Articles

INTERAKSI ANTARA GAYA AKSIAL DAN MOMEN PADA KOLOM BETON DENGAN TULANGAN BAMBU Sutarja, I Nyoman; Sudarsana, I Ketut
Jurnal Ilmiah Teknik Sipil Vol. 9, No. 1 Januari 2005
Publisher : Department of Civil Engineering, Udayana University

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Abstract

The use of bamboo reinforcement in reinforced concrete structure has notbeen investigated extensively. The material is expected as an alternative of steel reinforcementin a certain condition. Therefore, this research is conducted to investigatethe capacity of columns reinforcing using bamboo in term of their axial strength andmoment as well as their interactions.Twelve columns reinforcing of bamboo are made and tested. Column dimensions of150 mm x 150 mm x 900 mm were cast using 15 MPa concrete obtained from ASTMstandard cylinder test of age of 28 days. Two group specimens based on its total reinforcementareas were made namely 400 mm2 and 600 mm2. Six variations were madefor each group to incorporate variation of applied load eccentricities during the test.The load eccentricities were 0 (pure axial), 70 mm, 100 mm, 150 mm, 200 mm and ¥(pure bending).Test results show that the experimental interaction between axial force and bendingmoment of the column reinforced with bamboo agree well with the analytical resultsfollowing the expression for column reinforced with steel reinforcement. Taking thetensile strength of the bamboo 50% of the rupture strength, give the experimentalcolumn capacities were close to the analytical results.
PENGUKURAN TOPOGRAFI DI LINGKUNGAN KAMPUS PROGRAM STUDI TEKNIK SIPIL DI BUKIT JIMBARAN UNTUK KEPERLUAN MITIGASI BENCANA Wedagama, D. M Priyantha; Suthanaya, Putu Alit; Sudarsana, I Ketut; Dharmayanti, G.A.P Candra; Budiwati, I.A. Made; Dewi, A.A. Diah Parami; Sudithayasa, I Wayan
Jurnal Ilmiah Teknik Sipil Jurnal Ilmiah Teknik Sipil, Vol. 22, No. 1, Januari 2018
Publisher : Department of Civil Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JITS.2018.v22.i01.p07

Abstract

Mitigasi bencana adalah suatu rencana atau kegiatan yang dibuat untuk meminimalisir korban jiwa dan kerugian material jika terjadi kebakaran atau musibah lainnya. Salah satu cara untuk mitigasi bencana pada suatu institusi adalah titik berikumpul (emergency assembly point) yaitu sebuah tempat atau lokasi yang digunakan oleh masyarakat atau penghuni gedung untuk berkumpul jika terjadi sebuah bencana. Tujuan studi ini adalah untuk pengukuran topografi dan situasi di lingkungan kampus Teknik Sipil Unud di Bukit Jimbaran. Berdasarkan data hasil pengukuran topografi tersebut maka dapat direncanakan posisi titik-titik evakuasi untuk meminimalisir korban jika terjadi bencana. Penentuan titik-titik evakuasi mengacu kepada Peraturan Menteri PU dan National Fire Protection Association (NFPA). Dengan adanya kegiatan ini Program Studi Teknik Sipil berusaha untuk memberikan pelayanan terbaiknya kepada segenap civitas akademika khususnya dari segi aspek mitigasi bencana. Kata kunci: Mitigasi bencana, Pengukuran topografi, Titik kumpul
PERILAKU RUNTUH BALOK BETON BERTULANG YANG DIPERKUAT DENGAN LAPIS GLASS FIBRE REINFORCED POLYMER (GFRP) Sudarsana, I Ketut; Rai Widiarsa, Ida Bagus
Jurnal Ilmiah Teknik Sipil Vol. 12, No. 1 Januari 2008
Publisher : Department of Civil Engineering, Udayana University

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This research was conducted to know the failure behavior and flexural strength of reinforced concrete (R/C) beam strengthened with GFRP sheet. The research used simple supported beams with dimension of 100x150x1100 mm. The beam resisted two concentrated loads at a distance of 300 mm from each support. On the beams were applied 3 conditions that were beam without addition of GFRP sheet; beam with addition of 1 layer GFRP sheet and beam with addition of 2 layers GFRP sheet. The GFRP sheets used in this research were made of woven roving glass fibre mixed with epoxy resin. The data collected in this research were crack load, ultimate load, crack pattern, crack width, deflection and failure behavior. Results of from this research indicated that addition of GFRP sheet decreased the length and width of the R/C beam crack. The addition of GFRP sheet improved flexural strength of R/C beam as well. The addition of 1 layer GFRP sheet increased the flexural strength by 10,8 %, with failure in flexure accompanied by breaking of the sheet. On the other hand, the addition of 2 layers GFRP sheet increased the flexural strength by 13,4 %, with failure in flexure accompanied by debonding of the sheet from concrete surface. This showed that the sheet did not work effectively.
KINERJA STRUKTUR GEDUNG SISTEM GANDA (DUAL SYSTEM) DENGAN BERBAGAI KONFIGURASI DAN POSISI DINDING GESER Sudarsana, I Ketut; Sutarja, I Nyoman; Dewi, Mulya
Jurnal Ilmiah Teknik Sipil Jurnal Ilmiah Teknik Sipil, Vol. 23, No. 2, Juli 2019
Publisher : Department of Civil Engineering, Udayana University

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Abstract

Kinerja struktur suatu gedung dengan sistem ganda dapat menjadi lebih optimal bila penempatan dan penggunaan bentuk dinding geser yang digunakan diperhitungkan dengan baik. Penelitian ini bertujuan untuk mencari pengaruh konfigurasi dan posisi dinding geser pada struktur gedung beton bertulang beraturan dengan mengevaluasi kinerja struktur yang dicapai gedung tersebut. Lima model struktur yang ditinjau terdiri dari 25 tingkat, dengan 2 variasi bentuk dan penempatan dinding geser yang berbeda antar denahnya. Konfigurasi bentuk dinding yang digunakan yakni bentuk I dan L. Struktur gedung berfungsi sebagai perkantoran yang terletak di wilayah kelas situs D dengan kondisi tanah sedang. Denah struktur terdiri dari 5 bentang ke arah X dan 3 bentang ke arah Y dengan lebar tipikal sebesar 5 meter. Tinggi lantai dasar yaitu 4 meter dan tinggi setiap lantai di atasnya sebesar 3,5 meter. Struktur dianalisis dengan analisis statis nonlinier pushover dan dimodel secara 3 dimensi pada program SAP2000. Dinding geser dimodel sebagai kolom lebar agar sendi plastis pada dinding dapat didefinisikan. Evaluasi level kinerja struktur mengikuti FEMA 440. Hasil analisis menunjukkan bahwa seluruh struktur telah mencapai target perpindahan yang telah dihitung berdasarkan parameter dari FEMA 440 dan level kinerja yang dihasilkan mencapai level beyond E atau collapse. Gaya geser dasar desain yang telah dihitung berdasarkan peraturan SNI 1726:2012 juga telah dicapai oleh seluruh model denah struktur. Nilai daktilitas aktual yang dihasilkan oleh struktur dengan dinding geser berbentuk I lebih besar daripada struktur dengan dinding geser berbentuk L.
KUAT TEKAN DAN MODULUS ELASTISITAS BETON DENGAN PENAMBAHAN STYROFOAM (STYROCON) Dharma Giri, Ida Bagus; Sudarsana, I Ketut; Tutarani, Ni Made
Jurnal Ilmiah Teknik Sipil Vol. 12, No. 1 Januari 2008
Publisher : Department of Civil Engineering, Udayana University

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This experiment is aimed to know the value of compressive strength and elastic modulus of concrete by adding granular styrofoam and also relationship between compressive strength and elastic modulus of concrete by percentage increased granular styrofoam. Granular styrofoam is used by consideration it can reduce the weight of concrete but still has enough strength to arrest loads. The comparison of mixture is 1 : 2 : 3 (cement : sand : crush stone) by comparison of weight with water cement ratio is 0,50 and maximum size of aggregates are 25 mm. Variation of percentage increased granular styrofoam are 0%, 10%, 20%, 30%, 40% to volume of mixture. The range of diameter granular styrofoam are 3-10 mm, with volume of weight 22,89 kg/m3. The specimen for compression and elastic modulus test in cylindrical form by size 150 mm of diameter and 300 mm of height with amount 7 specimens for each percentage increased granular styrofoam where 5 specimens are read the change of length to get modulus of elasticity. The tests are done when specimens age 28 days. Experiment results show that compressive strength and elastic modulus decrease with increased percentage granular styrofoam which add to concrete mixture. The value of compressive strength by adding granular styrofoam 0%, 10%, 20%, 30%, 40% are 32,395 MPa, 24,144 MPa, 17,994 MPa, 13,411 MPa, 9,995 MPa. Decreased of elastic modulus by adding granular styrofoam 10%, 20%, 30%, 40% based on ASTM C 469 are 0,278%, 5,797%, 16,555%, and 32,553%, and based on slope of the stress-strain curve are 0,587%, 6,256%, 17,006%, and 32,838%.
HUBUNGAN ANTARA KARAKTERISTIK BETON MENGGUNAKAN AGREGAT KASAR LIGHTWEIGHT EXPANDED CLAY AGGREGATE (LECA) Sudarsana, I Ketut; Astawa Diputra, I Gede; Ari Astuti, Ni Made Dwi
JURNAL SPEKTRAN Vol 6 No 1 (2018): Vol. 6, No. 1, Januari 2018
Publisher : Program Study of Master of Civil Engineering, Faculty of Engineering, Udayana University

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Lightweight concrete is a concrete made of lightweight aggregates and has a volume weight ranging from 1140-1840 kg/m3. This research was conducted to find out the correlation between concrete characteristics using LECA coarse aggregate that proportioned for lightweight concrete mixture according to SNI 03-3449-2002 standard with target compressive strength of 20 MPa, 25 MPa, and 30 MPa. The studied characteristics of the LECA concrete include the value of slump, volume weight, compressive strength, tensile strength, and modulus of elasticity. Each mix proportion was made 8 cylinder specimens of ASTM standard, so there were 24 test specimens for the three studied mixtures. The proportion of concrete mixture obtained for the target strength of 20 MPa is 1: 1.16: 2.46 with the value of cement water ratio (w/c) of 0.6, for the concrete strength of 25 MPa is 1: 0.91: 1.99 with the w/c of 0.52, and for the quality of the strength of 30 MPa is 1: 0.65: 0.94 with the w/c of 0.4. The test results obtained the mixed slump value of 155 mm, 145 mm, and 120 mm for the target concrete strength of 20 MPa, 25 MPa, and 30 MPa, respectively. The volume-weight value of LECA concrete ranges from 1564-1692 kg/m3 so that it is categorized as a lightweight concrete. The concrete compressive strength is 22 to 42% of the target concrete strength, and is categorized as a non-structural concrete. The split test tensile strength is 12 - 18% of its compressive strength. Increasing the value of LECA concrete compressive strength can also increase in its tensile strength and modulus of elasticity.   Keywords: lightweight concrete, LECA aggregate, concrete characteristics, compressive strength, tensile strength.
ANALISIS PERILAKU HUBUNGAN PELAT-KOLOM TEPI STRUKTUR PELAT DATAR MENGGUNAKAN CONCRETE DAMAGE PLASTICITY (CDP) DALAM ABAQUS Sudarsana, I Ketut; Gegiranang Wiryadi, I Gede; Adi Susila, I Gede
JURNAL SPEKTRAN Vol 5 No 2 (2017): Vol. 5, No. 2, Juli 2017
Publisher : Program Study of Master of Civil Engineering, Faculty of Engineering, Udayana University

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This research was done to investigate the behavior of edge slab-column connection of flat plate structure using the CDP features of ABAQUS software. Experimental specimen obtained in the literature was modelled in ABAQUS software with CDP features to define the concrete inelastic behavior. The investigated slab-column connection is an edge slab-column subassembled connection having slab dimension of 1020 mm x 1540mm, slab thickness of 120 mm, column dimension of 250 mm x 250mm and column height of 1520 mm. The vertical load and unbalanced moment were applied through the column ends. The vertical load works in the direction perpendicular to slab surface, and the unbalanced moment perpendicular to slab free edge that is obtained from a couple of horizontal forces acting in opposite direction. As many as 22 models were analyzed for five variations on CDP parameters and mesh size. The parametric values of the CDP were varied to obtained the analysis results predict well the experimental results. The analysis shows that the parametric values of CDP such as viscosity (µ) of 0,00005, dilatation angle (?) of 40°, using tension strain to define tension behavior of concrete, and considering damage parameter due to compression and tension give the analysis results of the behavior of edge slab-column connections close to experimental result.  Key words: edge slab-column connections, unbalanced moment, punching shear, abaqus, concrete damage plasticity
KUAT LEKAT TULANGAN BAMBU PETUNG DAN BAMBU TALI DALAM BETON NORMAL Sudarsana, I Ketut; Putra, Dharma; Puryandhari, I Gusti Ayu Putu Wegie
Jurnal Ilmiah Teknik Sipil Jurnal Ilmiah Teknik Sipil, Vol. 24, No. 1, Januari 2020
Publisher : Department of Civil Engineering, Udayana University

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This research was conducted to obtain the bond strength between the varnished bamboo in concrete with the variation in embedded length of reinforcement in the concrete and the type of bamboo. The bamboo used is Petung bamboo from Sidemen Village, Karangasem and Tali bamboo from Manggisari Village, Negara. The specimens were made in the form of bamboo Petung and Tali reinforcement with dimensions of width 15 mm and thickness of 5 mm embedded into a concrete cube of 150 mm x 150 mm x 150 mm with a compressive strength of 20 MPa. Reinforcement planted at the center of the cube as deep as 100 mm and 75 mm. Pull out test was carried out with a Universal Testing Machine (UTM). To find out the tensile strength of bamboo, tensile tests were carried out on bamboo reinforcement with and without nodes having dimensions of 5 mm width and 5 mm thick for Petung bamboo, and 5 mm width and 3 mm thick for Tali bamboo. The results of tensile strength of Petung bamboo with and without nodes were 155.14 MPa and 268.08 MPa respectively. Whereas the tensile strength of Tali bamboo with and without nodes was 138.42 MPa and 182.13 MPa respectively. The results of bond test show that the average value of bond stress of the Petung bamboo with the embedded length of 100 mm with and without nodes was 1.44 MPa and 1.34 MPa, espectively, while the embedded length of 75 mm with and without nodes was 2.61 MPa and 1.74 Mpa, respectively. The Average bond stress of the Tali bamboo with the emebedded length of 100 mm with nodia was 1.07 MPa and without nodia was 0.91 MPa, while the embedded length of 75 mm with nodia was 1.39 MPa and without nodia was 0.94 MPa.
PENGARUH KARAKTER INDIVIDU DAN PERSEPSI KEADILAN PADA KINERJA KARYAWAN (STUDI KASUS PADA HOTEL DI KOTA DENPASAR) Sudarsana, I Ketut
Jurnal Ilmiah Hospitality Management Vol 7 No 2 (2017)
Publisher : STPBI PRESS, Sekolah Tinggi Pariwisata Bali Internasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (249.288 KB) | DOI: 10.22334/jihm.v7i2.6

Abstract

Improving the quality of human resources can be done through the utilization of various functions and personnel activities to ensure that they will be absorbed in the world of hospitality. Employee performance is influenced by various factors including individual characters and their perception of fairness in working. The purpose of this research is to examine the influence of individual characters and perceptions of fairness on employee performance as well as to identify the state of individual characters and the perception of fairness to employee performance at the hotel in Denpasar. The results showed that individual character, and perception of fairness simultaneously have a significant effect on the performance of Hotel employees in Denpasar. Furthermore, partially individual characters, and the perception of fairness affect the performance of hotel employees in Denpasar. Because the perception of fairness has a dominant effect on employee performance, the management is expected to give sufficient attention to the amount of rewards received by the employee so that they are always motivated in doing every job that has become their duty. Giving authority in decisions, responses and good attention from superiors and the existence of a system of fair division of tasks should be maintained by the management in order to maintain the company performance.
EFEK PENAMBAHAN DINDING GESER ATAU PERIMETER BEAMS TERHADAP PERILAKU DINAMIS STRUKTUR PELAT DATAR EMPAT TINGKAT Sudarsana, I Ketut; Giri, Ida Bagus Dharma; Wiryadi, I Gede Gegiranang
Jurnal Ilmiah Teknik Sipil Jurnal Ilmiah Teknik Sipil, Vol. 18, No. 1, Januari 2014
Publisher : Department of Civil Engineering, Udayana University

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Flat plate structural system is a plate structural system that supported directly by columns without column heads or drop panels. The advantages of this system are distance between the floors can be shortened, faster construction, ease of architectural work and installation of Mechanical, Electrical and Plumbing Equipment (MEP). However, this system has a weakness on the join (connection of slab-column) that is too flexible and susceptible to punching shear failure especially when the existence of moment due to earthquake. This study investigates the changes on dynamic behaviors of flat plate structures when it is added lateral stiffeners such as shear walls or perimeter beams in terms of its natural period, base shear force, floor displacement, and a change on the forces of the structural elements. The structure of the building being simulated is regular structure consisting of 4 floors with 3 meter floor to floor space and 4 spans along X axis direction (Lx = 6 m) and 3 spans along Y axis direction (Ly = 5 m). The building is a hotel, which stands on medium soil in Bali Provice. Flat plate structures with additional of shear walls or perimeter beam are designed in accordance with the requirements of SNI 03-2847-2002. Analyses were performed in three dimensions (3D) using commercial software SAP2000 v15, where the three structure models have the same property namelyplate thickness, column dimensions, mass and material properties. Dynamic behaviorsare studied based on time history analysis (integration time step) according to the average acceleration method from Newmark with acceleration record of the El-Centro earthquake 1940. Analysis shows that addition of shear walls or perimeter beam causes the natural period of structure and horizontal displacement decrease, while the base shear force and structural rigidity increase. Moments, shear forces on columns and shear forces on the plate around the column decrease with the addition of shear walls. The addition of perimeter beam increases the moments and shear forces on first floor columns and shear forces on the plate around the column decrease dramatically on the edge columns