, connectors and related components shall be
constructed entirely of malleable iron or steel. Seismic assemblies shall not
include the use of cast components.
8.
Ceiling and other types of single strand wire shall not be used as a seismic
restraint, sway brace and/or safety restraint material.
9.
The connection to the building structure of non-seismic sway bracing and/or
safety restraints shall meet or exceed that required for the attachment of seismic
restraints to the building structure.
10.
Seismic restraints shall be installed to provide a minimum of (2) transverse and
(1) longitudinal braces per run. A “run” shall be defined as a length of 5’ feet or
more.
11.
The accumulated load of multiple items to any given support (with or without
seismic restraints) shall be limited so as not to overload the building structure
and the support assembly.
12.
Pipes, conduits, and other items attached to trapeze hangers shall be located
above each individual trapeze hanger so that the accumulated load is evenly
distributed.
13.
Trapeze systems installed in a multi-layer configuration shall have seismic
restraints designed and installed for each individual trapeze layer.
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14.
Vertical supports shall be designed and installed to account for vertical tension
and compression loads including accumulated seismic component increases.
15.
Vertical supports, single hanger, trapeze hangers and their clamps, clips and
methods of connection shall be constructed of ductile materials (e.g., copper,
ductile iron, or steel).
16.
Do not use insulation inserts (e.g., cal-sil, metal, etc.) at seismic brace
connection locations without prior written approval from the structural engineer.
Do not connect seismic bracing to insulation inserts without prior written approval
from the structural engineer.
17.
Design of supports, seismic restraints and anchorage to the structure shall
consider all conditions that involve thermal, structural separation, relative
displacement, building expansion and contraction.
18.
Use following criteria for seismic bracing of electrical conduits:
a.
19.
Wherever combined weights of multiple conduits plus contents on a
trapeze equals or exceeds the weight of a single 2-½” conduit plus
contents, brace trapeze system in accordance with CBC.
The following conduit plus contents weight data may be used for EMT in lieu of
SMACNA guidelines:
CONDUIT PLUS CONTENTS WEIGHT DATA
EMT SIZE (IN)
LBS/FT
½
0.53
¾
1
1-¼
1-½
2
2-½
0.88
1.30
1.90
2.70
4.40
5.70
3
3-½
4
9.40
10.00
12.50
20.
Weight per trapeze support assembly must be calculated from above table and
spacing between support assemblies.
21.
For assemblies carrying less than 320 LB., down to equivalent of a single 2-½”
conduit plus contents, use 320 LB criteria or submit alternate details for approval.
22.
All single conduits 2-½” and larger shall be braced in accordance with these
guidelines and SMACNA details.
23.
SMACNA details shall not be used without prior approval by Structural Engineer
of Record (SEOR).
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C.
ACCEPTABLE MANUFACTURERS
1.
D.
E.
OSHPD Pre-approved Certified Manufacturer (OPM)
ANCHORS, INSERTS AND FASTENERS
1.
All anchors, inserts, fasteners or connections to the structure shall be submitted
to the structural engineer of record for review and acceptance prior to installation.
2.
Do not use any anchor or insert in concrete or metal decking with concrete fill,
which does not have a signed structurally engineered design value based on its
installed application and one of the following:
a.
ICC evaluation report
b.
OSHPD pre-approved
3.
Cast-in-place inserts used in concrete or metal decking with concrete fill, shall be
constructed entirely of malleable iron or steel.
4.
Cast-in-place inserts that contain internal threads shall include the installation of
a jam or lock nut to secure the connection of the vertical support rod to the castin-place insert.
5.
Cast-in-place inserts that allow for horizontal adjustment shall not be allowed,
unless an engineered solution is provided to assure positive captive positioning
and securement of the attachment.
6.
Do not use powder driven and power driven (Shoot-In) fasteners, expansion nails
or internally threaded anchors in concrete or metal decking with concrete fill
without prior approval of the Project Manager.
7.
All beam clamps shall be constructed of malleable iron or steel. All single flange
mounted beam clamps shall include a retaining strap or J-hook and must be
submitted to the project structural engineer of record of review and acceptance
prior to installation. Beam clamps shall not be used to resist seismic loads.
FIELD QUALITY CONTROL
1.
Inspection of seismic restraints by the Inspector of Record (IOR), and/or
Authority Having Jurisdiction (AHJ).
2.
Make all corrections recommended by the designers of record after approval by
the University and OSHPD.
PART 3 - EXECUTION
3.01
SEISMIC ANCHORING AND RESTRAINTS
A.
Equipment anchors:
1.
All equipment shall be anchored. Anchor equipment per details shown on the
drawings where provided.
2.
Anchor installation shall be in accordance with the current ICC report.
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3.
B.
Conduit supports:
1.
C.
Provide independent seismic support system for all lighting fixtures.
Minimum clearance:
1.
3.02
Conduits shall be supported and braced per CBC Title 24.
Lighting fixture supports:
1.
D.
Anchor details provided are based on specific equipment information. Submit
design for approval for anchoring of equipment which varies from design.
Diagonal braces and hanger supports shall maintain 6 inches minimum
clearance from unbraced ducts and conduits, and 1 inch minimum clearance
from braced ducts and conduits.
INSTALLATION AND TESTING OF MECHANICAL ANCHORS:
A.
Where permitted in other Sections of this specification, drilled-in expansion-type anchors
or other post-installed concrete anchors may be used in hardened concrete.
B.
All post-installed concrete anchors shall be tested. Testing shall be performed in the
presence of the Inspector of Record. Number of anchors to be tested shall be as shown
on the drawings with a minimum of 50% of anchors installed and at each support. Testing
shall be performed by torque or pull test, and to the values noted on the drawings. Test
loads, frequency and acceptance criteria of post-installed anchors in concrete shall be in
accordance with CBC 1913A.7.
C.
Internally threated shell-type anchors and displacement controlled anchors (e.g., drop-in
anchors, screw anchors, adhesive anchors, etc.) shall not be tested using a torque
wrench.
D.
Screw anchors shall be installed with a calibrated torque wrench and may be loosened a
maximum of one full turn to facilitate the positioning of a tension test collar. Following the
tension test, the anchor shall be re-torqued in accordance with the manufacturer’s
installation instructions.
E.
Tension test of chemical/adhesive anchors and power actuated fasteners shall be in
accordance with CBC, Title 24, and as noted on the drawings.
F.
All testing procedures shall be in accordance with CBC 1913A.7, and as noted on the
drawings.
END OF SECTION 01451
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