Damien L. Keogh-Bridge Deck Analysis 1999





Preface

Twenty-five years ago, fairly complex skew, prestressed concrete bridge decks could be

analysed with a fair degree of accuracy—but only by using manual methods. The famous

Rusch and Hergenroder influence surface charts, translated from the German by the Cement

and Concrete Association, gave surfaces for various stress and aspect ratios up to a 45° skew.

Full analysis of a bridge deck involved, amongst other techniques, the use of planimeters on

the way to calculating volumes under the influence surface, in turn leading to the calculation

of mx, my and mxymoments. The method was tedious, somewhat approximate and could often

take weeks. Indeed, if an error arose early on in the calculations, many days could be spent in

re-analysing. Now, it is possible to change a dozen variables and a computer program will

recalculate stresses and reactions in seconds.


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