Transcript STEEL BUILDING EXTERIOR WALL INTERFACE ISSUES

Rocky Mountain Steel
Construction Association
Structural Engineers
Association of Colorado
Structural Engineers Association of
Colorado Steel Liaison Committee
STEEL BUILDING
EXTERIOR WALL
INTERFACE ISSUES
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Past products from SEAC and RMSCA
1. AESS Guidelines – Prepared to
assist in defining finishing and cost
issues associated with AESS Steel
2. Input for the 2005 AISC Code of
Standard Practice
3. Checklist for Structural Design
Drawings
4. Pre-Detailing Meeting
Agenda/Checklist
5. Current project: Improving the
Shop Drawing Process
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ENGINEERING
TOLERANCE
CONSTRUCTABILITY
STEEL BUILDING
EXTERIOR WALL
INTERFACE ISSUES
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consulting structural engineer = EOR
architect = AOR
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STEEL BUILDING EXTERIOR WALL INTERFACE ISSUES
EOR’s primary role(s)
•design team member
•assist the AOR with issues that
involve engineering
•prime design team contact to the
structural steel detailer
•insures the completed structure is
safe and performs as expected
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information gathering
AOR to determine skin type
AOR to coordinate application with
the EOR
EOR to insure structural adequacy at
exterior wall interface
EOR to define connection between
exterior wall and structural frame
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STEEL BUILDING EXTERIOR WALL INTERFACE ISSUES
what is the goal?
produce clear information on
the design documents
assure all parties know who is
responsible for what aspect of the
design
meet with fabricators, erectors and
exterior wall suppliers
insure that the GC understands the
desired final expectations
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illustrate the
eccentricities
for which the
steel frame is
designed
and/or the
eccentricities
for which the
exterior wall
must be
designed
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keeping the
column line
pushed out as
far as possible
could result in
cost savings to
the owner
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check points
if possible, move the column
line outward
understand the exterior wall system
and the desired interface with the
structural frame
meet with fabricators, erectors and
exterior wall suppliers
understand the tolerances involved
with the project
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STEEL BUILDING EXTERIOR WALL INTERFACE ISSUES
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STEEL BUILDING EXTERIOR WALL INTERFACE ISSUES
3 : the allowable deviation from a
standard; especially : the range of
variation permitted in maintaining
a specified dimension
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STEEL BUILDING EXTERIOR WALL INTERFACE ISSUES
3 : the allowable deviation from a
standard; especially : the range of
variation permitted in maintaining
a specified dimension
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STEEL BUILDING EXTERIOR WALL INTERFACE ISSUES
the range of
variation permitted in maintaining
a specified dimension
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owner retains
consultants
contract
documents
progress
general
contractor
is retained
steel and
exterior wall
subs are
secured
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design team
issues DD contract
documents
general contractor
releases DD docs
for bid
design team
issues CD’s
general contractor has
steel sub under contract
design team
issues 100%
CD’s
general contractor
releases steel sub to
proceed with detailing
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steel sub
starts
project
begins
steel
frame
critical
path
steel to be
purchased
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steel
frame
critical
path
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must happen
submittal schedule erection
approval
shop
Sub’s
dwgs
RFI’s
sched
dwgs
of
coordination
design
of
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clear
intent
predictable
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leveling the playing field
preparation
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section 6.4
“fabrication
tolerance”
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camber
sweep
roll steel tolerance
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section 7.5
“installation
of anchor
rods
foundation
bolts and
other
embedded
items”
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section 7.12
“structural
steel frame
tolerance”
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section 7.13
“erection
tolerances”
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section
7.13.2
“in the design of steel structures, the owners
designated representative for design shall
provide for the necessary clearance and
adjustments for material furnished by other
trades to accommodate the mill tolerance,
fabrication tolerances and erection tolerance
as accepted in this Code for the Structural
Steel frame.”
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responsibility
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suggested details
dimensions
and usage of tolerances
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-associated AISC tolerances•section 6.4 fabrication tolerance
•section 7.5 installation of anchor
rods, foundation bolts and other
embedded items
•section 7.12 structural steel frame
tolerances
•section 7.13 erection tolerances
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2005 AISC code of
standard practice
-section 7.12“the accumulation of
the mill tolerance and
the fabrication
tolerances shall not
cause the erection
tolerance to be
exceeded”
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2005 AISC code of
standard practice
-section 7.13“erection tolerances
shall be defined
relative to the member
working points and
working lines”
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the more
understanding the
design team has of the
interface of the
structural frame to the
exterior wall system,
tolerance will become
a useful tool and not a
problem for the
construction team
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fewer
restrictions at
the roof
has or das will
need to be
field installed
appropriate
flange width
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project
success
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•good communications
•heroes are rewarded if proper
attention is given
•review and understand structural
framing system to control cost
•select edge materials that will
perform with the exterior wall
system
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•edge materials that account for
tolerance variations
•clearly show all necessary offset
dimensions on the design
documents
•use the AISC code of standard
practice, ASTM and experiences of
the construction team
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ENGINEERING
TOLERANCE
CONSTRUCTABILITY
STEEL BUILDING
EXTERIOR WALL
INTERFACE ISSUES
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ENGINEERING
TOLERANCE
CONSTRUCTABILITY
STEEL BUILDING
EXTERIOR WALL
INTERFACE ISSUES
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CONSTRUCTABILITY
•brief history of project evolution
•EOR drawing process
•recommendations
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BRIEF HISTORY OF PROJECT
EVOLUTION
PRIOR TO 1950’S
1. ARCHITECT – MASTER BUILDER
2. DRAWINGS – DRAWN IN INK ON LINEN &
VERY DETAILED
3. STRUCTURE INCLUDED IN ARCHITECTURAL
DRAWINGS
4. BUILDING SHAPES – RECTANGULAR, 1-3
STORIES
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BRIEF HISTORY OF PROJECT
EVOLUTION
PRIOR TO 1950’S
5. EXTERIOR MATERIALS – LIMITED TO STONE,
MASONRY, AND PUNCHED WOOD WINDOWS
6. FLOOR AND ROOF SYSTEMS – WOOD OR
CONCRETE
7. GC’S SELF PERFORMED ALL OF THE WORK
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BRIEF HISTORY OF PROJECT
EVOLUTION
1950’S – 1960’S
1. STRUCTURAL SYSTEMS EXPANDED TO
INCLUDE STRUCTURAL STEEL, STEEL
JOISTS AND PRECAST CONCRETE
2. STRUCTURAL DRAWINGS BECAME
SEPARATE DOCUMENTS
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BRIEF HISTORY OF PROJECT
EVOLUTION
1950’S – 1960’S
3. GC’S STARTED BROKERING WORK OUT TO
SUBCONTRACTORS
4. STEEL SHOP DRAWING PREPARATION BY INHOUSE ENGINEERS
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BRIEF HISTORY OF PROJECT
EVOLUTION
1970’S
1. BEGINNING OF MORE COMPLEX EXTERIOR
WALL SYSTEMS
2. DRAWINGS PREPARED ON MYLAR AND PINBAR SYSTEM
3. COMBINATION OF STRUCTURAL AND
EXTERIOR WALL SYSTEMS INCREASED
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BRIEF HISTORY OF PROJECT
EVOLUTION
1980’S
1. ADVENT OF CAD
2. BUILDING COMPLEXITY SKYROCKETS
3. MORE EXTERIOR WALL SYSTEM CHOICES
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BRIEF HISTORY OF PROJECT
EVOLUTION
1980’S
4. GC LOYALTY TO SUBCONTRACTORS
STARTS TO DIMINISH
5. EOR SELECTION SHIFTS FROM
QUALIFICATION TO FEE BASIS
6. STEEL SUBCONTRACTORS START CUTBACK
OF SHOP DRAWING STAFF AND BEGIN TO
OUTSOURCE
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BRIEF HISTORY OF PROJECT
EVOLUTION
1990’S
1. BUILDING SHAPES AND EXTERIOR SKINS
FURTHER EVOLVE INTO UNTESTED
CONSTRUCTION
2. EOR & SUBCONTRACTOR SELECTION
BASED ON LOW DOLLARS
3. “GIVE & TAKE” ATMOSPHERE OF
CONSTRUCTION BEGINS TO ERODE
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BRIEF HISTORY OF PROJECT
EVOLUTION
1990’S
4. GC LOYALTY TO SUBCONTRACTORS IS
RARELY SEEN
5. COMPETITION FOR LOWER COST FORCES
LESSER QUALITY DOCUMENTS
6. TECHNOLOGY EXPLOSION LEAVES
EXPERIENCE ON THE SIDELINE
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BRIEF HISTORY OF PROJECT
EVOLUTION
1990’S
7. COORDINATION OF DOCUMENTS WITH
OTHER TRADES WANES
8. STEEL SUBCONTRACTORS OUTSOURCE
MAJORITY OF SHOP DRAWING
PREPARATION
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BRIEF HISTORY OF PROJECT
EVOLUTION
2000’S
1. SUBCONTRACTOR COMPETITION IS
INTENSE, SO REPEAT WORK IS DIFFICULT TO
OBTAIN
2. TIGHT MARGINS FORCE LESS “GIVE &
TAKE”
3. SHOP DRAWINGS ARE DIFFICULT TO
PREPARE
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BRIEF HISTORY OF PROJECT
EVOLUTION
2000’S
4. LOWER CONSULTANT FEES AND TIGHT
SCHEDULES RESULT IN LESS COMPLETE
DOCUMENTS
5. GC REACTION – CM, NEGOTIATE IN ORDER
TO HELP CONTROL DESIGN & COST
6. ARCHITECTURAL EXPERIENCE LEVEL IN
PREPARING DOCUMENTS DROPS
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BRIEF HISTORY OF PROJECT
EVOLUTION
2000’S
7. TIMELY, BUILDABLE INPUT FROM
ARCHITECT TO SER DROPS OFF RESULTING
IN INCOMPLETE COORDINATION OF
DRAWINGS
8. MIX OF EXTERIOR WALL SYSTEMS
INCREASES
9. EFFECTIVE COMMUNICATION TRADED FOR
EMAIL
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EOR DRAWING PROCESS
1. SCHEMATIC DRAWINGS PROVIDED BY
ARCHITECT TO EOR
2. EOR FRAMES BUILDING
3. TYPICAL EDGE CONDITIONS ARE
DEVELOPED BY EOR BASED ON IDEAS BY
ARCHITECT
4. AS ARCHITECTURAL DRAWINGS DEVELOP,
EOR ADJUSTS STRUCTURAL DOCUMENTS
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RECOMMENDATIONS
1. EOR MUST ASSIST ARCHITECT WITH
CONSTRUCTABILITY ISSUES AS
DOCUMENTS ARE DEVELOPED
2. EOR SHOULD SEEK CONSTRUCTABILITY
INPUT FROM AFFECTED TRADES AS
DOCUMENTS ARE PREPARED
3. FABRICATOR SHOULD IDENTIFY
CONSTRUCTABILITY ISSUES UPFRONT
4. THE GC MUST COORDINATE
CONSTRUCTABILITY ISSUES BETWEEN
TRADES
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RECOMMENDATIONS
1. EOR MUST ASSIST ARCHITECT WITH
CONSTRUCTABILITY ISSUES AS
DOCUMENTS ARE DEVELOPED
2. EOR SHOULD SEEK CONSTRUCTABILITY
INPUT FROM AFFECTED TRADES AS
DOCUMENTS ARE PREPARED
3. FABRICATOR SHOULD IDENTIFY
CONSTRUCTABILITY ISSUES UPFRONT
4. THE GC MUST COORDINATE
CONSTRUCTABILITY ISSUES BETWEEN
TRADES
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RECOMMENDATIONS
5. FABRICATOR MUST PARTICIPATE IN
COORDINATION OF AFFECTED TRADES
6. EOR & ARCHITECT NEED TO ACCOMMODATE
CONSTRUCABILITY ISSUES THAT ARISE
DURING CONSTRUCTION
7. TIMELY PRE-CONSTRUCTION MEETINGS ARE
ESSENTIAL
8. CONSULTANTS MUST GET FIELD
EXPERIENCE
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ENGINEERING
TOLLERANCE
CONSTRUCTABILITY
STEEL BUILDING
EXTERIOR WALL
INTERFACE ISSUES
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ENGINEERING
TOLLERANCE
CONSTRUCTABILITY
STEEL BUILDING
EXTERIOR WALL
INTERFACE ISSUES
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TOLERANCE
CONSTRUCTABILITY
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EXTERIOR WALL
INTERFACE ISSUES
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