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Eko Walujodjati
Sekolah Tinggi Teknologi Garut
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Journal : Jurnal Konstruksi

 1 
Evaluasi Struktur Beton Bertulang Dengan Sistem Rangka Pemikul Momen Khusus Pada Gedung KORPRI Kab. Garut Abdul Chalid, Nugi; Walujodjati, Eko
Jurnal Konstruksi Vol 22 No 1 (2024): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.22-1.1504

Abstract

To withstand earthquake forces in earthquake-prone areas, especially in seismic design categories 4,5,6 according to SNI 1726:2019, there is a calculation called the Special Moment Resisting Framing System (SRPMK). This research aims to understand the concept of earthquake-resistant buildings, plan reinforced concrete structures according to SRPMK principles, and determine the fulfillment of the Strong Column Weak Beam rule where columns are designed to be stronger than beams. The case study was carried out at the Garut Regency KORPRI building using the Garut Regency spectrum response. This building functions as the secretariat for the district KORPRI management board, as well as providing general administration services. The analysis is carried out by knowing the response spectrum, modeling, entering loads, and load combinations. The results of this research show that to fulfill the Special Moment Resisting Frame System in the KORPRI Garut Regency building, beams with dimensions of 350 x 500 mm and column dimensions of 400 x 400 mm are required and reinforcement is installed by the SRPMK provisions contained in SNI 2847:2019. This calculation also includes compliance with the Strong Column Weak Beam rule, this is related to the calculation of compliance with the SCWB formula in SNI 2847:2019
Analisis Kuat Lentur dan Geser Balok Beton dengan Bundel Tulangan Nurliana, Ade Linda; Walujodjati, Eko
Jurnal Konstruksi Vol 22 No 1 (2024): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.22-1.1532

Abstract

Balok beton bertulang sebagai elemen struktur yang berfungsi menahan lentur dan geser dimana parameter utama untuk menentukan kuat lentur dan geser balok beton bertulang meliputi: dimensi penampang, mutu beton, mutu baja tulangan, ukuran baja tulangan dan jumlah baja tulangan yang digunakan. Dalam konstruksi parameter tersebut umumnya memiliki batasan minimum, seperti halnya dengan jarak tulangan dan dimensi penampang kecil. Untuk mendapatkan elemen struktur dengan penampang kecil namun memiliki kekuatan yang besar, dengan jarak tulangan yang kecil karena luas tulangan yang dibutuhkan besar, maka perlu dilakukan penempatan tulangan dengan cara bundel. Tujuan penelitian ini untuk mengetahui nilai kuat lentur dan geser balok beton tulangan bundel TP 4Φ6 dan balok beton tulangan tunggal Φ12 yang memiliki proporsi luas penampang tulangan yang sama. Analisis dilakukan dengan metode analisis teoritis dengan data yang diperoleh dari hasil eksperimen terdahulu. Berdasarkan hasil analisis diperoleh nilai kuat lentur rata-rata balok tulangan bundel TP 4Φ6 = 8,53 kN.m, dan balok tulangan tunggal Φ12 = 11,31 kN.m. Nilai kuat geser rata-rata balok tulangan bundel TP 4Φ6 = 58,88 kN, dan balok tulangan tunggal Φ12 = 57,92 kN. Dari hasil eksperimen dan analisis diperoleh perbedaan kuat lentur balok tulangan bundel TP 4Φ6 sebesar (6,36%) dan balok tulangan tunggal Φ12 sebesar (48,62%). Sedangkan kuat geser balok tulangan bundel TP 4Φ6 diperoleh hasil yang sama yaitu 58,88 kN dan balok tulangan tunggal Φ12 diperoleh perbedaan sebesar (0,03%).
Analisis Struktur Gelagar Jembatan Steel Box Girder Tipe Komposit Baja-Beton: Studi Kasus : Jembatan Fly Over Jalan Alternatif Kadungora-Leles Walujodjati, Eko; Sauri Al Qurthubi, Sopyan
Jurnal Konstruksi Vol 21 No 2 (2023): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.21-2.1331

Abstract

The Kadungora-Leles alternative road fly over bridge is the first bridge in Garut Regency to use steel box girders as its girders. Therefore, the author is interested in conducting an analysis of the steel box girder structure on this bridge. The method used in the analysis of this bridge girder structure is the Allowable Stress Design method. This analysis assumes that the stress that occurs due to the service load, which is calculated based on the elastic theory of bending beams, does not exceed the specified allowable stress. Permissible stress is determined as the ultimate strength or yield strength of steel divided by the safety factor. Bridge loading refers to SNI 1725:2016, while for analysis of bolted connections using RSNI T-03-2005. From the analysis results, it was found that the steel box girder bridge girder structure experienced a tensile stress of 1801.41 kg/cm2, experienced a deflection of 101.991 mm. After analyzing the girder connections, it was found that the bottom flange connection plate has a shear-yield capacity of 9135000 N, the web connection plate has a shear-yield capacity of 9020160 N. The bottom flange connection plate has a total of 72 bolts (24 mm) , whereas according to the analysis results only 31 bolts are needed. The bolt configuration on the web connection plate has a shear capacity of 11928.992 kN, while the shear force that must be supported is 421.933 Kn.
Perbandingan Pushover dan Pengujian Siklik pada Coupling Beam dan Link Geser dalam Struktur Baja Rachma, Intan Nuriskha; Walujodjati, Eko
Jurnal Konstruksi Vol 21 No 2 (2023): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.21-2.1333

Abstract

The concept of earthquake resistant buildings is based on the yield mechanism in one element. In the steel frame structure core system, the coupling beam functions as an earthquake energy dissipation element where yielding is planned. However, if these elements are damaged, repair costs will be high and the process will disrupt building activities. Considering these conditions, the coupling beam element was developed by adding a sliding link. The yield mechanism is transferred to the link element while the coupling beam remains elastic. Numerical and experimental studies were carried out to review the yielding behavior that occurs in the link and coupling beam elements. The sub-assembly consisting of the column, coupling beam and shear link WF150x75x6x8 was tested under cyclic loading in accordance with AISC 341-10. Numerical analysis is carried out using a pushover method where parameters related to the non-linear properties of each sub-assembly are designed based on the provisions of FEMA-356. The pushover and experimental analysis results show that yielding can be maintained in the link. Cyclic testing on the Sub-assembly produces plastic rotation of the shear link of 0.17 radians without causing damage to the column and coupling beam. The first yield in the pushover analysis occurred at a force of 180.9 kN, while the experimental results occurred at a loading of 157.04 kN. Cyclic testing shows an increase in shear capacity of 7% from the results of the pushover analysis.
Evaluasi Perilaku Struktur Gedung Beton Bertulang dengan Metode Elemen Hingga Proyek Pembangunan Banten Islamic Center Pratama, Rama; Walujodjati, Eko
Jurnal Konstruksi Vol 21 No 2 (2023): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.21-2.1357

Abstract

One type of construction is building construction, an important infrastructure in human life and widely used throughout the world. Building construction can be used for various activities, such as residences, offices, shopping centers, and the like. Therefore, technology that can help make building plans easier and more connected is needed, namely calculating the analysis of the building structure using the finite element method (Finite.Element.Method). The evaluation calculation also refers to SNI`1726,1727, and 2847:2019. The load calculation includes wind, earthquake, dead and live loads. The upper and lower structures are the structural components that are analyzed. The results of the evaluation calculation show that the concrete structure is able to withstand the given loads, seen from the 600 x 600 dimension column where the moment acting on the column is 171 kNm while the moment that the column can withstand is 496.7 kNm with a ratio of 0.346 , so it can be said that the structure is very safe, but in terms of efficiency the material used in the column can be said to be wasteful.
Pengaruh Bahan Tambah Superplasticizer pada Beton Porous Terhadap Kuat Tekan, Tarik Belah dan Permeabilitas Andriansyah, Danil; Walujodjati, Eko
Jurnal Konstruksi Vol 21 No 2 (2023): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.21-2.1386

Abstract

Porous concrete is an innovation in sustainable concrete technology without fine aggregate with high porosity. This porous concrete can be used on road pavement to overcome water run-off, and can also be applied as a retaining wall which functions to minimize ground water pressure. This research intends to examine experimentally the mechanical properties of compressive strength, tensile strength and permeability of porous concrete with various variations in cement water factors. The coarse aggregate used for Cilopang crushed stone is sized 19 mm, 12.5 mm, 9.5 mm and uses added supperlasticizer. The sample used for testing compressive strength and split tensile strength was in the form of a cylinder measuring 15 x 30 cm. Based on the test results according to ACI 522R-10, the test results for porous concrete show that normal porous concrete using supperplasticizer additives has experienced changes in the value of compressive strength and splitting tensile strength compared to normal concrete.
Pengujian Kuat Lentur dan Permeabilitas Terhadap Beton Porous dengan Agregat Kasar Cilopang Ghilman, Rafiqan Mochammad; Walujodjati, Eko
Jurnal Konstruksi Vol 21 No 2 (2023): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.21-2.1387

Abstract

Concrete is a construction material that is currently very commonly used. One of the innovations made is porous concrete or non-sand concrete, which is a simple form of lightweight concrete made by removing fine aggregate. This porous concrete can be used on road pavement to prevent water run-off. This research aims to experimentally examine the mechanical properties of the flexural strength and permeability of porous concrete with various variations in the cement water factor. The coarse aggregate used for Cilopang crushed stone measures 19 mm, 12 mm, 9 mm, for the average load for each sample 19 mm 5.3, 12 mm sample 7.3 and 9 mm sample 8.6. The test specimens used for each variant were 9 concrete block specimens measuring 10 x 15 x 60 cm with different aggregates. Permeability of porous concrete with different coarse aggregate sizes, sizes 19 mm, 12 mm and 9 mm. From these results the speed of absorption is 00 : 12.31 mm/sec for aggregate size 19, 00 : 15.90 mm/sec for aggregate 12, 00 : 24.01 mm/sec for aggregate. Has met the requirements based on (NRMCA, 2011) and (ACI 522R-10).
Pengaruh Limbah Abu Ampas Kopi Garut terhadap Kuat Lentur Beton Marsalina, Sali; Walujodjati, Eko
Jurnal Konstruksi Vol 23 No 1 (2025): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.23-1.1805

Abstract

The development of coffee shop businesses in Garut has contributed to the increase in coffee grounds waste, which can pollute the environment. One of the uses of coffee grounds waste is as a substitute for part of the cement in concrete. Coffee grounds ash contains silica which is pozzolanic in concrete. The purpose of this study was to determine the effect of coffee grounds ash as a partial cement substitute on the flexural strength of concrete. The study was conducted using an experimental method using variations of coffee grounds ash of 3%, 6%, and 9% as a partial cement substitute in concrete with a design quality of K-300 (fc’ 25 MPa) and testing at a concrete age of 28 days. Compressive strength testing was carried out on cube test specimens (15 cm x 15 cm x 15 cm) and flexural strength on beams (10 cm x 18 cm x 60 cm), each with 3 samples per variation. The test was guided by SNI 7656:2012. The results showed that increasing the content of coffee grounds ash reduced the strength of concrete. The average compressive strength of normal concrete is 217.72 kg/cm2, decreasing to 198.20 kg/cm2 with a percentage decrease of (8.96%) at a content of 3%, 182.13 kg/cm2 (16.35%) at a content of 6%, and 150.22 kg/cm2 (31.01%) at a content of 9%. This study shows that although coffee grounds ash has the potential as an environmentally friendly material, its use as a partial replacement of cement in concrete with a content of more than 3% actually weakens the mechanical properties of the concrete. Therefore, further research is needed with a lower substitution content or a combination with other additives to improve concrete performance.
Kajian Struktur Terowongan Proyek Bintaro Jaya Xchange Mall Walujodjati, Eko; Fahmi, Muhammad Zaki; Fathir, Mirza
Jurnal Konstruksi Vol 23 No 1 (2025): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.23-1.1879

Abstract

The construction of the tunnel structure of this mall project is intended for the construction of a tunnel under the Jakarta-Serpong toll road. This tunnel project has a length of 160 m and was built in 2022. The reason for taking this study was to determine how large the capacity is and prove that the tunnel structure is included in the safe and unsafe category of the structure. This research in this analysis was carried out using a manual calculation method and assisted by Microsoft Excel software to evaluate the structural strength, shear capacity, and moment capacity of the beam and column structures. As for the results of the study for the flexural reinforcement in the beam, the Mn value was obtained as 218370.52 KNm and Mu as 4572.55 kNm indicating that the structure or element has sufficient moment capacity to withstand the applied load. Furthermore, for the shear reinforcement, the Vs value is 1326.524 kN and the Vmax value is 1424.079 kN indicating that the shear force provided by the shear reinforcement (Vs) of 1326.524 kN is still below the maximum shear force that can be withstood by the element (Vsmax) of 1424.079 kN. While for the column structure section on the flexural reinforcement, the Pn value needs to be 481.23 kN and the Pnb value of 4,404.27 kN indicates that the structure has met the safety capacity and for the shear reinforcement, the Vu value is 156.40 kN and the value of 179.93 kN indicates that the structure has met the safety capacity. It can be concluded that the tunnel structure is safe and suitable for use by vehicles.
Co-Authors A.A. Ketut Agung Cahyawan W Abdul Chalid, Nugi Andriansyah, Danil Aprilianti, Mega Devi, Marta Resmana Fahmi, Muhammad Zaki Fathir, Mirza Ghilman, Rafiqan Mochammad Intan Nuriskha Rachma Kristalia, Risa Marsalina, Sali Maulidan, Ripan Nurliana, Ade Linda Pratama, Rama Reno Rukanda, Reno Sauri Al Qurthubi, Sopyan Sulwan Permana Wiguna, Andreansyah Yusup, Arip