The Structural Engineer > Archive > Volume 17 (1939) > Issues > Issue 8 > Analysis of Portal Frames by the Column Analogy
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Analysis of Portal Frames by the Column Analogy

THE American Concrete Institute has recently published an analysis of the number of rigid frame bridges built during the last decade, and these figures show in a striking fashion the remarkable and steady increase in this type of construction in the United States. In 1926 the number of portal frame bridges built was seven, in 1931 it had risen to 39 per annum, and the number constructed in 1936 was 81. About 70 per cent. of the portal frame bridges since 1922 have been of a single span. W. Fisher Cassie

Author(s): Cassie, W Fisher

Keywords: portal frames;analysis