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Abstract

Seismic Performance Improvement of University Buildings not applying Seismic Design

Woo Young Song

Department of Architectural Engineering, The Graduate School of Industry, Pukyung National University

Abstract The purpose of this study is to investigate the seismical behavior of university buildings not designed by seismic criteria. 5-story buildings with different plan type were analyzed by using MIDAS-GEN. The main parameters in this study are the seismic retrofit measures with earthquake resisting wall, steel brace, reinforcing columns and the exterior of the buildings. The finding of this study is as follow:

(1) The analysis result shows that there is distinct difference between the cycle of model A and B for mode No. 1-3 but the difference between them is imperceptible for mode No. 4-15. At the result of comparisons between non reinforcing model and reinforcing model, the cycle of model applying RC earthquake resisting wall most decreased among 4-models.

2) The analysis result shows that there is distinct difference between the modal participation mases of model A and B for mode No. 1-3 but the difference between them is imperceptible for mode No. 4-15. At the result of comparisons between non reinforcing model and reinforcing model, the cycle of model applying RC earthquake resisting wall most increased among 4-models.

3) In conclusion, A Comparison on results of displacement as X-direction by Earthquake Loading analysis, A building distinguished from B building by the top floor to compare X-direction displacement. In comparison A and B building before reinforcement, model applying RC earthquake resisting wall is the most decrease displacement of X-direction(0.23cm, 0.19cm). Also reinforcement by brace of steel is a very small decrement of X-direction displacement(0.07cm, 0.08cm) for reason of which stiffness of steel truss in weak-axis of steel frame isn't enough to be strong.

4) In conclusion, A Comparison on results of displacement as Y-direction by Earthquake Loading analysis, A building distinguished from B building by the top floor to compare X-direction displacement. In comparison A and B building before reinforcement, model applying RC earthquake resisting wall is the most decrease displacement of Y-direction(0.33cm, 0.34cm). Also reinforcement by brace of steel is a very small decrement of X-direction displacement(0.12cm, 0.18cm) for reason of which stiffness of steel truss in weak-axis of steel frame isn't enough to be strong.

5) Scale Up Factor comparison analysis(analyzed) results showed that comparison with before reinforcement model(A-1, B-1) indicates that this is about 15% increase in RC quake resisting wall reinforcement because of weight increasement. Steel brace reinforcement(A-3, B-3) is no difference between X, Y direction. And it about 9% decrease by steel truss of stiffness ability.

6) Weight comparison analysis(analyzed) results showed that comparison with before reinforcement model(A-1, B-1) indicates that reinforcement(A-2, A-4, A-5, A-6, B-2, B-4, B-5, B-6) is needed base reinforcement by extremes increasement of weight(0.88~6,70%, 1.06~6.67%)

7) Analysis results showed that steel brace reinforcement(A-3, B-3) is judged very appropriate method.