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PRE-ENGINEERED BUILDINGS
 
GENERAL
(A) Definition-
The building, as specified herein, consists of columns, rafters, bracing, connection clips, roof purlins, wall girts, roof and wall sheeting, anchor bolts, flashing, trims, etc., or as specified. All materials shall be new and free from defects.
1.
The main building structure comprises of single or multiple gable interior rigid frames with either rigid or Ò post- and beam" frames at the enwalls.
2.
The standard roof slopes are 0.5 or 1.0 unit of vertical rise to 10 units of horizontal run. Other slopes are available upon request.
3.
The sidewall steel line is the plane of the inside vertical surface of the sidewall sheeting. It is also the plane of the out side vertical surface of the eave strut.
4.
The end wall steel line is the plane of the inside vertical surface of the end wall sheeting. It is also the plane of the out side vertical surface of the outer flange of the end wall girts.
5.
The building width is the distance between the steel lines of opposite sidewalls. Building width does not include the width of Lean-To buildings or roof extensions.
The width of a Lean-To building is the distance from the steel line of the exterior sidewall of the Lean-To building to the (sidewall or endwall) steel line of the main building to which the Lean-To building is attached.
6.
The building length is the distance between the steel lines of opposite end walls. Building length is a combination of several bay lengths. Building length does not include the width of endwall Lean-To buildings or roof extensions.
7.
End bay length is the distance from the outside of the outer flange of endwall columns to the center line of the first interior frame.
8
Interior bay length is the distance between the center lines of two adjacent interior rigid frame columns.
9.
The building eave height is the distance from finished floor level (FFL) to the top of the eave strut at the sidewall steel line.
10.
The building clear height is the distance from finished floor level (FFL) to the bottom of the end plate of the rafter at the knee.
 
(B) Standard Structural Framing Systems-
 
1.
Clear Span (CS) buildings have a gable roof with vertical sidewalls and endwalls. Interior bay frames are clear span rigid frames without interior columns.
2.
Multi-Span (MS) buildings have a gable roof with vertical sidewalls and endwalls. Interior bay frames are rigid frames typically having tapered exterior columns, tapered rafters and square tube or built-up interior columns.
3.
Space Saver (SV) buildings have a gable roof with vertical sidewalls and end walls. Interior bay frames are clear span rafters typically with horizontal bottom flanges.
4.
Lean-To (LT) buildings consist of outer sidewall columns and simple span rafters attached to the sidewall columns or the end wall posts of the main building. Lean-To columns are of constant depth. Lean-To rafters may be tapered or of constant depth.
5.
Multi-Gable (MG) buildings have a roof with two or more gables and vertical sidewalls and end walls. Interior bay frames are rigid frames typically having tapered exterior columns, tapered rafters and built-up interior columns.
 
(C) Standard Framing Features-
 
1.
Main frames are typically constructed from tapered or constant depth columns and rafters.
2.
Rigid frames for Clear Span (CS) and Multi-Span (MS) buildings are most commonly spaced from 6000 mm to 10000 mm, center line to center line.
3.
Outside flanges of Clear Span (CS) and Multi-Span (MS) rigid frame columns are inset 200 mm from the sidewall steel line to allow for by-pass girts.
4.
Outside flanges of Space Saver (SV) rigid frame columns shall be placed flush with the sidewall steel line.
5.
1.3.5 The top flanges of all rigid frame rafters are 200 mm below the bottom of the roof sheeting.
6.
End frames are Ò post-and-beam" (P&B) load bearing frames with end wall girts flush framed into the webs of the end wall posts so that the outer flanges of the girts are in the same vertical plane as the outer flanges of the posts. Optional rigid frames may be used at the building ends. The center line of the endwall rigid frame shall be 385 mm from the end wall steel line.
7.
Endwall posts are typically spaced at 6000 mm. Depending on he width of the building and endwall openings, other spacing may also be used. When the building width is not evenly divisible by 6000 mm, the interior spacing of the endwall posts is typically kept at 6000 mm with two equal end spacing smaller or larger than 6000 mm.
8.
For Clear Span (CS) and Multi-Span (MS) buildings, the dewall girts are attached (by-passed) to the outer flanges of exterior columns. Sidewall girts are lapped at all interior frames. For Space Saver (SV) and Lean-To (LT) buildings, the sidewall girts are flush connected (flush framed) so that the outer flange of the girt is in the same vertical plane as the outer flange of the exterior columns.
9.
The bottom flanges of roof purlins are attached to the outer (top) flanges of the rafters. Purlins are lapped at all interior frames in all structural framing systems.