REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development

Pengaruh Menghilangkan Dinding Geser Terhadap Perilaku Stuktur Gedung 11 Lantai dengan Denah L-Shaped

R.A.N. Dhanarsari, S. Indra, Y.P. Manaha — Wed, 03 Sep 2025 00:00:00 +0000

Malang Regency is an area prone to tectonic earthquakes, so the planning of multi-story buildings, especially those with an asymmetric L-shaped plan, needs to consider the optimization of earthquake-resistant structures. Shear walls are commonly used to increase structural stiffness, but they can introduce complexities in planning and construction. This study aims to evaluate the effect of removing shear walls on the structural behavior of the Samaview Residence Building, an 11-story building with an L-shaped plan in Malang Regency. Structural analysis was carried out with the help of the ETABS 18 program using building technical data, material data, and building design drawings obtained from the implementer and literature studies. The analysis includes determining the dimensions of structural elements based on SNI 2847:2019, calculating gravity and earthquake loads according to SNI 1727:2020 and SNI 1726:2019, as well as evaluating inter-story drift, structural irregularities, and P-Delta effects. The analysis results show that the removal of the shear wall still results in structural element dimensions that meet the requirements of SNI 2847:2019. Structural drift and P-Delta effects also meet the requirements of SNI 1726:2019, although there are inside corner irregularities that need to be considered in the design. It can be concluded that removing the shear walls in the Samaview Residence Building does not affect the ability of the structure to withstand gravity and earthquake loads. However, special attention needs to be paid to the inner corner irregularities, drift, and P-Delta effects to ensure the effectiveness of the earthquake-resistant structural system

Prediksi Kerawanan Banjir di Daerah Aliran Sungai Olaya Kabupaten Parigi Moutong

R. Rivai, I.G. Tunas, R. Mardin — Wed, 03 Sep 2025 00:00:00 +0000

This study aims to determine the distribution of flood vulnerability levels in the Olaya Watershed located in Parigi Moutong Regency, using two previous research methods, namely the Hamdani et al. method, and the Latue & Latue method, which were then validated in the field to determine the level of validity of the two methods. The method used is data collection such as rainfall data, flood incident data, Olaya Watershed maps, DEMNAS maps, soil type maps and spot 6 satellite image maps. The analysis carried out in this study includes classifying and scoring the classification of rainfall parameters, slope gradient, land use, soil type, river buffer, elevation and Overlay is carried out by combining all input flood vulnerability parameters that have been mapped, to obtain flood vulnerability values and flood vulnerability level maps. The results of this study are the results of the analysis of flood vulnerability levels using the Hamdani et al. method, divided into Most Safe, Threatened, Vulnerable and Most Vulnerable while the Latue & Latue method is divided into Low, Medium and High. The results of these two methods are not yet in accordance with the flood events in the Olaya Watershed, this is because the weight of each parameter is not yet appropriate, there are still parameters that have not been included in the flood vulnerability modeling, the scoring of the parameter classification is not yet appropriate and the classification and scoring of the parameters are different

Effect of Activator Composition on the Setting Time and Compressive Srength Of Fly Ash–Lime-Based Geopolymer Paste

B.R. Ramadhan, C.J. Lonardya, A.A. Adam, S.N. Akifa, S.N. Wahidin, F.R. Payung — Wed, 03 Sep 2025 00:00:00 +0000

This study aims to investigate the optimal composition of geopolymer paste based on fly ash and lime to achieve ambient temperature hardening, ideal setting time, and high compressive strength. The primary materials used include Class F fly ash from the Mpanau coal-fired power plant and hydrated lime (calcium hydroxide) at 5% of the fly ash weight. The activators employed were Sodium Silicate (Na₂SiO₃) and Sodium Hydroxide (NaOH), with Na₂O dosage variations of 7.5%, 10%, and 12.5%, and activator modulus (SiO₂/Na₂O ratio) variations of 0.75, 1.00, and 1.25. The specimens were cylindrical with a diameter of 25 mm and a height of 50 mm, and compressive strength tests were conducted at 3, 7, 14, and 28 days. The results showed that the optimum setting time was achieved at a Na₂O dosage of 7.5% with an activator modulus of 0.75 and 1.00, yielding setting times of 88.67 and 60.94 minutes, respectively. The highest compressive strength was recorded at a Na₂O dosage of 10% with an activator modulus of 1.25, reaching 29.76 MPa at 28 days. These findings suggest that the composition of the alkaline activator significantly influences the early-age properties and mechanical performance of fly ash–lime-based geopolymer paste

Analisis Transpor Sedimen Dasar Sungai Alopohu yang Bermuara di Danau Limboto

A.A.O. Asri, R. Husnan, K.A. Utama — Wed, 03 Sep 2025 00:00:00 +0000

One of the causes of flooding in Gorontalo is the reduced capacity of Lake Limboto, which has served as a natural water reservoir and flood preventer, to perform these functions effectively due to siltation. This diminished capacity is attributable to the deposition of sedimentary material carried by the rivers that drain into Lake Limboto. A total of 23 rivers discharge into Lake Limboto, contributing sedimentation on an annual basis. Among these, the Alopohu River is one of the most significant contributors. The objective of this study was to quantify the sediment transport generated by the Alopohu River. The analysis was conducted through the collection of direct measurement observation data in the downstream region of the Alopohu River, with the objective of obtaining data on river geometry, flow velocity, instantaneous discharge, and bottom sediment samples. Laboratory tests were conducted on basic sediment samples in order to ascertain the characteristics of the sediment grains. The data were subsequently analyzed using empirical formulas, namely the Meyer-Peter and Muller, Einstein, and Frijlink formulas. The quantity of bed sediment transport (bed load) in the downstream Alopohu River, as determined by discharge measurements and the application of the Meyer-Peter and Muller formula, is 2.86 tons per year. The Einstein formula yields a value of 621 tons per year, while the Frijlink formula produces a result of 54.67 tons per year. The discrepancy in the calculated values for each empirical formula is attributed to the specific parameters utilized in each formula

Perencanaan Struktur Atas Bangunan Gedung Menggunakan Sistem Rangka Bresing

M.R. Putra; F. Amir, H. Listiawaty, M. Sutrisno — Wed, 03 Sep 2025 00:00:00 +0000

After the 2018 earthquake, a number of constructions in Palu City, especially buildings, grew rapidly. In the construction of buildings using steel structures, the use of braces aims to reduce displacement and increase the capacity of shear forces to resist cracking. Steel produces greater ductility when compared to other structural materials, so it is a major requirement in designing earthquake-resistant steel structures. In this study, the structure of the building was designed to be 3 (three) stories in educational purpose. The structural system has a dual system combination Special Moment Resisting Steel Frame System (SMRF) and a lateral force resisting system, namely a Special Concentric Brace Frame System (SCBF). Steel material used are BJ 41 quality (fy = 250 MPa; fu = 410 MPa) and concrete using quality f'c = 25 MPa. The loads acting on the structure are dead load, live load, wind load, rain load, and earthquake load. The results of the structural analysis are: 99,42% mass participation is obtained for the x direction in mode 4 and 98,97% for the y direction in mode 5, the SRSS method was used to combine the number of mode varieties used, the obtained dynamic earthquake shear force response spectrum (x direction = 281993,31 kg and y direction = 280187,36 kg) has exceeded the equivalent static earthquake shear force (x direction and y direction = 280096,09 kg), the displacement that occurs in the x direction and y direction does not exceed the allowable displacement of 34,615 mm, the stability coefficient obtained in the x-direction and y-direction does not exceed the P-Delta effect limit of 0,1 and the structural stability limit of 0,0909, the structure does not occur horizontal irregularities and vertical irregularities, the Special Moment Resisting Steel Frame System (SMRF) has exceeded the percentage of 25% (x direction = 62,49% and y direction = 58,26%), the structural performance level in the x direction and y direction is in Damage Control condition.

Kajian Hidrologi untuk Mitigasi Longsor di Kawasan Jalan Sisi Lumajang (Sta.58+830 sd 59+930)

R.S. Karuru, C.S. Lioni, T.M.P. Mantong, B.R. Ramadhan, F.R. Payung — Sun, 07 Sep 2025 00:00:00 +0000

Watershed (DAS) of a tributary have caused landslides along the access road to the Besuk Koboan road and bridge construction project in Sumberwuluh Village, Candipuro District, Lumajang Regency. The watershed area examined in this study was located on the slope at STA 58+670, and is analyzed to assess surface runoff entering the main road due to the lack of natural reinforcement from vegetation as a result of land use conditions. Identification results indicate that the landslide was caused by erosion (scouring) at the base and foot of the slope; the riverbanks are composed of porous and easily eroded lava deposits from Mount Semeru, as well as water seepage from the cliff. The proposed landslide mitigation con+cept for the river slope includes: Slope reinforcement using piles, Design of a drainage system to manage surface water runoff, Protection of the slope foot from scouring using gabion structures (gabion lay dams) or riprap, Slope crest arrangement to reduce water infiltration, Box culvert cross-section design that takes into account the landslide condition on the slope. Furthermore, regarding the landslide condition affecting the National Road segment Malang–Lumajang at STA 58+830 to 58+930, which was impacted by inadequate existing drainage infrastructure, it is crucial to reconstruct the drainage system based on the analysis and study that has been conducted

Faktor Kualifikasi Kontraktor yang Mempengaruhi Kinerja Proyek Konstruksi Berdasarkan Persepsi Konsultan

C.Z. Lioni, F. Fahirah, L. Hakim — Sun, 07 Sep 2025 00:00:00 +0000

The development of quality infrastructure in Sigi Regency plays a vital role in supporting economic growth and community welfare, particularly in the aftermath of the 2018 earthquake. The success of this development is significantly influenced by contractor qualifications, which encompass technical aspects, experience, and available resources. This study aims to identify the dominant contractor qualification factors influencing construction project performance and to analyze the relationships among these factors based on the perceptions of consultants in Sigi Regency. This study employed a quantitative approach, distributing questionnaires to 37 consultants selected through purposive sampling. Data from 24 variables were analyzed using descriptive statistics, the Relative Rank Index (RRI), and Spearman's Rho correlation. The RRI analysis identified five dominant factors: financial obstacles during project implementation (RRI = 0.874), labor experience (RRI = 0.869), the educational background of the person-in-charge (RRI = 0.847), compliance with technical specifications (RRI = 0.815), and the educational background of implementers and supervisors (RRI = 0.811). The Spearman correlation analysis revealed a strong relationship between the educational backgrounds of implementers and the person-in-charge (r = 0.668). However, the financial obstacles factor showed a very weak correlation with the other four variables. This study underscores that human resource competency and financial readiness are critical factors for enhancing construction project performance in Sigi Regency.

Model Bangkitan Perjalanan Penduduk Hunian Tetap (Studi Kasus Hunian Tetap Tondo)

B. Badwi; J. Patunrangi; A. Setiawan — Sun, 07 Sep 2025 00:00:00 +0000

The Tondo permanent residence is located in Tondo sub-district, Mantikulore sub-district, Palu city. This residence will have a traffic impact on the surrounding road network because the impact of development in the area where the residence is built will still be an increase in population, increase in income, increase in vehicle ownership and the construction of a number of public facilities which will generate traffic generation and attraction so that It is necessary to conduct research on socio-economic characteristics, movement characteristics and generation models. Data collection was carried out using primary data through a home interview survey. To produce a trip generation model in this study, multiple linear regression methods were used. The socio-economic characteristics of Tondo permanent residences are 37.66% of family members amounting to 3 people, 39.29% total income of Rp. 1,000,000 – Rp. 3,000,000, the number of 2-wheeled vehicle owners is 40.58% who owns 2 units, the number of 4-wheeled vehicle owners is 88.64% and does not own a car and the travel intensity is 41.23%, amounting to 5 trips, while the characteristics of population movement in Tondo permanent residences namely the address before the earthquake 45.13% came from West Palu District, the type of work 49.03% worked as self-employed, the purpose of the trip 62.66% was to work, the education level of 79.22% was high school and the destination of the trip was 24.03% Head to Mantikulore District. The trip generation model is Y = 2.8642 + 0.9452 X3

Pengaruh Penambahan Dinding Geser Terhadap Perilaku Struktur pada Gedung Bertingkat 10 Lantai di Kota Malang

R. Bara, E. Priskasari, Y.P. Manaha — Sun, 07 Sep 2025 00:00:00 +0000

Building planning with earthquake-resistant structures is carried out to reduce the risk of loss and loss of life during earthquakes, especially in areas with high earthquake risk. This planning aims to evaluate the effect of adding shear walls on the structural behavior of a 10-story building in Malang City. Shear walls are generally used to increase structural stiffness and strengthen the structural system in resisting earthquake forces. With the addition of shear walls, better control of inter-story deviations where the value is significantly reduced compared to being designed as a single system. Shear walls or moment-resisting frames must be able to withstand at least 25% of the design earthquake force. Structural analysis is carried out with the ETABS 19 civil engineering assistance program using building technical data, material data, and building design drawings. The analysis includes determining dimensions based on SNI 2847: 2019 and loading and structural control based on SNI 1726: 2019. The results of the structural analysis show that with the addition of shear walls, the structural elements used are more effective and do not reduce the structure's ability to withstand earthquake loads or gravity loads. The planned shear wall has been able to accept more than 50% of the existing earthquake force, this result has met the minimum requirements for the load carried by the shear wall. The resulting drift also does not exceed the permissible drift, although there is a fairly large difference in the drift value. However, the determination of the location of the shear wall must still be adjusted to the needs and adjust the design of the planned building