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All Journal Journal of Engineering and Technological Sciences Jurnal Teknik Sipil Simposium II UNIID 2017 The Jurnal Arsip Rekayasa Sipil dan Perencanaan (Journal of Archive in Civil Engineering and Planning) Aceh International Journal of Science and Technology Jurnal Teknik Sipil Journal of The Civil Engineering Student

Halida Yunita

Department Of Civil Engineering, Syiah Kuala University

Author-ID : 2847868

Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Engineering Transportation

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An Overview of Soil Models for Earthquake Response Analysis Yunita, Halida; Hendriyawan, H.; Apriadi, Dedi
Journal of Engineering and Technological Sciences Vol 47, No 1 (2015)
Publisher : ITB Journal Publisher, LPPM ITB

Earthquakes can damage thousands of buildings and infrastructure as well as cause the loss of thousands of lives. During an earthquake, the damage to buildings is mostly caused by the effect of local soil conditions. Depending on the soil type, the earthquake waves propagating from the epicenter to the ground surface will result in various behaviors of the soil. Several studies have been conducted to accurately obtain the soil response during an earthquake. The soil model used must be able to characterize the stress-strain behavior of the soil during the earthquake. This paper compares equivalent linear and nonlinear soil model responses. Analysis was performed on two soil types, Site Class D and Site Class E. An equivalent linear soil model leads to a constant value of shear modulus, while in a nonlinear soil model, the shear modulus changes constantly,depending on the stress level, and shows inelastic behavior. The results from a comparison ofÂ both soilÂ modelsÂ areÂ displayed in the form of maximum acceleration profiles and stress-strain curves.

Development of Pre-consolidation Pressure Dependence of Mixed Hardening Multisurface Hyperplasticity Model for Better Prediction of Earthquakes Ground Response Analysis Apriadi, Dedi; Yunita, Halida; Likitlersuang, Suched; Pipatpongsa, Thirapong
Jurnal Teknik Sipil Vol 18, No 3 (2011)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (688.688 KB)

Abstract. It was known that soil behavior is dependent upon the history of loading and exhibits hardening behavior when deformed plastically. This paper presents a formulation of mixed hardening multisurface hyperplasticity model with stiffness factors of the kinematic hardening of the yield surfaces proportional to the pre-consolidation pressure to represent the history of loading. Formulation is emphasized for describing the cyclic loading behavior of clay soils. The advantages of this approach are that it can reproduce smooth transitions from elastic to plastic behavior and allows the stress-reversal history to be memorized by the internal variable function. The Modified Cam Clay yield function is selected as a key model to simulate the stress-strain response. The incremental stressâstrain response is calculated based on a rate-dependent formulation. Finally, this paper describes the importance of development of the formulated soil model to improve current constitutive models for evaluating the effects of local soil conditions on earthquake ground response analysis. Further results of numerical implementation and simulations and also model verification employing the proposed mathematical model formulation will be reported in a future publication. Abstract. Telah diketahui bahwa perilaku tanah akan tergantung dari sejarah pembebanannya dan juga memperlihatkan perilaku hardening apabila tanah mengalami deformasi secara plastik. Tulisan ini menyajikan sebuah formulasi model tanah mixed hardening multisurface hyperplasticity dengan faktor kekakuan kinematik hardening proporsional terhadap tekanan pra-konsolidasi guna merepresentasikan sejarah pembebanan yang terjadi pada tanah. Formulasi ditekankan untuk mendeskripsikan perilaku pembebanan siklik pada tanah lempung. Kelebihan dari pendekatan model hyperplasticity ini adalah dapat menghasilkan transisi dari perilaku elastik ke plastik secara smooth serta mampu âmengingatâ sejarah perubahan tegangan yang terjadi pada tanah dengan menggunakan fungsi variabel internal. Fungsi leleh Modified Cam Clay dipilih sebagai model utama untuk mensimulasikan respons tegangan-regangan. Selanjutnya, respons tegangan-regangan dihitung berdasarkan sebuah formulasi rate-dependent. Terakhir, tulisan ini mendeskripsikan pentingnya pengembangan model ini guna memperbaiki analisis respons tanah akibat gempa. Hasil-hasil lebih lanjut berupa implementasi dan simulasi numerik serta juga verifikasi model yang diusulkan akan disajikan dalam publikasi berikutnya.

KAJIAN POTENSIAL LIKUIFAKSI AKIBAT GEMPA BERDASARKAN DATA SPT-N DI WILAYAH PROVINSI ACEH Munirwansyah Munirwansyah; Halida Yunita; Reza P. Munirwan
Simposium II UNIID 2017 Vol 2 (2017)
Publisher : Simposium II UNIID 2017

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (611.245 KB)

Provinsi Aceh merupakan wilayah yang rawan gempa. Gempa Aceh 26 Desember 2004 dan 7 Desember 2016 telah mengakibatkan terjadinya likuifaksi di beberapa tempat. Likuifaksi telah banyak menjadi penyebab dari kerusakan bangunan dan sarana infrastruktur. Sehingga perlu dikaji potensi likuifaksi di daerah pesisir yang banyak terdapat pemukiman penduduk, bangunan bertingkat dan infrastuktur. Kajian potensi likuifaksi menggunakan data N-SPT, dilakukan dengan menggunakan MetodeKishida (1969), Metode Whitman (1971), serta Metode Valera dan Donovan (1977). Magnitude gempa yang diterapkan adalah 6 SR, 8 SR dan 9 SR. Metode Kishida (1969) memberikan hasil bahwa untuk magnitude gempa 6 SR, 8 SR dan 9 SR tidak berpotensi likuifaksi pada lapisan 3m – 21m. (1971) pada magnitude gempa 6 SR tidak mengalami likuifaksi pada tiap lapisan tanah. Sedangkan Metode Valera dan Donovan (1977) semua lapisan tanah mengalami likuifaksi pada setiap magnitude gempa kecuali pada kedalaman 3m. Gabungan dari ketiga metode di atas memberikan hasil bahwa seluruh lapisan berpotensi likuifaksi kecuali pada lapisan 3 m dengan magnitude gempa 6 SR Dengan demikian pembangunan gedung dan infrastruktur di daerah Pesisir Utara Aceh Provinsi Aceh perlu didahului dengan usaha perbaikan tanah untuk mengantisipasi fenomena likuifaksi.

An Overview of Soil Models for Earthquake Response Analysis Halida Yunita; H. Hendriyawan; Dedi Apriadi
Journal of Engineering and Technological Sciences Vol. 47 No. 1 (2015)
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.2015.47.1.5

Earthquakes can damage thousands of buildings and infrastructure as well as cause the loss of thousands of lives. During an earthquake, the damage to buildings is mostly caused by the effect of local soil conditions. Depending on the soil type, the earthquake waves propagating from the epicenter to the ground surface will result in various behaviors of the soil. Several studies have been conducted to accurately obtain the soil response during an earthquake. The soil model used must be able to characterize the stress-strain behavior of the soil during the earthquake. This paper compares equivalent linear and nonlinear soil model responses. Analysis was performed on two soil types, Site Class D and Site Class E. An equivalent linear soil model leads to a constant value of shear modulus, while in a nonlinear soil model, the shear modulus changes constantly,depending on the stress level, and shows inelastic behavior. The results from a comparison of both soil models are displayed in the form of maximum acceleration profiles and stress-strain curves.

Development of Pre-consolidation Pressure Dependence of Mixed Hardening Multisurface Hyperplasticity Model for Better Prediction of Earthquakes Ground Response Analysis Dedi Apriadi; Halida Yunita; Suched Likitlersuang; Thirapong Pipatpongsa
Jurnal Teknik Sipil Vol 18 No 3 (2011)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2011.18.3.4

Abstract. It was known that soil behavior is dependent upon the history of loading and exhibits hardening behavior when deformed plastically. This paper presents a formulation of mixed hardening multisurface hyperplasticity model with stiffness factors of the kinematic hardening of the yield surfaces proportional to the pre-consolidation pressure to represent the history of loading. Formulation is emphasized for describing the cyclic loading behavior of clay soils. The advantages of this approach are that it can reproduce smooth transitions from elastic to plastic behavior and allows the stress-reversal history to be memorized by the internal variable function. The Modified Cam Clay yield function is selected as a key model to simulate the stress-strain response. The incremental stress"“strain response is calculated based on a rate-dependent formulation. Finally, this paper describes the importance of development of the formulated soil model to improve current constitutive models for evaluating the effects of local soil conditions on earthquake ground response analysis. Further results of numerical implementation and simulations and also model verification employing the proposed mathematical model formulation will be reported in a future publication. Abstract. Telah diketahui bahwa perilaku tanah akan tergantung dari sejarah pembebanannya dan juga memperlihatkan perilaku hardening apabila tanah mengalami deformasi secara plastik. Tulisan ini menyajikan sebuah formulasi model tanah mixed hardening multisurface hyperplasticity dengan faktor kekakuan kinematik hardening proporsional terhadap tekanan pra-konsolidasi guna merepresentasikan sejarah pembebanan yang terjadi pada tanah. Formulasi ditekankan untuk mendeskripsikan perilaku pembebanan siklik pada tanah lempung. Kelebihan dari pendekatan model hyperplasticity ini adalah dapat menghasilkan transisi dari perilaku elastik ke plastik secara smooth serta mampu "mengingat" sejarah perubahan tegangan yang terjadi pada tanah dengan menggunakan fungsi variabel internal. Fungsi leleh Modified Cam Clay dipilih sebagai model utama untuk mensimulasikan respons tegangan-regangan. Selanjutnya, respons tegangan-regangan dihitung berdasarkan sebuah formulasi rate-dependent. Terakhir, tulisan ini mendeskripsikan pentingnya pengembangan model ini guna memperbaiki analisis respons tanah akibat gempa. Hasil-hasil lebih lanjut berupa implementasi dan simulasi numerik serta juga verifikasi model yang diusulkan akan disajikan dalam publikasi berikutnya.

ANALISIS BENTUK GEOMETRI TERHADAP STABILITAS LERENG PADA TAMBANG TERBUKA DARI ASPEK GEOTEKNIK Lisa Fianti; Munirwansyah Munirwansyah; Halida Yunita
Jurnal Arsip Rekayasa Sipil dan Perencanaan Vol 3, No 2 (2020): Jurnal Arsip Rekayasa Sipil dan Perencanaan
Publisher : Prodi Magister Teknik Sipil Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jarsp.v3i2.16567

Aceh Province is one of the coal producers, especially Sumber Batu Village in Meurebo District, West Aceh Regency. In the implementation of coal mining, it is necessary to pay attention to the slope stability of open-pit mining to identify and estimate the possibility of landslides. For this reason, the author conducted research in analyzing the geometric shape of the slope stability with the slope variance of modeling the reduction of the existing angle αeks - 10% to the depth of three layers of soil 11 meters. The 1st layer of soil is 1.5 meters, the second layer of soil is 2.5 meters, and the third layer of soil is 7 meters. Slope stability is strongly influenced by the geometric shape of the slope and the strength of soil parameters. To identify the stability of the slope against slope failure, computationally performed using the finite element method with Plaxis software as the reference for the value of FK 1.25, which is considered safe/stable, meaning that collapse rarely occurs. In this research, primary data is used in the form of direct observation in the field, namely taking soil samples to obtain soil data in the form of soil physical properties and soil mechanical properties into soil parameter data, which is tested in the soil laboratory. Secondary data used are map data, boring data, and Sondir data. Soil parameter data were processed using Plaxis software. The results of the slope stability analysis showed that by modeling the geometric shape of the slope (αeks - 10%) on the open slope of a coal mine with a soil depth of 11 meters, the FK value was 3.60. From the results of the FK scores, it shows that the slope of the slope is 3.60 1.25 above the reference value of safe/stable FK. The FK value is 0.2 greater than the FK existing geometry. The conclusion of this study is that geometric shapes play an important role in determining the stability of an open coal pit excavation slope. The smaller the slope angle, the greater the FK value obtained, or the more gentle the slope, the higher the safety value of a slope.

ANALISIS PERENCANAAN BUKIT BUATAN (ESCAPE HILL) TERHADAP TINGGI RUN UP UNTUK TEMPAT EVAKUASI SEMENTARA Windy Widilestari; Munirwansyah Munirwansyah; Halida Yunita
Jurnal Arsip Rekayasa Sipil dan Perencanaan Vol 2, No 3 (2019): Jurnal Arsip Rekayasa Sipil dan Perencanaan
Publisher : Prodi Magister Teknik Sipil Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jarsp.v2i3.13463

As we know, there is still a lack of the optimal effort for temporary evacuation sites to face the various threats of the earthquake which may caused the tsunami in the city of Banda Aceh. To deal with this serious threat, it is necessary to prepare a place of salvation to face the tsunami. In this case, it is an escape hill. The objective of this research is to determine the bearing capacity of the subgrade to the escape hill planning and the amount of the settlement, due to the load of the embankment height (Hcrit) and the value of the slope safety factor (FK). This research is conducted in Desa Deah Baro with the GCS coordinates (Geographic Coordinate System) 5º33'45.72"N 95º17'51.34"E which was calculated by using the Plaxis 8.2 computing system on the variations of the embankment height which started from the existing which is 2,0 m height, 4,0 m, 6,0 m, 8,0 m, 10 m and 12 m (run-up performance). As the results of analysis, the researcher found that the addition of the load due to the increase in soil embankment height has resulted in an increase in the value of settlement to the soil stability with an average percentage of 2,86% and the safety factor decreasing value (FK) numbers on slopes with an average percentage of 0,10%. At 2,0 m embankment heights, the researcher obtained a settlement value of 0,271 cm with the safety factor value (FK) is 1,684 greater than 1. Furthermore, with the embankment height of 4,0 m, there is a settlement of 1,139 cm dan safety factor (FK) 1,365 greater than 1. At a embankment height of 6.0 m there is a settlement of 3,035 cm and a safety factor (FK) 1,214 greater than 1. At embankment heights of 8,0 m, the settlement is 6,244 cm with a safety factor (FK) 1,135 greater than 1. For embankment heights of 10 m and 12 m, the decrease occurred was 10,991 cm and 17,446 cm with safety factor (FK) = 1,095 and 1,044~1. The occured decline was still within the tolerance limits, so that the subgrade was still able to withstand the embankment. The results of the value of the safety factor (FK) showed that the slope was safe and did not indicate the slope slides.

ANALISIS KERENTANAN TANAH TERHADAP BAHAYA LIKUIFAKSI BERDASARKAN DATA PENGUJIAN SPT Muhammad Kautsar Rizki; Halida Yunita; Bambang Setiawan; Zulkifli Zulkifli
Jurnal Arsip Rekayasa Sipil dan Perencanaan Vol 4, No 4 (2021): Jurnal Arsip Rekayasa Sipil dan Perencanaan
Publisher : Prodi Magister Teknik Sipil Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jarsp.v4i4.25575

Aceh is a province in Indonesia that was hit significantly by the 26 December 2004 disaster. The province was also hit by the M 6.5 Pidie Jaya earthquake on 7 December 2016. Several damages induced by liquefaction, i.e., sand boils, were observed in these two seismic events. Liquefaction is defined as the transformation of granular material from a solid to a liquefied state. This Liquefaction phenomenon can cause damage to buildings and infrastructures built on it. This study presents the results of liquefaction assessment using the standard penetration test (SPT). A borehole was sunk at Rundeng Village, Johan Pahlawan sub-distrit, Aceh Barat distrit to collect the SPT data. This location was selected as several facts, i.e., low water table, built of sand layer, and high seismicity region were suggested for this Rundeng village. Three different models of Esteva (1974), Donovan (1970), and Mc Guirre (1977) were used to estimate the cyclic stress ratio (CSR). A model developed by Seed and Idriss (1982) was employed to estimate the cyclic resistance ratio (CRR). From the calculation of potential liquefaction evaluation, the cyclic stress ratio (CSR) value highly depends on the earthquake magnitude. The greater the earthquake magnitude, the greater the CSR value becomes. Soil layers from SPT data at a depth of 3,50 m – 13,00 m have a value of (N1)60cs 30 which means the soil is too dense to liquefy and classified as non-liquefiable soil. From the SPT data, it can be seen the soil will be liquefied if an earthquake with a magnitude ≥ 8 occurs.

Spatially Distribution of Soil Ultimate Bearing Capacity at Singkil-Aceh Based on a Static Cone Penetration Test Halida Yunita; Nafisah Al Huda; Devi Sundary; Hendra Gunawan; Munira Sungkar; Bambang Setiawan; Dewi Sartika
Aceh International Journal of Science and Technology Vol 11, No 1 (2022): April 2022
Publisher : Graduate Program of Syiah Kuala University

The Singkil Sub-district of Aceh Singkil District comprises alluvium deposits with a relatively low ultimate bearing capacity. The ultimate bearing capacity of the soil is closely related to the safety of a building. The important thing related to estimating the ultimate bearing capacity of the soil is in-situ soil investigation. This study aims to estimate the spatial distribution of soil ultimate bearing capacity using field test data in the Singkil Sub-district. Estimating ultimate bearing capacity is useful to provide an initial picture for various planning and infrastructure development activities in the study area. Twenty CPT in-situ tests have been obtained from various field works in Aceh Singkil Regency. Field data analysis, based on empirical methods, was carried out to obtain the value of the ultimate bearing capacity of the soil at the test location. Then, the estimated distribution of the maximum bearing capacity obtained was carried out. The zoning map of the distribution of soil ultimate bearing capacity in the study was developed from this research. This map can be used as a form or effort of disaster mitigation by various stakeholders involved in planning and building various infrastructure facilities in the Singkil Sub-district

KAJIAN KESTABILAN LERENG GALIAN TAMBANG TERBUKA BERDASARKAN ASPEK GEOTEKNIK DAN KESELAMATAN KERJA (STUDI KASUS PERTAMBANGAN BATUBARA PT. MIFA BERSAUDARA DI KECAMATAN MEUREBO KABUPATEN ACEH BARAT) Dian Febrianti; Munirwansyah Munirwansyah; Halida Yunita
JURNAL TEKNIK SIPIL Vol 5, No 2 (2016): Volume 5, Nomor 2, Januari 2016
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

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

Abstract : Accident caused by the instability of slope have an impact on the safety of mineworkers, equipment, company, and the environment. That may lead to a loss of company and hinder the production process of minerals. This research is conducted to assess the stability of the slope in the coalmines excavations located in the excavated area Pit B at the area of Desa Sumber Batu, Meurebo District, West Aceh which is owned by PT Mifa Bersaudara. This research uses two methods for comparison, those are Limit Equilibrum calculated manually, and Plaxis with computing system aimed to describe the pattern of slope collapse. The use of both methods may solve the problem of slope stability easily and accurately to meet the security requirements of slope stability. In this research, there are two variants of model that is a variant of shear angle (θ) and variant of cohesion (c). The results of analysis by using LEM (Limit Equilibrum) and Plaxis program on slope excavation of coalmine produce two variants of model namely shear angle variant (θ) and variant of cohesion (c).the shear angle variant model shows that the smaller the slope angle of escarpment (α), then the value of safety factor obtained will be greater. While the result of analysis by using variant cohesion shows that the smaller the angle of slope of the escarpment, the value of safety factor will also be greater. The conclusion derived from this research is that the planning of an open pit excavation, the angle of slope of escarpment should be made as declivitous as possible to reduce the slide of the slope excavation Abstrak: Kecelakaan yang diakibatkan oleh ketidakstabilan lereng akan berdampak pada keselamatan pekerja, peralatan, perusahaan dan lingkungan. Hal ini dapat menyebabkan kerugian bagi perusahaan dan menghambat proses produksi bahan galian. Penelitian ini dilakukan untuk mengkaji kestabilan lereng galian tambang batubara yang terletak di area galian Pit B di wilayah Desa Sumber Batu, Kecamatan Meurebo, Kabupaten Aceh Barat milik PT Mifa Bersaudara. Pada penelitian ini menggunakan dua metode sebagai pembanding yaitu metode LEM (Limit Equilibrum) yang dihitung secara manual dan Plaxis dengan sistim komputasi. Penggunaan kedua metode tersebut telah memberikan kemudahan dan keakuratan dalam pemecahan masalah kestabilan lereng untuk memenuhi persyaratan keamanan kestabilan lereng. Pada penelitian ini terdapat dua varian pemodelan yaitu varian sudut geser (θ) dan varian kohesi (c). Pada pemodelan varian sudut geser (θ) memberikan hasil bahwa semakin kecil sudut kemiringan lereng (α) maka nilai faktor keamanan yang diperoleh akan semakin besar, begitu juga pada varian kohesi (c) semakin kecil sudut kemiringan lereng (α) maka nilai faktor keamanan yang didapat akan semakin besar. Kesimpulan yang dapat di ambil dari penelitian ini adalah dalam perencanaan galian tambang terbuka sudut kemiringan pada lereng dibuat selandai mungkin untuk mengurangi kelongsoran pada lereng galian.

Co-Authors Ani Safitri Bambang Setiawan Bambang Setiawan Bambang Setiawan Banta Chairullah Cut Lutfia Khalisa Cut Sitti Rafidatul Hildayani Dedi Apriadi Dedi Apriadi Dedi Apriadi Devi Sundary Dewi Sartika Dhanni Riyanda Dian Febrianti Evidasari . . Fauzan Mufid H. Hendriyawan H. Hendriyawan Hendra Gunawan Lisa Fianti Muhammad Kautsar Rizki Munira Sungkar Munirwansyah Munirwansyah Munirwansyah Munirwansyah Munirwansyah Munirwansyah Munirwansyah Munirwansyah Nafisah Al Huda Nasyiratun Mona Reza P. Munirwan Suched Likitlersuang Suched Likitlersuang, Suched Thirapong Pipatpongsa Thirapong Pipatpongsa, Thirapong Windy Widilestari Zulkifli Zulkifli

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