Research Article
Jan 1948
Influence Lines for Continuous Structures by Geometrical Computation
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VIEW THE REPLYPublication: Transactions of the American Society of Civil Engineers
Volume 113, Issue 1
Abstract
As the practical span length of continuous girder bridges and rigid frame bridges becomes progressively greater, the use of influence lines or coefficients, for the purpose of investigating the effect of more numerous possible combinations of loading, and for placing loads for maximum effect, becomes correspondingly important. Although such influence lines may be constructed in the usual manner by loading the structure at a number of different points and computing the resulting stress or moment, this is an arduous task and amounts to finding the desired load points by trial and error. The equality of the elastic curve of a structure loaded with a unit deformation at the point for which the stresses are desired, and the influence line for stress at that point, has long been used for determining the influence line for trussed structures. The principle was applied mechanically to all types of indeterminate structures by the late George Beggs,2 M, ASCE, Otto Gottschalk,3 and others.
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© 1948 American Society of Civil Engineers.
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Published in print: Jan 1948
Published online: Feb 10, 2021
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Dean F. Peterson Jr., AM.ASCE
Associate Prof. of Civ. Eng., Utah State Agri. College, Logan, Utah.
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