Transcript ABP Safety Update - Armstrong World Industries

IBC Seismic Code Standards and
Installation Requirements
Today’s Seismic Standards
What Is The IBC?
 It is the first model building code to
specifically address the differences in
seismic hazard based on soil type.
 It can significantly impact the cost of
installing suspended ceilings in areas
that have not historically required
seismic installations.
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Today’s Seismic Standards
How Big Is The Risk?
 Currently 45 states
use the International
Building Code
 66% of the U.S. is
now at some level of
risk
 25 – 40% chance for
a major quake in the
Midwest
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Today’s Seismic Standards
This is a complicated issue !
 Three variables determine a
Seismic Design Category
 Interpretation of installation
practices by code officials and
architects
 Integration of seismic information
into plans and specifications
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Today’s Seismic Standards
According to the International Building Code
[IBC], a Seismic Design Category must be
established for each construction project
based on three variables:
 anticipated ground motion
 type of soil in a specific geographic area
 seismic [building] use group designation
In the former CISCA zone classification, an entire
geographical area determined construction methods.
The IBC ‘project by project’ analysis is a major change!
The design team is responsible for the analysis required
to assign a Seismic Design Category to a project.
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Seismic Design Category – Variable 1
Determine Maximum Ground Motion
 Ground acceleration is
evaluated by location on
hazards maps
 Two maps are used to
list ground motion at 0.2
and 1 second periods
 Ground motion is
presented as a
percentage of the
acceleration of gravity
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Seismic Design Category – Variable 2
Determine [Soil] Site Class
 Soil type is evaluated to a depth
of 100'
 The “Site Class” is rated A
through F, where A is hard rock,
and F is more unstable soil
types
 Site Class D is used when
specific data is not available
unless class E or F soil types
are likely
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Seismic Design Category – Variable 3
Determine Seismic Use Group
A risk factor is assigned based on the
occupancy of the structure and how critical the
operability of the facility is in the event of a
disaster, such as an earthquake.
 Seismic Use Group I – normal occupancy
Examples: everything not assigned to another group
 Seismic Use Group II – high occupancy
Examples: schools, large office buildings and utilities
 Seismic Use Group III – essential use
Examples: police and fire stations; medical facilities
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Today’s Seismic Standards
Non-Structural Systems Get A Closer Look
 Before IBC: Suspended
ceilings could fail and
render a space unusable
 After IBC: Suspended ceilings – designed and installed
to meet IBC Seismic Design Categories – can survive
intact
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Today’s Seismic Standards
IBC Installation Requirements
for Suspended Ceilings
 Provide a suspension
system strong enough to
resist lateral forces
imposed upon it without
failing
 Prevent border panels from
falling from the ceiling
plane
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Perimeter Wires – Categories D, E, and F
Seismic Code Compliance
“Old” and “New” Code Comparison:
Seismic Design Category A and B
IBC Category
CISCA Zone
A, B
0-1
Installation Requirement
Ceiling installations should conform to basic
minimums established in ASTM C 636.
The IBC does not require any special ceiling
installation considerations in these categories
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Seismic Code Compliance
“Old” and “New” Code Comparison:
Seismic Design Category C
IBC Category
C
CISCA Zone
2
Installation Requirement
To be installed to CISCA recommendations for
areas subject to light-to-moderate seismic
activity:
 Minimum 7/8” wall molding
 Grid must not be attached to the wall molding
 3/8” clearance on all sides
 3/8” overlap of the grid on the wall molding
 Ends of main beams and cross tees must be tied
together to prevent their spreading
 No perimeter wires
The IBC installation requirements for Seismic Design Category [SDC] C exempts ceilings in most one
and two story buildings unless they are Seismic Use Group III [essential facilities].
The objective of this standard is to create an unrestrained ceiling.
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Seismic Code Compliance
“Old” and “New” Code Comparison:
Seismic Design Categories D, E, and F
IBC
Category
D, E, F
CISCA
Zone
Installation Requirement
3-4
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To be installed to CISCA recommendations for areas subject to severe
seismic activity. IBC categories D, E, and F must also meet these
additional requirements:
Minimum 2” wall molding
Grid must be attached to two adjacent walls – opposite walls must have
a ¾” clearance
Ends of main beams and cross tees must be tied together to prevent their
spreading
Perimeter support wires
Heavy-duty grid system
Ceiling areas over 1,000 SF must have horizontal restraint wire or rigid
bracing
Ceiling areas over 2,500 SF must have seismic separation joints or full
height partitions
Ceilings without rigid bracing must have 2” oversized trim rings for sprinklers
and other partitions
Changes in ceiling plane must have positive bracing
Cable trays and electrical conduits must be independently supported and
braced
Suspended ceilings will be subject to special inspection
This practice creates a restrained ceiling.
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Alternative Designs and Methods
Code officials may approve other
installation designs based upon the following:
 IBC Section 104.11 Alternative materials, design and
methods of construction and equipment. The
provisions are not intended to prevent the installation of
any material … providing that alternatives are
approved.
 IBC Section 101.11.1 Tests. Whenever code
compliance is questionable … the building official can
require tests as evidence of compliance.
Armstrong has conducted 70 full scale seismic tests.
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Alternative Designs and Methods
IBC Seismic Design Category D, E, F
Alternative Installation Test:
 Tested Prelude XL with heavy-duty main beams
[7301] and cross tees [XL7348 and XL7328]. The
system was installed according to CISCA guidelines for
seismic restraint, and the IBC, with the following
exceptions:
1. Used 7/8” wall molding [7800] instead of 2” wall
molding
2. Used 2” BERC clips [BERC2] and eliminated the
need for stabilizer bars
 This test verified that the system meets code
performance requirements.
The result: a more efficient installation – labor saving benefits.
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BERC2 Cost Savings
The BERC2 eliminates the expense of stabilizer
bars on the two unattached walls. The #7800 is
substituted for the more expensive 2” molding.
This comparison is based on a Prelude 2’ x 2’ installation. Cost reflects April 1, 2004 pricing.
Total savings with BERC2: 30%, or $ .116/LF.
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Alternative Designs and Methods
IBC Seismic Design Category C
Alternative Installation Test:
 Tested Prelude XL intermediate-duty main beams
[7300] and cross tees [XL7342 and XL7328] and 7/8”
wall molding. The system was installed according to
the IBC Category C with the following exceptions:
1. Used BERC clip to eliminate stabilizer bars.
2. Installed grid tight to two adjacent walls - and less
than ¼” clearance on the opposite walls.
 Verified that the system meets required code
performance.
The result: a ceiling that is easier to square at the perimeter.
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BERC Cost Savings
The BERC creates a tighter overall grid
installation, more efficient squaring of grid,
and easier plenum access at the perimeter.
Savings calculation: BERC2 only placed at cut cross tees [3/4 of the perimeter] = $ .098 x ¾ = $ .074
This comparison is based on a Prelude 2’ x 2’ installation. Cost reflects April 1, 2004 pricing.
Total savings with BERC Solution: $ .103/LF.
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BERC2 Cost Savings
Two Approaches to IBC Categories D, E, F
IBC
Requirements
Armstrong
BERC2 Solution
Solution
Benefits
2” molding
7/8” molding
Narrow, sleek aesthetic with standard 7/8”
wall molding
Attached grid on two adjacent
walls [pop rivets are acceptable]
Attached grid on two adjacent walls
with the BERC2. NOTE: Attaching
the BERC2 clip to the wall secures
the grid and eliminates the need for
pop rivets through the visible part
of the wall molding
Eliminates installation and aesthetic
problems associates with 2” wall molding
¾” clearance at perimeter on
unattached ends
BERC2 clip with ¾” clearance on
unattached ends
BERC2 eliminates visible
Stabilizer bars to prevent the
spread of main beams and cross
tees
BERC2 clip on all four walls
1.
1.
Heavy-duty grid
1.
Heavy-duty grid
2.
Lateral bracing
2.
Lateral bracing
3.
Perimeter support wire
3.
Perimeter support wire
pop rivets through the wall angle
2.
3.
4.
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New 2” BERC clip
Eliminates time and expense to
install pop rivets
Eliminates stabilizer bars
Lower cost solution
Better access to the plenum
Meets code requirement
Additional Armstrong Testing
We’ve also tested “specialty” and “floating” systems!
 Performed extensive testing on
standard, specialty and floating
ceiling solutions
 Testing was performed at the
State University of New York at
Buffalo – Armstrong a premier
Multidisciplinary Center for
Earthquake Engineering
Research [MCEER] partner
Shake Table Test - Infusions
 Architects can specify and code officials approve nonstandard ceilings confident that they have been tested to
meet IBC requirements [Serpentina, Infusions, Axiom,
WoodWorks and MetalWorks]!
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New Seismic Sales Aids
CS-3543 “Seismic Installations: What You Need to Know”
Key brochure messages:
1. Rationale for the
development of the new IBC
code
2. Reference to sections of the
code that allow “alternative
methods”
3. Side-by-side comparison
between IBC requirements
and BERC2 solution
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New Seismic Sales Aids
CS-3559 “Seismic Ceiling Installations”
Key brochure messages:
1. Don’t compromise your
design intent [architect] with
the use of 2” wall molding
2. Armstrong has demonstrated
seismic performance with
extensive testing on many
systems
3. We provide specs, drawings,
and continued education on
the web
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Other Seismic Support Tools
For More Seismic Information on the Web:
www.armstrong.com/seismic
 Latest product and
solution news
 Seismic Test
Summaries
 Seismic Design
Solution CAD
renderings
 Seismic FAQs
 IBC Guide
Specification
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Seismic National Advertising
You’ll see ads in industry
periodicals such as Walls
& Ceilings and AWCI’s
Construction Dimensions
this Spring.
Note reference to the
web address specifically
dedicated to Seismic
information.
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What About Specifications?
Seismic Information in Construction Documents
Here’s what you need to look for:
1. A Seismic Design Category
[SDC] tells the construction team
what level of performance the
building and its systems must
achieve
2. SDC is to be listed in the
construction documents
3. While exact location in the CDs might vary by
jurisdiction, most likely it will be in the general conditions
section of the specification, and in general notes on the
first page of structural drawings
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Additional Resources and References
TechLine Can Provide Assistance!
1. The 2004 catalog references Seismic
performance [note the new icons].
2. Need guide specs, samples, or additional technical
assistance? We can help you and your customers meet
Seismic code requirements. Call TechLine for all your
Seismic needs.
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