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8/13/2019 4-Lecture 2a - October 1st, 2013
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STR654Inspection, Repair, and
Maintenance of Steel StructuresLecture 2a, October 1st, 2013
Sherif A. Mourad
Professor of Steel Structures and Bridges
Faculty of Engineering,
Cairo University
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TOPICS
Responsibility of each party.Shop Fabrication.
Dimensional tolerance in
fabrication.
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Parties Involved Owner
Designer
Contractor: Fabricator.
Erector. Site supervisor.
Third-Party Inspector.
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Design Responsibility
Owner-Designer-Contractor: Designer to provide design & specs. Contractor to check & advise
problems.
Contractor to build.
Owner-Contractor: Contractor to design and build.
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SHOP FABRICATIONIdentification of material.
Preparation of material.Fitting and fastening.
Fabrication tolerance.
Shop cleaning and painting.Marking and shipping.
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REFERENCE CODE
Egyptian Code of Practice for SteelConstruction and Bridges. Code
No. 205, Ministerial decree 279-
2001.Chapter 12: Dimensional Tolerance.
Chapter 13: Fabrication, Erectionand Finishing Works.
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IDENTIFICATION OF
MATERIALS
Mill certificate.
Additional testing.Identify materials ordered to
special requirements
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PREPARATION OF
MATERIALS
Thermal cutting:
Hand guided.Mechanically-guided
Achieving specified roughnessheight.
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FITTING AND FASTENING
Welding.
Backing bars/tab clean-up.Weld inspection.
Trial fitting of assembly.
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FABRICATION TOLERANCE
Deflection of column between
points which will be laterally
restrained on completion of
erection.
fh1=
0.001 h11.fh1= 0.002 h11 for hollow X-sec.
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FABRICATION TOLERANCE
Deflection of column between
floor slabs.
fh=
0.001 h1.fh= 0.002 h1 for hollow X-sec.
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FABRICATION TOLERANCE
Lateral deflection of compression
flange of girder, relative to the weakaxis, between points which will be
laterally restrained on completion oferection
f11= 0.001 lb.
f11
= 0.002 lb
for hollow X-sec.
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FABRICATION TOLERANCE
Lateral deflection of girder
f1= 0.001 lb.
f1= 0.002 lb for hollow X-sec.
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FABRICATION TOLERANCE
Maximum bow of web for girders
and columns (depth of web hw,
width of flange b)
fw= hw/150
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FABRICATION TOLERANCE
Inclination of web between upper
and lower flanges
vw= hw/75
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FABRICATION TOLERANCE
Eccentricity of the web in
relation to the center of either
flange.
vw1= b/40 10 mm
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FABRICATION TOLERANCE
Position deviation of parts
connected to a girder or column,
e.g., cover plate, base plate etc.
e1= 7 mm in any direction.
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FABRICATION TOLERANCE
Position deviation of end plates of
girders.
e1= 5 mm in any direction.
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FABRICATION TOLERANCE
Length of prefabricated
components to be fitted between
other components.
lt, hc= + 0 or 5 mm.
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FABRICATION TOLERANCE Maximum bow of web for
plate girders with intermediatestiffeners (depth of web d,
thickness of web tw).
fw= (least of d or d1)/115
for d/tw
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FABRICATION TOLERANCE
Flanges of plate girders.
C/250 6 mm.
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FABRICATION TOLERANCE
Unevenness of plates in thecase of contact bearing surfaces:
One mm over a gauge length of300 mm.