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Perilaku Nonlinier Buckling pada Struktur Cangkang Bola Sumirin, Sumirin; nuroji, nuroji
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 20, Nomor 2, DESEMBER 2014
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (794.769 KB) | DOI: 10.14710/mkts.v20i2.9252

Abstract

This paper presents the results of a numerical study using the finite element method in geometrical nonlinear on camped shallow spherical shells under uniform pressure. The shell structure was modelled by finite axisymmetric thin shell elements and quadrilateral elements. The geometrical nonlininear problem was solved by a scheme of incremental iterative procedures applying Newton-Raphson method in combination with arch length methods. The results of finite element analysis compared with the experimental results of previous reseacher.
Kajian Kekuatan dan Daktilitas Kolom Bertulang Sumirin, Sumirin
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 14, Nomor 1, Edisi XXXIV, PEBRUARI 2006
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (325.299 KB) | DOI: 10.14710/mkts.v14i1.3935

Abstract

This paper present strength analysis and of ductility of normal concrete column and high quality concrete which confined by lateral reinforcement by comparing made by model’s from Meander-Priestley, Kent-Park, Antonius-Munaf and also Legeron-Paultre. Reinforced Concrete Column with variation of strength  concrete and stirrup analysed to use computer program which is its result can be presented visual graphic. Result of analysis indicate that stiffness  of concrete confined by among model of Mander-Priestley, Kent-Park, Antonius-Munaf and of Legeron-Paultre its result vary one another if strength concrete fc’ progressively mount. Curve before respon culminate at curve of Moment-Curvature tend differing  one another improved of strength concrete fc'. All of model happened degradation of Capacity of Moment at spacing stirrup decrease. In general ductility typicaly not far differ between model of Mander-Priestley, Kent-Park, Antonius-Munaf and of Legeron-Paultre. From is fourth of the model concluded that estimation of ductility and strength moment is tending to highest. Keywords: column, momen-curvature, konfinement model Permalink: http://www.ejournal.undip.ac.id/index.php/mkts/article/view/3935[How to cite: Sumirin, 2006, Kajian  Kekuatan dan Daktilitas Kolom  Bertulang, Jurnal Media Komunikasi Teknik Sipil, Volume 14, Nomor 1, pp. 63-72]
Perilaku Beban-Perpindahan Aksial Pre-Buckling dan Post-Buckling pada Struktur Kolom Elastis Sumirin, Sumirin
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 20, Nomor 1, JULI 2014
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (800.597 KB) | DOI: 10.14710/mkts.v20i1.9246

Abstract

The analysis of column buckling is generally based on the analysis of linear eigenvalue problem to obtain the buckling load. In the linear analysis we do not know the load-displacement behavior especially after buckling occurs. This research studied the behavior of the elastic column on the stage pre-buckling and post-buckling by finite gemetrically nonlinear of finite element method. Difficulties in equilibrium problem at around the point of buckling load solved by using the Newton-Raphson incremental method with constant arc- length technique. To generate the initial touch of buckling columns are very small lateral load or by providing the initial lateral deformation is very small. Axial load-displacement curve column finite element analysis results compared to the results of previous reseacher. An axial load-displacement curve bilinear proposed in this study.
Analisis Efektivitas Model Perkuatan dengan Injeksi Semen untuk Peningkatan Angka Keamanan Lereng Sumirin, Sumirin; Arief, Rifqi Brilyanto
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 23, Nomor 1, JULI 2017
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (767.796 KB) | DOI: 10.14710/mkts.v23i1.14738

Abstract

The problem of slope stability can be overcome by grouting of cement paste. But, the question often arises as to the extent of grouting of cement paste can increase the factor of safety. This study aims to determine the effectiveness of the effect of grouting on increasing safety factor on the slope of embankment. Experiments have been conducted in the laboratory using 6 types of mixed samples of sand and coarse aggregate. Field testing was conducted on 1 model to determine the effectiveness of grouting. The results of the experiments show that the injection of cement paste in this study proved to be effective in strengthening the embankment with the content of coarse aggregate 60%. The increase factor of safety (FS) using grouting is from FS= 1.9 (33.3%) to FS = 2.80 (90.0%). Factors determining the effectiveness of injection are: (a) injection method with drilling technique before injection to form cement column; (b) the optimum of water-cement ratio w/c = 1.5; (c) the ratio of spacing and injection diameter Lg / Dg = 8, the depth of injection 0.75 from the height of the embankment.
EXPERIMENTAL STUDY OF LIGHTWEIGHT CONCRETE MECHANICAL QUANTITY WITH HEATED STYROFOAM MATERIAL Lukman, Wiwik; Sumirin, Sumirin; Antonius, Antonius
Journal of Industrial Engineering & Management Research Vol. 2 No. 6 (2021): December 2021
Publisher : AGUSPATI Research Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (424.477 KB) | DOI: 10.7777/jiemar.v2i6.245

Abstract

Research on lightweight concrete based on styrofoam aggregates has been carried out previously, namely by providing heat treatment to styrofoam before being used as a substitute for aggregate with fine grains. The Styrofoam used is Expanded Polystyrene (EPS) with a grain size of 5 – 8 mm before being heated. Styrofoam seeds were heated at a temperature of 1380 C for 7 minutes. The variation of the test object in this study was using styrofoam as a substitute for 100% coarse aggregate and 75% coarse aggregate replacement so that the remaining 25% coarse aggregate used gravel with sizes of 10x10 mm and 10x20 mm. To close the pores of the concrete in this variation of the test object, 30 % of the weight of the aggregate was also added with fly ash. To improve the workability, a superplasticizer of 0.6% of the cement weight was used.The tests carried out are compressive strength, split tensile strength and flexural strength. The results obtained were the optimum value of the compressive strength test of 19.57 MPa on lightweight concrete with heavy coarse aggregate replaced by 100% heated styrofoam. For the optimum value of the split tensile strength test, it was found that 2.83 MPa in lightweight concrete, the weight of coarse aggregate was replaced by 75% styrofoam and 25% gravel with a size of 10x20 mm. For the optimum value of the flexural strength test, it was obtained at 3.27 MPa in lightweight concrete, the weight of coarse aggregate was replaced by 75% styrofoam and 25% gravel with a size of 10x10 mm.
STUDI METODE PERKUATAN LERENG MENGGUNAKAN GEOMAT, SHOTCRETE, DAN SOIL NAILING (Studi Kasus: Lereng Spillway Bendungan Sadarwana Paket II Subang) Putra, Sahal Priyono; Rochim, Abdul; Sumirin, Sumirin
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol 28, No 1 (2023): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v28i1.4562

Abstract

The landslide of the upper slope in the excavation work of the spillway SadawarnaDam Package II Subang occurred after rain, precisely at the STA location from0+500 to 0+520. The purpose of the study was to compare soil reinforcement on theprevious spillway slope using geomat and shotcrete with soil reinforcement usingsoil nailing. Based on soil data the spillway slope consists of two types of slopes, theupper slope consists of CL (BS:03) while the lower consists of ML (BS:04). Theshear strength parameters C and Phi of both slope soils are quite high. Using PlaxisV.21, Slope/W and Seep/W, with C and Phi the slopes were found to be stable.However, in reality there was a landslide on the upper slope. Therefore, backanalysis was performed by lowering the strength parameters of the top soil adjacentto the slope until the landslide was realized. The reinforcement used on the twoslopes was different, the upper slope used geomat while the lower slope usedshotcrete, then the geomat was changed to soil nailing. Two seasonal models wereapplied to all reinforcements. The results showed that the factor of safety valuesfrom the back analysis modeling in the wet season using geomat and shotcrete wereless than 1 (Unstable). However, reinforcement using soil nailing has a SafetyFactor higher than 1.5. Based on these results, soil nailing can be a solution tominimize landslides on the spillway slope.
ANALISA APLIKASI BETON RINGAN PADA SALURAN U-DITCH Zulfikar, Muhammad Agsa; Sumirin, Sumirin; Karlinasari, Rinda
Pondasi Vol 28, No 1 (2023): Juni 2023
Publisher : UNISSULA Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/pondasi.v28i1.29774

Abstract

Bahan beton di Indonesia, bahkan di seluruh dunia selalu mengalami perkembangan pada tahun ke tahun. U-Ditch beton bertulang adalah suatu bentuk inovasi dari beton pra-cetak yang diperuntukan sebagai saluran, drainase maupun saluran irigasi. Beton ringan yang hanya digunakan untuk beton non-struktural sekarang mulai berkembang dan banyak dilakukan penelitian untuk beton mutu tinggi dengan berat yang ringan sehingga mengurangin berat stuktur itu sendiri. Berdasarkan permasalahan diatas, maka perlu dikembangkan suatu produk U-ditch pra-cetak dengan kualitas mutu yang tinggi namun memiliki berat yang ringan sehingga mudah untuk diangkat.Dengan mengunaka metode perhitungan campuran beton ringan SNI 03-3449-2002 tentang “Tata Cara Rencana Pembuatan Campuran Beton Ringan Dengan Agregat Ringan”. Hasil dari perhitungan tersebut di dapatkan berat isi beton sebesar 1753,89 kg/m3 lebih ringan 20,35% dari pada beton normal. Pengujian kuat tekan beton ringan sebesar 20,879 MPa atau 251,55 Kg/cm2. Untuk mengetahui u-ditch dapatmengunkan bahan beton ringgan, maka dilakukan pemodelan menggunakan SAP2000 v.14 untuk melihat gaya-gaya pada dinding dan plat lantai u-ditch tersebut. Momen maksimal yang terjadi sebesar 0,9404 kN.m/m dan penulangan didapatkan tulangan lentur D10-150. Pembuatan beton pra-cetak u-ditch dengan ukuran 40 X 40 X 100 X 6, dengan tulangan lentur D10-150 seperti pada produksi yang biasa dilakukan oleh PT. Agung Beton. Menghasilkan berat u-ditch 138 kg sehinggan dapat di angkat oleh 2 orang. Pengujian permeabilitas terjadi penurunan sebesar 3,65% lebih rendah dari SNI yang syarat maksimum 6,5%.
KAJIAN PEMBANGUNAN DAN PEMBIAYAAN PERUMAHAN MURAH (STUDI KASUS MODEL PERUMAHAN BERBASIS PENGEMBANG DAN KOMUNITAS) Umam, Syafi'ul; Wibowo, Kartono; Sumirin, Sumirin
Jurnal Disprotek Vol 15, No 2 (2024)
Publisher : Universitas Islam Nahdlatul Ulama Jepara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34001/jdpt.v15i2.4733

Abstract

Menurut data Kementerian Pekerjaan Umum dan Perumahan Rakyat Tahun 2020, angka backlog kepemilikan (kesenjangan antara rumah terbangun dengan jumlah rumah yang dibutuhkan) mencapai 12,75 juta unit. Salah satu faktor tingginya angka backlog diantaranya adalah adanya segmen Masyarakat Berpenghasilan Rendah (MBR) non fixed income yang tidak sanggup membeli rumah umum tapak meskipun melalui program Kredit Pemilikan Rumah (KPR) bersubsidi. Penelitian ini bertujuan untuk mendapatkan model konstruksi dan material dinding rumah yang efektif dan efisien untuk meminimalkan biaya pembangunan; serta model pembangunan dan pembiayaan perumahan murah. Metode penelitian digunakan analisis kuantitatif dan kualitatif. Analisis kuantitatif berupa perhitungan efektifitas dan efisiensi menggunakan perhitungan biaya dan kurva S, serta estimasi harga jual nyata metode cost based pricing dengan pendekatan cost plus untuk mendapatkan harga jual nyata paling ekonomis. Sementara analisis kualitatif berupa focus group discussion, wawancara mendalam, observasi, telaah dokumen, telaah kebijakan pemerintah dan kebijakan lembaga keuangan lainnya.  Berdasarkan hasil penelitian dapat disimpulkan, 1) model konstruksi RUSPIN material dinding bata ringan lebih efektif yakni 14 hari lebih cepat dibandingkan dengan konstruksi konvensional dinding bata merah. Namun konstruksi dimaksud lebih mahal Rp 7.783.142,05 atau 7,05% dari biaya konstruksi konvensional dinding bata merah. 2) Model pembangunan perumahan murah adalah model perumahan berbasis komunitas dengan konstruksi rumah konvensional dan material dinding bata merah. 3) Skema pembangunan dan pembiayaan rumah secara gradual dengan tiga tahapan konsep rumah inti tumbuh menghasilkan skema pembiayaan rumah murah, yaitu lebih murah sebesar 37.501.616,25 atau 11,19% dari akumulatif angsuran yang dibayarkan melalui KPR secara sekaligus.STUDY OF CHEAP HOUSING DEVELOPMENT AND FINANCE (CASE STUDY OF DEVELOPER AND COMMUNITY-BASEDAccording to data from the Ministry of Public Works and Public Housing for 2020, the backlog of ownership (the gap between the houses built and the number of houses needed) reached 12.75 million units. One of the factors behind the high backlog number is the non-fixed income segment of the Low-Income Community (MBR) who are unable to buy landed public houses, even through the subsidized housing loan (KPR) program. This study aims to obtain an effective and efficient model of construction and wall materials to minimize construction costs; as well as low-cost housing development and financing models. The research method used quantitative and qualitative analysis. Quantitative analysis in the form of calculating effectiveness and efficiency using cost calculations and the S curve, as well as estimating the real selling price using the cost based pricing method using the cost plus approach to get the most economical real selling price. While qualitative analysis took the form of focus group discussions, in-depth interviews, observations, document reviews, reviews of government policies and policies of other financial institutions. Based on the results of the study it can be concluded, 1) the RUSPIN construction model with lightweight brick wall material is more effective, which is 14 days faster than conventional red brick wall construction. However, the said construction is Rp. 7,783,142.05 or 7.05% more expensive than the cost of conventional red brick wall construction. 2) The low-cost housing development model is a community-based housing model with conventional house construction and red brick wall materials. 3) The gradual housing development and financing scheme with three stages of the growing core house concept results in a low-cost housing financing scheme, which is 37,501,616.25 or 11.19% cheaper than the accumulated installments paid through KPR all at once.
APLIKASI VALUE ENGINEERING PADA PEKERJAAN TAMBAH KURANG UNTUK MENINGKATKAN EFISIENSI BIAYA KONTRAKTOR (Studi Kasus: Gedung D BPOM Jakarta) Hidayat, Indra; Wibowo, Kartono; Sumirin, Sumirin
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol 29, No 2 (2024): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v29i2.6155

Abstract

Cost planning is one of the important things in a development project, both for theproject owner and the implementing contractor. The contractor has a planned costtarget at the tender stage, however, changes in costs may occur during theimplementation period due to additional or less work and resulting in changes incosts. To be able to achieve the cost efficiency target, this can be done by carryingout value engineering. The stages of the value engineering method consist of theinformation stage, function analysis stage, creativity stage, evaluation stage,development stage and recommendation stage. The application of value engineeringin the BPOM Building D Construction Project can provide an increase cost and stillmaintain function. Contractor get cost efficiency of IDR 1,528,657,929,- or 2.52%,while the project owner gets a cost efficiency of IDR 1,182,279,319 or 1.66%.
Design of Low Alkali Activator Geopolymer Concrete Mixtures Setia Romadhon, Eri; Antonius, Antonius; Sumirin, Sumirin
ASTONJADRO Vol. 11 No. 3 (2022): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v11i3.7484

Abstract

This paper presents the results of research on the design of geopolymer concrete mixes. The main objective of this research is to develop an efficient and easy design of low-alkaline activator geopolymer concrete mixture, which until now has been the biggest obstacle in the use of geopolymer concrete. The variables reviewed were the amount of alkaline activator was quite low at 4%, room temperature and 60oC ratio of alkaline activator/fly ash (AAS/FA) were 0.35, 0.4, 0.5, 0.6. The test results show the parameters of geopolymer concrete with low alkali activator 4%, sodium silicate/sodium hydroxide ratio 2.5%, sodium hydroxide molarity 14M, type F fly ash and the discovery of the relationship model of compressive strength and the ratio of alkali activator/fly ash with a very high correlation as basic development of geopolymer concrete mix design. The design of the geopolymer concrete mix developed is easy because it is application-based and efficient because it only requires 4% alkaline activator.