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API REPORT 80-32 Document Information:
Title
Shaking Table Tests of a Tubular Steel Frame Model
American Petroleum Institute
Publication Date:
Jan 1, 1982
Scope:
1.2 Objectives and Scope
The primary objective of this study was to obtain experimental data on
the seismic behavior of a two dimensional tubular x-braced offshore
frame by means of a shaking table. The test model represented a 5/8
scale model of Popov's Frame I(11); thus, it was a 5/48 scale model of
the Southern California Example Structure used in previous analytical
studies(9,10,12). Because of this similarity, this test can provide
many useful comparisons with earlier studies; furthermore, it can
provide actual dynamic response data for direct computer analysis
correlation.
In addition, this investigation had two other specific objectives, as
follows:
1. Evaluation of the overall dynamic response of the test frame
subjected to scaled earthquakes of differing intensities, simulating
the API "Strength Level", "Ductility Level", and "Maximum Credible"
earthquake motions.
2. To provide observations of the actual dynamic inelastic behavior of
brace members and the failure mechanism of the test frame.
The special test fixture designed to make possible dynamic
experimentation with two-dimensional frame structures, as well as
details of the test model and its material properties and discussed in
Chapter 2. Descriptions of the structural response instrumentation and
of the experimental procedures employed are presented in Chapter 3 and
Chapter 4, respectively.
The observed dynamic response of the test model is presented in the
form of graphical displays in Chapter 5. Time history plots of the
table motions and global responses of the test frame (such as lateral
forces and displacements) are discussed, and the global lateral force
versus lateral displacement hysteresis loops are examined. Also, the
deterioration of global frame strength and stiffness are discussed. In
addition to these date on the global response, most of which were
included in the preliminary report submitted to the API project
sponsors, the present report also gives detailed information on some
aspects of the local dynamic response, such as brace deformations and
buckling behavior.
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