Rekayasa Sipil

Curved Damper as Structural Retrofitting Element to Improve the Performance of Steel Truss Bridge

Alfinna Mahya Ummati — 2024-02-20

The curved damper can control the structure movement by a physical approach to reduce the lateral deformation under the earthquake, which previously proved to be a significant improvement when applied on a moment-resisting frame in a laboratory scale experiment. With the same idea, a curved damper is considered a passive control to reduce the excessive deformation for a single span of a steel truss bridge, which is analyzed by finite element modeling to evaluate the role of the curved damper in a complex structure. The study of curved dampers applied in this typical bridge showed that mid-span deformation can be mitigated by up to 62% under an earthquake. Hence, a structure with a curved damper is recommended for application in high seismic locations.

The Effect of The Addition of Bagasse Ash on The Making of Paving Block

Hammam Rofiqi Agustapraja — 2024-02-20

Paving Concrete is a composite of building materials made from a mixture of Portland cement or adhesive, water, and aggregate with or without other additives, which do not reduce the quality of the Concrete. In the research, fc' K-175 kg/cm² of bagasse ash was added with variations of 0%, 6%, 8%, and 12% bagasse ash; the weight is based on the weight of the cement. This study aimed to determine the compressive strength of Concrete obtained from a mixture of bagasse ash in K-175 kg/cm². The concrete mix design refers to SNI-03-0691-1996. Test samples prepared for each additional percentage of bagasse ash were three samples in the form of cubes with a length of 20 cm, a height of 8 cm, and a width of 10 cm. The results showed a decrease in strength with each addition of bagasse ash. It is known that the average compressive strength of Concrete after 28 days is 176.66%. Kg/m² and the lowest compressive strength were obtained by adding 12% ash from bagasse aged 28 days, which was 73.33 kg/m².

Integration of Java Programming-Based Pert and Earned Value Management Methods Based on Residential Precast Case Study to Improve Project Cost Efficiency

Zel Citra — 2024-02-20

The need for residential houses is still high for property and construction commodities. The availability of land and market prices for residential houses continue to increase yearly. Only 45.04% of Jakarta residents had a home ownership status in 2020. 2021 is the precast building mode. It is justified that precast construction structures can save 35% on construction costs and are 27.33% more reliable than ordinary concrete structures. The research examines the integration of the PERT method and earned value management (EVM) based on Java programming in residential precast case studies. The results of this study are that the implementation of the PERT method can increase the efficiency of project duration by 6%, and the implementation of the EVM method can increase project cost efficiency by 7% with the indicators Schedule Performance Index (SPI) = 1.01 (under schedule) and Cost Performance Index = 1, 07 (Under Budget)

Evaluation of Pile Cap Reinforcement Design Using Conventional and Finite Element with Strut and The Method Based on SNI 2847-2019

Fajri Yusmar — 2024-02-20

The Strut and Tie Method (STM) is one effective method for predicting the ultimate strength, failure modes, and behavior of reinforced concrete pile caps. However, the use of the strut and tie method in pile cap design in Indonesia is not as popular as the use of conventional methods. This study aims to evaluate the reinforcement design of pile caps using conventional methods and the finite element method (FEM) approach, utilizing the strut and tie method specified in SNI 2847 2019. The analysis results show that the required area of longitudinal reinforcement in the conventional method does not meet the criteria when evaluated using the STM method. The deficiency in the longitudinal reinforcement area amounts to 40.13% compared to the design results obtained using the STM method. Meanwhile, the use of the FEM method results in a required reinforcement area that exceeds the required area for the STM method. The difference in reinforcement is even greater, reaching up to 7.85% for the FEM method.

Implementation of Construction Safety Plan in The Building Project

Patria Yoga Pratama Hadi — 2024-02-20

Data on work accidents in the construction industry in Indonesia is still relatively high, so the government issued a Construction Safety Management System (CSMS) regulation in 2021. However, many middle to lower-class contractors still need help compiling it. Contractors still use job safety analysis as a substitute for the Construction Safety Plan (CSP) with minimal analysis. Therefore, it is necessary to research the preparation of CSP, which is integrated with the project technique method. The research method used is to describe CSP implementation in selected project cases. The study results show that contractors already have good resources and commitment to carrying out CSP but have limitations in understanding the techniques for preparing CSP documents accompanied by sound risk management analysis.

Seismic Risk Analysis of Government Buildings in the City of Tembilahan using FEMA P-58

Rofriantona — 2024-02-20

Research in estimating losses and harm experienced by structures in the high seismic zone had been conducted in previous studies. Yet there is limited study carried out in low-moderate seismic areas. Therefore, an accurate method for calculating losses incurred due to earthquake events is needed in assessing the performance of building structures. This study aims to analyze the seismic risk of government buildings in Indragiri Hilir Regency Riau Province according to FEMA P-58. Seismic risk analysis was carried out on four reinforced concrete buildings. The four buildings reviewed in this study were categorized as low-rise buildings (Immigration Office) and medium-rise buildings (Regent's Office, Puri Husada Hospital, and Rusunawa). The buildings’ location according to SNI 1726-2019 was categorized as soft soil class. The results showed that the Immigration Office, Regent's Office, Puri Husada Hospital and Rusunawa were in a safe state. This is drawn by the value of the collapse probability in the current search condition, which is lower than the value of the collapse probability in the upper bound condition. Regent's Office and Rusunawa were the most vulnerable buildings where the value of the mean loss probability was the highest, namely 23.2%.

Shear Reinforcement of Existing Reinforced Concrete Beam Using Deep Embedment Method

Ilham Akbar — 2024-02-20

The load capacity of old reinforced concrete structures must be increased to meet current standards. This might be due to increased load needs, inadequate shear provisions in the original design, material degradation, or rising demands for shear capacity related to flexural strengthening. This research demonstrates a method that effectively repairs RC beams using embedded steel bars. Loading history was reproduced in the form of cracking within the elastic range in 2000 x 150 x 200 mm beam. The beam was repaired and then reloaded to failure in the experimental test. The results show that the contribution of steel bars embedded in the core of the RC beam to the load capacity can be significant. The highest initial stiffness of the strengthened beam was 13,07 kN/mm, which was 69% higher than the control beam, while the maximum load of the strengthened beam was 43 kN with the deflection at 13,00 mm, 43% higher than the control beam. The cracks developed during the reinforced beam’s second load phase were identical to the first, and the shear capacity increased more than the control beam.

Tsunami Simulation in Paseban Beach Using Nesting Method on Delft3D Modeling

Maulida Faradella — 2024-02-20

Paseban Beach is an area that has the potential for a tsunami hazard. In analyzing the tsunami hazard, accurate data and methods are essential. Therefore, this study aims to conduct a tsunami hazard analysis using the nesting method to obtain precise modeling results. This study utilizes the Delftdashboard and Delft3D-Flow programs. The modeling of the 1994 Banyuwangi tsunami results show that the validation stage has an accuracy of 7.94%, which means it is very accurate. The tsunami modeling using the 8.7 Mw megathrust earthquake showed the tsunami wave height in Paseban Beach reached 10,25 meters with 46 minutes arrival time. The length of the tsunami inundation was measured to be 2.96 km, with a run-up height of 2.98 meters.

Numerical Study of Strengthened Spun Pile with Concrete Infill and Steel Jacket

Stevany Lydia Jedidjah Hugen — 2024-02-20

The confinements in a spun pile in Indonesia are below the minimum requirement mentioned in ASCE 7-16. Since Indonesia still adopts the linear elastic concept for foundation design, where the pile should be designed strongly without damage, the deficiency does not matter. However, enormous piles are required to keep it elastically under severe earthquakes. Hence, a transition to performance-based design (PBD) should be prepared since the seismic acceleration tends to increase. PBD requires sufficient transverse reinforcement to ensure flexural failure. Steel jacket is proposed to overcome the lack of confinements, particularly on the pile cap connection where the largest curvature occurs. Experimental and numerical studies have been conducted on a full-scale spun pile-to-pile cap connection with a steel jacket under cyclic loading. A monotonic pushover analysis with Opensees Navigator open-source software was performed for further study.

Zero Emission Guide by The Last Indonesian Minister Regulation of 2022 Uses Blockchain – BIM for Green Efficiency

Priyawan — 2024-02-20

As a result of climate change poses a threat and crisis that is currently sweeping the world; one of them is causing drought, rising sea levels, melting polar ice, and heat waves; therefore, the target towards Net Zero Emission (NZE) in 2060 must be an obligation in all countries. Green Building (GB) is a building that meets Building Technical Standards, and It has demonstrated demonstrable success in conserving resources such as water, energy, and other resources. The application of GB principles following the function and classification in every stage of its implementation is expected to reduce greenhouse gas emissions. This research aims to analyze the cost of improvement work based on GB assessment, which is an influencing factor in applying the regulation from the Minister of Public Works and Public Housing (PUPR) Indonesian government. The Technical Guidelines for GB, through the Minister of PUPR No.1 of 2022, is the latest regulation in Indonesia. Blockchain- Building Information Modelling (BIM) and the Implementation of GB using Structural Equation Modelling–Partial Least Square (SEM-PLS) for the analysis. Applying Blockchain-BIM to overcome the cost constraints is proven to increase the cost performance of GB in modern shopping center buildings by 3 - 3.8% in the Basic rating. It is higher when selecting a zero-emission approach for other ratings, dramatically affecting the required green costs.

Mapping of Risk Levels and Types of Ground Movement in South Sumatra

Erlangga Saputra — 2024-02-20

The western part of South Sumatra Province is situated near Bukit Barisan. Therefore, the topography is characterized by hills and mountains. This condition makes the area vulnerable to ground movement. Information on the risk level and type of ground movement is very important for the region's development. This paper presents the mapping of risk level and type of ground movement along the national road system in South Sumatra Province. The map was developed based on slope condition data collected and tabulated in the Slope Management System developed by the Ministry of Public Works based on several parameters. These parameters were processed and analyzed using ArcGIS software. The risk level is classified as low, medium, high, and very high. The type of ground movement is categorized as debris flow, rock fall, slope failure, rock mass failure, embankment failure, rotation failure, and translation failure. The study uses data from 2018 and 2021. Results show that most ground movement on road segments 36, 37, 38, 18, 19, and 21 is slope failure. The map suggests an increase in the number and level of risk of slope failures from 28 in 2018 to 45 in 2021. The map could be used as preliminary information but not as a replacement for slope surveys and investigations.

Effect of Sawdust Addition on Thermal Conductivity of Clay Bricks

Abely Aliya Bahar — 2024-02-20

This research was conducted to find an alternative to the brick wall constituent material with the lowest thermal conductivity value by adding sawdust. The method of measuring the thermal conductivity value used is the steady-state hot plate method. From the test results obtained the more the addition of sawdust, the value of thermal conductivity obtained is also increasing. With the best conductivity value obtained by the author is in the addition of sawdust as much as 5 grams with a conductivity value of 0.006573945Q W/mK.