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All Journal PRESUNIVE CIVIL ENGINEERING JOURNAL
Ika Bali
President University
Arts Civil Engineering, Building, Construction & Architecture Control & Systems Engineering

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Deviations Due to the Discrete Modeling of the Structures Binsar H. Hariandja; Ika Bali
PRESUNIVE CIVIL ENGINEERING JOURNAL Vol. 1 No. 1 (2023)
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33021/pcej.v1i1.4241

Abstract

Real existing structures are generally complicated in geometry that might make them unsuitable or difficult forthe analyses. Several assumptions or simplifications are usually made by the practitioners to make them simpler andmay be analyzed in ease. The assumptions and/or simplifications might make the analyses much easier; however,they might create some deviations from the true behavior of the structures, which are in fact, are not known preciselyto the analysts. The paper discusses some examples for simplifications in the analysis or the structural systems. Theexamples include the types of the simplifications, and the deviations that caused by them. The types ofsimplifications are in the case of material behavior, the geometry of the system, an in the case of connectivity of thestructural components. The results signify the importance of wisdom in the setting of the simplifications and theassumptions to make the analyses easier but with dependable results.
Compressive Strength of Concrete Containing Recycled Glass Powder Bimantara Putra Nugraha; Eddy Triyanto Sudjatmiko; Ika Bali
PRESUNIVE CIVIL ENGINEERING JOURNAL Vol. 1 No. 1 (2023)
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33021/pcej.v1i1.4242

Abstract

Glass bottle waste takes a million years to decompose. Recycling is the best option to solve this problem. Onealternative is to use recycled glass in the form of powder as a material for making concrete. This study proposes theuse of recycled glass powder as a concrete material to partially substitute fine aggregate. This study aims todetermine the effect of glass powder as a partial substitute for fine aggregate on the compressive strength of concrete.Partial substitution of fine aggregate was selected with a percentage of 5%, 10%, and 15%. Standard cylindricalspecimens aged 28 days used in compressive strength testing in this study. Then, the test results of concretecontaining recycled glass powder compared to ordinary concrete. The test results show that the compressive strengthof concrete containing 15% recycled glass powder gives an average compressive strength of 35.57 MPa which isslightly higher than the compressive strength of normal concrete of 35.10 MPa. This study found that the use of glasspowder as a substitute for fine aggregate can be used as a substitute for normal concrete in terms of compressivestrength and reduce glass waste.
On-Site Earthquake Early Warning System as an Alternative Earthquake Mitigation Solution in Indonesia Ika Bali
PRESUNIVE CIVIL ENGINEERING JOURNAL Vol. 1 No. 1 (2023)
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33021/pcej.v1i1.4245

Abstract

The Banten earthquake, which had a magnitude of 6.6 on January 14, 2022, damaged 3,078 houses. Thatnumber consisted of 395 heavily damaged units, 692 moderately damaged units and 1,991 lightly damaged units(Tempo.co, 2022). The Banten earthquake was a strong earthquake where the magnitude was greater than a scale of5. Damage to houses caused by the earthquake occurred in most single-story houses or low-rise buildings. Given thelarge number of one-story houses that are damaged every time a major earthquake occurs in Indonesia, there needs tobe appropriate mitigation measures to reduce the risk of earthquake disasters, especially for human casualties. AnOn-site Earthquake Early Warning System (On-site EEWS) can be an alternative in reducing victims of the disaster.This earthquake early warning system has sensors that are installed on the site of building houses and can predictstrong earthquake waves that are destructive in nature (S/Secondary Waves) through P/Primary Waves that arriveearly in about 10-20 seconds. This time is sufficient for evacuation for the occupants of a one-story house if the earlywarning alarm is properly responded to. This early warning radius can reach 20 km from the on-site EEWS locationconsidering that this area has relatively the same vibration effect. Currently, Indonesia through the BMKG isdeveloping EEWS as a part of the existing earthquake mitigation system. The purpose of this study is to describe theapplication of an on-site earthquake early warning system as an alternative solution for earthquake mitigation inIndonesia. This study evaluates several EEWS applications in the literature to find the best alternative to be appliedin Indonesia. The critical factors for on-site implementation of the EEWS discussed in this paper are compared withthe Taiwan regional EEWS. Based on the existing validation, the on-site EEWS has an 80% accuracy rate inpredicting the intensity level of a strong earthquake, capable to automatically send an alarm message within 3seconds and providing a warning time of at least 8 seconds before a destructive peak S wave arrives.
Construction Cost Reduction in Design of Prestressed Concrete Structural System Michelia Esteruli Instia Surbakti; Binsar Hariandja; Ika Bali
PRESUNIVE CIVIL ENGINEERING JOURNAL Vol. 2 No. 2 (2024)
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33021/pcej.v2i2.5483

Abstract

Concrete material has moderately strong compressive strength, but relatively weak tensile strength. To overcome this problem, three kinds of systems can be applied, namely reinforced concrete system, composite concrete system, and prestressed concrete system. In a prestressed concrete system, a compressive force is applied to annihilate the tension region in the concrete section. Compared to reinforced concrete, prestressed concrete requires a smaller section of concrete, since the whole cross section is in compression and active. However, prestressing concrete needs the use of high strength steel wire which is extremely costly. The use of prestressing concrete may be carried out using minimization on the use of such expensive high strength steel. In this research, two methods of minimization of the use of high strength steel, which are the shifting of the support of the beam to get the smaller field moment. The other method is to reshape the concrete section to have a higher moment of inertia. It is found out that the two methods perform well in the minimization process of construction cost of the prestressing concrete beam.
Sediment Characteristics and Prediction of Sediment Yield in Drainage Channel: A Study on Yos Sudarso Street Cikarang City Emilia Arista Irianto; Eddy Triyanto Sudjatmiko; Ika Bali
PRESUNIVE CIVIL ENGINEERING JOURNAL Vol. 2 No. 2 (2024)
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33021/pcej.v2i2.5529

Abstract

Yos Sudarso Street, Cikarang City, is crucial for mobility and economic activity. However, Yos Sudarso Street has waterlogging and flooding issues due to severe sediment accumulation, resulting in siltation of the channel, so it cannot flow stormwater properly. This study aims to identify sediment characteristics and predict sediment yield in the drainage channel on Yos Sudarso Street, Cikarang City. It’s essential because sediment has negative impacts on drainage channels. The limited studies on sediment characteristics and sediment yield prediction in urban areas make this study necessary. The bed sediment samples were taken from 3 points in the drainage channel to identify the sediment characteristics. Sediment yield prediction using the Universal Soil Loss Equation method based on rainfall erosivity, soil erodibility, slope length, steepness, and crop management factors. The sediment characteristics at sites 1, 16, and 17 were dominated by large sand grains (0.82-1.81 mm) that were difficult to transport. Poorly sorted indicates low flow energy. Grain size distribution extends to fine grains. Sites 1 and 17 are concentrated at mean size, while site 16 is concentrated at the extreme size. The sediment yield prediction by the universal soil loss equation is 1.989 (t/ha/yr). This information can be used to formulate effective sedimentation control strategies.
Study of Base Shear and Inter-Story Drift due to Earthquake Forces on a Ten-Story Building Structure in Surakarta Yudistira Cahaya Assidiq; Ika Bali
PRESUNIVE CIVIL ENGINEERING JOURNAL Vol. 3 No. 1 (2025)
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33021/pcej.v3i1.5627

Abstract

Earthquakes are the frequent natural disasters that hit Indonesia as a consequence of the country's geographical location. Surakarta City become a region that frequently suffers the effects of earthquakes. Earthquake disasters threaten high-rise building structures in Surakarta City, where earthquake loads acting on the structure can cause damage and even structural collapse. These historical and geographical reasons become the foundation of this research to analyze high-rise building structures in Surakarta City. In this study, the structural conditions of the analyzed high-rise buildings comply with the equivalent static method's analysis requirements, so that this method can be employed in this research. The equivalent static analysis was conducted through manual calculation and the ETABS program. This study focuses on several structural parameters, including base shear force, and inter-story drift. Based on the analysis that was already conducted, the base shear force was obtained at 14392.365 kN through manual calculation and 14984.490 kN through ETABS program analysis. The inter-story drift value that was already calculated fulfils the maximum threshold requirements, where the inter-story drift values are 17.984 mm – 68.183 mm in the X direction and 9.846 mm - 46.804 mm in the Y direction.
Comparative Structural Seismic Performance of a 10-Story Commercial Building Using Lightweight Precast Concrete Panels and Lightweight Brick Wall Systems Naisha Elvira Tanjung; Ivan Imanuel; Ika Bali
PRESUNIVE CIVIL ENGINEERING JOURNAL Vol. 3 No. 2 (2025)
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33021/pcej.v3i2.6323

Abstract

This study presents a comparative seismic performance analysis of a 10-story commercial building in North Jakarta, an area characterized by high seismicity and challenging geotechnical conditions. Two identical structural models were analyzed using ETABS v2022: one using a lightweight precast concrete panel system (JOE Green X3) and the other using a conventional Autoclaved Aerated Concrete (AAC) lightweight brick system. The aim is to compare the seismic structural performance of the analysis, based on the response spectrum method in accordance with SNI 1726:2019, revealed that the precast concrete panel system, was 14.4% lighter than the AAC lightweight bricks system when accounting for its full installed weight, including plaster and bracing columns. It resulted in a shorter fundamental period (0.412 s) compared to 0.453 s of the AAC lightweight brick system. However, the seismic base shear forces are nearly identical due to compensating effects in the site-specific response spectrum. Although both systems meet the deflection limits mandated by regulations, their performance is direction-dependent. This study concludes that the substantial reduction in total mass of the precast panel system provides a shorter vibration period but comparable seismic performance to the AAC lightweight brick system.
Co-Authors Bimantara Putra Nugraha Binsar H. Hariandja Binsar Hariandja Eddy Triyanto Sudjatmiko Emilia Arista Irianto Ivan Imanuel Michelia Esteruli Instia Surbakti Naisha Elvira Tanjung Yudistira Cahaya Assidiq