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All Journal Teknisia AGREGAT JOURNAL OF CIVIL ENGINEERING, BUILDING AND TRANSPORTATION Prosiding Seminar Nasional Teknik Sipil UMS Jurnal Teknik Sipil
Mushthofa, Malik
Jurusan Teknik Sipil, Fakultas Teknik Sipil Dan Perencanaan, Universitas Islam Indonesia
Civil Engineering, Building, Construction & Architecture Engineering Transportation

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SIMULASI NUMERIK FINITE ELEMENT METHOD (FEM) UNTUK OPTIMALISASI PENAMPANG U-DITCH 2 m TERHADAP PELAKSANAAN HANDLING Malik Mushthofa
TEKNISIA Vol. XXIV, No. 2, November 2019
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.vol24.iss2.art4

Abstract

Increasing of precast concrete usage in many sectors automatically spur fabricators to improve their products quality. Related to that, the application of u-ditch type 2 m domestic product, during product handling (when concrete was 7 hours old) many cracks occurs at the section. Therefore, this optimization aim to improve the product quality. In addition, this optimization also supports to increase production capacity due to the reinforcement volume. The results obtained from FEM simulation, stress distribution is more favorable in the modified cross section. Stress distribution of the section inner corner (cracks zone of existing section), turn from tension become compression and then turn again to tension. Meanwhile, modified section give different stress distribution, stress transition from compression turn back again to tension not happen here. While the evaluation due to the strain value, the modified cross section gives a smaller strain value than the existing cross section strain. In addition, this optimization results in a decrease in reinforcement volume by 10.54%.
SEBARAN GEMPA UTAMA BERDASARKAN MAGNITUDO DAN KEDALAMAN DI WILAYAH MAMUJU DAN SEKITARNYA Wisnu Erlangga; Mochamad Teguh; Malik Mushthofa; Imam Trianggoro Saputro; Gunawan Setiadi
TEKNISIA Vol 27 No 2 (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.iss2.art6

Abstract

Sulawesi is one of Indonesia's large islands with a high vulnerability to earthquakes due to its geographical location, which lies between the confluence of tectonic plates and several active faults. The earthquake events' intensity was relatively high with small to large magnitudes. One area recently hit by a large earthquake that caused material losses and casualties was found in Mamuju. Given this condition, it is essential to determine the latest seismicity mitigation in the Mamuju area and its surroundings to look at the distribution of the mainshock based on the magnitude and depth of the earthquake. Earthquakes that occur in a particular area and for a certain period can describe the concentration of earthquake activity. The earthquake data activity used in this study is to find earthquake data for the period 1960-2021, followed by a declustering process which is carried out to separate the mainshock from the aftershocks. Separating the mainshock from the aftershocks is performed using the time window and distance windows criteria. Based on the analysis, it was found that the number of mainshocks that occurred in the Mamuju region was 20.11% of the total earthquake events that occurred (5366 earthquake event data) with a dominance of moderate to large magnitude (4<M<6). Meanwhile, based on the depth of the earthquake, 54.19% of the earthquake event were shallow earthquakes (0 km < D < 60 km). This can be used as a basis for updating existing earthquake maps and for paying attention to the application of earthquake-resistant building regulations and building construction permits in the Mamuju area, considering that the vulnerability to earthquakes in this area is relatively high.
KONTRIBUSI NORMALISASI HYSTERETIC ENERGY TERHADAP DAMAGE INDEX DI PADA RESPONS INELASTIK STRUKTUR SDOF AKIBAT GEMPA Widodo; Malik Mushthofa
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.art6

Abstract

At a relatively large earthquake ground acceleration, the response of the structure is no longer elastic but is already in the inelastic phase where hysteretic energy is one of the elements of the earthquake energy content. In this phase, structural damage can not be avoided and structural damage is generally expressed in term of damage index DI. Studies on the contribution of normalization of hysteretic energy to the SDOF structure have been carried out. The inelastic behavior of the structure is simulated according to the behavior of Modified Takeda hysteretic model. In this study, two variables were used, namely the earthquake frequency content which is expressed in term of A/V ratio and the vibration period of the structure T. The results showed that the lower the value of the A/V ratio tends to result in a greater damage index DI, both for relatively rigid structures and for relatively flexible structures. The more flexible a structure tends to experience a greater damage index DI both for earthquakes high, medium and low frequency. The contribution of normalization of hysteretic energy to the damage index DI ranges from 10-30%, and the more flexible the structure, the contribution of normalization of hysteretic energy will be smaller. Furthermore, there is also a tendency that the lower the earthquake frequency content, the smaller the contribution of normalized hysteretic energy will accordingly.
PERBANDINGAN RESPON SEISMIK SISTEM RANGKA PEMIKUL MOMEN BIASA DAN MENENGAH PADA GEDUNG SIMETRIS DUA ARAH Tegar Fadillah; Malik Mushthofa
JOURNAL OF CIVIL ENGINEERING BUILDING AND TRANSPORTATION Vol. 8 No. 1 (2024): JCEBT MARET
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jcebt.v8i1.11588

Abstract

Penelitian ini membahas tentang perbandingan kinerja struktur terhadap respons seismik antara metode Sistem Rangka Pemikul Momen Biasa (SRPMB) dan Sistem Rangka Pemikul Momen Menengah (SRPMM) pada bangunan pendidikan 7 lantai di Kota Balikpapan, Kalimantan Timur. Metode penelitian menggunakan teknik pengumpulan data primer dan sekunder serta permodelan 3D dengan software SAP2000. Analisis meliputi analisis statik ekuivalen dan analisis dinamik respon spektrum, dengan memperhitungkan pembebanan sesuai dengan standar SNI. Hasil perhitungan menunjukkan bahwa gedung dengan metode SRPMM memiliki berat bangunan lebih ringan dibandingkan dengan SRPMB, namun gaya geser dasar pada SRPMM lebih rendah dari SRPMB. Hal ini disebabkan oleh nilai koefisien modifikasi respons dan faktor pembesaran simpangan lateral yang berbeda antara kedua metode. Dalam hal pergerakan lateral, gedung dengan metode SRPMM menunjukkan simpangan yang lebih besar daripada SRPMB. Hal ini disebabkan oleh faktor pembesaran simpangan lateral yang lebih tinggi pada SRPMM. Meskipun demikian, keduanya masih memenuhi persyaratan kestabilan struktur yang ditetapkan dalam SNI 1726:2019. Dengan demikian, dalam memilih metode sistem rangka pemikul momen untuk bangunan gedung, perlu dipertimbangkan aspek-aspek seperti berat bangunan, gaya geser dasar, dan simpangan lateral. Penelitian ini memberikan pemahaman yang lebih baik tentang perbandingan kinerja antara SRPMB dan SRPMM, yang dapat menjadi pedoman dalam proses perencanaan dan desain struktur bangunan gedung di daerah dengan risiko gempa yang tinggi seperti Indonesia.
Numerical Investigation of Steel Section Remaining Tensile Capacity During SMAW Welding Mushthofa, Malik
AGREGAT Vol 9 No 1 (2024)
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/ag.v9i1.22374

Abstract

This study investigates a method for calculating the remaining axial tension capacity of thin steel sections during Shielded Metal Arc Welding (SMAW) under load. This necessitates a method to address situations where welding operations must be performed on structures already experiencing stress. Thin sections are particularly susceptible to the elevated temperatures associated with welding. To address this challenge, simulations were utilized to model the effect of the welding heat on thin sections. The simulations considered the temperature rise experienced by each segment within the section. This rise led to a reduction in yield strength, ultimate strength, and elastic modulus for each segment. Subsequently, the partial tension capacity for each segment was calculated based on its area and the reduced strength properties. Finally, the remaining axial tension capacity was determined by summing the tension capacities of all segments. The results revealed a noteworthy correlation between welding parameters and the remaining tension capacity. Higher welding currents were associated with a greater loss of tension capacity, while faster welding speeds resulted in minimizing this loss. The scenario employing the lowest welding current and highest welding speed yielded the most favorable outcome, with the remaining tension capacity reaching 76%, 85%, and 89% for sections of 40.40.4, 50.50.5, and 60.60.6, respectively. Conversely, employing the highest welding current and slowest welding speed significantly reduced the remaining axial tension capacity until there were only 28%, 50%, and 66% left for the respective sections.
NUMERICAL ANALYSIS OF STEEL MEMBER REMAINING COMPRESSIVE CAPACITY DURING SHIELDED METAL ARC WELDING Mushthofa, Malik; Hardawati, Astriana
JURNAL TEKNIK SIPIL Vol 13, No 1 (2024): Volume 13 Nomor 1 Mei 2024
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jts.v13i1.38289

Abstract

This study investigates the influence of Shielded Metal Arc Welding (SMAW) welding parameters on the remaining compressive capacity of angle-shaped steel members used for structural strengthening. The analysis focuses on members with thin hot-rolled profiles (40.4 x 40.4 x 4.0 mm, 50.5 x 50.5 x 5.0 mm, and 60.6 x 60.6 x 6.0 mm). A finite element model simulates the heat distribution caused by welding, leading to a temperature increase within the member. Welding scenarios are simulated using various combinations of current strength and welding speed based on the specifications for electrode type E6013. The remaining compressive capacity is determined by segmenting the cross-section based on temperature intervals and considering the member's slenderness. The analysis reveals a clear correlation between welding parameters and compressive capacity loss. Employing a higher current and lower welding speed leads to a more significant reduction in capacity due to the resulting extensive heat-affected zone (HAZ). Conversely, the lowest current and highest speed scenario minimizes the HAZ, resulting in the highest remaining compressive capacity. The analysis demonstrates that the 40.4 x 40.4 x 4.0 mm member can retain up to 51.15% of its original capacity under these optimal conditions, while the 50.5 x 50.5 x 5.0 mm and 60.6 x 60.6 x 6.0 mm members can retain 57.79% and 75.78%, respectively. In contrast, the worst-case scenario employing high current and low speed significantly reduces the remaining capacity, with reductions down to 6.79%, 10.87%, and 10.54% for the respective member sizes. These findings highlight the importance of optimizing welding parameters to minimize the negative impact on the compressive capacity of steel members during strengthening operations.
Numerical Investigation of Steel Section Remaining Tensile Capacity During SMAW Welding Mushthofa, Malik
AGREGAT Vol 9 No 1 (2024)
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/ag.v9i1.22374

Abstract

This study investigates a method for calculating the remaining axial tension capacity of thin steel sections during Shielded Metal Arc Welding (SMAW) under load. This necessitates a method to address situations where welding operations must be performed on structures already experiencing stress. Thin sections are particularly susceptible to the elevated temperatures associated with welding. To address this challenge, simulations were utilized to model the effect of the welding heat on thin sections. The simulations considered the temperature rise experienced by each segment within the section. This rise led to a reduction in yield strength, ultimate strength, and elastic modulus for each segment. Subsequently, the partial tension capacity for each segment was calculated based on its area and the reduced strength properties. Finally, the remaining axial tension capacity was determined by summing the tension capacities of all segments. The results revealed a noteworthy correlation between welding parameters and the remaining tension capacity. Higher welding currents were associated with a greater loss of tension capacity, while faster welding speeds resulted in minimizing this loss. The scenario employing the lowest welding current and highest welding speed yielded the most favorable outcome, with the remaining tension capacity reaching 76%, 85%, and 89% for sections of 40.40.4, 50.50.5, and 60.60.6, respectively. Conversely, employing the highest welding current and slowest welding speed significantly reduced the remaining axial tension capacity until there were only 28%, 50%, and 66% left for the respective sections.
Pengaruh Metode Rawatan Beton terhadap Kuat Tekan, Modulus Elastisitas dan Kuat Lentur Beton Agustina, Hasnaa Anggia; Mushthofa, Malik
Prosiding Seminar Nasional Teknik Sipil UMS 2023: Prosiding Seminar Nasional Teknik Sipil UMS
Publisher : Universitas Muhammadiyah Surakarta

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

Abstract

Perawatan beton sangat penting dalam menjaga kondisi optimal permukaan beton setelah bekisting dibuka agar beton dapat mencapai kekuatan yang direncakan. Tujuan perawatan beton adalah untuk mencegah atau mengurangi kehilangan air dari beton yang diperlukan dalam proses hidrasi. Metode perawatan beton yang paling optimal adalah perendaman, tetapi metode ini tidak dapat diterapkan di lapangan, sehingga perawatan beton cast in situ biasanya menggunakan metode lain seperti material lembaran atau curing compound. Penelitian ini bertujuan untuk mengetahui pengaruh metode rawatan beton terhadap kuat tekan, modulus elastisitas dan kuat lentur beton serta untuk mengetahui metode perawatan manakah yang paling efektif digunakan di lapangan. Dalam penelitian ini, dilakukan perawatan beton menggunakan metode perawatan berupa perendaman, menutupi permukaan beton dengan karung goni basah dan menyemprotkan curing compound merek Antisol-S. Hasil pengujian menunjukkan bahwa penggunaan metode perendaman menghasilkan kuat tekan beton yang lebih tinggi dibandingkan dengan menggunakan karung goni basah dan curing compound. Selain itu, penggunaan metode perendaman juga menghasilkan modulus elastisitas dan kuat lentur yang lebih tinggi dibandingkan dengan menggunakan karung goni basah dan curing compound.
Investigation of Effective Section Reduction in Low Carbon Steel during SMAW Welding Mushthofa, Malik; Fakhri Pratama Nurfauzi; Astriana Hardawati
Teknisia Vol 28 No 2 (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.iss2.art2

Abstract

Welding, with its advantages of expedient execution and reduced weight, is a favored method for structural connections. However, it poses a significant risk, softening the steel and diminishing load-bearing capacity, underscoring the importance of accurate estimation. The need for precision is paramount, as critical infrastructure must remain operational not only during disasters but also during repair and maintenance activities. To address this challenge, this research introduces an approach to estimate the extent of capacity reduction resulting from welding, providing engineers with valuable insights for maintaining these critical systems structural integrity and functionality. The study examined low-carbon steel with various thicknesses, focusing on Heat Affected Zone (HAZ) width calculations and Abaqus simulations. Welding was performed at a speed of 1.67 cm/s with a 5 mm element increment. This research aimed to investigate the impact of welding parameters on low-carbon steel, particularly concerning HAZ measurements. A 4 mm-thick plate generated a 38.73 mm affected zone, while simulations with 5 mm to 12 mm thicknesses produced progressively narrower affected zones. Results demonstrated that steel plate thickness significantly influences the affected zone width, with thicker plates yielding narrower affected zones. The study examined low carbon steel with a 4 mm thickness, focusing on Heat Affected Zone (HAZ) width calculations and Abaqus simulations. Welding was performed at a speed of 1.67 cm/s with a 5 mm element increment. The research aimed to investigate the impact of welding parameters on low carbon steel, particularly concerning HAZ measurements. Results demonstrated that steel plate thickness significantly influences the affected zone width, with thicker plates yielding narrower affected zones. A 4 mm-thick plate generated a 38.73 mm affected zone, while simulations with 5 mm to 12 mm thicknesses produced progressively narrower affected zones.
Pengaruh Penambahan Vermikulit pada Beton Normal Terhadap Kuat Lentur Balok Terdukung Sederhana Lintang Dian Artanti; Malik Mushthofa
Teknisia Vol 28 No 2 (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.iss2.art6

Abstract

Concrete innovation in the construction industry continues to grow until now. One of the substantial innovations made is adding a material called vermiculite. If changes in compressive strength of concrete were observed in the previous study, then changes in concrete weight and flexural strength of concrete with the addition of vermiculite as much as 12%, 24%, and 36% were observed in this study. Concrete specimens were cured with water for 28 days and then weighted and tested for flexural strength with two loading points. The test results show that the lightest concrete is found in concrete with the addition of 36% vermiculite, with a weight difference of 0.03% lighter than normal concrete. Based on the results of the flexural strength test, the addition of 36% vermiculite makes the flexural strength of concrete 42.75% higher than normal concrete. This improvement proves that vermiculite's high water absorption properties can reduce the excess water content in concrete to reduce its weight, making the concrete denser and increasing its flexural strength.
Co-Authors Agustina, Hasnaa Anggia Astriana Hardawati Fakhri Pratama Nurfauzi Gunawan Setiadi Hardawati, Astriana Imam Trianggoro Saputro Lintang Dian Artanti Mochamad Teguh Tegar Fadillah Widodo Wisnu Erlangga