CHAPTER 13

BEAMS AND FRAMES HAVING NONPRISMATIC MEMBERS

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The use of variable-moment-of-inertia girders has reduced considerably the deadweight loading of each of these spans.

CHAPTER OBJECTIVE

  • To show how to analyze beams and frames that have nonprismatic sections.
13.1 INTRODUCTION

Often, to save material, girders used for long spans on bridges and buildings are designed to be nonprismatic, that is, to have a variable moment of inertia. The most common forms of structural members that are nonprismatic have haunches that are either stepped, tapered, or parabolic, Fig. 13–1. The deflection and slope of these ...

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