Abstract
Engineered cementitious composite (ECC) is a typical fiber reinforced cementitious composite with a strain-hardening behavior in tension and can be easily applied to strength masonry structures. This work studies the static behavior of flexural-failure dominant unreinforced masonry (URM) walls strengthened with ECC overlay. Five URM walls were constructed and four of them were reinforced: a wall strengthened with steel mesh, a wall strengthened with single-side ECC overlay, two walls strengthened with double-sides ECC overlay. One of the two double-sides ECC-strengthened walls was designed with a tie column. The effectiveness of reinforcement plans and tie column on the failure mode, lateral strength, hysteresis response, stiffness degradation, energy dissipation capacity, residual displacement and equivalent viscous damping is analyzed. The experimental results indicate that the ECC retrofit techniques can significantly improve the ductility of URM walls. The walls strengthened with ECC overlay exhibit significant increase in the wall drift and energy dissipation and decrease in the residual displacement. Finally, a calculated model for the ECC reinforced walls was proposed to estimate the maximum lateral strength.
Published Version
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