| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 104 === To evaluate the seismic performances and effects that dual-core self-centering braces (DC-SCBs) and sandwiched buckling-restrained braces (SBRBs) would make in high-rise buildings, two actual high-rise buildings in Taiwan were selected and modeled with installing of DC-SCBs and SBRBs. In order to avoid the pretension force of tendons in DC-SCB losing during earthquake excitation, an external friction device (EFD) was designed as a fuse in series with the main brace, slipping before the axial strain of tendon exceeded its yield strain.
To estimate seismic parameters of actual high-rise buildings and to validate the dynamic response of analytical model under earthquake excitation, long-term vibration monitoring of a selected Hsinchu high-rise factory building was conducted. A full-scale DC-SCB+EFD and a full-scale SBRB were tested to validate their seismic cyclic performances. Nonlinear time history analyses were conducted on two sets of SMRFs, SMRF+SBRBFs and SMRF+DC-SCBFs to evaluate their seismic demands under both design and maximum considered level of earthquake motions. Analysis results showed that DC-SCB provided well seismic effect in reduction of both maximum and residual drift of frames. SBRB provided well seismic effect in reduction of maximum drift of frames, while might make the residual drift larger.
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