Civil Engineering Calculations Using SI Units

by R. Ernest Leffel, (F.ASCE), Vice Pres.; Camp Dresser & McKee Inc., Boston, Mass.,

Serial Information: Engineering Issues: Journal of Professional Activities, 1976, Vol. 102, Issue 1, Pg. 99-116

Document Type: Journal Paper

Discussion: Lorsch Harold G. (See full record)

Abstract: The change from customary U.S. to the SI units of measurement will be more than a simple matter of converting numbers. It will require rethinking of computation approaches as the new system is absolute rather than gravitationally based. Mass, weight and force are not interchageable. Weight, which is a force unit, is a newton, not a kilogram. The value for acceleration due to gravity when calculations are made in SI units will be removed from customary static equations and added to customary dynamic equations. Typical methods for the computations that may prove challenging in SI units are shown. Tables containing recommended practice in the selection of prefixes and units, conversion factors, and rules for the use of SI, are included. The changeover also allows a basic reconsideration of modules to simplify specifications and standards for manufacturers.

Subject Headings: Computing in civil engineering | Statics (mechanics) | Standards and codes |

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