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Kajian Kerusakan Bangunan Sederhana Pasca Gempa Banjarnegara 18 April 2018 Elvis Saputra; Restu Faizah
AGREGAT Vol 4, No 1 (2019)
Publisher : Universitas Muhammadiyah Surabaya

AbstractThe 4.4 SR earthquake occurred in Banjarnegara Regency, especially Kalibening subdistrict, on Wednesday, April 18, 2018. Although it has not high magnitude, the structural damage was severe. There were 201 units of structural damage in term of medium to large. It generates the question from stakeholders, what cause of the structural damage. Therefore, this study visited the affected areas of Banjarnegara Earthquake to investigate the causative factor of structural damage, especially for a simple structure which is residential houses, schools and mosque buildings. The study found some causative factors of structural damages. The first is the depth of the earthquake source that is quite shallow i.e. 4 km. The second is the quality of simple buildings that were damaged or collapsed in the affected area might do not have a good quality and do not qualify for earthquake resistant buildings. The sample of cases found in the field is the structural systems that have not good integrated and good material. Besides that, It was found a community innovation to reduce building costs but they did not have the correct method. An example is the use of bamboo as a substitute for steel reinforcements in the frame. Based on this study, the further research into the bamboo usage guidelines as a substitute for steel reinforcement should be carried out and socialized.Keywords: Earthquake, structural demage, causative factor. AbstrakRabu 18 April 2018 Kabupaten Banjarnagara tepatnya di Kecamatan Kalibening dilanda gempabumi dengan kekuatan 4,4 SR, meskipun magnitud gempa tidak terlalu besar namun kerusakan bangunan yang di timbulkan cukup banyak, tercatat dampak yang ditimbulkan oleh gempa sebanyak 201 bangunan mengalami kerusakan mulai dari rusak sedang hingga rusak berat. Fakotr penyebab banyaknya bangunan yang mengalami kerusakan adalah karena memiliki kedalaman pusat gempa yang cukup dangkal, yaitu 4 Km menyebabkan intensitas guncangan di purmakaan tanah terasa cukup kuat. Selain dari faktor kedalaman pusat gempa, banyaknya bangunan rumah, sekolah dan masjid yang rusak atau roboh disebabkan karena tidak mengikuti kaidah-kaidah bangunan tahan gempa. Contoh kasus yang ditemukan di lapangan seperti sistem struktur yang kurang menyatu dan kualitas material yang kurang baik. Dilokasi kerusakan ditemukannya inovasi-inovasi masyarakat dalam menekan biaya bangunan seperti pengunaan bambu sebagai pengganti tulangan baja dan ada juga yang mengkombinasikan dalam satu frame struktur menggunakan tulangan bambu dan tulangan baja, namun penerapan bambu sebagai pengganti tulangan oleh masyarakat tidak dibuat dengan praktek yang semestinya. Kata Kunci: Gempa, Kerusakan bangunan, Faktor penyebab.

Deagregasi Hazard Dan Rekomendasi Ground Motion Sintetik Di Provinsi Riau Elvis Saputra; Lalu Makrup
AGREGAT Vol 6, No 1 (2021): Vol.6, No.1 (2021)
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/ag.v6i1.8323

AbstractIndonesia is recorded to have experienced several large earthquakes and caused many casualties. One of the efforts that can be made to reduce the risk of earthquake disasters is to design buildings with an earthquake-resistant concept. In building planning with the concept of earthquake resistance, especially high buildings, time history data is needed in planning earthquake loads. The availability of time history data in Indonesia is still a big problem. To overcome this data limitation, an alternative can be provided by creating a synthetic ground motion. The purpose of this research is to provide time history data in Riau Province which can be used as a reference in designing earthquake loads for building planning. Determination of Uniform Hazard Spectrum (UHS) was carried out using a probabilistic method, followed by spectral matching to obtain synthetic ground motion. The results of this study indicate that the risk of earthquakes is represented in the form of acceleration values in Riau province at UHS which have an acceleration value of 0.27 g at T = 0 seconds, 0.63 g at T = 0.2 seconds, and 0.41 g at T = 1 second. The source of the earthquake that is predicted to have the largest contribution to earthquake risk is the shallow crustal earthquake source, namely the Barumun Fault with a dominance of 63.68%. The results of synthetic ground motion for Riau Province have a maximum acceleration value of 0.26 g. Keywords: Earthquake, probability method (PSHA), synthetic ground motion AbstrakIndonesia tercatat telah mengalami beberapa kali gempa dengan kekuatan yang cukup besar dan menyebabkan banyak korban jiwa. Salah satu upaya yang dapat dilakukan untuk mengurangi risko bencana yang diakibatkan oleh gempa adalah mendesain bangunan dengan konsep tahan gempa. Dalam perencanaan bangunan dengan konsep tahan gempa teurtama gedung tinggi dibutuhkan data time history dalam merencanakan beban gempa. ketersediaan data tim history di Indonesia saat ini masih menjadi kendala. Untuk mengatasi keterbatasan data tersebut, maka diberikan alternatif dengan membuat ground motion sentetik. Tujuan dilakukannya penelitian ini adalah untuk menyediakan data time history rekaman gempa di Provinsi Riau yang dapat jadikan referensi dalam mendesain beban gempa untuk perencanaan gedung. Penentuan Uniform Hazard Spectrum (UHS) dilakukan dengan metode probabilistik, kemudian dilanjutkan dengan melakukan spectral matching untuk mendapatkan ground motion sintetik. Hasil dari penelitian ini diperoleh risiko gempa yang direpresentasikan dalam bentuk nilai percepatan di provinsi Riau pada UHS memiliki nilai percepatan 0.27 g pada T = 0 detik, 0.63 g pada T = 0.2 detik, dan 0.41 g pada T = 1 detik. Sumber gempa yang diprediksi memiliki kontribusi terbesar terhadap risiko gempa adalah sumber gempa shallow crustall yaitu Sesar Barumun dengan dominasi sebesar 63,68%. Hasil Ground motion sintetik untuk Provinsi Riau memiliki nilai percepatan maksimum sebesar 0.26 g.

ANALISIS PERCEPATAN TANAH PERMUKAAN DI WILAYAH RIAU DENGAN METODE PSHA Elvis Saputra; Lalu Makrup; Fitri Nugraheni; Widodo .
TEKNISIA Vol. XXV, No. 1, Mei 2020
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol25.iss1.art5

The western region of Sumatra Island is an area located on the world's active plate margin, which is reflected by the high frequency of earthquake events. An effort to reduce the impact of the earthquake disaster is to conduct a seismic hazard analysis. There have been many studies on seismic hazard in the West Sumatra region. Still, in the surrounding areas such as Riau, which borders directly with the territory, there has never been an earthquake hazard mapping micro zonation. This study aims to determine the value of surface acceleration for various districts or cities in Riau Province, by knowing the amount of surface acceleration, it will be able to identify the areas that have a relatively high level of earthquake risk. The Surface acceleration analysis is done by using the probabilistic Seismic hazard method (PSHA) using The SR Model software. The results of this study are obtained from 12 districts or cities located in Riau in which three areas have a high value of surface acceleration, those are Rokan Hulu regency, Kampar regency), and Kuantan Singingi regency). The amount of surface acceleration in Riau province in the 0.0 second period or peak ground acceleration (PGA) is in the range 0.097 - 0.78 g, then in the 0.2 second period the surface acceleration is in the range 0.204 – 1.943 g, and in the 1 second period of the surface acceleration is in the range 0.176 - 1.155 g.

Studi Identifikasi Mitigasi Bencana Gempa Pada Bangunan Sekolah Dasar Kaligondang Dan Rekomendasi Perbaikan Restu Faizah; Elvis Saputra; Dawam Adhiguna
Rekayasa Sipil Vol 6, No 2 (2017)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar

Gempa 6,3 Skala Richter telah terjadi di Yogyakarta pada tanggal 27 Mei 2006 dan mengakibatkan 5.737 orangmeninggal dunia, 38.423 orang luka-luka dan puluhan ribu orang kehilangan tempat tinggal (Bakornas, 2006).Gempa juga menimbulkan kerusakan pada fasilitas umum seperti sekolah, tempat ibadah, gedung pertemuan danbangunan pemerintah.Penelitian ini mengidentifikasi kelengkapan bangunan Sekolah Dasar di daerah rawan gempa berdasarkanPedoman Teknis Bangunan Sekolah Tahan Gempa (Kemendiknas, 2010). Bangunan sekolah yang dikaji adalahbangunan Sekolah Dasar Kaligondang Sumbermulyo Bambanglipuro Bantul DIY. Data bangunan eksistingdiperoleh dari data sekunder maupun data primer dengan cara wawancara, kuosioner dan pengamatan langsungdi lapangan.Rekomendasi perbaikan mitigasi bencana gempa Sekolah Dasar Kaligondang pada penelitian ini diusulkanmenjadi acuan standar bentuk mitigasi bangunan sekolah di daerah rawan gempa, dilengkapi dengan unsurkesiapsiagaan seperti jalur evakuasi, titik kumpul dan poster-poster kebencanaan. Penelitian ini diharapkan dapatmemberi wawasan kepada para pemangku kepentingan dalam membangun sarana pendidikan yang berwawasankebencanaan, dan dapat dikembangkan untuk Sekolah Dasar di lokasi yang berbeda, atau dikembangkan untukjenis fasilitas umum dan jenis bencana lainnya.

OPTIMALISASI PENGGUNAAN PASIR BESI PENGGANTI AGREGAT HALUS DALAM CAMPURAN BETON MUTU TINGGI Firjatullah Bangkit Aryoputro; Mochammad Teguh; Elvis Saputra
TEKNISIA Vol 27 No 1 (2022): Teknisia
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol27.iss1.art3

Infrastructure progress needs to be supported by the development of research on construction material technology, one of which is concrete technology. With its various advantages, concrete is continuously used to solve infrastructure problems. However, it also has impact on the use of large-scale materials and has the potential to deplete natural resources if not handled properly. One material that can be used as an alternative is iron sand. Iron sand is a mineral resource with magnesium content and has characteristics as a substitute for fine aggregate in concrete mixes. This study aimed to determine the effect of iron sand as a substitute for fine aggregate in high-strength concrete mixtures. This research method was a laboratory experiment by testing the characteristics of high strength concrete, namely compressive strength, tensile strength, and modulus of elasticity. This study found that the optimum concrete compressive strength occurred in the V-02 sample with a result of 51.71 MPa from the design compressive strength (fcr) = 45 MPa. The optimum tensile strength test occurred in the V-02 sample with a result of 4.13 MPa, and the optimum elasticity modulus test occurred in the V-02 sample producing 28684.37 MPa

Perbandingan Peta Percepatan Tanah di Permukaan sebagai Dasar Perencanaan Tata Ruang Berbasis Mitigasi Bencana di Provinsi Riau Elvis Saputra; Fitri Nugraheni; Widodo Pawirodikromo; Lalu Makrup
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 27, Nomor 2, DESEMBER 2021
Publisher : Department of Civil Engineering, Diponegoro University

Spatial planning has an important role in disaster mitigation efforts. The availability of earthquake maps is very useful in spatial planning. The need for spatial planning today is micro spatial planning. Therefore, the 2017 national earthquake map needs to be detailed into a micro zonation map at the district or city scale. The ground acceleration presented in the national earthquake map was the acceleration at bedrock, while in spatial planning it is the necessary acceleration at the surface. Therefore, the purpose of this research was to obtain a map of the earthquake at the surface with a micro-scale. Determination of the acceleration value at the surface was carried out by two models. Model-1, the surface acceleration was obtained by multiplying the results of the PSHA analysis at bedrock by the amplification factor based on SNI-1726. While Model-2, the acceleration value at the surface was directly obtained from the results of PSHA analysis using the average surface shear wave velocity (Vs30) based on data from the USGS. The result of this study showed that from the 2 analytical models used, Model-2 has a higher surface acceleration value than Model-1. Riau Province has 12 districts. in general, the 12 districts were included in the low to moderate risk index class, but there was one district that was close to the high index class, namely Rokan Hulu district.

Development of Spectra Acceleration Map to Seismic Design Category Map In Yogyakarta Province Elvis Saputra
TERAS JURNAL Vol 13, No 1 (2023): Volume 13 No 1, Maret 2023
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v13i1.824

Abstrak Indonesia dikelilingi oleh empat lempeng besar dunia yang bergerak secara konvergen sehingga menyebabkan sering mengalami kejadian gempa. Salah satu upaya mengurangi risiko bencana gempa adalah melakukan upaya mitigasi seperti pembuatan peta bahaya gempa. Penyusunan Peta Kategori Desain Seismik (KDS) Indonesia saat ini masih terkendala karena keterbatasan data penyelidikan tanah. Meskipun demikian, problem tersebut dapat diatasi dengan melakukan pendekatan berdasarkan data kecepatan gelombang geser pada kedalaman 30 (Vs30) yang disediakan oleh (USGS, 2020). Tujuan dari penelitian ini adalah melakukan penyusunan Peta Kategori Desain Seismik untuk Provinsi Daerah Istimewa Yogyakarta (DIY). Tahapan penelitian diawali dengan pengumpulan data, perhitungan percepatan tanah dan penentuan kategori desain seismik untuk setiap titik dari 3759 titik tinjauan. Hasil penyusunan peta kategori desain seismik Daerah Istimewa Yogyakarta pada kategori risiko I, II, dan III menunjukkan hasil Kabupaten Bantul, Kota Yogyakarta masuk dalam kategori risiko tinggi (KDS D), sedangkan Kabupaten Sleman, Kabupaten Kulonprogo, dan Kabupaten Gunung Kidul masuk dalam kategori risiko sedang hingga tinggi (B, C, dan D). Kategori desain seismik pada kategori risiko IV hampir secara keseluruhan kabupaten-kabupaten di Provinsi Daerah Istimewa Yogyakarta masuk dalam Kategori Desain Seismik D yang artinya memiliki tingkat risiko gempa bumi yang tinggi. Kata kunci: Gempa, mitigasi, kecepatan gelombang geser, kategori desain seismik Abstract Indonesia is surrounded by four large plates of the world that move convergently, causing frequent earthquakes. One of the efforts to reduce the risk of earthquake disasters is to carry out mitigation efforts such as making earthquake hazard maps. The compilation of Indonesia's Seismic Design Category Map is currently still hampered due to limited soil investigation data. However, this problem can be overcome by making an approach based on the shear wave velocity data (Vs30) provided by (USGS, 2020). The purpose of this research is to create a Seismic Design Category Map for the Province of the Special Region of Yogyakarta. The research phase begins with collecting data, calculating ground acceleration, and determining the seismic design category for each point of the 3759 review points. The compilation result of seismic design category maps for the Special Region of Yogyakarta in risk categories I, II, and III showed that Bantul Regency, Yogyakarta City were in the high risk category (KDS D), while Sleman Regency, Kulonprogo, and Gunung Kidul fall into the moderate to high-risk category (B, C, and D). The Seismic Design Category Map for risk category IV showed that almost all districts in the Special Region of Yogyakarta Province were Seismic Design Category D, which means it has a high level of earthquake risk. Keywords: Earthquake, mitigation, shear wave velocity, seismic design categories

KARAKTERISTIK OPTIMUM BETON MUTU TINGGI DENGAN PENAMBAHAN SERBUK KACA Ilham Nuruddin; Mochamad Teguh; Elvis Saputra
TEKNISIA Vol 28 No 1 (2023): Teknisia
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol28.iss1.art4

Concrete material innovation is one of the most used in construction nowadays. Along with the infrastructure growth, the amount of waste increases, such as glass waste. The glass waste contains silica and can be used as filler in the concrete mixture. This study aimed to determine the influence of added glass powder as filler on high-strength concrete. This research method was a laboratory experiment testing high-strength concrete to seek optimum characteristics of high-strength concrete based on the glass powder composition added. The optimum concrete characteristics consist of compressive strength, tensile strength, and modulus of elasticity for five samples with different material compositions shown in Table 3, and each sample comprised 6 (six) specimens tested. This study found that the second sample achieved the optimum compressive strength of concrete with 47.07 MPa, more significant than the compressive strength design (fcr) of 45 MPa. The optimum tensile strength produced 3.91 MPa or 8.3%, which correlated to the compressive strength of the BSK2 sample. Similarly, the optimum modulus of elasticity was then computed based on laboratory compressive strength tests referring to SNI 2847:2019 and the ASTM C-469-94, resulting in 33271.7 MPa dan 36164.95 MPa, respectively. In contrast, the modulus elasticity calculated based on the weight volume of concrete referring to SNI 2847:2019 has reached the highest elasticity modulus on the first sample with 34384.8 MPa.

Penyusunan Peta Koefisien Amplifikasi Berdasarkan Rasio Spektra Percepatan Elvis Saputra
Rekayasa Sipil Vol. 17 No. 3 (2023): Rekayasa Sipil Vol. 17 No. 3
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2023.017.03.9

One of the most important parameters in the building structure design process is an amplification coefficient. The amplification coefficient is needed to propagate a spectra acceleration at bedrock to soil surface. The amplification coefficient can be determined by several methods such as MASW Method, HVSR Method and other methods. One alternative method that can be used in determining the amplification coefficient is to determine the ratio between the ground acceleration at the surface and at the bedrock. Therefore, the purpose of this study was to identify the amplification coefficient in the Province of the Special Region of Yogyakarta with the PSHA method analysis approach by utilizing the shear wave velocity data (Vs30). This research method was carried out in 3 stages, namely data collection, acceleration analysis using the PSHA method, and determination of the amplification coefficient based on the acceleration ratio. The results of the study obtained a distribution of the amplification coefficient of the acceleration spectra of 0.2 and 1 second in the DIY province with a maximum value of Fa amplification coefficient was 1.414 on hard soil conditions and 1.653 on medium soil conditions. The maximum Fv amplification coefficient was 1.508 on hard soil conditions and 1,923 on medium soil conditions.

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