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Civil Engineering Dimension
ISSN : 14109530     EISSN : 1979570X     DOI : -
Core Subject : Engineering,
The Civil Engineering Dimension (Dimensi Teknik Sipil) is a refereed journal, published twice a year, in March and September.
Arjuna Subject : -
Articles 8 Documents
Search results for , issue "Vol. 5 No. 1 (2003): MARCH 2003" : 8 Documents clear
EVALUASI PENURUNAN TANAH LIAT DENGAN METODE SUB-LAYER Gogot Setyo Budi; Hery Susanto; Sugeng Raharjo Condro
Civil Engineering Dimension Vol. 5 No. 1 (2003): MARCH 2003
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (364.133 KB) | DOI: 10.9744/ced.5.1.pp. 14-19

Abstract

Consolidation settlement is commonly computed using one-point method, where a clay deposit is assumed as one layer and the stress increase from foundation is taken at the middle of the layer. This method is not accurate for determining consolidation settlement of a thick clay deposit. This paper presents sub-layer method to compute consolidation settlement, which assumes that a clay layer is composed of several thinner layers. The results of both methods were compared to the settlement observed from the three experiments using a model of square footing with dimension of 10 cm by 10 cm, which was laid on a layer of clay. The thickness of the clay layer were 24 cm, 39 cm, and 50 cm or 2.4 B, 3.9 B, 5 B, respectively, where B is the width of the foundation. The result shows that the consolidation settlement calculated using sub-layer method is always greater than that computed using the one-point method and it has a better agreement to the settlement of the models. Minimum number of layers that gives sufficient accuracy of settlement is 10. Abstract in Bahasa Indonesia : Penurunan akibat konsolidasi pada umumnya dihitung dengan memakai metode one-point, dimana lapisan tanah liat dianggap satu lapisan, dan penambahan tegangan akibat beban dari pondasi hanya ditinjau pada tengah-tengah lapisan. Cara ini kurang teliti terutama untuk menghitung penurunan lapisan tanah liat yang tebal. Makalah ini mengemukakan metode sub-layer untuk menghitung penurunan akibat konsolidasi. Metode ini mengasumsikan bahwa suatu lapisan tanah liat terdiri dari beberapa lapisan tipis (sub-layer) dan perhitungan penurunannya dilakukan pada setiap lapisan tersebut. Hasil perhitungan dari kedua metode dibandingkan dengan penurunan yang diperoleh dari tiga percobaan pada model pondasi dengan ukuran panjang 10 cm dan lebar 10 cm, yang diletakkan di atas lapisan tanah liat. Ketebalan lapisan tanah yang dipakai adalah 24 cm, 39 cm, dan 50 cm, atau masing masing sebesar 2.4 B, 3.9 B, dan 5 B, dimana B adalah lebar pondasi. Hasil penelitian menunjukkan bahwa penurunan yang dihitung dengan metode sub-layer selalu lebih besar dari penurunan yang dihitung dengan metode one-point, dan lebih mendekati penurunan hasil percobaan. Jumlah layer minimal untuk mendapatkan penurunan yang cukup akurat adalah 10 lapisan.
PENGARUH FLY ASH TERHADAP SIFAT PENGEMBANGAN TANAH EKSPANSIF Gogot Setyo Budi; Andy Cristanto; Eddy Setiawan
Civil Engineering Dimension Vol. 5 No. 1 (2003): MARCH 2003
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (139.855 KB) | DOI: 10.9744/ced.5.1.pp. 20-24

Abstract

Swell and shrink behavior of expansive clays raise significant problem in the field of civil engineering. This paper presents the laboratory experiment of expansive soil stabilization using fly ash (FA). The amount of fly ash used in this experiment ranges from 10% to 25% of dry weight of soil. The results show that the addition of fly ash reduces the specific gravity (Gs), increases the plasticity index (PI), increases the dry density, decreases swelling potentials, and increases strength of soil. This experiment also shows that the increase of strength and the decrease of swelling potential were influenced by the curing time. Abstract in Bahasa Indonesia : Sifat kembang susut tanah expansif merupakan salah satu kendala yang cukup rumit dalam rekayasa bidang teknik sipil. Makalah ini mempresentasikan penelitian laboratorium tentang stabilisasi tanah expansif dengan menggunakan fly ash (FA). Kandungan fly ash yang ditambahkan bervariasi antara 10% sampai 25% dari berat kering tanah. Hasil penelitian menunjukkan bahwa penambahan fly ash ke dalam tanah dapat menurunkan specific gravity (Gs), meningkatkan indeks plastisitas (PI), meningkatkan berat volume kering (dry density), menurunkan potensi pengembangan (swelling potential), dan menaikkan kekuatan tanah. Sedangkan pengaruh curing menunjukkan bahwa, lamanya curing dapat menurunkan potensi pengembangan dan meningkatkan kekuatan. Kata kunci: tanah expansif, stabilisasi tanah, fly ash.
TESTING HARDENED CONCRETE USING THE MATURITY CONCEPT George Ilinoiu
Civil Engineering Dimension Vol. 5 No. 1 (2003): MARCH 2003
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (174.356 KB) | DOI: 10.9744/ced.5.1.pp. 25-28

Abstract

The paper provides an overview of different methods that can be used for concrete maturity determination, outlining Romanian Concrete Code Specification (NE 012-99) in relation to using an effective and rational method in evaluating in-situ concrete strength at different ages.
PENGARUH RANGKAK CREEP PADA BANGUNAN TINGGI Benjamin Lumantarna; Steven Steven; David Budiono
Civil Engineering Dimension Vol. 5 No. 1 (2003): MARCH 2003
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (675.775 KB) | DOI: 10.9744/ced.5.1.pp. 29-38

Abstract

Inelastic deformation due to creep can cause dramatic change of end moment of beams. In this study the influence of creep to end moments is compared with the ones calculated using direct and sequential load methods. An approximate method using Equivalent Modulus of Elasticity is proposed. Four shear wall frame buildings, 10, 20, 30, and 40 stories with 30 cm shear wall are subjected to 5, 10, 15, and 20 years creep. It is shown that the difference between the 5, 10, 15, and 20 years creep are not significant. Compared to the sequential method, the direct method gives a better result to the creep. It is also shown that except for the 10 story building, the end moments caused by the development of creep deformation can cause cracks, thus the ability of the beams to redistribute the end moment must be assured. Abstract in Bahasa Indonesia : Perubahan bentuk inelastis yang disebabkan oleh rangkak (creep) dapat menyebabkan perubahan momen pada tumpuan balok. Penelitian ini mempelajari pengaruh rangkak dan membandingkan hasil perhitungan yang diperoleh terhadap metode pembebanan langsung dan pembebanan sequential. Untuk memperhitungkan pengaruh rangkak, diusulkan suatu metode penyederhanaan di mana digunakan konsep Modulus Elastisitas Ekivalen. Dalam penelitian ini ditinjau 4 buah bangunan, yaitu bangunan 10, 20, 30 dan 40 lantai dengan dinding geser tebal 30 cm., pengaruh rangkak diperhatikan pada saat bangunan berumur 5, 10, 15, dan 20 tahun. Hasil penelitian menunjukkan bahwa tidak ada perbedaan yang berarti antara rangkak 5, 10, 15, dan 20 tahun. Dibandingkan dengan metode sequential, metode pembebanan langsung lebih mendekati hasil yang diberikan perhitungan dengan memasukkan pengaruh rangkak. Juga ditunjukkan bahwa selain pada bangunan 10 lantai, akibat rangkak akan terjadi retak pada beberapa tumpuan, sehingga dalam perencanaan harus dimungkinkan terjadinya redistribusi momen dari tumpuan ke lapangan.
DESIGN COORDINATION IN DISTRIBUTED ENVIRONMENTS USING VIRTUAL REALITY SYSTEMS Rusdi HA
Civil Engineering Dimension Vol. 5 No. 1 (2003): MARCH 2003
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (123.839 KB) | DOI: 10.9744/ced.5.1.pp. 1-6

Abstract

This paper presents a research project, which investigates the use of virtual reality and computer communication technology to facilitate building design coordination in distributed environments. The emphasis of the system, called VR-based DEsign COordination (VRDECO) is providing a communication tool that can be used by remote designers for settling ideas before they fully engage in concurrent engineering environments. VRDECO provides the necessary design tools, library of building elements and communication procedures, for designers from remote places to perform and coordinate their initial tasks. It has been implemented using available commercial software packages, and is used in designing a simple house. VRDECO facilitates the creation a preliminary design and simple communication with the client. There are, however, some difficulties in the development of the full version of VRDECO, i.e.: creating an adequate number of building elements, building specification database with a sufficient number of choices, and establishing a systematic rule to determine the parts of a building that are updateable.
APLIKASI BAMBU PILINAN SEBAGAI TULANGAN BALOK BETON Jauhar Fajrin Pathurahman; Dwi Anggraini Kusuma
Civil Engineering Dimension Vol. 5 No. 1 (2003): MARCH 2003
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (442.259 KB) | DOI: 10.9744/ced.5.1.pp. 39-44

Abstract

Reinforcing steel is a nonrenewable mining product. In order to solve this problem, bamboo, which is cheap and has a fairly high tensile strength, could be used as an alternative. In this study, bamboo is used to reinforce concrete beam. The beams are designed under reinforced with no compression reinforcement. All beams are reinforced with 12 mm bamboo Galah protected with water resistant layer. A four-point load test set up is used to ensure pure bending. The test results show that the average value of first crack moment is 15.26 % bigger compared with the calculated moment. This indicates that there is a reasonable agreement between experimental and theoretical results. The standard deviation (35,31 %) indicates that the quality of bamboo used in this study is not uniform. It could be concluded that, there is a possibility to use bamboo to replace steel as reinforcement, particularly for simple concrete structures. Abstract in Bahasa Indonesia : Baja tulangan adalah produk hasil tambang yang keberadaannya suatu saat akan habis. Untuk mengatasi problem tersebut, sebagai alternatif dicoba pemakaian tulangan bambu yang murah dan berkekuatan tinggi. Pada penelitian ini bambu digunakan sebagai tulangan balok beton, balok direncanakan bertulangan liat (underreinforced) dan tidak bertulangan tekan, semua balok diberi tulangan bambu pilinan dari bamu galah dengan diameter 12 mm dan diberi lapisan kedap air. Pengujian dilakukan dengan menggunakan metode four point load, sehingga pada bagian balok diharapkan akan terjadi lentur murni. Hasil penelitian menunjukkan bahwa nilai rata-rata perbandingan antara momen retak awal (eksperimen) dengan momen perhitungan (teoritis) sebesar 115.26 %, hal ini menunjukkan adanya kecocokan antara teori dan ekperimen. Simpangan standar yang cukup besar yaitu 35.31 % dapat diartikan bahwa kualitas tulangan kurang seragam. Disimpulkan bahwa bambu memiliki peluang untuk digunakan sebagai tulangan, khususnya untuk struktur beton sederhana
PERHITUNGAN KAPASITAS PENAMPANG KOLOM BETON MUTU TINGGI YANG TERKEKANG DENGAN BLOK TEGANGAN SEGIEMPAT EKIVALEN Darmansyah Tjitradi; Syahril Taufik; Bengawan L. Kosasih
Civil Engineering Dimension Vol. 5 No. 1 (2003): MARCH 2003
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (310.017 KB) | DOI: 10.9744/ced.5.1.pp. 45-50

Abstract

Abstract in Bahasa Indonesia : Beton mutu tinggi merupakan sesuatu yang saat ini masih asing dalam pelaksanaan, konstruksi di Indonesia, tetapi dengan kemajuan teknologi yang memudahkan pembuatannya, dapat diharapkan pemakaiannya dalam waktu mendatang. Artikel ini membahas transformasi diagram tegangan-regangan beton mutu tinggi menjadi segi empat ekivalen seperti biasa digunakan untuk beton mutu biasa.
ON REPRESENTING FACTORS INFLUENCING TIME PERFORMANCE OF SHOP-HOUSE CONSTRUCTIONS IN SURABAYA Andi Andi; Susandi Susandi; Hendra Wijaya
Civil Engineering Dimension Vol. 5 No. 1 (2003): MARCH 2003
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (179.035 KB) | DOI: 10.9744/ced.5.1.pp. 7-13

Abstract

Some shop-houses were built late and others are on time, or faster than the schedule that had been planned. The questions are how it could happen and what kind of factors that made it happened. This research has an objective to investigate time performance of shop-house constructions in Surabaya by representing factors that influence it. It first assembles potential influencing factors through literature review, and second, conducts an empirical study by collecting data from finished thirty-two shop-house projects throughout the city. Results of analyses using one-way analysis of variance (ANOVA) indicate eight factors to be statistically significant influencing time performance. They are construction design change, schedule of work that will be done, workers discipline, material availability, owner’s payment, quality control, workers availability, and material delivery. The paper discusses the factors and proposes possible solutions to improve time performance.

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