¹ Professor and Vice Chair, 733 Davis Hall, Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720-1710,  mosalam@ce.berkeley.edu

ABSTRACT

Reinforced concrete (RC) frames with unreinforced masonry (URM) infill walls are common structural systems in seismic regions. In the same structural system, both bare and infilled frames may exist rendering the system hybrid in nature. The seismic evaluation of this complex structural system based on recent shaking table experiments and hybrid simulations is presented in details. In the hybrid simulations, computational and physical models are combined. Findings related to the behaviour of such systems are discussed. Comparisons between the results from the shaking table tests and those from the hybrid simulations are also presented. Moreover, the paper reviews observations and damages of RC frames with URM infill walls from a recent earthquake. The presented study culminates with development of fragility functions for in-plane, out-of-plane, and combined failures using finite element method and first order reliability analysis. These fragility functions are presented in a companion paper, reference [8], of these proceedings. Finally, brief discussion on the development and use of a novel direct element removal algorithm for progressive collapse analysis in infilled systems is presented.

KEYWORDS: earthquake, hybrid simulations, infill walls, progressive collapse, shaking table