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Building Design and Construction Handbook - Merritt - Ventech!

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STRUCTURAL THEORY 5.169<br />

TABLE 5.10 Seismic <strong>Design</strong> Category Based on Short Period Response Accelerations<br />

Value of S DS<br />

SDS � 0.167g<br />

0.167g � SDS � 0.33g<br />

0.33g � SDS � 0.50g<br />

0.50g � SDS A<br />

B<br />

C<br />

D<br />

Seismic Use Group<br />

I II III<br />

TABLE 5.11 Seismic <strong>Design</strong> Category Based on 1 Second Period Response Acceleration<br />

Value of S DI<br />

SDI � 0.067g<br />

0.067g � SDI � 0.133g<br />

0.133g � SDI � 0.20g<br />

0.20g � SDI A<br />

B<br />

C<br />

D<br />

A<br />

B<br />

C<br />

D<br />

Seismic Use Group<br />

A<br />

C<br />

D<br />

D<br />

I II III<br />

Where E m equals the earthquake force where seismic forces <strong>and</strong> dead loads counteract.<br />

• All parts of the structure between separation joints shall be interconnected, <strong>and</strong><br />

the connections shall be capable of transmitting the seismic force induced in the<br />

connection by the parts being connected. Any smaller portion of the structure<br />

shall be tied to the remainder of the structure with 5% the weight of the smaller<br />

portion. A positive connection for resisting horizontal forces acting on the member<br />

shall be provided for each beam, girder, or truss to its support. The connection<br />

shall have strength sufficient to resist 5% of the dead <strong>and</strong> live load vertical reaction<br />

applied horizontally.<br />

Analysis Procedures for Seismic <strong>Design</strong> Categories B, C, D, E, <strong>and</strong> F. For Seismic<br />

<strong>Design</strong> Categories B <strong>and</strong> C, IBC 2000 proposed equivalent lateral-load force<br />

procedure shall be used. A more rigorous analysis is permitted, too. However, for<br />

Seismic <strong>Design</strong> Categories D, E, <strong>and</strong> F, the analysis procedures are identified in<br />

Table 5.14.<br />

5.19.2 <strong>Design</strong> Spectral Response Accelerations<br />

Ground motion accelerations, represented by response spectra <strong>and</strong> coefficients derived<br />

from these spectra, shall be determined in accordance with the general procedure<br />

or the site-specific procedure. The later procedure shall be used for structures<br />

on sites classified as Site Class F.<br />

General Procedure for Determining Maximum Considered Earthquake <strong>and</strong> <strong>Design</strong><br />

Spectral Response Accelerations. The maximum considered earthquake<br />

spectral response accelerations maps only provide values for Site Class B at short<br />

A<br />

B<br />

C<br />

D<br />

A<br />

C<br />

D<br />

D

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