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Abstract

Identifying dynamic characteristics of civil engineering structures is still a challenging task. It intends to assess behavior of the structures under time-dependent loads. This paper discusses a methodology suitable for identifying the characteristics of multi-story buildings using only their measured response under earthquake ground excitations. Appropriateness of technique used for structural identification was corroborated through coherence of the structure’s responses. The methodology was applied for identifying the characteristics of 14-story and 20-story office buildings located in a high seismic region. Responses of these two buildings recorded during three different seismic ground motions were investigated. The buildings’ response spectral densities and singular values were computed and utilized to identify their dynamic characteristics, viz. modal frequencies, damping factors, and mode types such as bending or torsion mode. Results of this study were validated through comparisons with the results reported using different structural identification techniques. It indicated that the methodology implemented in this study was capable of identifying the dynamic characteristics of multi-story buildings using responses under seismic ground motions.

Bahasa Abstract

Identifikasi Karakteristik Dinamik Gedung Bertingkat dengan Menggunakan Respons Seismik dari Struktur. Identifikasi karakteristik dinamik struktur sipil bertujuan untuk mempelajari perilakunya akibat beban yang bervariasi dengan waktu. Makalah ini membahas metodologi untuk identifikasi struktur gedung bertingkat dengan hanya menggunakan respons yang diukur selama terjadi gempa. Dalam makalah ini, koherensi respons struktur digunakan untuk menjustifikasi penerapan metode yang dipakai. Metodologi tersebut diaplikasikan untuk identifikasi karakteristik dinamik (frekwensi, faktor redaman, dan ragam) struktur gedung bertingkat 14 dan 20 dengan menggunakan respons percepatan yang direkam selama tiga kejadian gempa. Hasil dari studi ini dibandingkan dengan hasil studi terdahulu yang diperoleh dengan metode yang berbeda. Hasil tersebut mengindikasikan bahwa metodologi ini mampu mengidentifikasi karakteristik dinamik struktur gedung bertingkat dengan menggunakan responsnya akibat beban gempa.

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