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Earthquakes and Structures
  Volume 23, Number 2, August 2022 , pages 197-206

Evaluation of ductility capacity of steel-timber hybrid buildings for seismic design in Taiwan
Pei-Ching Chen and I-Ping Su

    Recently, steel-timber hybrid buildings have become prevalent worldwide because several advantages of both steel and timber structures are maintained in the hybrid system. In Taiwan, seismic design specification related to steel-timber hybrid buildings remains void. In this study, the ductility capacity of steel-timber hybrid buildings in Taiwanese seismic design specification is first proposed and evaluated using nonlinear incremental dynamic analysis (IDA). Three non-linear structural models, 12-story, 8-story, and 6-story steel-timer hybrid buildings were constructed using OpenSees. In each model, Douglas-fir was adopted to assemble the upper 4 stories as a timber structure while a conventional steel moment-resisting frame was designated in the lower part of the model. FEMA P-695 methodology was employed to perform IDAs considering 44 earthquakes to assess if the ductility capacity of steel-timber hybrid building is appropriate. The analytical results indicate that the current ductility capacity of steel moment-resisting frames can be directly applied to steel-timber hybrid buildings if the drift ratio of each story under the seismic design force for buildings in Taiwan is less than 0.3%. As a result, engineers are able to design a steel-timber hybrid building straightforwardly by following current design specification. Otherwise, the ductility capacity of steel-timber hybrid buildings must be modified which depends on further studies in the future.
Key Words
    ductility capacity; incremental dynamic analysis steel-timber hybrid building; seismic design
Pei-Ching Chen and I-Ping Su:Department of Civil and Construction Engineering, National Taiwan University of Science and Technology, No.43, Sec.4,
Keelung Rd., Taipei 106335, Taiwan

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