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Figure 2.54. Three-story building: comparison of modal story shears and the SRSS story.

Figure 2.54. Three-story building: comparison of modal story shears and the SRSS story.

Figure 2.55. Seven-story building example; dynamic analysis.

Periods.

Spectral Accelerations. From the response spectrum of Fig. 2.56 a, b, and c, the spectral accelerations are

Observe that all three parts of Fig. 2.56 contain the same information related to the acceleration response, Sa. Only the format is different. Figure 2.56a shows the building periods and spectral accelerations in a format similar to that in 1997 UBC and IBC-03. Figure 2.56b is a tripartite response spectrum with additional values for displacements and velocities. Figure 2.56c shows the building periods and response accelerations in tabular format.

It should be noted that in the computer program used for calculation of the

Eigen values, each mode is normalized for a value of £ W f2 = 1.0. In some programs, g *

f is normalized to 1.0 at the uppermost level. Required.

1. Modal analysis to determine base shears.

2. First, second, and third mode forces and displacements.

3. Modal analysis summary.

Spectral acceleration, Sa(g)

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