| Summary: | 碩士 === 逢甲大學 === 土木工程所 === 94 === When a tall building is subjected to strong earthquakes, the most undesirable situation is that the higher-mode effect induces excessive seismic inter-story-drift demands in the lower or upper portion of the building, and therefore reduces the earthquake-resisting capability of the building. In order to reduce the maximum story-drift angle of the building, or to have a more homogenous story-drift angle distribution among stories. Alavi B. & Krawinkler H. used shear wall, hinge-connected to frame, and hinge-supported at base, to help the moment resisting frames of the building. Alavi’s method is creative and effective. However, the shear wall was installed outside the building. To attain the same goal, this study replaces the wall by a truss, which can be installed inside the building. In this study, near-fault steel buildings, 3-bay, 10-story, 15-story, 20-story, 30-story, were designed, based on the newly issued Taiwan Seismic code. With the aid of SAP2000 program, Non-linear dynamic simulations have been carried out for frames and frames with complementary truss, separately, by using 14 earthquake date -6 chosen from Chi-Chi near-fault earthquake , and the other 8 from the recording stations in Taichung area. The simulation results show that the story-drift angles of the frames with complementary trusses are less and more homogenous in the vertical direction than that of the original frames. The higher-mode effect is obviously restrained by the complementary trusses.
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