Jurnal Teknik Sipil

Cover & Editorial Page Volume 20 Issue 1 April 2024

Jurnal Teknik Sipil Universitas Kristen Maranatha — Mon, 01 Apr 2024 00:00:00 +0000

Cover & Editorial Page Volume 20 Issue 1 April 2024

IDF (Intensity-Duration-Frequency) Curve Analysis of Ibu Kota Negara (IKN) Watersheds

Azarya Bees, Ni Made Candra Partarini — Mon, 01 Apr 2024 00:00:00 +0000

The area of Ibu Kota Negara (IKN) in East Borneo is a strategic area that is projected as the new capital city of Indonesia therefore it requires water resources infrastructure to support development of IKN. IDF curve analysis of the IKN watershed is expected to be able to estimate the amount of rainfall intensity with various return times to design various types of water structures such as drainage, culverts, and flood canals. Rainfall data in the form of daily data is a consideration for conducting IDF curve analysis using the Mononobe equation and the Sherman equation. The distribution of rainfall of the IKN watershed follows the Log-Normal distribution and produces design rainfall values with various return times such as 2, 5, and 10 years. The trend of rainfall intensity of the IKN watershed shows that rainfall intensity decreases as the duration of rainfall increases. The Sherman equation is known to give higher rainfall intensity values than the Mononobe equation at short durations of less than two hours while for durations of more than two hours, the opposite occurs. The maximum rainfall intensity is 419.67 mm/hour at a return period of 100 years at a duration of 5 minutes or 0.083 hours. The minimum intensity is found at a duration of 5 hours with a return period of 1.1 years amounting to 7.74 mm/hour. While the results of the analysis with the Sherman approach, with the same return period and duration, obtained a maximum value of 231.42 mm/hour and a minimum value of 10.88 mm/hour.

Analysis of the Floodwater Profile of the Way Sikula River in Ambon City Using HEC – RAS

Mon, 01 Apr 2024 00:00:00 +0000

The Way Sikula River is one of the rivers in Ambon City with a length of 22.55 km. The Way Sikula River is in the Way Sikula and Air Manis watersheds. In July 2022, there was a flood downstream of the river which resulted in paralyzed road access to Ambon City and West Leihitu District. In this regard, it is necessary to analyze the profile of the flood water level in the river which is expected to become a flood control plan in the future. Calculation of flood discharge in the Way Sikula River for return periods of 2, 5, 10, 25, and 50 years used the rational method using rainfall data from the BMKG Pattimura Ambon station and Gunung Nona Ambon Post Station in 2012 - 2021. The results of the flood discharge calculation for the 2012-2021 period. 2nd, 5th, 10th, 25th and 50th year respectively are 99,51 m³/s, 130,47 m³/s, 150,36 m³/s, 168,87 m³/s and 192,74 m³/s. Floodwater profile analysis using HEC-RAS ver. 5.0.7. From the simulation results it is known that the Way Sikula River began to overflow at the Q2 year flood discharge in all simulated cross sections with a flood overflow height at a 50 year flood discharge reaching 1,86 meters.

Effect of Coefficient Nk on Gedebage Soft Soil Shear Strength Based on CPTu Test

Asriwiyanti Desiani, Daud R. Wiyono, Adrian Pramono — Mon, 01 Apr 2024 00:00:00 +0000

Cone Penetration Test field instrument, also commonly refered to as sondir, has been commonly used in Indonesia. However, the usage of Cone Penetration Test in combination with pore water measurement (CPTu) is not yet used widely, which is why this research is conducted in situ by using CPTu instrument. In situ testing has a few advantages, such as:soil parameters are obtained under actual stress conditions, continous data can be obtained along the depth of soil, and it overcomes sampling problems or sample interferences. Location of this research is in Gedebage area of Bandung which currently undergoes major development. Soil in the area are soft soils which commonly have low shear strength. Soft clay shear strength (S_u) can be determined by the ratio of net cone resistance and conus factor (N_kt). Further research on N_ktcoefficient on soft soil shear strength evaluation based on CPTu test results are going to be verified by using laboratory testing. The research shows that N_ktcoefficient which are suitable for Gedebage area ranges from 13 - 15. Range of shear strength parameter based on the laboratory test and in situ CPTu test calculations are as the following: depth of 0-10 m S_u>25 kPa, depth of 10 - 25m S_u is around 10 kPa, and depth of 25 - 31m S_u > 100 kPa.

Quality Control Production of Concrete Tunnel Segment Based on Six Sigma Method in the Mass Rapid Transit Project

Hamonangan Girsang, Ichsan Chamami — Mon, 01 Apr 2024 00:00:00 +0000

Development infrastructure construction of MRT Jakarta Project Phase 2A with length is 5.8 kilometers consist of seven underground stations, production concrete tunnel segment done by XY company as the ability to meet the quality of Japanese Industrial Standard provides added value to the company. However during the production process concrete tunnel segment products often defects. This is in line with production report within 4 weeks which found defects. This study aims to determine the percentage of defects in the production of concrete tunnel segment and determine the factors causing occurrence of defects than improvements can be made to control production quality. The six sigma analysis method was used in this study by carrying out five stages of analysis are define, measure, analyze, improve, and control. This study result is average percentage of defects occurred is 5.80% with a total chipped defect of 54.21%, cracks 30%, chipped and cracks 15.26%, and rejects 0.53% with an average sigma level of 3.07. Factors are very decisive in controlling the production quality of the concrete tunnel segment are work methods, people management and tools, where are three factors a direct role during the production work process.

Groundwater Quality Analysis in Beru Village, Jereweh District, West Sumbawa Regency

Junaidi Efendi, Amirul Hilmi, Andi Maria Ulfa — Mon, 01 Apr 2024 00:00:00 +0000

Water is a very important basic need for human life. The fulfillment of water needs in Beru Village is highly dependent on groundwater, which is extracted by digging wells. Due to the community’s dependence on the availability of well water, it is very important to monitor and assess groundwater quality in Beru Village. The lack of related research makes this research very important to do. The purpose of this study is to analyze groundwater quality in Beru Village, Jereweh District, West Sumbawa Regency. Water quality test parameters use the parameters include pH, temperature, conductivity, TDS, and DO. The average values of each parameter sequentially are 7.07; 30.18^OC; 752.71 µS/cm; 377.91 mg/L; and 4.83 mg/L. On average, the quality of groundwater is classified as good and meets the required quality standards. Based on pollution index calculation, water quality based on parameters pH (PI_j=0.92) and TDS (PI_j=0.497) is classified as good, while water quality based on parameters temperature (PI_j=1.079) and DO (PI_j=1.162) is categorized as slightly polluted but relatively safe to use for sanitary hygiene needs.

Design of Self Compacted Concrete Mix Based on Maximum Compressive Strength and Mortar Flow Using Air Dried Aggregates

Margeritha Agustina Morib, Hironimus Firnius Zai, Ninik Ariyani — Mon, 01 Apr 2024 00:00:00 +0000

The use of Self Compacted Concrete (SCC) in construction industry continues to grow. Different levels of work complexity require varying flow rates and SCC compaction capabilities. Mix design for SCC cannot be defined precisely because there are many parameters involved. This study used a stepwise design method by determining maximum fly ash composition for type I cement substitution which produced highest mortar compressive strength. Superplasticizer added to produce flow mortar more than 250 mm. Air-dried Progo Sand (Gradation IV) and air-dried Clereng Gravel size 4.8 mm – 9.6 mm was used. SCC was obtained by adding gravel into mortar using coefficient of 1.4; 1.6 and 1.8 from 1 m³ volume of agregat cavity. Fresh concrete rheological tests include slump flow, v-funnel, L-box and segregation resistance to determine SCC class. The compression test of 3 cubes mortar for each variation was carried out at 3 days while 3 cylinder SCC compression test for each variation was carried out at 3 and 28 days. Cement substitution with 10% fly ash and 1.8% superplasticizer gave flow mortar of 320.65 mm and compressive strength of 22.07 Mpa was chosen as the SCC mortar. SCC using coefficient of 1.8 produces compressive strength of 30.48 MPa.

Comparative Analysis of Conventional Steel Building Structural Systems and Diagrid Structural Systems with Different Diagonal Member Configurations

Bima Candra Nugroho, Relly Andayani — Mon, 01 Apr 2024 00:00:00 +0000

Diagrid is known as a grid structure where the exterior structure of the building is diagonal, this is one of the most innovative and adaptable approaches and also evolved into its use for high-rise buildings. Diagrid is formed from diagonally shaped frames that are interconnected by materials which can be steel, concrete or wood. The purpose of this study is to determine the performance of the diagrid building structure and how the optimal diagonal member configuration for the diagrid building is. There are 6 types of buildings to be reviewed, consisting of 1 conventional building type and 5 diagrid building types, namely diagrid type 2L20M with diagonal members slope of 33,94°, diagrid type 4L10M with a diagonal angel of 53,39°, diagrid type 8L5M with a diagonal angel of 69,62°, type 10L4M diagrid with a diagonal angle of 73,45° and 20L2M type diagrid with a diagonal angle of 81,55°. The buildings will be analyzed using the ETABS program and following the SNI regulations in Indonesia. The performance result to be compared include cross-sectional dimensions, total structure weight and base shear, service limit performance and time period. The result analysis show that the diagrid building has better structural performance. The diagrid model with the most optimal performance is the 10L4M type with a diagonal member length of 36,51 meters that extends up to 10 floors with a module height of 35 meters and an angle of 73,45°. Diagrid model with the second-best performance is type 8L5M, then in third place is type 4L10M and in fourth place is type 20L2M. The diagrid building with the lowest performance is the 2L20M type which has no better performance than conventional buildings.

Effect of adding Red Brick Powder and Polyethylene Terephthalate in Clay.

Ririn Tri Eryunaningsih, Sri Wulandari — Mon, 01 Apr 2024 00:00:00 +0000

Low bearing capacity soil is frequently encountered when designing the construction of civil buildings. It's important to stabilize the soil.. In this study, the effectiveness of PET plastic and red brick powder as clay stabilizers was examined. The silica and alumina oxide included in the red brick powder can bind soil particles to form a compact, stable structure. PET plastic can increase the friction between soil grains and reduce the potential for swelling. Soil samples were taken from Hambalang, Bogor Regency. Data was obtained by conducting soil investigations at the Civil Engineering Laboratory of Gunadarma University using experimental methods. The parameters analyzed were the values of shear strength and consolidation in the original condition and soil samples that had been given a mixture of 0.5% PET plastic and red brick powder with a percentage of 7%, 11%, and 15%. According to research, red brick powder and PET plastic can boost soil strength based on soil shear and consolidation parameters. The percentage of the effective mixture is soil with 0.5% PET plastic and 11% red brick powder, with a rise in shear strength of 259.947%, a drop in consolidation time speed of 64.214%, and a decrease in land of 57.116%.

Analysis of the Impact of Traffic due to Tuban LPG Terminal Operation

Ahmad Soimun, Jimi Amijaya, Wahyu Padma Baskara, Ni Komang Novia Krisnayanthi — Mon, 01 Apr 2024 00:00:00 +0000

Refrigerated LPG Terminal is a facility that handles liquefied gas as a raw material, ensuring a reliable supply of LPG for the community. Located in Remen Village, Jenu Subdistrict, Tuban Regency. The intensity of land use changes in an area will correspond to changes in the transportation system in that area. The construction of an LPG terminal will undoubtedly have transportation-related impacts in the area. Therefore, efforts are needed to address these issues by formulating traffic engineering management that is tailored to the actual conditions. The method used involves observational surveys such as Trips Attraction Survey and Origin Survey, which focus on inventorying the roads around the construction area. The impact analysis method of development using MKJI is employed. The analysis of the impact of the development of PT. Pertamina LPG terminal shows that from the existing condition before the development, during the construction phase, and at the early operation stage, it does not significantly affect the capacity of the existing roads in the area. In the forecast period of the next 5 years, there will be an increase in the road capacity value of DJ during the morning peak from 0.248 to 0.334. Regarding the level of service (LOS), it remains at level B for the existing period, construction phase, and early operational stage. By analyzing using forecasting methods, alternatives that can be planned include traffic control systems, understanding the road network system around the area, providing public transportation, installing traffic signs, providing parking facilities, and minimizing roadside parking.

Analysis of the Drainage Capacity of Piere Tendean Street, Banyuwangi with Software EPA-SWMM

Dean Alif Gibran, Ririn Endah Badriani — Mon, 01 Apr 2024 00:00:00 +0000

Community growth and increasing change over land functions made the road infrastructure unable to hold the runoff water that leads to the drainage. The area for the piere tendean road study became one of the areas in the city of Banyuwangi that have been flooded each year since 2015. The main factor that causes bad drainage lines is too narrow channels, the amount of garbage that covers the lines, and the high rainfall rates in the region. An analysis of the capacity of the channel was needed to see if the drainage line was still able to accommodate the runoff of water by using the 25-year for simulation flooding that ran into the drainage. Software environmental protection agency-storm water management model (EPA-SWMM) is one of the modeling applications that it was designed to reveal flood capacity levels in drainage lines. The research was to identify the flooding of the study area with the EPA-SWMM software at Piere Tendean road. The modeling SWMM was performed with the purpose of simulating runoff discharge of water at 2, 5, 10, and 25 years of age. On the 2 years there were 14 points of flooding. On the 5-year by 3 to flood, the 10 and 25 years increased by 1 to flood. Re-planning with a clogged normalization of the conduit, replacing new dimensions and adding outfall with a 25-year remodel could address the flood on piere tendean road as already done. Ecological drainage along with channel maintenance can minimize floods and standing water in piere tendean road.

Sensitivity Analysis of Offshore Platform Structures Under Varying Scour Depths

Made Suarjana, Willy Kiesin — Mon, 01 Apr 2024 00:00:00 +0000

Several offshore platforms operating in the Java Sea have reported experiencing scour at varying depths, raising concerns about the safety and integrity of these structures. Scouring, an erosion phenomenon that occurs around these offshore platform structures due to their presence, is one of the most common issues encountered. The presence of scour can have a significant impact on the safety of these structures. To comprehend the implications of scour on structural safety, sensitivity analysis proves to be an invaluable tool. Sensitivity analysis establishes a relationship between changes in the safety parameters of the structure, obtained through linear analysis, and the depth of scour. By investigating this connection, sensitivity curves can be generated, enabling a conservative prediction of alterations in the strength parameters of the structure due to scour. In this study, a four-legged jacket platform structure underwent linear analysis under storm and seismic conditions using the SACS software. The scour phenomenon was simulated by adjusting the mudline's elevation beneath the structure, modifying the pile coordinates, reducing the length of piles beneath the mudline, and accounting for soil characteristics at each scour depth in the model. The sensitivity analysis revealed that the safety factors of the upper structural components, connections, and piles decrease at varying rates corresponding to each component type as the scour depth of the platform increases. By implementing these sensitivity curves, engineers and operators can make informed decisions regarding the maintenance and retrofitting of offshore platform structures to ensure their ongoing safety and structural integrity in the face of scour-related challenges. This research provides valuable insights into the critical relationship between scour depth and structural safety, enhancing our ability to protect offshore operations in the Java Sea and similar environments.

Assessment of Residential Satisfaction using Gap Analysis: A Case Study in Naypyitaw City, Myanmar

Pan Ei Phyu, Nursyirwan Effendi, Purnawan Purnawan — Mon, 01 Apr 2024 00:00:00 +0000

This research paper conducts an evaluation of residential satisfaction within government-provided four-storied apartment complexes situated in civil-servant housing areas in Naypyitaw City, Myanmar. As the construction of these apartment buildings continues to address the housing demands of civil servants, comprehending the determinants of residents' contentment becomes paramount. The study encompasses data collected from 500 households through structured questionnaires employing a multi-cluster sampling approach. These questionnaires utilize a five-point Likert Scale format to gauge residents' levels of importance and satisfaction. Gap Analysis is employed to scrutinize the gathered data, ultimately identifying seven pivotal attributes that hold the potential to substantially enhance residential satisfaction. These attributes encompass ceiling height, apartment layout plan, room and corridor dimensions, quantity of rooms, staircase design, neighborhood relations, and proximity to police stations. Based on these revelations, recommendations are tendered, advocating the modification and reevaluation of these attributes in forthcoming housing developments. This underscores the imperative need for creating a livable city by ensuring the provision of essential services in closed proximity to residential areas.