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All Journal Journal of Engineering and Technological Sciences Jurnal Teknik Sipil
Sindur P. Mangkoesoebroto
Structural Engineering Research Group, Civil Engineering Department, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung
Civil Engineering, Building, Construction & Architecture Engineering

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Collapse Risks of Fail-Safe RC Frames Due to Earthquakes: Fragility Assessments Sindur P. Mangkoesoebroto; Made H. Prayoga; Rizkita Parithusta
Journal of Engineering and Technological Sciences Vol. 51 No. 4 (2019)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2019.51.4.3

Abstract

The objective of this study was to determine the collapse risk of fail-safe reinforced concrete (RC) frames due to earthquakes by newly developed fragility curves. The curves were constructed based on the collapse mechanism, instead of measures of lateral drift as customarily adopted. The procedure was applied to RC open frames that were seismic resistant. A fail-safe mechanism was imposed by allowing plastic hinges to be formed mainly in the beams. This automatically satisfied the stronger column-weaker beam requirement; shear failure was neither tolerated anywhere in the columns nor in the beams. Two kinds of fail-safe RC frames were investigated: special moment resisting frames (SMF) and ordinary moment resisting frames (OMF). Their earthquake collapse risk was computed and compared. Inelastic time history (NLTH) and the non-linear static procedure (NSP) were conducted to assess their structural performance. The results showed among others that the fail-safe OMF had lower collapse risk than the fail-safe SMF. The collapse prevention performance level in NLTH could only be achieved for the fail-safe frames. The non-linear time history analysis should be the only method used for seismic reevaluation/safety checking of building frame structures.
Karakterisasi Gerakan Gempa berdasar Spektrum Indeks Intensitas Komposit Sindur P. Mangkoesoebroto; Niakku Maggang
Jurnal Teknik Sipil Vol 29 No 1 (2022): Jurnal Teknik Sipil
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2022.29.1.1

Abstract

Abstract This study proposed an alternative method to earthquake ground motion characterization based on composite-intensity index spectrum. It is a combination of spectral acceleration (Sa(T)), duration (D05-95) and peak ground velocity (PGV). The spectrum, considering the effect of three-component motions, was firstly introduced in the paper. It was established based on thirty-one three-component strong earthquake records that were collected worldwide. The index was further related to the modified Mercalli intensity scales to assign its damage potentials. The method revealed more meaningful interpretations of earthquake ground motion characterization than other procedures. Keywords: Earthquake motion characterization, three components, composite-intensity index, acceleration spectrum, duration, peak ground velocity, MMI. Abstrak Studi ini mengusulkan metode alternatif terkait karakterisasi gelombang gempa berdasarkan spektrum indeks intensitas komposit. Indeks ini adalah gabungan dari spektra percepatan (Sa(T)), durasi (D05-95) dan kecepatan puncak permukaan (PGV). Spektrum indeks intensitas komposit, dengan tinjauan gelombang gempa tiga-komponen, adalah yang diusulkan pertama kali dalam makalah ini. Metode ini dikembangkan berdasarkan tiga-puluh satu gelombang gempa tiga-komponen yang tersebar di dunia. Indeks tersebut selanjutnya diikatkan dengan skala intensitas Mercalli termodifikasi untuk menunjukkan potensi kerusakannya. Hasil yang diperoleh menunjukkan bahwa karakterisasi gelombang kuat dapat dilakukan berdasar indeks intensitas komposit lebih baik daripada metode lain yang tersedia. Kata kunci: Karakterisasi gelombang gempa, tiga komponen, indeks intensitas komposit, spektrum percepatan, durasi, kecepatan puncak, permukaan, skala MMI.
Spectral Matching of Three-Component Seismic Ground Accelerations for Critical Structures Sindur P. Mangkoesoebroto; Adi Yasa; Ediansjah Zulkifli
Jurnal Teknik Sipil Vol 30 No 1 (2023): Jurnal Teknik Sipil
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2023.30.1.5

Abstract

Abstract This study introduces a new procedure for three-component spectral matching of seismic ground acceleration records. The procedure involves preserving the phase angle and varying the Fourier amplitudes to match the spectra of the recorded records with a provided target spectrum that represents the spectral values of ground motions in three orthogonal directions. Several three-component recorded records were matched against two target response spectra to test the method. An accurate convergence was achieved in the velocity and displacement records. In addition, the scales among the components’ magnitude were maintained, creating realistic three-component ground motions. Such ground motion inputs are important to qualify critical structures sensitive to three-component motions. Our proposed procedure is novel because the present practices are mostly created based on one-component ground motions. Keywords: Spectral matching, three components, component scales, phase angle, critical structures. Abstrak Studi ini mengusulkan prosedur baru terkait penyesuaian spektra catatan percepatan gempa. Prosedur ini dilakukan dengan mempertahankan sudut phasa tetapi mengubah amplitudo Fourier catatan percepatan gempa demikian hingga spektrumnya sesuai dengan target. Target spektrum yang diinputkan mewakili tiga komponen gempa. Untuk mengujinya, beberapa catatan gempa tiga-komponen disesuaikan spektrumnya terhadap dua target spektra. Ketelitian yang cukup baik terlihat dari catatan kecepatan dan simpangan. Skala ketiga komponen juga dijaga sehingga dihasilkan percepatan gempa tiga-komponen yang realistis. Percepatan gempa sejenis ini diperlukan dalam proses kualifikasi struktur penting yang sensitif terhadap pengaruh gerakan tiga arah. Prosedur tersebut adalah baru karena teknik yang ada sekarang didasarkan pada penyesuain spektrum per-komponen. Kata-kata Kunci: Penyesuaian spektra, tiga komponen, skala komponen, sudut phasa, struktur penting.  
Co-Authors Adi Yasa Ediansjah Zulkifli Made H. Prayoga Niakku Maggang Rizkita Parithusta