EXPERIMENTAL MEASUREMENTS AND NUMERICAL NON-LINEAR SIMULATION OF THE IN-PLANE BEHAVIOUR OF R/C FRAMES WITH MASONRY INFILLS UNDER CYCLIC EARTHQUAKE-TYPE LOADING

Abstract eng:
Masonry infills within multi-story reinforced concrete (R/C) framed structures were damaged to a considerable extend during past strong earthquake activity. The realism of numerically simulating the cyclic earthquake-type behaviour of masonry infilled R/C frames was studied extensively in the past by comparing numerical predictions with results from a series of pseudo-dynamic tests on masonry infilled R/C frame specimens. An advanced non-linear 2-D numerical simulation was validated which can realistically capture the inplane hysteretic behaviour of reinforced concrete (R/C) frames with masonry infills when subjected to combined in-plane vertical and cyclic seismic-type horizontal load. Observations of failure modes for R/C infilled frames with columns under-designed in shear have shown that, when subjected to earthquake loads, the development of shear failure for the columns is an additional realistic scenario. The advanced non-linear 2-D numerical simulation is extended here to include both flexural and shear modes of failure for the R/C columns resulting from the interaction of the masonry infill with the R/C frame. A macro-model have been adopted for the numerical simulation of the masonry infill that retains the non-linear behaviour of the masonry infill itself as well as the non-linear behaviour at the contact area between the masonry-infill and the surrounding frame. Next, the effectiveness of a micromodeling numerical approach is also examined for simulating the behaviour of masonry infill within a R/C frame when different types of openings are present in the masonry infill. The results from three framed masonry infill specimens that were tested under horizontal cyclic loading at have been also utilized for the validation of this micro-modeling approach. Both simulation strategies were quite successful in predicting the observed response in terms of stiffness, strength, and modes of failure for either the masonry or the R/C frame

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket