Jurnal Spesialis Teknik Sipil (JSpTS)

Construction Safety Plan for High-Rise Building Construction Projects: Evaluation and Development

Fhirtania Ashril Indarta, Jojok Widodo Soetjipto, Anik Ratnaningsih — Thu, 30 Oct 2025 00:00:00 +0000

Multi-story building construction projects have high complexity, involving many stakeholders with different skills and competencies. Therefore this project has a threat of failing to comply with security, safety, health, and sustainability (K4) standards. The government requires each project development stage to implement a Construction Safety Plan (RKK), but in reality, many construction activities still need to pay attention to this standard. Therefore it is necessary to evaluate RKK implementation in construction projects to minimize construction accidents. This study aims to determine the implementation of construction safety planning stages in building projects. This research will take a case study of the Regent's Office Building Project and the Regional Secretariat of Pasuruan Regency by conducting direct observations and interviews to evaluate the implementation of the RKK. The study results show that all components of the RKK are available, but the analysis of the potential hazards that may occur still needs to be improved. Job safety analysis as a construction safety plan has yet to be supported by proper hazard identification, risk assessment, and risk control following the implemented implementation method. This research can use the Hazard Identification, Risk Assessment, and Risk Control (HIRARC) method to solve this problem. The results of the HIRARC method assessment adjusted for the available variables according to the project implementation method yielded the following results. There were 26 variables with low risk, 57 with medium risk, and 21 with high risk. The hazard risk control strategy is prepared based on the OHS risk control hierarchy, namely engineering control, administrative management, and provision of PPE, because almost all activities in building work do not allow for eliminating risks using elimination and substitution.

Strategy and Direction for Tourism Infrastructure Development to Increase the Attractiveness and Sustainability of Kampe Beach

Shofi Nindia Emely, Jojok Widodo Soetjipto, Ratih Novi Listyawati — Thu, 30 Oct 2025 00:00:00 +0000

Infrastructure plays an important role in developing regions, particularly in the economic, social, cultural, and environmental aspects. One of the regions experiencing development is Banyuwangi Regency, particularly in the tourism sector, as it has the greatest tourist attractions, thus having the potential to support economic growth. Kampe Beach is one of the designated tourism areas with natural tourist attractions in Banyuwangi Regency. Based on the 2012-2032 Banyuwangi Regency Spatial Plan, Kampe Beach is included in the Tourism Development Area (WPP) I. The infrastructure owned by Kampe Beach is still inadequate and there are several supporting tourism infrastructures that are not yet available. Therefore, there is a need for infrastructure development directions that can support tourism activities at Kampe Beach so that it can assist the Banyuwangi Regency government in developing the region. This study aims to determine the existing condition of Kampe Beach and the level of importance and performance of Kampe Beach infrastructure so that directions for Kampe Beach infrastructure development can be formulated to support the tourism sector in Banyuwangi Regency. The methods used in this study are descriptive analysis to identify existing conditions, the Importance-Performance Analysis (IPA) method to determine the level of importance and performance of each research variable, and triangulation analysis to formulate infrastructure development directions. This study determined the sample using the Lemeshow formula and produced 67 respondents to determine the level of importance and performance of the predetermined variables. The results of the study indicate that infrastructure that requires development directions is located in quadrant I consisting of waste, road networks, road signs, parking lots, and security posts. Development directions that need to be carried out at the research location include conducting socialization and training, procuring infrastructure that is not yet available, and placing road signs more strategically.

Research Study of Water Cementitious Factor in Fly Ash (Coal) Based Geopolymer Concrete Based on Compressive Strength

Fridolin A. M. A. Sani Naitkaki, Ester Priskasari, Nenny Roostrianawaty — Thu, 30 Oct 2025 00:00:00 +0000

Fly ash based geopolymer concrete is an environmentally friendly alternative that can replace conventional Portland cement based concrete. This study aims to analyze the effect of the water cementitious (W/C) ratio on the compressive strength of Type C fly ash based geopolymer concrete from the Paiton Power Plant, as well as to determine the correlation between the water cementitious ratio and the concrete's compressive strength. The variations of the water cementitious ratio used were 0,35, 0,4, 0,45, 0,5, 0,55, 0,6, and 0,65. The alkaline activator used consisted of 8 M potassium hydroxide (KOH) and sodium silicate (Na₂SiO₃) with a ratio of 3:1. The test specimens, in the form of concrete cylinders (Ø15 cm × 30 cm), were tested at the ages of 3 and 7 days using the room temperature curing method. The results show that the compressive strength of the geopolymer concrete decreases with the increase of the water cementitious (W/C) ratio. At 3 days, the highest compressive strength of 28,42 MPa was achieved at a W/C of 0,35, while the lowest was 17,94 MPa at a W/C of 0,65. At 7 days, the highest compressive strength reached 37,13 MPa (W/C 0,35) and the lowest was 23,89 MPa (W/C 0,65). The concrete slump value increased with the increase in the W/C ratio, with the highest value of 18,4 cm at a W/C of 0,65. The test results conclude that the water cementitious (W/C) ratios of 0,35, 0,4, 0,45, 0,5, 0,55, 0,6, and 0,65 have a significant effect on the compressive strength of geopolymer concrete, where a higher water cementitious (W/C) ratio results in lower compressive strength.

Comparative Study of the Effect of Variations in Arch Shape on the Stability of Arch Bridge Structures

Legat Bestari, Ester Priskasari, Hadi Surya Wibawanto Sunarwadi — Thu, 30 Oct 2025 00:00:00 +0000

Arch bridges represent a widely favoured structural form, celebrated for their inherent efficiency and aesthetic appeal. Variations in arch geometry, such as circular and parabolic shapes, exert a significant influence on both the structural stability and load distribution within the design. This research endeavours to conduct a comparative analysis of how distinct arch geometries—specifically circular and parabolic—impact the structural stability of arch bridges. The investigation centres on a case study utilising a model arch bridge from the 19th Indonesian Bridge Competition (KJI) in 2024. The methodology employed involves structural analysis facilitated by SAP2000 v.24 software, adhering strictly to the guidelines set forth by KJI XIX 2024 and SNI 1729:2020 for comprehensive evaluation. Key parameters subjected to analysis included internal forces, stress, strain, deflection, and material efficiency. The analytical findings reveal that the bridge model incorporating a parabolic arch demonstrates superior performance. While the maximum axial forces in the arch rib and hangers were higher in the parabolic model, this model exhibited substantially lower bending moments in the arch rib (45.36 kNmm) and longitudinal girder (32.55 kNmm) when compared to the circular arch model (86.51 kNmm and 87.41 kNmm). Furthermore, the maximum deflection observed in the parabolic model (1.75 mm) was notably less than that of the circular model (2.21 mm). In terms of material consumption, the parabolic arch bridge model proved more efficient, with a total weight of 19.19 kg, making it 51.9% lighter than the circular arch bridge model, which weighed 37 kg. In conclusion, the parabolic arch form imparts enhanced structural stability and greater material efficiency, proving more effective in channelling loads primarily into pure compressive forces, thereby mitigating overall bending moments and deformations.

Land Improvement Planning Using PVD (Prefabricated Vertical Drain) and Embankment (Preloading) in the Construction of ITS Tower 3 Building

Agista Tri Kurniawan, Eding Iskak Imananto, Eri Andrian Yudianto — Thu, 30 Oct 2025 00:00:00 +0000

The construction of ITS Tower 3 in Surabaya faces challenges due to the presence of soft clay soil characterized by low bearing capacity, high compressibility, and low permeability, which pose risks of significant settlement and endanger the stability of high-rise structures. To address this issue, soil improvement was planned using the preloading method combined with Prefabricated Vertical Drain (PVD) installation to accelerate the consolidation process. This study aims to analyze the magnitude of soil settlement and consolidation time under untreated conditions and compare them with conditions after applying PVD with different installation patterns (triangular and square) and spacing variations (1.0 m–1.6 m). The research methods include analyzing field and laboratory soil test data, calculating consolidation parameters, and simulating consolidation time based on different PVD configurations. The results show that PVD application significantly accelerates consolidation time compared to untreated soil, with triangular patterns at closer spacing providing higher efficiency despite requiring higher costs. Furthermore, the combination of preloading and PVD proved effective in accelerating initial settlement before structural construction, thereby reducing the risk of long-term deformation.