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All Journal Jurnal Teknik Borneo Engineering: Jurnal Teknik Sipil Journal of the Civil Engineering Forum Indonesian Journal of Construction Engineering and Sustainable Development
Iman, Miftahul
Jurusan Teknik Sipil
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Pengaruh Perbedaan Elevasi Muka Air Tanah Pada Pondasi Telapak Berdasarkan Studi Numerik Iman, Miftahul; Aminullah, Aminullah
Borneo Engineering : Jurnal Teknik Sipil 2019: Volume 3, Nomor 1, Juni 2019
Publisher : Jurusan Teknik Sipil

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (437.816 KB)

Abstract

The south Kalimantan Province has various soil characteristic, the difference of ground water level included . Experimental modeling of foot plate foundations in various ground water level is too difficult to be performed. There were so many variables that need to be evaluated in the modeling. The numerical model was based on finite element method such in Abaqus allowed the modeling of foot plate foundations with the various of ground water level. This study modeled the foot plate foundation structure where located on various ground water level by giving variations of the effect of water level to the elevation of the foundation. Water level variations are determined successively below the foundation elevation, the same as the foundation elevation and above the foundation elevation. The analysis performed is static structure analysis with idealization of 2D shell idealization. The result of the research showed that the ground water level effect the stress and deformation of soil closed to foundation elevation. The stress had been evaluated at the base of the foundation for each ground water level difference correspondently 16,53 MPa, 9.34 MPa and 3.59 MPa. The lowest stresses was occured in ground water elevation above the foundation elevation (78.28%).
Analisa Manajemen Risiko proyek di daerah 3T (Terluar–Terdepan–Tertinggal). Studi Kasus Pembangunan Jalan di Pulau Siberut, Kep. Mentawai, Sumatera Barat Iman, Miftahul; Ferry Rusgiyarto
Jurnal Teknik: Media Pengembangan Ilmu dan Aplikasi Teknik Vol 24 No 1 (2025): Jurnal Teknik - Media Pengembangan Ilmu dan Aplikasi Teknik
Publisher : Fakultas Teknik - Universitas Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55893/jt.vol24no1.722

Abstract

Pelaksanaan proyek di daerah 3T memiliki karakteristik tersendiri disebabkan kondisi geografis proyek yang menyebabkan sulitnya mobilisasi alat, material, dan tenaga. Penelitian ini bertujuan mencari risiko dominan pada pelaksanaan proyek di daerah 3T. Metode penelitian dilakukan dengan melakukan kuesioner kepada 56 responden, dengan responden dibagi berdasarkan pernah atau tidaknya mereka melaksanakan proyek di daerah 3T, instansi asal responden (dinas bina marga, kontraktor, konsultan), pendidikan responden, dan lokasi pekerjaan dominan responden (Jawa, luar Jawa). Langkah pertama dari penelitian  adalah melakukan uji validitas dan reliabilitas kuesioner, dilanjutkan dengan skoring probabilitas, dampak dan tingkat risiko yang didapat dari hasil kuesioner dengan perhitungan Severity Index, selain itu juga dilihat kecenderungan jawaban responden berdasarkan klasifikasi responden. Hasil penelitian menunjukkan bahwa responden yang pernah melaksanakan proyek di daerah 3T,  responden yang berasal dari kontraktor, berpendidikan S1,  dan lokasi pekerjaan dominan di luar Jawa, cenderung menilai bahwa risiko melaksanakan pekerjaan di daerah 3T cukup tinggi dibanding responden lain. Penelitian juga menunjukkan bahwa pekerjaan di daerah 3T memiliki tingkat risiko dari sedang sampai sangat tinggi.
Cold-Formed Steel Truss Roof Structure Failure Considering Seismic Load and Buckling Analysis Muslikh; Iman, Miftahul
Journal of the Civil Engineering Forum Vol. 12 No. 1 (January 2026)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.13069

Abstract

There were many incidents of cold-formed steel roof truss structures in the last 5 years in Indonesia. Various kinds of allegations have been addressed to cold-formed steel material applications especially in the case of seismic resistance. Some of them concern the authenticity of the steel material itself and the selection of cold formed steel material. On the other hand, recently, people have installed (assembled) cold-formed steel trusses without involving a certified cold-formed steel applicator. This research is based on a numerical study that modeled the collapse pattern of cold-formed steel truss roof structures by considering buckling failure and the seismic load capacity. The cold-formed steel roof truss structure was modeled with 3D-truss elements in two model types: the overall structure and a single compression member element in 3D solid idealization. Buckling analysis with eigenvalue and nonlinear static analysis was performed to evaluate the critical load (Pcr). The buckling mode shape also was also compared with the mode shape of modal analysis. This research also evaluated the effect of seismic load on the overall cold-formed steel truss structure and the slenderness of the compression member. The numerical simulation of cyclic loading on the single compression member was conducted in this research. The numerical analysis results showed that cold-formed steel roof truss structure have high vulnerability to seismic hazard effect. The cold-formed steel material has lower ductility than hot rolled steel material. This causes the lateral displacement that occurs to be lower than the displacement produced by the hysteretic curve of numerical cyclic simulation. This research also evaluated the dynamic properties, such as frequency, periods, and mode shapes, of some typical cold-formed steel for roof truss structure.
STEEL ROOF STRUCTURE STRENGTH ANALYSIS USING 2D FINITE ELEMENT METHOD Iman, Miftahul; Nelfia, Lisa Okri; Manurung, Edison Hatoguan
INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD) Vol 6 No 2 (2023): INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD)
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/cesd.v6i2.18894

Abstract

Due to the time, the steel truss had been used in several roof application. Several analysis structure methods codes had been developed and adopted for steel building constructions design and analysis. Recently, some finite element analysis also had completed the structure analysis. This research had modelled and analyzed the howie type of roof steel truss structure. The direct stiffness method had been compared to the finite element method (FEM) that was utilized by SAP2000. The stress analysis had been evaluated by performing 3D solid tension and compression member by utilizing Abaqus. The National Standard of Indonesia for steel construction (SNI 1729 2020) that was also verified by AISC/ANSI 360 2022 had been considered in this research. The results showed similarity between Direct Stiffness Method and FEM about 1% - 2%. The maximum tension stress on bottom chord had been verified by 3D solid respectively 175 MPa (ASD) and 213 MPa (LRFD) for yielding criteria. For fracture criteria the stress was recorded consecutively 140 MPa (ASD) and 260 MPa (LRFD). The compression member had been recorded correspondently 267 MPa (ASD) and 270 MPa (LRFD). The stress number that was occurred on the top chord had satisfied the design requirements accorded to AISC/ANSI 360-2022. However, in the case of compression member should be designed in double cross section for preventing the buckling failure.
Co-Authors Aminullah Aminullah, Aminullah Ferry Rusgiyarto Manurung, Edison Hatoguan Muslikh Nelfia, Lisa Okri