Flexural Reinforcement Limits For Masonry Shear Walls

Summary

The need for flexural reinforcement limits in masonry shear  walls was investigated, and the basis and validity of the International Building Code (IBC) provisions were assessed.   Past research has shown that the flexural performance and ductility of reinforced masonry shear walls loaded in-plane are affected by several interacting factors, including axial  load, aspect ratio, material strengths, and the amount of flexural reinforcement.  To better understand the effects of  these parameters, moment-curvature analyses were performed on masonry shear walls with varying flexural reinforcement ratios, axial loads and material properties.  Curvature capacities obtained from the analyses were compared to curvature demand based on the IBC drift limits.  Questions have arisen on the basis of the code provisions limiting the  flexural reinforcement for masonry shear walls, especially for low aspect ratios since behavioural modes other than flexure will dominate the response.  The moment-curvature analyses predict curvature capacities significantly greater than those the code currently considers.  Consequently, the code flexural reinforcement limits are overly conservative for shear walls with an aspect ratio greater than 2.5.  20 refs.

Primary author(s): Tallon C L; Mclean D I; Pollock D G; Young T C

                            Washington State,University; Northwest Concrete Masonry

Source: Masonry (9). Proc.6th Int.Masonry Conf.

            London,4-6 November 2002,p.477-486

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