API REPORT 79-25 Inelastic Structural Modeling of Braced Offshore Platforms for Seismic Loading
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API REPORT 79-25 Document Information:
Title
Inelastic Structural Modeling of Braced Offshore Platforms for Seismic Loading
American Petroleum Institute
Publication Date:
Jan 1, 1981
Scope:
Objectives and Scope
In this study state-of-the-art analytical methods of predicting
inelastic behavior of braced
structures are reviewed and assessed by comparing experimental and
analytical results. The study is
an analytical follow-up to experimental investigations on inelastic
brace and braced frame behavior
reported in References 2 and 3. The objectives of this study are to
assess the capabilities of
available analytical models for predicting such inelastic responses,
and to improve the
understanding of the inelastic response of braced structures.
First a brief review of existing post-buckling brace models is made in
Chapter 2. Their
developmental basis, inter-relationships, applicabilities and
limitations are examined in detail.
The basic considerations, member parameters and deformations affecting
brace inelastic behavior are
also identified. A representative brace model is chosen for
implementation in frame analyses and
verified in Chapter 3 against recently available experimental data
[3]. The choice of parameters
for the model is based on the results of individual brace tests [2].
Brace model parameters are
selected to cover a reasonable range of slenderness ratios for
offshore applications. The
analytical model's performance in predicting the experimental behavior
of X-braced tubular steel
towers is evaluated in Chapter 4, and the limitations of the models
are examined. Suggestions for
improved frame and brace modeling are offered. In Chapter 5
experimental data is interpreted to
obtain an improved relationship controling the deterioration of
buckling load with inelastic
cycling. A new model based on a physical representation of a buckling
brace is proposed. This model
may overcome some of the limitations of available models. Conclusions
and recommendations for
future research are offered in Chapter 5.
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