Abstract
Test pieces equipped with wire strain gauges were used to investigate the distortion of cross sections of bars made of oriented glass-reinforced plastics (GRP) in tension and bending. The need for modified design formulas, obtained without use of the simplifying hypothesis of plane sections, is demonstrated. The previously obtained theoretical results of [2, 3] are experimentally confirmed. The effect of the free ends on beam deflection is found to be unimportant.
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