AISC DESIGN GUIDE 23
CONSTRUCTABILITY OF STRUCTURAL STEEL BUILDINGS
|Publication Date:||1 January 2008|
The Construction Industry Institute (CII, 1993) defi nes constructability as the optimum use of construction knowledge and experience in planning, design, procurement and fi eld operations to achieve overall project objectives. Those who advocate this concept believe that constructability can bring real benefi ts to all involved-clients, consultants and contractors. Benefi ts include enhanced cooperation, reduced risk, improved schedule, budget control, and elimination of litigation.
Constructability includes visualizing the construction of the project prior to beginning the actual design, and maintaining that vision throughout the design process. The focus is on maximizing simplicity, economy, and speed of construction, while considering such project-specifi c factors as site conditions, code restrictions and owner requirements. Constructability is a design philosophy that begins in the conceptual design stage, continues through design, and links project planning with design and construction.
Constructability can be a challenge. The traditional approach separates the individual functions involved in planning, design, procurement and construction into specifi c tasks-each performed by specifi c parties. Planning is often performed by the architect, with systems design prepared by the engineers. Procurement is managed by the construction manager, and construction is performed by the general contractor and appropriate trades.
The steel industry also follows this traditional process. The structural design is typically separated from the detailing, fabrication and erection, which are also normally separate and distinct functions. The design professional tends to place emphasis on the design, budget, schedule and liability, while the detailer concentrates on shop and erection drawing preparation, and the fabricator and erector separately concentrate on their respective roles in meeting the project schedule and budget. These diverse interests, pitting design versus fabrication versus erection, are not benefi cial to the owner.
Constructability seeks to integrate this process and reap the benefi ts of collaboration. It is an approach that infuses construction knowledge and experience into the design process, creating a project that achieves the overall project objectives while reducing costs, improving the schedule, and eliminating litigation. This will create satisfi ed designers, builders and owners!