scholarly journals Desain Tahan Gempa Jembatan Ngarai Sianok di Bukittinggi, Sumatera Barat - Indonesia. (Hal. 19-30)

2019 ◽  
Vol 5 (1) ◽  
pp. 19
Author(s):  
Nurul Hakim ◽  
Engkon K. Kertapati ◽  
Edward V. M.
Keyword(s):  
Wave Propagation ◽  
Seismic Hazard ◽  
Ground Motion ◽  
Hazard Analysis ◽  
Probabilistic Seismic Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard ◽  
Propagation Analysis ◽  
Deterministic Seismic Hazard ◽  
Deterministic Seismic Hazard Analysis

ABSTRAKJembatan Ngarai sianok dibuat dengan struktur jembatan cable stayed dengan panjang bentang 685 m. Memiliki tinggi pilar 173,5 m. Jembatan ini berada di samping sesar aktif Ngarai sianok sejauh 162 m. Kondisi jembatan yang berada sangat dekat dengan lokasi sumber gempa sesar Ngarai Sianok, membuat analisis bahaya gempa Jembatan Ngarai Sianok mengacu pada perilaku khusus Sesar. Dalam perencaan struktur bangunan, beban gempa rencana untuk analisis respon dinamik digunakan respon spektrum dari karakteristik sesar Ngarai Sianok.Metoda analisis yang digunakan yaitu metode Deterministic Seismic Hazard Analysis (DSHA) dan Probabilistic Seismic Hazard Analysis (PSHA). Analisis perambatan gelombang menghasilkan rekomendasi respon spektrum desain permukaan untuk periode ulang gempa 950 tahun dengan PBA = 0,973 . Perbandingan respon spektrum permukaan di lokasi jembatan Ngarai Sianok menunjukkan bahwa hasil analisis perambatan gelombang cendrungan lebih dekat ke Tanah Keras untuk klasifikasi site dari SNI 03-1726-2016 untuk PBA = 0,97 .Kata kunci: cable-stayed, sesar, ground motion, respon spektrum. ABSTRACTNgarai Sianok Bridge is made with a Cable Stayed bridge structure with a span length of 685 m. Has a pillar height of 173.5 m. This bridge is beside the active canyon sianok as far as 162 m. The condition of the bridge which is very close to the location of the Ngarai Sianok fault source, made an earthquake hazard analysis of the Ngarai Sianok Bridge referring to the special behavior of Fault. In planning the structure of the building, the earthquake load planned to analyze the dynamic response used a spectra response from the characteristic character of the Ngarai Sianok fault.The analytical method used is the Deterministic Seismic Hazard Analysis (DSHA) method and Probabilistic Seismic Hazard Analysis (PSHA). Wave propagation analysis results in a recommendation of a surface design response for the return period of a 950 year earthquake with PBA = 0.973 . Comparison of the surface spectrum response at the Ngarai Sianok bridge location shows that the results of the wave propagation analysis tend to be closer to hard soil for the site classification of SNI 03-1726-2016 for PBA = 0.97 .Keywords: cable stayed, fault, ground motion, spectra response.

Ranking of Ground-Motion Models (GMMs) for Use in Probabilistic Seismic Hazard Analysis for Iran Based on an Independent Data Set

2020 ◽  
Author(s):  
Zoya Farajpour ◽  
Milad Kowsari ◽  
Shahram Pezeshk ◽  
Benedikt Halldorsson
Keyword(s):  
Seismic Hazard ◽  
Ground Motion ◽  
Selection Process ◽  
Hazard Analysis ◽  
Probabilistic Seismic Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard ◽  
Data Set ◽  
Motion Models ◽  
Ground Motion Models

ABSTRACT We apply three data-driven selection methods, log-likelihood (LLH), Euclidean distance-based ranking (EDR), and deviance information criterion (DIC), to objectively evaluate the predictive capability of 10 ground-motion models (GMMs) developed from Iranian and worldwide data sets against a new and independent Iranian strong-motion data set. The data set includes, for example, the 12 November 2017 Mw 7.3 Ezgaleh earthquake and the 25 November 2018 Mw 6.3 Sarpol-e Zahab earthquake and includes a total of 201 records from 29 recent events with moment magnitudes 4.5≤Mw≤7.3 with distances up to 275 km. The results of this study show that the prior sigma of the GMMs acts as the key measure used by the LLH and EDR methods in the ranking against the data set. In some cases, this leads to the resulting model bias being ignored. In contrast, the DIC method is free from such ambiguity as it uses the posterior sigma as the basis for the ranking. Thus, the DIC method offers a clear advantage of partially removing the ergodic assumption from the GMM selection process and allows a more objective representation of the expected ground motion at a specific site when the ground-motion recordings are homogeneously distributed in terms of magnitudes and distances. The ranking results thus show that the local models that were exclusively developed from Iranian strong motions perform better than GMMs from other regions for use in probabilistic seismic hazard analysis in Iran. Among the Next Generation Attenuation-West2 models, the GMMs by Boore et al. (2014) and Abrahamson et al. (2014) perform better. The GMMs proposed by Darzi et al. (2019) and Farajpour et al. (2019) fit the recorded data well at short periods (peak ground acceleration and pseudoacceleration spectra at T=0.2  s). However, at long periods, the models developed by Zafarani et al. (2018), Sedaghati and Pezeshk (2017), and Kale et al. (2015) are preferable.

scholarly journals ANALISIS PROBABILISTIK BAHAYA GEMPA PADA BENDUNGAN WADASLINTANG

2018 ◽  
Vol 6 (4) ◽  
Author(s):  
Rahma Kusuma Dewi ◽  
Yusep Muslih Purwana ◽  
Raden Harya Dananjaya
Keyword(s):  
Seismic Hazard ◽  
Ground Motion ◽  
Hazard Analysis ◽  
Probabilistic Seismic Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard

<p>Indonesia merupakan salah satu negara dengan dengan tingkat intensitas kegempaan yang cukup tinggi, terlihat dari lokasinya yang berdekatan dengan sumber-sumber gempa diantaranya, zona subduksi, sesar (fault) yang aktif, dan cinicin api pasifik (gunung berapi) yang tersebar di sepanjang negara kepulauan ini. Diantara beberapa pulau di Indonesia, Pulau Jawa menjadi salah satu pulau dengan aktivitas seismik yang tinggi. Pulau dengan jumlah penduduk paling banyak, sebagai pusat pemerintahan dan kegiatan industri menjadikan Jawa mempunyai tingkat resiko kerusakan bangunan dan infrastruktur yang cukup tinggi. Salah satu bangunan yang mempunyai tingkat resiko tinggi adalah bendungan urugan. Penelitian ini akan mengevaluasi bahaya gempa pada salah satu bendungan besar Indonesia yaitu Bendungan Wadaslintang. Bendungan ini terletak di perbatasan 3 kabupaten besar yaitu Kabupaten Kebumen, Purworejo dan Wonosobo. Bendungan ini dibangun pada tahun 1982 sampai 1987, dengan tinggi 116 m. Mengingat usia bendungan yang mencapai 31 tahun serta potensi gempa yang cukup tinggi, maka perlu adanya evaluasi terbaru mengenagi resiko gempa di Bendungan Wadaslintang. Analisis ini menggunakan metode <em>Probabilistic Seismic Hazard Analysis</em> (PSHA) dengan bantuan <em>software R-Crisis</em> 2018. Hasil analisis PSHA menunujukkan nilai percepatan tanah maksimum di lokasi tinjuan dengan periode ulang 500, 2.500, dan 10.000 tahun sebesar 0,22 g; 0,35 g dan 0,52 g. Hasil dari proses deagregasi menunjukkan besaran dan jarak gempa yang paling berpengaruh terhadap Bendungan Wadaslintang sebesar 6,87 – 7,13 Mw dan jarak 0-33 km. Hasil pencarian <em>ground motion, </em>didapatkan bahwa Gempa Irpinia, Italia (1980) mempunyai kriteria yang sama dengan lokasi tinjuan sesuai hasil deagregasi.  </p>

Probabilistic Seismic Hazard Analysis and Synthetic Ground Motion Generation for Seismic Risk Assessment of Structures in the Northeast India

2017 ◽  
Vol 8 (2) ◽  
pp. 39-59 ◽  
Author(s):  
Swarup Ghosh ◽  
Subrata Chakraborty
Keyword(s):  
Risk Assessment ◽  
Seismic Hazard ◽  
Ground Motion ◽  
Seismic Risk ◽  
Hazard Analysis ◽  
Probabilistic Seismic Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard ◽  
Seismic Risk Assessment ◽  
Site Specific

This article outlines the performance-based seismic risk assessment (PBSRA) of structures requiring probabilistic seismic hazard analysis (PSHA) to obtain hazard curves and an evaluation of the demand model by a nonlinear structural response analysis under properly selected ground motion records. Unfortunately, such site-specific information is not readily available for Northeast region of India. The present study focuses on these two aspects to supplement the PBSRA. The estimations of hazard curves are demonstrated by considering the seismicity within 300 km radius around the considered locations and specified exposure period. Due to limited availability of natural records in this region, synthetic accelerograms are generated using stochastic point source models by identifying the most contributing magnitude distance combinations from disaggregation of the PSHA results. The significant variabilities observed in the estimated hazard, synthetic accelerograms and nonlinear building responses in the various locations indicate the need of explicit site-specific analysis for PBRSA of structures in the region.

scholarly journals Seismic hazard for the Trans Adriatic Pipeline (TAP). Part 1: probabilistic seismic hazard analysis along the pipeline

2021 ◽  
Author(s):  
D. Slejko ◽  
A. Rebez ◽  
M. Santulin ◽  
J. Garcia-Pelaez ◽  
D. Sandron ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Ground Motion ◽  
Hazard Analysis ◽  
Test Site ◽  
Probabilistic Seismic Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard ◽  
Maximum Magnitude ◽  
Low Frequencies ◽  
The North

AbstractThe design of critical facilities needs a targeted computation of the expected ground motion levels. The Trans Adriatic Pipeline (TAP) is the pipeline that transports natural gas from the Greek-Turkish border, through Greece and Albania, to Italy. We present here the probabilistic seismic hazard analysis (PSHA) that we performed for this facility, and the deaggregation of the results, aiming to identify the dominant seismic sources for a selected site along the Albanian coast, where one of the two main compressor stations is located. PSHA is based on an articulated logic tree of twenty branches, consisting of two models for source, seismicity, estimation of the maximum magnitude, and ground motion. The area with the highest hazard occurs along the Adriatic coast of Albania (PGA between 0.8 and 0.9 g on rock for a return period of 2475 years), while strong ground motions are also expected to the north of Thessaloniki, Kavala, in the southern Alexandroupolis area, as well as at the border between Greece and Turkey. The earthquakes contributing most to the hazard of the test site at high and low frequencies (1 and 5 Hz) and the corresponding design events for the TAP infrastructure have been identified as local quakes with MW 6.6 and 6.0, respectively.

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