Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil

Analisis Pengaruh Umur Bangunan Terhadap Tingkat Kepuasan Penghuni

Wed, 22 Nov 2023 07:27:25 +0700

The relationship between residence and well-being, including physical health and emotional state, is widely recognized. Residence quality significantly impacts resident satisfaction, especially for students who require a conducive environment for effective learning. This study examines the impact of building age on resident satisfaction and willingness to pay at the Gadjah Mada University (UGM) dormitory. A questionnaire comprising 20 closed-ended questions evaluates building quality, management, and tariffs, while four questions gauge willingness to pay. With 136 responses from Dorm-50 (over 50 years old), Dorm-15 (over 15 years old), and Dorm-5 (under 5 years old), data is analyzed descriptively through multivariate analysis of variance and price sensitivity meter. Findings show that newer buildings do not always yield higher resident satisfaction. The socioeconomic background of the residents plays a crucial role in assessing satisfaction levels. MANOVA reveals distinct satisfaction levels among the three age groups concerning building quality, services, and rates. Price sensitivity assessment exposes disparities between current rentals and acceptable price ranges for occupants in each dorm. Certain floors or room types exceed acceptable rental ranges.

Cycle Tests and Structure Repair of Bridge Pier Models

Innino Justitiannisa, Riawan Gunadi — Sat, 24 Feb 2024 11:22:27 +0700

This research was conducted in anticipation of the risk of fatal damage to the structure due to the earthquake. In this study, experiments were carried out on the test object in the form of a bridge pillar model, which consisted of 2 test steps. The cyclic test is in the form of a pier bridge model and is continued in step 2 in the form of repairs with grouting and carbon wrapping materials as well as conducting another cyclic test to evaluate the performance of the repair materials used. This study uses the pier model, which consists of two test objects, namely a column with dimensions of 0.25x0.25x1.68 meters and a column cap of 1.20x0.55x0.36 meters. This test provides a constant axial load of 0.2 fc’.Ag and a cyclic lateral load. Phase 1 testing was carried out until the drift ratio was 3.5%. The achieved lateral peak strength is 8,606 tonf with a drift ratio of 2.20%. Lateral strength experienced a decrease in peak lateral strength of 86.93%. The damage is dominated by shear cracks which are characterized by the number of cracks with a diagonal pattern. Structural performance analysis was carried out according to ACI 374.1-05. The results of the theoretical analysis of the peak strength of the pier model were 15.2144 tonnes in the tensile direction, while the experimental ones were 8.606 in the pushing direction and -7.812 in the pulling direction.

Karakterisasi Tanah Vulkanik di Kabupaten Kediri, Jawa Timur, Indonesia Berdasarkan Uji CPT, SPT, dan PMT

Fransisko Wiwarsono, Paulus Pramono Rahardjo, Imam Achmad Sadisun — Sat, 24 Feb 2024 12:23:53 +0700

Indonesia is a country surrounded by the Pacific Ring of Fire so that various areas are dominated by volcanic soil. Volcanic soils have unique and unusual characteristics, different structures and properties from soil in general, and are strongly influenced by geological processes. Volcanic soils were also found to be problematic and caused a lot of geotechnical damage. Research on volcanic soils from a geotechnical perspective in Indonesia is still very limited. This study aims to characterize volcanic materials in Kediri Regency, East Java, Indonesia, based on in situ testing using CPT (Cone Penetration Test), Standard Penetration Test (SPT), and Pressuremeter Test (PMT). CPT and SPT are the most common and frequently used field tests, while PMT is used to obtain horizontal stresses. Some data from the X-Ray Diffraction Analysis (XRD) test and corebox drilling results will also be used in this study. Field test results will display soil classification and parameters, which will then be combined, and empirical correlations will be obtained for site characterization as well as comparisons with other volcanic soil literature studies. The results showed that the volcanic soil in Kediri Regency consists of non-lateritic to lateritic soil. Based on the CPT and SPT correlations, it was found that the qc/N value was greater than in general soils for both cohesive and non-cohesive soils. The authors also found a relationship between parameters and interpretation of PMT data against N_SPT for cohesive volcanic soils in the study area.

Improving Performance in Mixture Porous Asphalt: Application Polyethylene-Terephthalate (PET) and Lawele Granular Asphalt (LGA)

Blima Oktaviastuti, Muhammad Sadillah, Rifky Aldila Primaswo — Sat, 24 Feb 2024 13:04:00 +0700

Plastic has various types, one of which is PET (Polyethylene Terephthalate) plastic, which is often used as a raw material for plastic bottles. One type of asbuton that is often used for road pavement is LGA (Lawele Granular Asphalt) asphalt. Repairs by adding asbuton to the porous asphalt mixture need to be done. This is because porous asphalt has several weaknesses, namely low strength or stability compared to other asphalt mixtures. The addition of PET and LGA waste to porous asphalt is a topic in this article. This research design uses a quantitative design with a type of experimental research. The results of the study concluded that: (1) The results of testing the characteristics of the constituent ingredients of the porous asphalt mixture meet the specifications of SNI, and (2) The test results of the addition of PET (Polyethylene Terephthalate) plastic and LGA (Lawele Granular Asphalt) to porous asphalt mixture meet the specifications by RSNI 2 Design and Implementation of Porous Asphalt Mixture 2012. It is hoped that this research can be an alternative to the mixture of PET plastic waste and LGA asbuton in a porous asphalt mixture. In addition, the newness of this material is expected to also help the construction of roads.

Perbandingan VDF Jembatan Timbang Tanjung Balik Terhadap VDF MDPJ 2017 Berdasarkan Beban Aktual

Almira Nabila Erzag, Leo Sentosa, Benny Hamdi Rhoma Putra — Sat, 24 Feb 2024 13:37:32 +0700

The 2017 Road Pavement Design Manual is a basic reference for road pavement planning in Indonesia, with the provision of a tolerance limit for the overload of 50%. However, the case of violation of the overload that occurs causes a significant increase in the damage to the road. The purpose of this research is to assess the validity of the VDF value in the 2017 MDPJ. This study uses vehicle weight data obtained from UPPKB Tanjung Balik West Sumatra by classifying vehicles, calculating each load distribution, and calculating the VDF value as a value that will be compared to the VDF that has been set in the 2017 MDPJ. Based on the analysis carried out, the VDF values for each vehicle class 6a, 6b, 7a, and 7b were 0.39, 8.17, 9.28, and 4.53, with the determination of the VDF value in the 2017 MDPJ was 0.5, 3.0, 9.8, and 36.9. From these results, it is concluded that the VDF value in vehicle class 6b does not meet the VDF value that has been set so it is necessary to make corrections to the manual.

Efek Molaritas Aktivator (NaOH) pada Beton Geopolymer dengan Bahan Pengikat Limbah Fly Ash PLTU Lontar

Dapit Bawono, Resmi Bestari Muin — Sat, 24 Feb 2024 15:47:40 +0700

The average temperature of the earth's surface has increased by 0.74 ± 0.18°C over the past hundred years, caused by 65% carbon dioxide (CO₂) emissions. Of the total CO₂ emissions, around 6% come from the cement industry. Geopolymer concrete can be a solution to the problem because it does not use cement as a binder, but uses fly ash and activator materials. This activator material is to activate fly ash to become a binder. The aim of this study was to determine the effect of variations in the molarity of the NaOH activator on the workability, setting time, and compressive strength of geopolymer concrete. This study used fly ash from PLTU Lontar with a ratio of NaOH:NNa₂SiO₃ of 1:1.5, then the NaOH was varied with concentration levels of 5 Molar, 8 Molar, 11 Molar, and 14 Molar. From this research, it is known that the molarity level of the activator (NaOH) affects the workability (slump value), setting time, and compressive strength of concrete. The higher the molarity level of the activator (NaOH), the lower the workability of the concrete (the slump value decreases), the slower the setting time of the concrete, and the higher the compressive strength of the concrete. The most optimal variation is 14 Molar NaOH geopolymer with a slump value of 15 cm, initial setting time of 90 minutes, final setting time of 203 minutes, and compressive strength at 28 days of 54.60 MPa.

Analisis Perbandingan Fluid Viscous Damper dan Fixed Base Terhadap Beban Siklik dengan Finite Element

Muhammad Farrel Azhar, Resti Nur Arini, Fadli Kurnia — Sat, 24 Feb 2024 16:51:10 +0700

The geographical location of Indonesia, which is very at risk of earthquake disasters, requires the planning of building structures that are resistant to earthquake risks, one of which is by using base isolators. A base isolator system can improve structural performance by dissipating earthquake energy with its flexibility character to increase the vibration period. One type of base isolator is the Fluid Viscous Damper (FVD), which can be applied to high-rise buildings that often experience destruction during earthquakes. This research aims to determine the energy dissipation and ductility of fixed base structures and structures using FVD with finite element method using ABAQUS application. The object of analysis of this study uses a two-story portal with a steel structure. The results of this study obtained the characteristics of the two building models are semi-ductile, but there are differences in the ductility value between the two models. Based on the calculation results, the deviation ductility value that occurs in the fixed base building model is 2.624. Meanwhile, the deviation ductility of the FVD building model is 4.104. The use of FVD can increase the ductility value by 22%. The dissipation that can be done by the fixed base building model is 0.119, and the energy dissipation value for the building model with FVD is 0.156. Using FVD can increase energy dissipation in the analyzed model by 13.45%.