FLORIDA BUILDING
COMMISSION
Structural Technical Advisory Committee
Concurrent with
Building Code Administration Technical Advisory Committee
(Code Admin TAC)
Minutes
Phone call in number: 888-808-6959
Conference call code: 1967168
November 29, 2010
9:00 A.M. – 9:50 A.M.
Public point of access: Room 210L
Department of Community Affairs
Building Codes and Standards
2555 Shumard Oak Boulevard
Tallahassee, Florida 32399-2100
(850)-487-1824
Ø Considered Regular Procedural
Issues: Approval of Agenda and Previous Meetings Minutes
Ø Considered Declaratory Statements
Ø Considered Committee and Public Comments
Structural TAC members
present……………………………… Jim Schock,
Chairman
Craig Parrino, C.W. Macomber,
Jack Glenn, Dan Lavrich, Do Kim, Jaime Gascon.
1. Called to
Order-reviewed/approved agenda.
2. Reviewed and provided
recommendations to the Commission on the requests for declaratory
statement:
DCA10-DEC-217 by Dwight Wilkes
This item was taken up
concurrently with the Code Administration TAC
Question: Does the Florida Building Code
allow the Manufacturer through engineering practice to submit additional
information that will allow the substitution
of anchors and installation into different substrates for a product submitted
using the Certification Method and using AAMA 506-06.
Answer: Yes, Section 1714.5.4.1 of the
Florida Building Code, Building, allows substitute anchoring systems for
different substrates using rational engineering analysis "accepted
engineering practice". As long as the spacing has not been changed or
altered from the original test.
3. These items were taken up by the
Structural TAC Only
a. DCA10-DEC-209 by Michael Murray
of Stormwatch, Inc., Staff Analysis
Question #. 1. Is 1613.1.9 intended to mitigate fatigue failure, “entering the plastic
range”, of metal storm shutters and/or metal shutter supporting structures and
components
By limiting the deflection to 2” based on a length to
deflection formula of L/30?
Answer:
Section 1613.1.9, Item (9), applies to all storm shutters regardless of the
products’ materials or physical properties.
Question #.
2. Has it been determined that
“Fabric Storm Panels” or fabric shutters have a “plastic range” or that they
suffer from fatigue failure induced by deflections greater than 2” based on a
length to deflection formula of L/30 or any other?
Answer: Not possible.
Determination of specific product strength and material is subject to
testing and evaluation as determined through the product approval process.
Question
#. 3. 1613.1.9 Specifically and only refers to a minimum separation
from the glass. Has it been determined that openings or areas that have no
glass are subject to 1613.1.9?
Answer: Section 1613.1.9, Item (9), is applicable to an
opening regardless of whether it is a glazed opening or not.
Question #. 4. The language of 1613.1.9 specifically requires a storm shutter to be
installed in such a manner that after maximum permissible deflection the
shutter would have a separation from the glass within the precise range of 1-2”
from the glass. Will storm shutters be required to be installed to deflect into
this narrow range of Separation? Will storm shutters be permitted to be more than
2” from the glass after maximum deflection?
Answer: Will storm shutters be required to be installed to
deflect into this narrow range of separation?
Answer: Storm
shutters must provide a minimum clear separation from the glass a minimum of 1
inch and the deflection limit of the shutter fabric must not exceed 2 inches.
Will storm shutters be permitted to be more than 2”
from the glass after maximum deflection?
Answer is
“Yes” as long as the deflection limit of the product does not exceed 2 inches.
Question #. 5. The relationship between L/30 and the 2” deflection
limit is not directly indicated as a requirement by the language of 1613.1.9,
but inferred from the language. Statements have been made in POC meetings that
what is in the code is the rule and no interpretation as to intent of the rule
can be allowed. Is it not the case that the relationship between the 2”
deflection and L/30 is in itself an interpretation to clarify the intent of the
rule, and if the rule can be interpreted to clarify intent to one end, it can
be interpreted to clarify the intent to another end, such that 1613.1.9 is only
intended to apply to metal shutters preventing excessive deflection which would
lead to fatigue failure and being that fabric storm panels and some other
shutter types that are designed to bend and do not suffer from deflection
induced fatigue failure would not be subject to 1613.1.9 and be exempt from
L/30?
Answer: See
answer to Question #1.
Question #. 6. Florida
Statute 553.842 provides that manufactures have the option of receiving a state
or local approval. If 1613.1.9 is intended to prevent deflection induced
fatigue failure of metal components and the code section continues to be
applied to products that are not subject to this type of failure how are
manufacturers guaranteed a means other than a local approval to demonstrate
compliance within the HVHZ?
Answer: See answer to
Question #1.
b. DCA10-DEC-219 by David Karins of Karins Engineering Inc. (Amendment) ,Staff Analysis
Question #. 1: Does
the deflection and L/30 apply to positive pressures only or does L/30 apply to
negative pressure as well?
Answer: The
deflection and L/30 apply to both positive and negative pressure.
Question #2: Does the deflection criteria and L/30 apply to
flexible materials such as shutters fabricated from screen materials unlike a
rigid material such as plastic or aluminum?
Answer: Yes,
Section 1613.1.9, Item (9), applies to all storm shutters regardless of the
products’ materials or physical properties.
Question #. 3: How
is the L/30 deflection limit applied? Does it apply to overall system or to
individual components?
Answer:
As per Section 1613.1, the L/30 deflection limit applies to both “system” and
component.
Question #4: Does the L/30 apply to two-way systems or one-way
systems?
Answer:
The L/30 applies to both systems “one-way and two-way systems”.
Question #5: If the clear separation of the glass is limited to maximum of 2 inch
(negative pressure) and a minimum of 1 inch (positive pressure), does this mean
the system can only deflect a maximum of ½ inch in each direction with the
system being placed at 1-1/2 inch away from the glass?
Answer: No, the clear
separation must be a minimum of 1 inch and the deflection limit of the shutter
“fabric” must not exceed 2 inches...
c. DCA10-DEC-220, DCA10-DEC-221, DCA10-DEC-222, DCA10-DEC-224, DCA10-DEC-225 by John Kampmann of MEA Engineers Inc.
Question #.
1: Does L/30 apply to fabric
shutters? Fabrics do not have a loss of performance with deflections. It is my
understanding that L/30 only applies to rigid materials.
Answer: Yes,
Section 1613.1.9, Item (9), applies to all storm shutters regardless of the
products’ materials or physical properties.
Question #.
2: Under what circumstances would
this product be able to get a FL Approval for HVHZ? Would this project be able
to get an HVHZ approval for installations that limited its use for NON-GLAZING
installations, such as on the exterior of non-glazed lanais, vents, doors -
including garage doors, and any other non-glazing installations?
Answer: Section
1613.1.9, Item (9), is applicable to an opening regardless of whether it is a
glazed opening or not.
Question #.
3. Would this product be able to be
considered as part of a panel wall system, providing impact protection while
maintaining a separation between this product and the panel wall system?
Answer: Not possible. The question is outside the scope of
the product in question.
Question #.
4: Could this product be considered
as a structural component for use in the HVHZ?
Answer: Not
possible. The question is outside the scope of the product in question.
Question #. 5:
Can this product be installed in the HVHZ and protect glazing as long as the
deflection of the fabric exceeds a separation to glazing of 1 inch?
Answer: See
answer to Question #1.
Question #. 6:
Please clarify the language in 1613.1.9: "...shall provide a minimum clear
separation from the glass of 1 inch (25mm) but not to exceed 2 inches (51mm)
when the shutter or awning is at its maximum point of permissible deflection...
" Specifically, what is the required separation to glass, including any
limitations such as maximum deflection. The language in 1613.1.9 says that the
separation to glass must be between 1 and 2 inches when at its maximum
permissible deflection. The 2 inches is mentioned relative to clear separation,
not relative to deflection as written. Some have said that there is a maximum 2
inch deflection limit, but I have not found that language in the code. If that
is an interpretation of 1613.1.9, please explain it, the words do not support
that definition to me.
Answer: Not possible. No specific question provided.
Question #. 7: In
1613.1.9, is the maximum deflection L/30?
Answer: Yes,
if the opening is not a glazed opening.
Question #.
8: Is it also another fixed amount
regardless of the span, such as 2 inches? If so, where in the code is this
written?
Answer: According to 1613.1.9, Maximum
deflection is L/30 but not to exceed 2 inches if the opening is a glazed
opening.
4. Adjourned
at 9:50 am.
Note:
This document is available to any person requiring materials in alternate
format upon request. Contact the Department of Community Affairs, 2555 Shumard
Oak Boulevard, Tallahassee, Florida, 32399-2100 or call
850-487-1824
This Document prepared by DCA
Joe Bigelow – mailto:joe.bigelow@dca.state.fl.us 850-922-9160
Manager – Mo Madani – mailto:mo.madani@dca.state.fl.us850-921-2247