24.02.2017 Views

Structural Concrete - Hassoun

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

856 Chapter 20 Seismic Design of Reinforced <strong>Concrete</strong> Structures<br />

Length l 0 shall not be less than the largest of the three items listed below or<br />

⎧1<br />

of clear length of member<br />

⎪6 l 0 ≥ ⎨Maximum cross-section dimension of member<br />

(20.61)<br />

⎪<br />

⎩18 in<br />

The first hoop should be located a at distance ≤ s 0 /2 from the joint face. Outside the length l 0 ,<br />

spacing s 0 should confirm to ACI Code, Section 10.7.6 and Section 9.7.6.2.2 or<br />

s 0 ≤<br />

{ d<br />

2<br />

24 in.<br />

(20.62)<br />

REFERENCES<br />

1. American <strong>Concrete</strong> Institute (ACI). Building Code Requirements for <strong>Structural</strong> <strong>Concrete</strong>. ACI Code<br />

318-14. ACI, Detroit, MI, 2014.<br />

2. International Code Council (ICC). International Building Code 2012. ICC, Country Club Hills, IL, 2012.<br />

3. S. K. Ghosh and A. D. Fanella. Seismic and Wind Design of <strong>Concrete</strong> Buildings. 2000 IBC, ASCE 7-98,<br />

ACI 318-99. International Code Council, Country Club Hills, IL, 2003.<br />

4. S. K. Ghosh, A. W. Domel, Jr., and A. D. Fanella. Design of <strong>Concrete</strong> Buildings for Earthquake and Wind<br />

Forces, 2nd ed. Portland Cement Association, Skokie, IL, 1995.<br />

5. Portland Cement Association (PCA). Notes on ACI 318-02 Building Code Requirements for <strong>Structural</strong><br />

<strong>Concrete</strong> with Design Applications. PCA, Skokie, IL, 2002.<br />

6. Minimum Design Loads for Buildings and other Structures. ASCE 7-10. ASCE, Reston, VA, American<br />

Society of Civil Engineering (ASCE). 2010.<br />

PROBLEMS<br />

20.1 Determine seismic design category for a five-story building in the area of northern California if the soil<br />

is hard rock.<br />

20.2 Determine base shear for a two-story building located in the area of high seismic risk where S S = 1.3 g<br />

and S 1 = 0.6 g, on soil class B. Assume that the idealized weight of the first floor is 50 Kip and of the<br />

second floor is 60 Kip.<br />

20.3 Determine lateral seismic forces for the five-story building assuming that the idealized mass of each floor<br />

is 1000 Kip. Consider the structure a building risk category III, site class C.<br />

20.4 Design the longitudinal reinforcement for the beam on the second floor of a special moment-frame<br />

four-story building assuming the clear span of a beam is 24 ft. Each story height is 12 ft. Beam dimensions<br />

are 20 × 24 in., and the column is 24 × 24 in. Bending moments acting on the beam are given in<br />

the following table.<br />

Load Location Bending Moment (kip ⋅ ft)<br />

Dead Support −70<br />

Midspan 45<br />

Live Support 25<br />

Midspan 18<br />

Earthquake Support ±180<br />

Midspan 0

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!