TB-Lecture15-Example-Direct-method-for-One-way-Slabs

TB-Lecture15-Example-Direct-method-for-One-way-Slabs - The...

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EGN EGN -5439 The Design of Tall Buildings 5439 The Design of Tall Buildings Lecture #15 Lecture #15 Example of the use of the Direct Method to Calculate the Beams for a One-way Reinforced Concrete Slab © L. A. Prieto-Portar - 2008
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Example. Shown below is a partial plan of a typical floor for a warehouse with a 4.5 inch thick cast-in-place reinforced concrete slab and a floor framed with 16 inch deep wide- module joists and beams. Design the beams for the combined effects of gravity and lateral-wind loads as per ACI 318-02. 32.5 feet
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Cross-section of beam supporting the wide-flange joists.
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Design Data. a) Materials: - 4 ksi concrete; normal weight of 150 pcf; ¾” maximum sized aggregate; - 60 ksi (Grade 60) mild reinforcing steel; b) Loads: - From the wide-module joists (use height = 16” + 4.5”) = 76.6 psf - From the superimposed dead loads (flooring, etc) = 30 psf - From the live load (warehouse / garage) = 100 psf - Wind load (ASCE 7-02)
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End span Interior span
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Unformatted text preview: The reinforcement lengths can be obtained from Figure 8-3 of PCAs Simplified Design of Concrete Buildings of Moderate Height and Height in lieu of using ACIs Section 12.10 through 12.12. Two #5 bars are provided within the center portion of the span to account for any variation in the required bar lengths due to wind effects, although it may be more economical to actually determine the correct lengths. Since the beams are part of the primary lateral-load-resisting system, ACI Section 12.11.2 requires that at least one-fourth of the positive moment reinforcement extend into the support and be anchored to develop f y in tension at the face of the support. References. 1) D. Fanella, Timesaving Design Aids for Reinforced Concrete, Part 1: Beams and One-way Slabs, Structural Engineer, August 2001; 2) PCA, Simplified Design of Concrete Buildings of Moderate Height and Height....
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TB-Lecture15-Example-Direct-method-for-One-way-Slabs - The...

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