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Civil Engineering Dimension

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Published by Universitas Kristen Petra Surabaya

ISSN : 14109530 EISSN : 1979570X DOI : -

Core Subject : Engineering,

Civil Engineering, Building, Construction & Architecture

The Civil Engineering Dimension (Dimensi Teknik Sipil) is a refereed journal, published twice a year, in March and September.

Arjuna Subject : -

Articles 453 Documents

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Evaluation Of Finite Element Mesh Arrangements And Stress Intensity Factor Calculation Methods For Opening Mode Fracture Of Cracked-Cemented Materials Pontjo Utomo; Hamid R. Nikraz
Civil Engineering Dimension Vol. 9 No. 1 (2007): MARCH 2007
Publisher : Institute of Research and Community Outreach - Petra Christian University

Fracture mechanics is a branch of mechanics, which deals with the cracked body. Every construction material that currently in use inevitably is not flawless. The pre-existing crack may grow to cause structure failure due to low stress, which acts to a structure. Stress intensity factor (K) is a single parameter in fracture mechanics, which can be used to examine if a crack, would propagate in a cracked structure under particular loading condition. Finite element method is used to analyze the cracked body to provide the displacements data around the crack tip (at quarter point elements) due to load prescribed, for stress intensity factor determination. Two methods of stress intensity factor calculation, Quarter Point Displacement Technique (QPDT) and Displacement Correlation Technique (DCT), were evaluated. A series of standard fracture testing were undertaken to provide the fracture load data (Pf), which coupled with the stress intensity factor analytical formula to calculate fracture toughness. The results showed that under a particular mesh arrangement, the result of finite element analysis could deviate from the analytical formula calculation result. The QPDT method is suitable for compact tension specimen but DCT seemed to be not. For cracked beam analysis, the QPDT and DCT calculations were in good agreement with the analytical formula as long as coupled with the appropriate mesh arrangement around the crack tip.

Prediction of Missing Streamflow Data using Principle of Information Entropy Santosa, B.; Legono, D.; , Suharyanto
Civil Engineering Dimension Vol. 16 No. 1 (2014): MARCH 2014
Publisher : Institute of Research and Community Outreach - Petra Christian University

Incomplete (missing) of streamflow data often occurs. This can be caused by a not continous data recording or poor storage. In this study, missing consecutive streamflow data are predicted using the principle of information entropy. Predictions are performed using the complete monthly streamflow information from the nearby river. Data on average monthly streamflow used as a simulation sample are taken from observation stations Katulampa, Batubeulah, and Genteng, which are the Ciliwung Cisadane river areas upstream. The simulated prediction of missing streamflow data in 2002 and 2003 at Katulampa Station are based on information from Genteng Station, and Batubeulah Station. The mean absolute error (MAE) average obtained was 0,20 and 0,21 in 2002 and the MAE average in 2003 was 0,12 and 0,16. Based on the value of the error and pattern of filled gaps, this method has the potential to be developed further.

The Decline of Soil Infiltration Capacity Due To High Elevation Groundwater Isri Ronald Mangangka
Civil Engineering Dimension Vol. 10 No. 1 (2008): MARCH 2008
Publisher : Institute of Research and Community Outreach - Petra Christian University

Infiltration capacity of soil mainly depends on two factors; the particle size and the moisture content of the soil. Groundwater increases the soil moisture, not only below the water table but also within the capillary zone, above the water table. Field experiment in a high groundwater area was conducted to understand the relationship among the groundwater, soil moisture and infiltration capacity. Using a single ring infiltrometer, the effect of groundwater in the infiltration rate was observed. This field experiment result shows that the groundwater influences significantly the infiltration capacity of the soil, and the infiltration rate follows a specific trendline.

A CASE STUDY ON TOTAL BUILDING PERFORMANCE EVALUATION OF AN INTELLIGENT OFFICE BUILDING IN SINGAPORE Po Seng Kian; Henry Feriadi; Wiliana Sulistio; Kong Chee Seng
Civil Engineering Dimension Vol. 3 No. 1 (2001): MARCH 2001
Publisher : Institute of Research and Community Outreach - Petra Christian University

The importance of understanding the performance of a building in a holistic sense is undeniable. This paper presents a method of total building performance evaluation, which has been widely used in many developed countries including Singapore. An office building with apartment and commercial retails called “intelligent building” is selected for building diagnosis. The occupant surveys and physical walkthroughs are carried out as subjective evaluations, while some objective measurements of indoor air quality and visual quality are also introduced in this study. The results indicate that generally, the occupants are satisfied with the quality of the building despite some insignificant indoor air quality and visual symptoms due to low temperature and glare problem in the office.

Analytical Approach to Predict Pre–Camber Deflection of the Pre-stressed Glulam Beams Buan Anshari
Civil Engineering Dimension Vol. 17 No. 1 (2015): MARCH 2015
Publisher : Institute of Research and Community Outreach - Petra Christian University

A new approach to reinforce glulam timber beams using compressed wood (CW) has been developed by the Author. The compressed wood blocks are inserted into pre-cut holes on the top of glulam beams to produce pre-camber and to generate initial tensile and compressive stresses on the top and on the bottom extreme fiber of the glulam beam, respectively. A simple analytical approach has been developed to predict pre-camber deflections of the beams reinforced with three CW blocks. Assuming that moisture-dependent expansion of the CW block creates an interactive linear pressure between the glulam beam and the CW block, this would generate a pair of eccentric force away from the neutral axis of the beam. It is shown that the pre-camber deflection predicted at midspan of the short beams with various reinforcing arrangements give good agreement with the measured pre-camber from previous experimental results.

Influence of Plastic Waste Fibers on the Strength of Lime-Rice Husk Ash Stabilized Clay Soil A. S. Muntohar
Civil Engineering Dimension Vol. 11 No. 1 (2009): MARCH 2009
Publisher : Institute of Research and Community Outreach - Petra Christian University

A study has been undertaken to investigate the strength of stabilized clay-soil reinforced with randomly distributed discrete plastic waste fibers by carrying out unconfined compressive strength and tensile-split strength test. In this study, the clay soil was stabilized with lime and rice husk ash mixtures. The effect of the fiber length and content on the compressive and split tensile strength was investigated. The laboratory investigation results show that inclusion of the plastic waste fiber increased significantly both the unconfined compressive strength and tensile-split strength of the stabilized clay soil. The fiber length plays a significant contribution in increasing the soil strength. To contribute for any significant improvement on compression as well as tensile strength, the fiber length should be in range of 20 mm to 40 mm. Fiber reinforcements also reduced soil brittleness by providing smaller loss of post-peak strength.

PENELITIAN AWAL PENENTUAN WAKTU PENYELESAIAN PROYEK DENGAN METODE PERT PROJECT EVALUATION AND REVIEW TECHNIQUE Sentosa Limanto; Tirta Djusman Arief
Civil Engineering Dimension Vol. 4 No. 1 (2002): MARCH 2002
Publisher : Institute of Research and Community Outreach - Petra Christian University

Construction involves many activities. Every activity need a portion of time which is defined as duration. Duration is a statistic probabilistic variable, which is expressed in a range of values. So the total time required to complete a construction project is also expressed in a range of times, thus the use of PERT to evaluate construction time is considered to be more realistic. An observation on a construction of a warehouse in steel structure in Surabaya shows that this method gives a tendency of good result. Abstract in Bahasa Indonesia : Pembangunan melibatkan banyak aktivitas. Tiap aktivitas memerlukan sejumlah waktu, yang didefinisikan sebagai durasi. Durasi adalah sebuah besaran statistik probabilistik, yang dinyatakan dalam satu interval nilai. Maka total waktu yang diperlukan untuk menyelesaikan pembangunan juga dinyatakan dalam satu interval waktu, sehingga penetapan waktu penyelesaian proyek dengan metode PERT dirasakan lebih realistis. Pengamatan atas pelaksanaan sebuah gudang yang terbuat dari struktur baja, di Surabaya, menunjukkan bahwa metode ini memberikan kecenderungan hasil yang baik.

Sustainable Concrete Technology Sim Jonsung; Lee K.H.
Civil Engineering Dimension Vol. 17 No. 3 (2015): SPECIAL EDITION
Publisher : Institute of Research and Community Outreach - Petra Christian University

The growing concern over global warming and significant ecological changes requires sustainable development in all fields of science and technology. Concrete not only consumes huge amount of energy and natural sources, but also emits large amount of CO2, mainly due to the production of cement. It is evident that such large amount of concrete production has put significant impact on the energy, resource, environment, and ecology of the society. Hence, how to develop the concrete technology in a sustainable way has become a significant issue. In this paper, some of Korean researches for sustainable development of concrete are presented. These are sustainable strengthening for deteriorated concrete structure, sustainable reinforcement of new concrete structure, sustainable concrete using recycled aggregate and supplementary cementing materials and finally application of each technique to precast concrete.

APLIKASI PROGRAM TRANSYT PADA SIMPANG DI BAWAH JENUH Studi Kasus : Simpang Airlangga dan Simpang Udayana Kotamadya Mataram I Wayan Suteja; Ni Made Yuyun Cahyani
Civil Engineering Dimension Vol. 4 No. 1 (2002): MARCH 2002
Publisher : Institute of Research and Community Outreach - Petra Christian University

An intersection is a critical area of conflicting traffic caused by the conflict problems of traffic movement. This conflicting traffic leads to driver delay, accident and traffic jam. A high traffic flow increases problems due to vehicle conflict, traffic light should be set up in order to separate and merge vehicle movement within traffic flow. A coordination of undersaturated intersections could reduce delay, travel time and travel cost. A computer program called TRANSYT was used to coordinate two undersaturated intersection discussed in this project. Research variables included were traffic volume, saturation flow, speed, traffic light setting and geometrical data of the intersections. The output of TRANSYT showed that the initial performance index was Rp.12.623.500/hour and could be reduced to Rp.8.165.250/hour after coordination of the two intersections. Total delay decreased 35.7 % from the initial delay, and the travel time was 12.5% faster. The optimum offset value of both intersection coordinated was found and the minimum performance index was attained using 90 second cycle time. Abstract in Bahasa Indonesia: Persimpangan merupakan salah satu lokasi yang rawan terhadap kemacetan akibat konflik pergerakan kendaraan. Konflik pergerakan ini menyebabkan tundaan, kecelakaan serta kemacetan. Arus lalu lintas yang terlalu tinggi menimbulkan masalah karena adanya konflik yang meningkat, maka pemasangan lampu lalu lintas perlu dilakukan. Pengkoordinasian dua simpang dibawah jenuh (undersaturated) yang dianalisa, dimaksudkan untuk mengurangi tundaan, waktu perjalanan dan biaya perjalanan yang terjadi. Dari hasil analisa dengan menggunakan Program TRANSYT diperoleh kinerja simpang seperti nilai indek kinerja sebelum koordinasi sebesar Rp.12.149.550/jam dan Rp.8.164.300/jam setelah dikoordinasi, tundaan total yang terjadi berkurang 35,7 % dari tundaan sebelum dikoordinasikan dan waktu perjalanan yang lebih cepat 12,5 % dari waktu perjalanan semula. Di samping itu diperoleh juga nilai offset optimum pada kedua simpang yang dikoordinasikan serta nilai indek kinerja paling minimum yang didapat dengan waktu siklus 90 detik. Kata Kunci : konflik pergerakan, tundaan, arus jenuh, indek kinerja.

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

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.

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