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Structural Concrete - Hassoun

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722 Chapter 18 Stairs<br />

18.4.2. Section 18.3<br />

Design examples are presented in this section.<br />

REFERENCES<br />

1. V. A. Morgan, “Comparison of Analyses of Helical Stairs.” <strong>Concrete</strong> and Constructional Engineering,<br />

London (March 1960): 127–132.<br />

2. A. C. Scordelis, “Internal Forces in Uniformly Loaded Helicoidal Girders.” Journal of the American <strong>Concrete</strong><br />

Institute (April 1960).<br />

3. A. R. Cusens and Jing-gwo Kuang. “A Simplified Method of Analyzing Free Standing Stairs.” <strong>Concrete</strong><br />

& Constructional Engineering (May 1965): 167–172.<br />

4. A. R. Cusens and Jing-gwo Kuang. “Experimental Study of a Free Standing Staircase.” Journal of the<br />

American <strong>Concrete</strong> Institute (May 1966): 587–603.<br />

5. Franz Sauter. “Free Standing Stairs.” Journal of the American <strong>Concrete</strong> Institute (July 1961): 847–869.<br />

6. Cusens and Santathadapon. Design Charts for Helical Stairs with Fixed Supports. <strong>Concrete</strong> Publications,<br />

London, 1966.<br />

7. A. H. Mattock. “Design and Construction of a Helical Staircase.” <strong>Concrete</strong> & Constructional Engineering<br />

(March 1957): 99–105.<br />

PROBLEMS<br />

18.1 Design a typical flight of the staircase shown in Fig. 18.22, which is a part of a multistory building. The<br />

height between the concrete floors is 10 ft (3.0 m). The stairs are supported at the ends of the landings<br />

and carry a live load equal to 120 psf (5.75 kN/m 2 ); f c ′ = 3ksi (20MPa) and f y = 60 ksi (400 MPa).<br />

Figure 18.22 Problem 18.1.<br />

18.2 Repeat Problem 18.1 if the stairs are supported by four transverse beams at A, B, C, andD and the live<br />

load is increased to 150 psf (7.2 kN/m 2 ).<br />

18.3 The stairs shown in Fig. 18.23 are to be designed for a live load equal to 100 psf (4.8 kN/m). The stairs<br />

are supported by beams, as shown. Design the stairs and the supporting beams for f c ′ = 3ksi (20MPa)<br />

and f y = 60 ksi (400 MPa).

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