Seismic Performance of Multi-Story Shearwall with an Adjacent Frame Considering Uplift of Foundation

Abstract eng:
Reinforced concrete wall-frame structures are widely used for buildings. When such structures are subjected to severe earthquakes, rocking and sway motions can be observed at the base of these structures. As a result, foundations supporting rigid structural wall could be uplifted under certain circumstances. It is widely known that the uplift of foundations reduces the damage of structural wall but additional rotation of structural wall causes significant damage to the adjacent frame. The experimental studies dealing with such foundation uplift are not enough so far to establish a rational evaluation method for the performance based design. In order to study the basic performance relating to the uplift of structural walls, a static loading test was conducted using a 40% scale specimen consisting of a multi-story structural wall and an adjacent frame. Based on the test results, restoring force characteristics, energy dissipation capacity, etc. were evaluated, and the shear resisting mechanism was assessed to explain the observed damage propagation. The foundation of the test specimen was free to uplift and the applied horizontal shear force was equilibrated by friction between the specimen and the reaction floor. The damage of the specimen concentrated on the adjacent frame and the structural wall had a minor damage with few cracks. A frame analysis considering the uplift of foundation was also conducted, where the numerical model accurately simulated the envelope curve of the restoring force versus drift angle relations.

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