INFLUENCE OF SHEAR WALL CONFIGURATION ON SEISMIC FRAGILITY OF BUILDINGS WITH DUAL REINFORCED CONCRETE SYSTEM
DOI:
https://doi.org/10.18867/ris.114.671Keywords:
seismic fragility, shear walls, dual system, incremental dynamic analysisAbstract
Shear walls, integrated into conventional reinforced concrete moment-resisting frame systems, have proven to be effective seismic protection elements by enhancing lateral stability and reducing the structural fragility of buildings. However, the impact of different configurations on seismic response has been insufficiently explored using advanced three-dimensional models. This study adopts a probabilistic approach to analyze the seismic fragility of five eight-story buildings with variations in the in-plane distribution of shear walls using 3D models. To achieve the objectives of this work, the structural capacity of the buildings was first assessed through Incremental Dynamic Analysis (IDA). Seismic analyses considered representative ground motion records from the soft soils of Mexico City, which were scaled to different intensity levels. Subsequently, fragility curves were developed for all the buildings, taking into account the varying in-plane configurations of the shear walls. The results reveal that a symmetrical arrangement of shear walls along the building's exterior significantly reduces seismic fragility by minimizing torsional effects, particularly in exterior columns. Conversely, placing shear walls at the center of the building, a common practice for accommodating elevators or utility installations, proves less efficient structurally, requiring larger frame sections to achieve comparable fragility levels. Consequently, strategic planning in the design of dual systems is crucial to optimizing seismic performance.
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