Abstract
"Equilibrium of forces" is the principle used in the current New Zealand code requirements for shear reinforcement of beam column joint. This principle, however, yields irrational or empirical aspects of the current code requirements. The latter principle as well as a simplification of stress distribution along the periphery of the joint can yield a design equation to calculate the necessary amounts of shear reinforcement in inelastic interior joint. Normally, this design equation requires smaller amounts of shear reinforcement than the current New Zealand code, especially for the following cases: a) the joint shear stress is small, b) the axial force is small, c) the amount of top beam reinforcement is larger than at the bottom, and d) the amounts of vertical shear reinforcement is large.
Highlights
New Zealand code requirements for shear reinforcement of beam column joint
The objective of this paper is to develop a design equation for joint shear reinforcement based on the principle of equilibrium of stresses
If we add all the horizontal hoop actions required in the three shear resisting mechanisms listed above, we obtain the necessary amount of horizontal joint shear reinforcement
Summary
If we add all the horizontal hoop actions required in the three shear resisting mechanisms listed above, we obtain the necessary amount of horizontal joint shear reinforcement. We define the horizontal joint shear reinforcement as the hoops placed between the top and bottom beam bars. The remaining hoop actions, (Vqa + V ^ ) /2 above the top beam b a r and Vqfc/2 belowthebottombeambar , are assumed to be carried by the hoops in the columns above and below the joint, respectively. In order to compare the above equation with the current NZ code requirements, let us consider the case when: Jc " Jb '
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