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Seismic Rx Approaches to zloisira
Category D, E and F installations
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SEISMIC; RX CODE COMPLIANT SOLUTIONS AND BENEFITS (ESR-1308
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PI Narrow, sleek aesthetic with standard 7/8" molding m Attached grid on two adjacent walls with the BERC2 -g.i''I'I'd
Eliininates installation and aesthetic probleillS or pop rivets
associated with 2 wall rpoldina ro BERC2 clip with 3/4" clearance on unattached walls
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Better access to the plenum
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'a Eliminates stabilizer bars ,.....,-,i0,
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M Eliminates visible pop rivets through the wail angle 1
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NBC Approach to Category D 5 E and F installations
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SEISIVOS Rx CODE COM:PLAINT
AMITNIA BERC BERC2 I 8 B 8
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' Tight Wall light Wall B 111 L Meets code requirements
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1 :r,itat4; 1 3 Cross W Narrow, sleek aesthetic with standard
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walls — can use the BERC or BERC2
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1. ESEOUIREMENTS
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overlap of the grid on toe wall molding
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rZ,44::,:l115 Fe complete seismic inslalialion i:erluireMerliS 0:quact TesnLine' ar - I K7 ARMSTRONG.
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THE CASE FOR 'ERE ' =fr.` EP a • ,n , •
In full -scale seismic test evaluations for areas su bject to severe seismic motion. the common cause
of system failure; came from damage to cross tee end connectors ;Armstrong and competitive systems). _ `
Damage occurred in one of two ways: °
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a Connector clip bends ,`<yw '=
wr Base metal bends '-
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l�'l�en this damatle occurs it allows i�nbraced sections of ceiling to move up to 3,'8 at each '� �,'., , 'L;
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connection. F ?�e cunli iative of ect of damage at the cross tee t or3ner inns may move the ceiling
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more than . , F 4
Without perimeter support wires, test results demonstrate that the load of the ceiling may cause -''•y ,
the main beams and cross tees to move beyond the 2' wall molding and drop out. System failure 14
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at the perimeter does not conform to the requirements of the code. 40: G% ;
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UI Da nape at cress tee connections Ur supported cross tees allow panels ;
allows ceiling movement. ' - :
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Potential Movement ``z t ,' 9
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3/4" + 3/8" + 3/8" + 3/8" + 3/8" = 2-1/4 " -' ..:ria
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ti ;�;nv ;- Seismic Separation Joints
,1 -. PURPOSE:: OF SEPARATION JOINTS
•i 1 ASCE 7 Section 13 5.6 2.2 mandates that ceiling areas greater than 2,500 SF must have seismic
0 4;••Z 'if separation joints, closure angles and norizontal restraints. This means 2' molding, perimeter spacer
;:;P�; °''° ,,. bars - and if the area is greater than 1,000 SF lateral force bracing. It is thought Mat these measures
;;;•.t\ will prevent the accumulated forces from overpowering an individual suspension system connection.
., 3 i. This method of failure was observed after some strong California quakes in the 1980s.
<„ The code does not describe now to construct the separation joint, Initially, we responded to inquiries
;_ `: by providing an expansion joint detail fabricated from steel moldings, This type of joint is widely
,i;: r accepted because it is familiar to inspectors and because the width of the separation can
be se: to march whatever the project designer requires. However. many designers find this
method objectionable:
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K;•. ii " Traditional field- fabricated expansion joint details are very noticeable on the ceiling plane
1 The system is not very rigid and the grid system can move 'off module"
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S ..,+�,t C �. SOLUTION
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t,'0413 Armstrong has done full -scale testing which coniir :ris that a ceiling fitted with our Seismic Joint Clip
for Main Beams ;SJMR) and Seismic Joint Clip for Cross Tees (SJCG S SCJSI) performs as well as
` " fix° a field fabricated separation joint. Additional benefits to triese seismic - rested separation joints are:
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,_�, <..� t SCI I' C';..Ia- �.,5r( j; A (SJMR)
,:;,j - >" m Gives architects and designers a clean look (not visible from the floor)
' Saves contractors time with a reliable installation method
: :` -_e Easily installs in minutes at main beam splice
is \ Ap _° Maintains integrity of ceiling module, unlike field assembled alternatives
t' Allows for full acoustical panel at the joint
:e . " 2 Easier to keep the ceiling system square
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SEISMIC JOINT CUP — CROSS TEE i,SJCG & S, CSI)
z Gives architects and designers a clean look (not visible from the floor)
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s Saves contractors time with a reliable installation method " "'
Li Installs in minutes, no need to cut the face of the grid to install clip r -= ,,. - 4,tz°
to Eliminates the need for additional hanger wires
Maintains integrity of the ceiling module, unlike field assembled alternatives ``. i
at Allows the use of full size panels %. „r'A
n Works with our PeakFore grid (Suprafine , Prelude) and square bulb grid ,°, ' 'tt;119
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Separation Joint Layout Details „,, -, ,,,,,,,,
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Beam - Beam Beam • = ``air
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1- -SJMR - -SJMR SJMR - -1 -'SJMR — SJMR-- - 4" Cross I ' SJC - ' SJC
Tee
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-4" Cross Tee -4' Cross Tee 1 SJC
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SJC -- 2 Cross -- 2'Cross � ,���,a =,, '`y
Tee Tee
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Bracing and Restraint for Seismic Installations
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Attachment to the wall is considered restaint. Bracing is a form of restraint (compression post '°'t°°=: - : r; .
and wires).
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Typical seismic bracing for a wail -to -wall ceiling consists of clusters of tour 12 -gage wires arrayed 14
9 ° f� one attached main p., cross tee ct' These ii53 - -� >
. d from o,je �,r�othe! and aftache.l to the m�.i,i beam Within 2' of a c,,,s., ec intersection. Then m 4
wires are to be angled no more than 45° from the plane of the ceiling. The compression post is ,
attached to the grid at the cluster o` wires and extends to the overhead structure (see Figure 1).
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The compression post needs to be engineered for the application and the longer its length the
more substantial it must be. Typical post materials are EMT conduit or steel stud (see Figure 2). ,.'. 1
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' '': The code also allows to the use of rigid bracing. The advantage here is that when a rigid member is
used in place of wires if can handle loads in two directions ;push and /or pull) so only two diagonals
kc,' � \P , and one vertical are needed at each location,
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L>\ ;y — ' f COMPRESSION POST
'` �±',?\ .,, COMPRESSION POST
12 GA HANGER WIRE ,. �
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TIGHT WR APS ) 45° OR LESS IRE 45° OR LESS
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OR LESS
72 GA BRACE WIRES ARMSTRONG �� 5° OR LESS
CROSS TEE- ARMSTRONG
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f ;; _` , is Typical wall-to-mill ceiling restraint is achieved by proximity or attachment to the perimeter angles
I 3, ' 5 ° which are fixed to the walls. Seismic Design Category C allows some movement but limits are
Ci; established by setting the required clearance at 3/8". Seismic Design Categories D, E and F require
=° :_ the ceiling grid to be fixed to the wall molding on two adjacent walls. This attachment to the molding
: —. is the first element of restraint. As the ceiling area gets larger and the mass (or weight) of the ceiling
t` A increases additional restraint must be applied in the form of , :lateral force bracing.:`
Clouds and Canopies
f INSTALLING CLOUDS
>( "\� Armstrong defines a cloud as a ceiling that is not connected to a wall on any side.
f": ; =Y' ° ASCE -7 Design Manual, Section .t 3 states that the design of architectural components and their
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,: ,r,' supports is required to meet minimum values as calculated in Section 13,3.1 for seismic force and
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. ;T Section 13.3.2 for lateral displacement. Ceilings are a line item on the chart associated with these
Ls P calculations. Unless specifically exempted oy the local authority, it should be assumed that a cloud
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(architectural component) comprised (If grid and panels must be restrained. Part of the formula used
4; 2 <,, in these calculations takes seismic design category into consideration, so the minimum force values
10 '' will go down or up as toe seismic risk changes.
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