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Journal : Jurnal Spektran

ANALISIS PERILAKU HUBUNGAN PELAT-KOLOM TEPI STRUKTUR PELAT DATAR MENGGUNAKAN CONCRETE DAMAGE PLASTICITY (CDP) DALAM ABAQUS I Ketut Sudarsana; I Gede Gegiranang Wiryadi; I Gede Adi Susila
JURNAL SPEKTRAN Vol 5 No 2 (2017): Vol. 5, No. 2, Juli 2017
Publisher : Master of Civil Engineering Program Study, Faculty of Engineering, Udayana University

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Abstract

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
STUDI PERBANDINGAN PERILAKU DAN KINERJA STRUKTUR BAJA MENGGUNAKAN KOLOM KOMPOSIT CONCRETE ENCASED DAN CONCRETE FILLED TUBE, SERTA NON KOMPOSIT I Ketut Diartama Kubon Tubuh; Made Sukrawa; I Gede Adi Susila
JURNAL SPEKTRAN Vol 5 No 2 (2017): Vol. 5, No. 2, Juli 2017
Publisher : Master of Civil Engineering Program Study, Faculty of Engineering, Udayana University

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Abstract

Comparative study of steel structure behavior and performance using composite and non composite columns were done by making five structure models. A model using wide flange steel columns, two models with circular and square concrete encased columns (MCEC and MCES), also two models with circular and square concrete filled tube columns (MCFTC and MCFTS). Columns on 4th-5th floor are smaller than columns on three floors below. Structure behavior were observed through elastic analysis which are displacement and interstory drift. While structure performance were evaluated through non linear static Pushover analysis using SAP2000®. The analysis showed that with P-M ratio ranging from 0.79 until 0.88, all models interstory drifts were exceed limit on 1st, 2nd and 4th floors. Countermeasures were done by rotating half of total MS steel columns (then became MS-R), enlarging 4th-5th floor columns on MS-R and MCFTC, and also installing eight X-bracings on all models ground floor. Pushover analysis showed that performance level of all models are Immediate Occupancy (IO) except MCFTS. MCFTS model which in Collapse (C) performance level were improved by increasing thickness of steel section (then became MCFTS-Improved) and resulting IO performance level. Calculation of structure materials cost showed the most expensive until the cheapest models respectively were MS-R, MCFTS-Improved, MCEC, MCES, and MCFTC with comparison 1:0,99:0,88:0,87:0,86. Keywords: concrete encased (CE), concrete filled tube (CFT), X-bracing, Pushover analysis
APPRAISAL PROYEK PENGEMBANGAN HOTEL SOL HOUSE DI KABUPATEN BADUNG – BALI I Gede Adi Susila; Anak Agung Gde Agung Yana; I Gusti Agung Ananda Putra
JURNAL SPEKTRAN Vol 8 No 1 (2020): VOL. 8, NO. 1, JANUARI 2020
Publisher : Master of Civil Engineering Program Study, Faculty of Engineering, Udayana University

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Abstract

Appraisal atau Penilaian merupakan proses pekerjaan atau kegiatan seorang appraiser (penilai) dalam memberikan suatu estimasi atau opini atas nilai ekonomis suatu properti, baik berwujud ataupun tidak berwujud. Appraiser memiliki peran penting sebagai penilaian proyek konstruksi terdiri dari tahap studi kelayakan, tahap proses konstruksi dan tahap pasca konstruksi pada Proyek Pengembangan Hotel Sol House di Jalan Bakung Sari No. 81, Badung-Bali. Penelitian ini menunjukkan bahwa hasil appraisal pada proyek konstruksi sebagai berikut: 1) Appraisal dalam tahap studi kelayakan ditinjau dari aspek finansial hasil yang diperoleh yaitu nilai NPV sebesar Rp 13.772.240.994 > 0 (layak), BCR sebesar 1,0602 > 1 (layak), IRR sebesar 15,67% > nilai MARR 13% (Layak) dan PBP selama 8 tahun 11 bulan (layak). Berdasarkan hasil tersebut dapat dikatakan bahwa investasi Pengembangan Hotel Sol House layak untuk mendapatkan pinjaman bank. 2) Appraisal dalam tahap proses konstruksi Pengembangan Hotel Sol House yaitu dengan menggunakan metode earned value. Hasil analisis prestasi fisik sampai dengan periode bulan ke 13 untuk seluruh pekerjaan proyek pembangunan Hotel Sol House telah mencapai prestasi sebesar 79,14% atau setara dengan nilai Rp. 75.718.009.000, nilai CPI sebesar 1,233 > 1 yang berarti kinerja keuangan baik. Sedangkan nilai SPI sebesar 0,80 < 1 sehingga dapat disimpulkan bahwa pelaksanaan proyek lebih lambat dari jadwal awal pembangunan hotel. 3) Appraisal dalam tahap pasca konstruksi Pengembangan Hotel Sol House (diasumsikan telah terealisasi 100%). Hasil analisis menggunakan pendekatan biaya diperoleh nilai pasar properti sebesar Rp. 435.600.000.000 (dengan rincian nilai pasar tanah sebesar Rp. 346.500.000.000 dan nilai pasar bangunan sebesar Rp. 89.100.000.000) terjadinya perkembangan nilai pasar bangunan pada tahap pasca konstruksi dengan tahap studi kelayakan dikarenakan perubahan material, sedangkan hasil analisis menggunakan pendekatan pendapatan diperoleh nilai sebesar Rp. 76.203.168.255.