Project Summary
The building used here has been adopted (and modified) from Simplified Design of Building Structures, Third Edition, by J. Ambrose.
The plan, elevation, and some proposed details about your single-story, flat-roof, rectangular building are given below. This building is a modest-size building that is commonly used in commercial "strip" mall complexes. The permanent features of these buildings are generally limited to the building shell, (roof, exterior walls, and slab-on-grade floor), to permit easy manipulation and subdivision of the interior space according to needs of the various building occupants. One long side of the building serves as the front with numerous large window expanses, multiple door openings, and a short cantilevered canopy.
A parapet wall - the perimeter wall above the roof surface - is used to produce an even height roofline as seen from the street, even though the roof surface is sloped to the rear of the building at a ¼" per foot. Because of this roof slope, the top of the ledger varies from the building's front to back. This variation, which you must determine, is a function of your building width - given as dimension "b" in the general plan below. Most likely, parapet scuppers and vertical wall leaders will be located along the building rear to move the water off of the roof surface.
General Building Plan
Building Section
The all-wood roof system, shown in the partial roof plan below, is a panelized structure utilizing:
- plywood or OSB panels spanning over
- 2' o.c. stiffeners (also known as sub-purlins) which are supported by
- 8' o.c. purlins (also known as joists) that are supported by
- large girders located at approximately 25' intervals.
Partial Roof Framing Plan
Plan Dimensions
The walls will be constructed from standard concrete masonry reinforced with both vertical and horizontal steel rebar.
Detail A/B is an architectural rendering of typical front wall condition. The girder, pilaster, and widened footing are seen in the background. Detail B is the foundation edge at the front. Dowels, (not shown), extend from the foundation into the masonry wall above.
Detail A/B
Detail C shows the roof edge condition at the building ends with the wood ledger supporting the purlins and transferring lateral loads from the diaphragm into the wall.
Detail C/D
Detail E/F shows the form of a typical beam support at an interior pipe column. Detail F shows the column base detail using a footing and a short pier with the floor slab separately developed.
Detail E/F
