Lateral Distribution of Live Loads on Highway Bridges
Publication: Journal of Structural Engineering
Volume 112, Issue 8
Abstract
AASHTO specifications give a load fraction based on only two major variables that affect load distribution on highway bridges. For more economical design, a refinement of the AASHTO values is needed. In this paper, the processes for beam‐and‐slab and box‐girder bridge systems are shown. It is concluded that to make an economical design of a long bridge of moderate span, the accuracy of the transverse load distribution is a key factor. The finite element modeling methods for finding very accurate load distribution normally cannot be used early enough to help the designer at the beginning of the design process. For a multibox bridge, cross‐sectional transverse influence lines can always be developed with relatively short calculations for load distribution and torque.
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References
1.
AASHTO, Standard Specifications for Highway Bridges, 13th ed., 1983, Washington, D.C.
2.
Cornelius, W., Über den Einfluss der Torsionssteifigkeit auf die Verdrehung von Tragwerken, MAN‐Forschungshefte 1951, Augsburg, 1951, pp. 39–65.
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Guyon, Y., “Calcul des ponts larges a poutres multiples solidarisées par des entretoises,” Annual Ponts et Chauss., Sept.–Oct., 1946, pp. 553–612.
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Hall, D. H., “Distribution of Live and Wind Load on a Stringer Bridge,” Technical Services Division, Bethlehem Steel Corporation, Report No. 81‐19‐1, Apr., 1981.
6.
Heins, C. P., and Hou, G. K., “Truck and Wind Load Effects on I‐Girder Bridges with/without Lateral Wind Bracing,” AISI Project 308, Institute for Physical Science and Technology, Univ. of Maryland, Apr., 1980.
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Podolny, W., and Muller, J. M., “Construction and Design of Prestressed Concrete Segmental Bridges,” John Wiley & Sons, New York, N.Y., 1982, p. 169.
8.
Sanders, Jr., W. W., and Elleby, H. A., “Distribution of Wheel Loads on Highway Bridges,” Highway Research Board, No. 83, Washington, D.C., 1970.
9.
AISC Bridge Committee, Task Force on the Sunshine Skyway Bridge Project, “Finite‐Element Analysis of LL Distribution for Skyway Bridge Approaches, Simple‐Span Alternative,” personal communication.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 112 • Issue 8 • August 1986
Pages: 1847 - 1862
Copyright
Copyright © 1986 ASCE.
History
Published online: Aug 1, 1986
Published in print: Aug 1986
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