Simplified Shear Design of Structural COncrete Members


Simplified Shear Design of

Structural Concrete Members Appendixes



Prepared for: National Cooperative Highway Research Program

Submitted by: Neil M. Hawkins, Daniel A. Kuchma, Robert F. Mast,

M. Lee Marsh, and Karl-Heinz Reineck University of Illinois

Urbana, Illinois

July 2005






A.1 Introduction

Appendix A: Models for Shear Behavior

A.1.1 The Problem of Shear Transfer

A flexural member supports loads by internal moments and shear forces. Classical beam theory, in which plane sections are assumed to remain plane, provides an accurate, simple, and effective model for designing a member to resist bending in combination with axial forces. The simplicity and rationality of beam theory can be kept even after cracking for several reasons. The first reason is that flexural cracks form perpendicular to the axis of bending so that the traditional “plane sections remain plane” assumption is valid. The second reason is the weakness of concrete in tension, so that tensile stresses can be effectively neglected at a crack. The third reason is that flexural failure occurs at the maximum moment location so that consideration of conditions at the maximum moment section is sufficient for flexural design.


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