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Journal of the Civil Engineering Forum

jcef
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Published by Universitas Gadjah Mada

ISSN : 25811037 EISSN : 25495925 DOI : -

Core Subject : Social, Engineering,

Civil Engineering, Building, Construction & Architecture Environmental Science

Journal of the Civil Engineering Forum (JCEF) is a four-monthly journal on Civil Engineering and Environmental related sciences. The journal was established in 1992 as Forum Teknik Sipil, a six-monthly journal published in Bahasa Indonesia, where the first publication was issued as Volume I/1 - January 1992 under the name of Forum Teknik Sipil.

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Articles 7 Documents

Search results for , issue "Volume: XX/1 - September 2011" : 7 Documents clear

UTILIZATION OF TORAY FLY ASH AS FILLER SUBSTITUTION IN THE HOT ROLLED SHEET-WEARING COURSE (HRS-WC) MIXTURE F. Candra; L. B. Suparma
Journal of the Civil Engineering Forum Volume: XX/1 - September 2011
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

In road construction materials, the utilization of fly ash as additive materials is limited and also small in quantity, while the disposal of fly ash is quite high. An abundance of fly ash can be found at PT Toray Company in Jakarta and Surabaya. Toray fly ash is disposed coal ash resulting from coal-fired electricity generating power plants. Toray fly ash in this research is used as substitute mineral filler in asphalt paving mixtures. Research on utilization of Toray fly ash as filler is conducted in the Hot Rolled Sheet – Wearing Course Mixture. Filler content in the HRS –WC mixture is 9%. Variations of Toray fly ash in the mixture tested are 0%, 25%, 50%, 75%, 100% and the variations of asphalt content are 6%, 6.5%, 7%, 7.5%, 8%. Marshall test is performed to determine the Optimum Asphalt Content and Marshall Stability, Indirect Tensile Strength (ITS) test and Tensile Strength Ratio (TSR) to select the optimum Toray fly ash utilization in the mixture based on the moisture susceptibility of specimens. The research results show that in variations of 0%, 25%, 50%, 75% and 100% Toray fly ash in the HRS-WC Mixture, the Optimum Asphalt Contents are at 6.8%, 7.0%, 7.0%, 7.1% and 7.6% and Marshall Stability values of the variations are 1649 kg, 1541 kg, 1568 kg, 1678 kg, 1718 kg respectively. TSR values in variations of Toray fly ash are 98.32%, 90.28%, 89.38%, 87.62%, 64.71% respectively, with Minimum TSR value required is 80%. Based on the overall parameters, the optimum Toray fly ash utilization in the HRS-WC Mixture recommended is 75% of Toray fly ash at 7.1% Optimum Asphalt Content.

SENSITIVITY ANALYSIS IN FLEXIBLE PAVEMENT PERFORMANCE USING MECHANISTIC EMPIRICAL METHOD (CASE STUDY: CIREBON–LOSARI ROAD SEGMENT, WEST JAVA) E. Samad
Journal of the Civil Engineering Forum Volume: XX/1 - September 2011
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Cirebon – Losari flexible pavement which is located on the North Coast of Java, Indonesia, is in the severe damage condition caused by overloading vehicles passing the road. The need for developing improved pavement design and analysis methods is very necessary. The increment of loads and quality of material properties can be evaluated through Mechanistic-Empirical (M-E) method. M-E software like KENLAYER has been developed to facilitate the transition from empirical to mechanistic design methods. From the KENLAYER analysis, it can be concluded that the effect of overloading to the pavement structure performance is difficult to minimize even though the first two layers have relatively high modulus of elasticity. The occurrence of 150%, 200%, and 250% overloading have a very significant effect in reducing 84%, 95%, and 98% of the pavement design life, respectively. For the purpose of increasing the pavement service life, it is more effective to manage the allowable load.

THE FLEXURAL STRENGTH AND RIGIDITY OF ALBASIA NAIL-LAMINATED BEAM J.A. Tjondro; H. Budianto; W. Aryakusuma
Journal of the Civil Engineering Forum Volume: XX/1 - September 2011
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

The horizontally and vertically nail-laminated beams were tested in this experimental study. Twelve specimens of horizontally nail-laminated beam with the same cross section and variation of four nail spacings were tested. Nine specimens of vertically nail-laminated beam with the same nail spacing and three variations of cross sections, namely rectangular, I and box also were investigated. The hardwood fast growing species, Albasia (Albizia Falcata) was used. All specimens were made from four Albasia wood planks with approximately has the same cross section area. The flexural strength, rigidity and ductility of beams were investigated. The vertically nail-laminated beam has greater strength and rigidity than horizontally nail-laminated beam, but less in ductility.

DIFFERENT WAYS OF CALCULATING CATCHMENT RAINFALL: CASES IN INDONESIA F. Balany
Journal of the Civil Engineering Forum Volume: XX/1 - September 2011
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Uncertainty in obtaining average catchment rainfall remains a basic question to which commonly (almost) nobody has any attention in the design of waterworks. Little attention is given to the influence of the applied method on the final design values. Applying Thiessen polygon for almost every effort of obtaining catchment average is still questionable since there are two other methods which are also often used. Up to now, there is no reliable information to which method is the best among the three most commonly applied methods. This study explores the behavior of the three methods of obtaining catchment rainfall, which are mean arithmetic, Thiessen polygon and isohyetal method. The accuracy is obtained by comparing the calculated design values computed by Unit Hydrograph and those obtained by frequency analysis of recorded discharge. The result says that no methods consistently superior.

STABILITY OF UNDERWATER STRUCTURE UNDER WAVE ATTACK C. Paotonan; D. B.P. Allo
Journal of the Civil Engineering Forum Volume: XX/1 - September 2011
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Geotube is, among others, a type of coastal structure that is increasingly accepted for coastal protection especially underwater breakwater. Besides its relatively low cost, it has other advantages such as flexibility, ease of construction and the fact that it can be filled with local sand material. Similar to all other coastal structures, it should also be stable under wave attack. A simple theoretical approach based on linear wave was adopted to estimate the stability of such structure. The theoretical solution was then compared with an experimental study. The experimental study was conducted at the Hydraulics and Hydrology Laboratory of Universitas Gadjah Mada. However, instead of a real geotube, PVC pipe was used where the weight of the PVC was varied by adjusting the volume of sand in the pipe. The result indicated that the agreement between the theoretical solution and the experiment was encouraging. The analytical solution may be utilized to predict underwater pipe stability under wave attack with certain degree of accuracy.

PERFORMANCE EVALUATION OF THE IRD RSUP DR. SARDJITO BUILDING TO THE INFLUENCE OF EARTHQUAKE T. S.M. Aritonang; I. Satyarno; B. Supriyadi
Journal of the Civil Engineering Forum Volume: XX/1 - September 2011
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

In performance-based design, the level of performance of hospital buildings is generally operational, where the buildings are expected to continue to function after the occurrence of the earthquake and do not undergo significant damage. This research evaluates the level of performance suitability of the Emergency Care Installation Buildings of Dr. Sardjito Hospital (hereinafter referred to as IRD RSUP Dr. Sardjito building) for the effects of earthquakes. First evaluation is done by Rapid Visual Screening by FEMA 154 (2002), then continued with more detailed evaluation based on FEMA 310 (1998). The building structure is modeled by SAP2000 and created in 2 models, i.e. the Models with wall and the Models without wall. The earthquake loads refers to SNI 1726-2002. The strength of structural elements is calculated with SNI 2847-2002 and Response-2000. For evaluation of structure performance levels, a pushover analysis used for nonlinear procedures, where the analysis used to the Seismicity region 3 and 4. Performance point is determined by Capacity Spectrum Method based on ATC-40 (1996), which has built-in in the SAP2000 Program. The performance level of the building is determined by drift ratio criteria required by FEMA 356 (2000) as well as ATC-40 (1996). From the research results, it is obtained that the natural period for the Model with wall is 0.592 seconds and 1.687 Hz frequency, and natural period for Model without wall is 1.291 seconds and 0.774 Hz frequency. Therefore, the level of structure performances for earthquake return period of 500 years is immediate occupancy.

TRIP ASSIGNMENT MODEL WITH CONSIDERATION OF VEHICLE EMISSION: CASE FOR CIMAHI CITY Herawati Herawati
Journal of the Civil Engineering Forum Volume: XX/1 - September 2011
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Many cities in Indonesia are facing problems related to traffic and transportation such as Cimahi city which is located in the west part of West Java, Bandung. Traffic growth in Cimahi is caused by industrialisation and urbanisation which represent the main factor of increasing population and travel demand in Cimahi. The Local Government of Cimahi has started to avoid congestion by improving infrastructure facilities or other traffic management. Traffic assignment in four-step modelling is carried out as a basic to simulate the traffic management system. Traffic congestion generally happens especially in peak periods caused by the increasing number of private cars. Based on the reasons, the study only considers private car as a mode of transportation that will be assigned in peak hour periods. The technique of assignment used is user equilibrium and traffic assignment is run by using generalized cost. Generalized cost is calculated by actual cost and perceived cost (emission cost). CUBE software has been employed for this research to analyze traffic performance. CUBE software applies existing condition (base) and four scenarios. After modeling scenarios, those are acquired that scenario 4 as the best alternative for congested reduction in Cimahi. Indeed, Scenario 4 is recommended because significant result of v/c ratio value reduction and reducing number of congestion links by considering emission cost.

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