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Numerical Analisys of Segmental Box Girder’s Stress with Eccentric Tendon Anchoring on Balanced Cantilever Box Girder Bridge
Get PDFDiagonal crack damage on the web of balanced cantilever box girder bridges has frequently occurred worldwide, including in Indonesia. Previous studies have shown that these cracks can result from additional shear stress caused by prestressed tendon anchoring. In this study, an analysis was conducted using a 2D element model verified through a numerical approach. The evaluation of box girder web stress values was used to assess the potential for cracking and confirm the results of crack mapping conducted on site. The research found that shear stress from prestressed tendon anchoring increases the total shear stress on the box girder web by up to 46.6% of the total shear stress value. The distribution of shear stress from prestressed tendon anchoring is concentrated in the anchoring areas on the top slab and bottom slab sides of the box girder web. The evaluation of principal tensile stress shows that the observed crack locations in the field correspond to areas where the principal tensile stress values exceed the allowable design limit
The Influence of Cross Equatorial Northerly Surge (CENS) and El Niño Southern Oscillation (ENSO) on Atmospheric Dynamics in Western Indonesia
Get PDFIndonesia is located between the Asian and Australian continents, making its weather and climate significantly influenced by the atmospheric conditions of both continents. Differences in solar radiation received by high-latitude regions and the equator lead to pressure differences, resulting in airflows from high-pressure areas to low-pressure areas. This study analyzes atmospheric dynamics parameters during the occurrence of Cross Equatorial Northerly Surge (CENS) and El Niño Southern Oscillation (ENSO) in Neutral, La Niña, and El Niño phases. The analysis compares atmospheric dynamics during CENS-ENSO Neutral, CENS-La Niña, and CENS-El Niño events. The focus is particularly on part of the CENS propagation area, including the southern South China Sea to the western Java Sea. The data used in this study include ERA-5 reanalysis pressure level data, ERA-5 reanalysis single-level data, and CMORPH High-Resolution Global data with a spatial resolution of 0.25° x 0.25° and hourly temporal resolution. The results indicate that CENS during ENSO affects sea surface temperature, outgoing longwave radiation (OLR), precipitation, moisture transport, and divergence over Western Indonesia, particularly in southern Sumatra, the Java Sea, the northern coast of Java, and the western to southern coasts of Kalimantan
Comparative Study on Artificial Intelligence Methods in Housing Price Prediction
Get PDFThe demand for property, including houses, continues to grow rapidly in Indonesia. The housing price prediction is essential in assisting the stakeholders such as buyers, sellers, and investors to make better decision-making. There are many key factors that influencing the housing prices and it is challenging to identify the most relevant factors. This study provides a comparative analysis of various methods in the housing price prediction that consists of one traditional method, Linear Regression (LR), and three artificial intelligence (AI) methods, including Artificial Neural Network (ANN), Classification and Regression Tree (CART), and Chi-Squared Automatic Interaction Detection (CHAID). The aim is to find the best machine learning method in predicting the housing price in terms of prediction accuracy through the four performance indicators and one combined performance index called the reference index (RI). The main findings of this study is that the AI-based method, the ANN method, has the best accuracy indicated by its highest RI value hence outperforming other methods in predicting the housing prices
Seismic Evaluation of Graha 10 Nopember Building Using Indonesian Earthquake Hazard Deaggregation Map 2022
No full textThe occurrence of large-scale earthquakes in Indonesia is still one of the phenomena that often occurs, this can cause damage to buildings, so applying standardization of earthquake-resistant buildings during construction is necessary. This study review was carried out on Graha Sepuluh Nopember building using evaluation method to earthquake-resistant buildings regulated in Indonesian Earthquake Hazard Deaggregation Map (Pusgen, 2022). The model was evaluated using nonlinear time history analysis in order to obtain behavior in post-elastic conditions. The result of this research uses parameters of displacement and plastic hinge, indicates that the building has immediate occupancy performance level means that the building structure is safe, structural failure is not significantly damaged and can be used again immediately.Keywords Nonlinear time history analysis, Indonesian earthquake hazard deaggregation map, earthquake-resistant building, ground motio
INTERACTIVE EFFECTS OF SPAN LENGTH AND RAFTER ANGLE ON THE DUCTILITY AND STABILITY OF STEEL WAREHOUSE STRUCTURES
Get PDFThe warehouse frame is a specialized steel structure requiring more complexcalculations than standard portal frames. This study investigates the impact ofrafter angle and span length on ductility and stability. Results indicate thatincreasing span length enhances ductility but reduces stability due to higher storydrift. For example, M1 (10-meter span) shows a ductility of 4.62 and story drift of13.64 mm, while M3 (20-meter span) achieves 5.07 (+9.62%) with a drift of 46.77mm. A larger rafter angle slightly increases ductility but decreases stability. M1 (10°angle) records 4.62 ductility and 13.64 mm drift, whereas M7 (20° angle) reaches4.71 (+1.79%) with 16.92 mm drift. Higher structure stiffness reduces ductility butboosts stability. M3 (128.29 kN/m stiffness) shows 5.07 ductility and 46.77 mmdrift, while M12 (192.67 kN/m) records 4.96 (-2.17%) with 29.68 mm drift. DespiteM12's minor ductility reduction, M3 demonstrates better elastic-plastic behavior.These findings reveal a clear polarity between ductility and stabilit
Phylogeographic Study of Betutu Fish (Oxyeleotris marmorata) Interpreted Using DNA Barcodes in Three Rivers in East Java Region, Indonesia
Get PDFBetutu (Oxyeleotris marmorata) is a freshwater fish of high economic value widely consumed in Southeast Asia. Overfishing in nature has resulted in a decline in population and genetic diversity. Genetic diversity is an important factor in the long-term survival of O. marmorata populations. This study aimed to analyze the genetic diversity and phylogenetic relationships of O. marmorata in three rivers in East Java (Bengawan Solo River, Kali Tengah River, and Bondoyudo River) using a DNA barcoding approach. Twenty-two fish specimens were collected, identified, and analyzed using PCR and DNA sequencing. The results showed that O. marmorata from the three locations had a low level of genetic variation, with genetic distance differences between 0.00-0.02. Phylogenetic analysis showed that specimens from East Java were closely related to populations from Thailand and Australia. This study emphasizes the importance of genetic conservation and population management with the development of hatcheries to reduce dependence on natural catch
Application of ARIMA-Decomposition in Forecasting Coffee Exports in Indonesia
Get PDFCocoa is one of Indonesia's primary commodities, playing an important role in the national economy, particularly in the agricultural and export sectors. However, Indonesia's cocoa exports have shown a declining trend in recent years, caused by a reduction in cocoa production. Therefore, more accurate forecasting is needed to support effective decision-making and maintain the competitiveness of this commodity. This research aims to obtain forecasts for cocoa exports in Indonesia using the ARIMA-decomposition method. The data used is secondary data obtained from the Central Statistics Agency's publication website. The data used is monthly data from 2014-2024 using the ARIMA-decomposition method The cocoa export variable referred to in this research is the volume of cocoa exports in Indonesia per month. The research results show that there are two models obtained, namely the ARIMA (1,0,0) and ARIMA (0,0,1) models. The ARIMA model (0,0,1) is the best because it has a smaller RMSE value than the ARIMA model (1,0,0). With results of forecasting cocoa export values using the hybrid ARIMA-decomposition method, namely January 2024 is 90,756,803.63, February 2024 is 94,087,978.29, March 2024 is 100,169,842.39, April 2024 is 90,693,529.69, May 2024 is 93,809,122.09, June 2024 is 100,601,810.69, July 2024 is 99,660,519.59, August 2024 is 105,630,962.89, September
Analysis of Temporary Preloading for Bridge Approach Embankment to Eliminate Secondary Compression Case Study: Probolinggo – Banyuwangi Toll Road Construction Project Section 3 STA 40+550
Get PDFProbolinggo - Banyuwangi Toll Road is part of the National Strategic Project, has a length of 172 km which is divided into 7 sections. One of the challenges faced is soft soil, where information is obtained in section 3 precisely STA 40 + 550 there is soft soil, which has low bearing capacity and high compressibility. The depth of the soft soil itself reaches 10 meters, with the plan to build in the approach bridge area which has a 10 meter high embankment. Considering the high embankment, based on previous studies, it is estimated that the amount of primary and secondary compression generated is quite large. This study analyzes primary, and secondary compression in bridge approach embankments built on soft soil, focusing on eliminating secondary compression using the preloading method, while the primary compression time is accelerated using Prefabricated Vertical Drains (PVD). Primary consolidation results in a 1.35-meter settlement, and secondary settlements vary over 20 years. From the analysis, it is found that the annual rate of secondary settlements decreases after year 10, so it is considered that the year 10 settlements are eliminated. To eliminate these settlements at year 10 of the operational period, the required embankment height increases by up to 13.60 meters of granular backfill, preloading of 4.49 t/m2 is equivalent to 2.26 m, and the height of the embankment to be demolished is 1.85 m
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No full textHandling Selection of Compression And Stability Problems of Embankment Based on The Thickness of Soft Soil Layer Below (Case Study: Rengat – Pekanbaru Toll Road Project Sta. 176+775 – Sta. 176+975) Pandu Hermawan, Noor Endah Mochtar, Indrasurya B. Mochtar, & Mahar MuliawanSlope Stability Analysis Under Dry-Wetting Cycle Conditions (Case Study: Landslide Countermeasure of Batas Pidie/Aceh Besar - Batas Kota Sigli)Zulfadhli, Trihanyndio Rendy Satrya, Ria Asih Aryani Soemitro & Fikri AfzalAlternative Planning Slope Stabilization On Roadway Case Study : Landslide On Tabone-Polewali Road Section KM 168+790 to 168+820 Ismi Istiqamah, Mohamad Khoiri, Mahendra Andiek Maulana & Bambang S. RazakStudy of The Behavior of Abutment Piled Foundation due to Nearby Staged-Embankment (Case Study: Kali Kandang Bridge on The North Ring Road of Lamongan) Azkiya Nabila, Trihanyndyo Rendy Satrya, Ria Asih Aryani Soemitro, Sifa UdukhaBehaviour Study of Abutment Pile Foundation on Lightweight Embankment Oprit(Case Study: Kali Otek Bridge – Lamongan North Ring Road Construction Package Section 2)Nila Wahyu Pertiwi, Ria Asih Aryani Soemitro, Trihanyndio Rendy Satrya, Sifa' Udukh
Study of The Behavior of Abutment Piled Foundation due to Nearby Staged Embankment (Case Study: Kali Kandang Bridge on The North Ring Road of Lamongan)
Get PDFKali Kandang Bridge is built on soft soil with low bearing capacity that uses a combination of Preloading, Prefabricated Vertical Drains (PVD), and Prefabricated Horizontal Drains (PHD) that require a long time to achieve a 90% consolidation degree. During the consolidation process, there is no other work that can be done. To increase time efficiency, shorten the PVD spacing or manage two or more works, such as piling bridge abutment, staged embankment, and consolidation process simultaneously can be done. But, embankment above soft soil near piled foundation can give additional forces to the pile so the study of behavior of abutment piled foundation due to nearby staged embankment and degree of consolidation should be done. This study analyzes the effects to piles if piling is carried out after consolidation is complete. Then, it analyzes the effects of variation of the PVD spacing of 0.75 m and 0.50 m, variations in embankment stages of 0.75 m/day, 1.00 m/day, and 1.25 m/day and variations in piling at various degrees of consolidation ranging from 10% to 90%. From the analysis, it was found that the variation of PVD installation spacing of 0.75 m and 0.5 m and the variation of embankment phasing of 0.75 m/day, 1.00 m/day, and 1.25 m/day did not provide a significant effect on either the soil settlement and consolidation time or the lateral deflection, pile settlement and forces in piles. On the other hand, pile driving at different consolidation degree variations showed a significant effect. The most critical condition where the foundation pile received the largest additional forces was on the foundation pile driven at a consolidation degree of 10%