Jurnal Infrastruktur

STRENGTH OF REINFORCED CONCRETE DOUBLE CANTILEVER BRIDGE PIERHEAD – NUMERICAL STUDY STRUT – AND – TIE - METHOD (STM) SNI 2847:2019

2023-10-30T16:58:57+00:00

Shear stress in the double cantilever bridge pierhead due to geometric discontinuity and load transferred from girder to column have a potentially diagonal crack in the structure. Strut-and-Tie Method (STM) is suitable to design pierheads that resist large shear stress (Piscesa & Tavio, 2020). Today, STM provision has developed with rectangular deep beams (Varney et al., 2015). To expand the application of STM, knowing the behavior of a double cantilever bridge while transferring load, must be verified. The goal of this research is to verify the feasibility of STM SNI 2847:2019 chapter 23 to predict the strength. The structure has been designed using SNI 2847:2019 with 3 specimens (S1-0.3-1; S1-0.4-1.2; S1-0.5-1.5). To find the truss system in the STM using BESO2D programs. The truss system output is analyzed with ETABS. Knowing nominal capacity design with the provision STM SNI 2847:2019. Then investigated ultimate performance used Finite Element Method, FEM software (Abaqus). The finding result is (1) load distribution of each specimen was confirmed same between STM and FEM. (2) Strength ratio, in the specimens respectively at 1.118; 1.09; 1.293, with more than 1 mean design using STM is conservative. (3) Deflection occurs respectively at 12.88mm; 7.96mm; 2.048mm (allowable limit is 18.75mm).

THE INFLUENCE OF ASPECT RATIO OF REBAR-WIRE FIBER ON RHEOLOGICAL AND MECHANICAL PROPERTIES OF SELF CONSOLIDATING CONCRETE

2023-10-30T16:59:02+00:00

It is often observed that compacting device is not applied optimally when faced with difficult placement situations and self-compacting concrete is as one of solution. The production of the concrete is carried out by optimizing aggregate size and proportion as well as certain amount of superplasticizer. In order to improve tensile strength of concrete, then local rebar wire fiber, widely known in Indonesia as Bendrat, can be involved to the fresh concrete, however workability of Self-compacting concrete will be reduced as the aspect ratio of rebar wire fiber increases. This research is intended to discover the effect of aspect ratio of local rebar wire fiber on the mechanical properties of Normal Strength Self compacting concrete. Concrete samples used in this study are 150x300mm concrete cylinder made according to EFNARC recommendation. The diameter of rebar-wire fiber is kept constant namely 0.7mm whereas the aspect ratio varies between 60-100. Compressive strength, Splitting tensile strength and Flexural strength of Self-compacting concrete is obtained by testing of concrete samples according to SNI 1974:2011, SNI 2491:2014 and SNI 4431:2011 respectively. The results showed that Rheological properties of fresh concrete and mechanical properties of self-compacting concrete are highly influenced by aspect ratio of rebar wire fiber. Rheological properties, such as Flowability, Passing ability and Segregation resistance decreases as the aspect ratio increases. Moreover, the research result indicate that Compressive strength of self-compacting concrete is insignificantly improved as the Aspect rasio increase. Optimum compressive strength is obtained from concrete specimens with aspect rasio of 70. On the other hand, the addition of rebar wire fiber on the fresh concrete significantly govern the properties of Tensile strength of self-compacting concrete with the optimum aspect rasio ranging from 70-80.

CONSTRUCTION PROJECT CONTROL ANALYSIS USING EARNED VALUE MANAGEMENT, EARNED SCHEDULE MANAGEMENT, EARNED DURATION MANAGEMENT

2023-10-30T16:59:07+00:00

Appropriate control methods are needed to anticipate potential problems and make construction projects better managed to improve efficiency, productivity, and quality of work. Earned Value Management (EVM) experienced problems in predicting duration because it used two scopes, namely cost and schedule. Then there is Earned Schedule Management (ESM) which monitors project performance through project schedules, but in its application ESM still uses variable costs for its indicators. To make up for the shortcomings of EVM and ESM, another method was developed by Khamooshi and Golafshani, namely Earned Duration Management (EDM) a method for measuring or estimating duration by separating the dimensions of schedule and cost. The purpose of this study is to determine the inaccuracies of the control methods of EVM and ESM in estimating EAC (Estimated At Completion) so that it requires EDM to estimate it. In this research, data collection was carried out in weeks 32 to 59. The data collected in the field was actual project work progress data, actual project financial data, and master plan data. The analysis of Schedule Varian (SV) and Schedule Varian time SV(t) variants shows negative values that result in an estimate of the final duration of the project that is late from the plan inversely proportional to dv which is positive value, meaning that the project is in accordance with the plan. Then the Schedule Performance Index (SPI) and Schedule Performance Index time SPI(t) show a value that is less than one which indicates the project is slower than scheduled, in contrast to the DPI it produces a value equal to one which means the project is in accordance with the plan. The EDM method generates an accurate trend in providing an assessment of the performance of project execution time compared to EVM and ESM. The contribution from research results comparing 3 methods shows that the EVM method produces anomalies in schedule control analysis, so that these deficiencies can be directed towards using the ESM method. while the EDM method, which is less familiar, is more appropriate for use in certain construction cases such as analysis of determining the amount of a claim.

EFFECT OF SILICA FUME SUBSITITUTION IN CEMENT AND ADDITION OF POLYPROPYLENE FIBER

2023-10-30T16:59:08+00:00

To fulfill the needs of construction materials both structural and non-structural in concrete, concrete forming materials are needed that have good resistance to the environment and can also improve the mechanical properties of concrete. One of the materials that can help improve the mechanical properties of concrete is by adding polypropylene fiber and silica fume to the mixture. The addition of silica fume as a substitute for cement is one of the alternatives used to utilize waste so as to reduce the use of cement. besides adding silica fume, the addition of polypropylene fiber can also affect physical properties because one of the advantages of using polypropylene fiber can reduce cracking at a young age. So by adding polypropylene fiber and silica fume into the mixture is expected to increase the compressive strength. In this research, we will substitute silica fume for cement and add polypropylene fibers to the concrete mix. The percentage of silica fume used for cement substitution is 2%, 4%, 6% and 8% while for fiber addition is 1% and 0.5%. From the results of silica fume substitution and the addition of polypropylene fiber, the maximum compressive strength value of the mortar will be sought. From the results of the compressive strength test, the addition of 0.5% polypropylene fiber and the addition of 8% silica fume produced the highest compressive strength, which is around 6.02 MPA.

A STUDY ON ASSESSING CONSTRUCTION SITE SAFETY PRACTICES AMONG CLASS OF CONTRACTORS

2023-10-30T16:59:12+00:00

In recent years, this construction area has been considered as one of the most dangerous industries in which workers are more exposed to the risk of accidents. The Department of Occupational Safety and Health (DOSH) statistics prove that the construction industry has the highest rate of fatal accidents compared to other industries in the country. Therefore, this study mainly focused on the implementation of safety practices in construction industry focusing on among class of contractor A, B, C and D. Regarding to this fact, the main goal of this study is focus on the evaluation of the implementation of safety practices among each class of contractors. This study was started by reviewing literature reviews from journals, thesis, articles, books and web pages. Questionnaire surveys were formed and designed focusing on safety practices in the construction industry. A survey in questionnaire form was carried out to obtain data from the contractor’s class A to D. Subsequently, the data from the questionnaire were analyzed by using the SPSS software. In conclusion, this study also could show the difference of level of safety practices which is applied by every class of contractor in their workplace area that class of contractor C and following by class of contractor D, are contractors which is noted the lowest level in practicing safety work culture in construction. The study also proposes some suggestions and recommendations to improve the safety practices and to minimize the accidents at construction industry.

PARKING NEEDS ANALYSIS AS PART OF THE FEASIBILITY ASSESSMENT FOR PARKING LOT DEVELOPMENT AT POLITEKNIK NEGERI UJUNG PANDANG

2023-11-03T03:11:50+00:00

The growth of motorbike and car users in several regions in Indonesia is quite high. This is because people's movement activities are increasing so the need for transportation is increasing. In Makassar City, the increase in transportation needs is also accompanied by an increase in the number of vehicles every year. Ujung Pandang State Polytechnic is one of the universities with quite high activity and interaction. This is because there is an increase in the number of students from year to year so the growth in vehicle users is greater. The increase in the number of vehicles has quite a big influence on the availability of parking lots, many parking locations have been converted into campus buildings, this condition causes the need for a place that functions to accommodate the number of vehicles each day or what is usually referred to as a parking lot. Based on the results of the research and discussion, it can be concluded that the parking capacity at the Ujung Pandang State Polytechnic is not able to accommodate the number of vehicles every day or what is usually referred to as a parking lot. Based on the results of the research and discussion, it can be concluded that the parking capacity at the Ujung Pandang State Polytechnic is not able to accommodate the number of vehicles every day. The results of the financial feasibility analysis show that the IRR value is greater than the interest rate, namely 14%, while the interest rate 13%. The payback period from the calculation results is 11 years, so the project to build a multi-story parking building facility is financially feasible to build. The need for parking space for the next 5 years on Ujung Pandang State Polytechnic cannot accommodate more vehicles, therefore this research designs a 2-story parking building that can solve the parking problem with an estimated cost of Rp. 55,651,200,000.00

FINANCIAL FEASIBILITY STUDY OF IMPLEMENTING ELECTRONIC ROAD PRICING (ERP) ON AHMAD YANI STREET, MANADO

2023-10-30T16:59:16+00:00

The objective of this study is to evaluate the financial feasibility of the Electronic Road Pricing (ERP) scheme if applied to Ahmad Yani Road Manado. Financial feasibility is feasibility from a private point of view. The motivation for this research is, that the government is encouraging the private sector or business entities to participate in investing in infrastructure development projects including supporting infrastructure such as ERP, thus hopefully the results of this research can provoke investment enthusiasm from investors. Data collection for this study was carried out over 3 days, which are Monday, Friday and Saturday on the 8th, 12th and 13th of August 2022, respectively. The 2014 Indonesian Highway Capacity Manual (PKJI) were used for data analysis. Data collection began with a vehicle volume survey and then calculating the percentage of user who will move to other route with the implementation of ERP. This percentage was obtained by distributing questionnaires to users of the Ahmad Yani Road Manado which was the study location. Then an analysis is carried out for conditions without ERP (Without Project) and with ERP (With Project). This study shows that 48% of the 400 road user respondents choose not to use the ERP road. For a feasibility analysis from a financial point of view, with a planned life span of 10 years, it shows a Benefit Cost Ratio of 2.184 (BCR > 1) and for a Net Present Value of Rp. 320,744,453,901 (NPV > 0) and for the Internal Rate of Return of 44.54% and the Payback Period is 2 years 4 months 9 days, the construction of Electronic Road Pricing (ERP) on Ahmad Yani Road Manado is considered financially feasible.

COMMUNITY PERCEPTIONS OF URBAN TRANSPORT PERFORMANCE

2023-10-31T13:31:39+00:00

Angkutan Kota or commonly called “Angkot” is one of the public transportation that is often found in Bogor. One of the Angkot routes in Bogor is Angkot 03 in the Bubulak-Baranangsiang route. This public transportation has a bad category for the service performance dimension with a poor category. This can be seen from public transportation services such as passenger volume, distance traveled, and stopping at any place to look for passengers. With services in the deficient category, it can reduce people's interest in using public transport in this direction, both for existing users and potential potential users. Therefore, it is necessary to pay attention to the satisfaction of users and the satisfaction of the community around the public transportation route towards public transportation in this direction. The aim of this research is to determine the performance of public transportation services based on the perceptions of public transportation users and the surrounding community. Data from this research were obtained from distributing questionnaires to passangers of Angkot 03 in the Bubulak - Baranangsiang route and people living around the public transportation route. The results of the questionnaire were analyzed using the IPA method to determine the gap between expectations and performance of public transportation services. Based on the results of the analysis, it can be seen that there are the same variables that need to be improved between the perceptions of city transport passengers and the surrounding community, namely variable 12 (Drivers are courteous, kind, and doesn’t smoke).