MACRO-MODEL CALIBRATION OF A STRONG CLAY MASONRY INFILL TO IN-PLANE CYCLIC TESTS

Abstract eng:
Poor performance of reinforced concrete infilled frame buildings observed in recent post-earthquake reconnaissance may underline a deficiency in our knowledge on the seismic behavior of RC buildings with masonry infills. Past experiments have lacked tests on strong infills recently introduced in modern construction practices in Europe. As the strong typology significantly influences global building behavior, a comprehensive appraisal of the seismic performance for both full and open infill panels will improve our assessment of building performance. A recent experimental campaign on single-story RC frames infilled with a strong masonry typology has been carried out to evaluate and identify drift indices at the damage and ultimate limit state. Calibration of a macro model to the data has improved the accuracy of a macro model for nonlinear dynamic analysis of infilled RC frame buildings. Specific focus on the hysteretic properties of the frame and infill elements in the numerical model has brought significant improvement in accuracy. The need to model local effects has been circumvented by special interpretation of the experimental data. In particular, the infill’s effect on the global behavior of the infilled frame subassembly has been extracted by taking comparing the hysteresis of the infilled frame and the bare frame at matching target drifts. The macro model’s hysteresis rules are specifically intended for infill struts and have been adjusted for the strong infill typology. A smooth hysteresis closely mimics the tangent stiffness of the reloading and unloading branches to better match energy dissipation, strength, and stiffness. The strength envelope has been modified to account for a post-peak strength plateau exhibited by the strong infill. The results from the parametric optimization may be implemented in nonlinear dynamic analyses with adjustment to existing empirical equations that estimate the strut properties per the masonry characterization.

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