Abstract
An analytical method to determine the out-of-plane strength of confined masonry walls is developed. The method is called the “bidirectional strut method.” Walls with and without openings subjected to combined out-of-plane and axial loads are considered. The method is based on two-way arching action. Masonry compressive strut forces are transferred eccentrically to the concrete confining elements. Flexural and torsional effects, together with the variation of displacements along these elements, are considered. Analytical strengths of confined walls are determined using this method. These strengths are compared with experimental and other analytical strengths. A sensitivity analysis of the strength is carried out considering different variables. It is concluded that the bidirectional strut method accurately predicts the strength of the walls studied. The main variables that affect the strength are the wall aspect ratio, wall slenderness ratio, and the stiffness of the confining elements.
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