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All Journal Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan International Journal of Civil Engineering and Infrastructure (IJCEI)
Hikma Dewita
Tama Jagakarsa University
Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Engineering Environmental Science Transportation

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Effect of Adding Fly Ash and Rice Husk Ash on Compressive Strength to Meet the fc'35 MPa Concrete Quality Mardiaman Mardiaman; Hikma Dewita
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Vol 7, No 1 (2022): March
Publisher : Litbang Pemas - Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/cvl.v7i1.778

Abstract

Portland cement usage has increased, leading to substitute materials being sought. The composition of the concrete mix material affects its strength. Concrete compressive strength is usually determined in 7, 14, 21 and 28 days. This study determined the compressive strength of concrete at variations of 28, 35, 42 and 49 days. The attained compressive design strength was fc'35 MPa from the variation of the mixed materials. The compressive test results based on the variation were above fc'35 MPa. The two substitute materials meet the strength requirements. The addition of fly ash and rice husk ash decreased the compressive strength of concrete at 28 days. The compressive strength of regular concrete and with additional materials is more than 35 MPa. Adding fly ash and rice husk ash by 20% still resulted in the compressive strength of concrete above 35 MPa, namely 36.78 MPa and 35.04 MPa.
CONTROL OF SCHOOL FACILITIES AND INFRASTRUCTURE PROJECTS OF OGAN KOMERING ILIR REGENCY AND OGAN ILIR REGENCY Handa Dwi Sanrach; Hikma Dewita; Kristina Sembiring; Pio Ranap Tua Nabiho
International Journal of Civil Engineering and Infrastructure Vol. 3 No. 2 (2023): IJCEI Volume 3 No. 2
Publisher : University Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/ijcei.3.2.21-30

Abstract

The project and school infrastructure of Ogan Komering Ilir Regency and Ogan Ilir Regency aims to determine project performance. The analysis was carried out based on completed projects in the aspects of time and cost control using the Earned Value Analysis concept which consists of three indicators, namely BCWS, BCWP and ACWP. The analysis was carried out on time deviations (SV), cost deviations (CV), total budget deviations (BV) and was carried out in weeks (21 weeks). From this deviation analysis, productivity and project performance can be analyzed again, such as the time performance index (SPI) and Cost Performance Index (CPI). Based on Earned Value analysis, the schedule deviation (SV) on the project is 0. This means that in Week 21 the heavy work carried out was completed according to plan. Apart from that, the time performance index on the project is 1 (implementation completed according to schedule), while the cost performance index is 1.03 (1.3 > 1 which means expenditure is lower than planned).
SEISMIC PERFORMANCE ANALYSIS OF A THREE-STORY COLD-FORMED STEEL FRAME USING ANSYS BASED ON SNI 1726:2019 Jihaan Jamilah; Pio Ranap Tua Naibaho; Hikma Dewita
International Journal of Civil Engineering and Infrastructure Vol. 6 No. 1 (2026): IJCEI Volume 6 No. 1
Publisher : University Muhammadiyah Jakarta

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Abstract

Indonesia is located in a region with high seismic activity, making earthquake-resistant structural design an essential consideration in building construction. Cold-formed steel (CFS) has become an attractive structural material due to its lightweight characteristics, high strength-to-weight ratio, ease of fabrication, and construction efficiency. However, its relatively thin cross-section requires further evaluation of its seismic performance, particularly for multi-story buildings. This study aims to analyse the dynamic characteristics and seismic performance of a three-story cold-formed steel frame structure subjected to earthquake loading based on SNI 1726:2019 using ANSYS through the Finite Element Method (FEM). The research involved structural modelling, modal analysis, and earthquake load analysis using the Equivalent Lateral Force (ELF) method. The evaluated parameters included natural frequency, vibration period, structural deformation, interstory drift, and maximum structural stress. The analysis results show that the first-mode natural frequency is 9.9662 Hz with a fundamental vibration period of 0.1003 s. The maximum deformation obtained is 0.169 mm, while the maximum interstory drift reaches 0.0066 mm, which is significantly lower than the allowable limit of 72 mm specified in SNI 1726:2019. Furthermore, the maximum structural stress is 1.5202 MPa, considerably lower than the yield strength of G550 steel (550 MPa), indicating that the structure remains within the elastic range. These findings demonstrate that the analysed three-story cold-formed steel frame possesses adequate stiffness, satisfies the seismic performance requirements of SNI 1726:2019, and can safely withstand the applied earthquake loading. Keywords: Cold-Formed Steel; ANSYS; Finite Element Method; Seismic Performance; Earthquake Load.
ANALYSIS OF THE FOUNDATION DESIGN FOR THE LOWER STRUCTURE OF THE CIBEET RIVER BRIDGE (STA 0+952), DELTAMAS CITY Mochamad Iqbal Nugraha; Pio Ranap Tua Naibaho; Hikma Dewita
International Journal of Civil Engineering and Infrastructure Vol. 6 No. 1 (2026): IJCEI Volume 6 No. 1
Publisher : University Muhammadiyah Jakarta

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Abstract

The substructure of a bridge plays a vital role in ensuring the stability and safety of the bridge structure by transferring loads from the superstructure to the supporting ground. The construction of the Cibeet River Bridge at STA 0+952 in Deltamas City requires a reliable foundation system due to varying subsurface soil conditions. Therefore, evaluating the bearing capacity and structural performance of the bridge abutments and bored pile foundations is crucial. This study aims to analyze the results of soil investigations obtained from field and laboratory tests, determine the bearing capacity of the bored pile foundations, and evaluate the structural design of the bridge abutments. The research methodology involved a literature review, collection of bridge design data, and analysis of geotechnical investigation data, including Standard Penetration Tests (SPT), Cone Penetration Tests (CPT), borehole logs, and laboratory tests. The structural analysis considered dead loads, earth pressure, additional loads, traffic loads, braking loads, and seismic loads acting on the abutments. The research results indicate that the selected bored pile foundations provide sufficient bearing capacity to support the applied structural loads, while the abutment design meets the required structural strength and stability criteria. Strengthening analyses for the abutment walls, pile heads, and bored piles also indicate that the designed reinforcements meet the structural requirements under the applicable load combinations. Overall, the planned bridge substructure is capable of safely transferring loads to the foundation system and is considered suitable for implementation in the Cibeet River Bridge project. Keywords: Bridge, Abutment, Bored Pile, Bearing Capacity, Soil Investigation.
Co-Authors Handa Dwi Sanrach Jihaan Jamilah Kristina Sembiring Mardiaman, Mardiaman Mochamad Iqbal Nugraha Pio Ranap Tua Nabiho Pio Ranap Tua Naibaho