List of publications
Publication: Seismic behavior of framed masonry panels with prior damage when subjected to out-of-plane loading (2011)
Preparation and upload by:
Filip Anic, Faculty of Civil Engineering and Architecture Osijek, Josip Juraj Strossmayer University of Osijek
List of test setups
Publication abstract (click to enlarge):
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This paper describes the preliminary results of experimental research undertaken to study the behavior of framed masonry panels under simulated out-of-plane ground motions with prior in-plane damage. Three half-scaled framed masonry panel specimens were fabricated with conventional solid burnt clay bricks and the masonry was laid after the RC frame was cast. Both the materials and construction
This paper describes the preliminary results of experimental research undertaken to study the behavior of framed masonry panels under simulated out-of-plane ground motions with prior in-plane damage. Three half-scaled framed masonry panel specimens were fabricated with conventional solid burnt clay bricks and the masonry was laid after the RC frame was cast. Both the materials and construction technique used in fabricating the specimens are commonly used in India. Of the three specimens, two specimens represented typical confined masonry construction whereas the third represented more popular infill frames.
Relatively little work has been reported on the effects of in-plane damage on out-of-plane behavior, which is one of the most important factors to be considered when predicting the behavior of infill masonry during earthquakes.
To assess the effect of in-plane damage on their out-of-plane behavior, three half-scaled clay brick framed masonry panels were subjected to a sequence of slow cyclic in-plane drifts and shake table-generated out-of-plane ground motions. The framed panels maintained structural integrity and out-of-plane stability even when severely damaged.
DESIGN AND CONSTRUCTION OF THE TEST SPECIMENS:
The unique testing method used in this study, which involved successive applications of out-of-plane and in-plane loading, was arranged so that there was no need to move the specimen for the repeated cycles of in-plane and out-of-plane loading.
A 1.8 m x 1.2 m servohydraulic-driven uniaxial shake table was used for the out-of-plane loading. For in-plane loads, four bars with a diameter of 20 mm were used to connect both ends of the top beam with a 100 kN servohydraulic actuator. The in-plane supports were attached to the strong-reaction floor to transfer overturning loads generated during the in-plane loading without overstressing the shake table bearings.
The specimens with slender walls (S1WF and S2WG) experienced higher amplification of accelerations (inertia forces) and the maximum amplification was observed at mid-height. In contrast, the less slender specimen (S3SF) had a nearly linear profile of acceleration response along the height, with the maximum value near the top. Interior grid elements that divided masonry into smaller subpanels improved both the in-plane and out-of-plane response. These not only helped reduce out-of-plane deflection but also greatly improved the in-plane response and overall energy dissipation potential. Consequently, out-of-plane failure of the masonry was delayed and the wall could safely sustain large in-plane drifts up to 2.2%. Further, out-of-plane failure of masonry infill panels was not entirely due to increased accelerations (inertial forces), but was hastened by excessive out-of-plane displacements.
RECOMMENDATIONS FOR FUTURE RESEARCH
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