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Orthotropic triangular finite elements with double curvature have been used in analyzing the multi-wing hyperbolic paraboloid shell roof of the American Airline aircraft hangar, San Francisco, California. The shell surface made out of corrugated steel sheets contains also a framework of steel beams. A typical two-flank portion of the shell roof, which covers an area of 460 ft by 560 ft, has been idealized into an assembly of 527 finite elements and beams with 614 nodes requiring the solution of 2075 equations for each one of the four loading conditions.
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Agrawal et al. (1971) studied this question.
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