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David A. Fanella's SDCB Seismic Detailing of Concrete Buildings PDF

By David A. Fanella

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Extra info for SDCB Seismic Detailing of Concrete Buildings

Sample text

4(a) are not required if it can be shown by analysis that a beam has adequate lateral stability. Itispermitted to use two intersecting groups of diago¬ nally placed bars symmetrical about the midspan for coupling beams with a clear span to effective depth ratio less than 4. Experiments have shown that diagonal rein¬ forcement is effective only if tire bars can be placed with a large inclination. 28 Two intersecting groups of diagonally placed bars symmetrical about the midspan are required for beams with clear span to effective depth ratios less than 2 and relatively large design shear forces.

13 Mru ] 1 Mn,i\ ] 3 1 / Mn or Mp Mn r > Mn r/3 > (max. 3 at both ends Figure 32 - Transverse Reinforcement Requirements for Beams 59 3 3 3 3 3 3 3 3 3 l ] Table 29 - Transverse Reinforcement Requirements for Columns j 3 ] 3 o 3 ] 3 3 3 0 3 3 0 3 0 3 3 3 Sect. No. Maximum tie spacing shall not exceed s0 over a length £0 measured from each joint face. Spacing s0 shall not exceed the smallest of: • 8 x diameter of smallest longitudinal bar • 24 x diameter of tie bar • Minimum member dimension/2 • 12 in.

The required amounts of vertical and horizontal web reinforcement depend on the magnitude of the design shear force V„: • For Vu 2AcvJf£, two curtains of reinforcement must be provided. 4. 3 s < 18" / reinf.

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SDCB Seismic Detailing of Concrete Buildings by David A. Fanella

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