Design of reinforced concrete floor systems

Design of reinforced concrete floor systems - Design of...

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PROFESSIONAL DEVELOPMENT SERIES Design of Reinforced Concrete Floor Systems By David A. Fanella, Ph.D., S.E., P.E., and Iyad M. Alsamsam, Ph.D., S.E., P.E.
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R einforced concrete floor systems can provide an economical solution to a wide variety of situations. Numerous types of nonprestressed and prestressed floor systems are available to satisfy virtually any span and loading condition, see Figure 1. Selecting the most effective system for a given set of constraints can be vital to achieving overall economy, especially for low- and mid-rise buildings and for buildings subjected to rela- tively low lateral forces where the cost of the lateral-force-resisting system is minimal. General considerations Concrete, reinforcement, and formwork are the three primary expenses in cast-in-place concrete floor construc- tion to consider throughout the design process, but espe- cially during the initial planning stages. Of these three, formwork comprises about 50 to 60 percent of the total cost and has the greatest influence on the overall cost of the floor system. The cost of the concrete, including placing and finishing, typically accounts for about 25 to 30 percent of the overall cost. The reinforcing steel has the lowest influ- ence on overall cost. To achieve overall economy, designers should satisfy the following three basic principles of formwork economy: Specify readily available standard form sizes. Rarely will custom forms be economical, unless they are required in a quantity that allows for mass production. Repeat sizes and shapes of the concrete members wherever possible. Repetition allows reuse of forms from bay to bay and from floor to floor. Strive for simple formwork. In cast-in-place concrete construction, economy is rarely achieved by reducing quan- tities of materials. For example, varying the depth of a beam 2 PDH Special Advertizing Section Portland Cement Association Continuing Education The Professional Development Series is a unique opportu- nity to earn continuing education credit by reading specially focused, sponsored articles in Structural Engineer . If you read the following article, display your understanding of the stated learning objectives, and follow the simple instructions, you can fulfill a portion of your continuing education requirements at no cost to you. Instructions First, review the learning objectives below, then read the Professional Development Series article. Next complete the quiz and submit your answers to the Professional Development Series sponsor. Submittal instructions are provided on the Reporting Form, which follows the quiz and is also available for download at Your quiz answers will be graded by the Professional Development Series sponsor. If you answer at least 80 percent of the questions correctly, you will receive a certificate of completion from the Professional Development Series sponsor within 90 days and will be awarded 2.0 professional develop- ment hour (equivalent to 0.2 continuing education unit in most states).
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