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CAESAR II Users Guide

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CAESAR II
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CAESAR II Version
12

Specifies the name of the spectrum. Names should reflect the spectrum and its intended use. This name is used when defining the load cases. The name can be any 24-character identifier and is associated with a spectrum or load profile.

Do not include spaces in the name.

The following predefined spectra are delivered with the software. No additional definitions are required when using these spectra.

El Centro

The El Centro California N-S component, taken from Biggs, "Introduction to Structural Dynamics," applies to systems with 5-10 percent critical damping.

REG. GUIDE 1.60

1.60H.5 and 1.60V.5

1.60H2 and 1.60V2

1.60H5 and 1.60V5

1.60H7 and 1.60V7

1.60H1.0 and 1.60V10

Each of these spectra defines the horizontal and vertical components for 0.5, 2, 5, 7, and 10 percent critically damped systems. Associated with each of these spectra is a value for ZPA. (Zero Period Acceleration), the maximum ground acceleration at the site. This value defaults to 0.5 g and can be changed on the Control Parameters Tab.

Uniform Building Code

UBCSOIL1

UBCSOIL2

UBCSOIL3

These spectra represent the normalized (horizontal) response spectra for three soil types provided in Figure 23-3 of the Uniform Building Code, (1991 Edition).

  • The spectrum name (or load profile) can be preceded by a (#) sign. The (#) sign instructs CAESAR II to read the spectrum table from a file having the same name as the spectrum with no extension. Several jobs in the current folder can then access this shock data.

    The software uses a flat ASCII text file for the data. Arrange data in two columns separated by one or more spaces. For information on editing ASCII text, see ASCII Text File Rules.

  • If data is to be entered manually, click Enter/Edit Spectrum Data , then create new rows and enter the appropriate Range Type and Ordinate Type values. For more information, see Enter/Edit Spectrum Data.

  • The complete definition of a shock includes its name, range type, ordinate type, range interpolation method, ordinate interpolation method, and the shock data point table. Everything but the shock data point table can be entered on the