Displacement Capacity of Confined Masonry Structures With Horizontal Reinforcement: Shaking Table Tests

Abstract eng:
Two half-scale three-story specimens with a single axis of a typical earthquake resistant structural system for housing with different amounts of horizontal reinforcement were constructed. Scaled masonry units were obtained by cutting traditional solid clay bricks. Specimens were tested in a shaking table and were subjected to strong ground motions representative of Mexico City’s seismic environment. Instrumentation was designed to measure detailed responses of story accelerations, displacements and strains in tie-columns, tie-beams and horizontal reinforcement steel bars. Displacement capacity of walls was compared to estimated capacity obtained from preliminary pseudo-static tests of half-scale masonry walls. Based on test results, estimates of appropriate drift limits are recommended; drift and ductility demands calculated from roof displacements and base shear envelopes were used to estimate the appropriate seismic shear force reduction factor. Measured shear strength was compared with that calculated from code provisions.

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