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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.

Arjuna Subject : -

Articles 225 Documents

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DEBRIS FLOW DISASTER MITIGATION THROUGH COMMUNITY-BASED INTEGRATED SEDIMENT MANAGEMENT (BEST PRACTICE IN MT. MERAPI AREA, INDONESIA) Kazuhiko Otani; Suharyanto Suharyanto
Journal of the Civil Engineering Forum Volume: XXI/3 - September 2012
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Mt. Merapi is one of many active volcanoes in Indonesia which erupts frequently. The small eruption occurred nearly every year, whereas the big ones occurred at approximately once every five years. The eruption often produces impacts at both positive and negative view points, such as production of sediment as construction material and damage on infrastructures due to debris flow occurrences respectively. The eruption produces two types of disasters, i.e. primary disaster (such as ash fall, pyroclastic flow, and lava flow), and secondary disaster such as debris flow. This paper presents the long term effort on the development of community participation in the sand mining management as one of strategic disaster mitigation activities. The raising awareness of the community on the necessity of conducting proper sand mining management and its effect on reducing the risk due to debris flow disaster has shown the effectives of the approach being introduced. The local government acceptance on the presence of the community participation in the whole system of sediment management may involve further collaboration between the local government authority and community society in the future.

TRAMWAY MANAGEMENT SYSTEM IN INDONESIA Melia Damayanti; Siti Malkhamah; Karen Walker
Journal of the Civil Engineering Forum Vol. 1 No. 1 (January 2015)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Tramway systems, which can carry more passengers than buses at one haul, are now being proposed to meet Indonesia’s public transport requirement. The objective of this research is to analyze the management structures for operating tram in different countries and then propose a suitable organizational structure for operating trams, if re-introduced, in Indonesia. The author chose France (Montpellier tramway), Germany (Karlsruhe tram-train) and the UK (Nottingham Express Transit) as the role model countries for investigation. From the analysis, the most appropriate organizational structure and suitable tramway management structure for operating tramways implementation in Indonesia. The key features of the research are to establish public transport company by local government to manage all public transport systems, propose tramway construction and operation to exist as separate departments under the tramway team division of the public company, recommend the public transport company to have responsibility for overseeing construction of the trams, operating, and maintaining the trams, suggest local government to own them and have responsibility for tramway strategic policy, control regulation as well as supervision and coordination of the performance of the public transport company, propose joint working between public and private sectors.

Effect of the Skilled Worker Certification on the Sustainable Infrastructure Development Nurin Pramadini; Inggar Septhia Irawaty; Ashar Saputra
Journal of the Civil Engineering Forum Vol. 3 No. 1 (January 2017)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Infrastructure plays an important role in the occurring development process, in which the human resource is an important factor in it. This research was conducted in the work area of the Construction Training Agency Region II Surabaya Unit (Balai Pelatihan Konstruksi Wilayah II Surabaya). The data were collected by using questionnaire or questions list, which was given to the provider and the user of the skilled labor—consisted of 60 people of 30 certified skilled workers and 30 non-certified skilled workers. The data was processed by using SPSS. The result showed that the number of certified skilled workers that know the characteristic of sustainable infrastructure is higher when compared with the non-certified skilled workers. The average 95.4% of certified skilled workers know about the characteristic, while it’s 91.1% in the non-certified skilled workers. Certified workers that implement the characteristic of sustainable infrastructure is of 75.9% and 62.8% of noncertified workers do the aforementioned. According to the calculation, there is some influence between the knowledge of sustainable infrastructure characteristic and the project implementation, based on 57 from total 65 research variables.

Valuing Manggarai Station – Soekarno-Hatta International Airport Rail Link Using Stated Preference Approach Wahyu Tamtomo Adi
Journal of the Civil Engineering Forum VOLUME: XXII/2 - MAY 2013
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.18912

This study attempts to identify the characteristics and preference of the SHIA airport travelers, estimate the subjective value of in-vehicle time and waiting time by providing choice experiments regarding the available modes in combination with the Airport Rail Link (ARL) service as hypothetical situation, analyze how the values vary according to the socio-demographics of respondents and forecasting the mode sharing and the elasticity based on several scenarios. Five hundred respondents as potential demand for the airport access mode from both the online and on-field survey in Jakarta value reliability as the most important factors followed by comfort, journey time, fares and safety, while the most reliable journey according to the respondents is by train.After various attempts to best analyze the data, statistically significant result is obtained from MNL and Nested models. The values of IVT vary between 632 Rupiah/Minute and 871 Rupiah/Minutes, the values of waiting time vary between 901 Rupiah/Minute and 1,504 Rupiah/Minute. The results of unobserved parameters from the alternative modes are satisfactory negative for bus and positive for ARL alternative.The segmented models results vary that the value of male is higher than female, the value of high income is higher than low income, the values of taxi user is higher than car user, the value of business traveler is higher than leisure and commuter traveler, the value of self-finance journey is lower than the journey paid by the company. With the standard level of service, the probability result of mode sharing shows that the majority of respondents will use the train service (40.99%), followed by the other modes: bus (30.90%), car (16.52%), and taxi (11.59%).Keywords: Jakarta, SHIA airport, access mode, value of in-vehicle time, value of waiting time, model segmentation, mode sharing.

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.

Analysis on Railway Infrastructure Utilization Priority Factor Variation on Track Access Charges (TAC) Sekar Mayang; Imam Muthohar
Journal of the Civil Engineering Forum Vol. 2 No. 2 (May 2016)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

In Presidential Decree Republic of Indonesia Numb. 53 in 2012, it is explained that every railway operator which use railways infrastructure have to pay Track Access Charges (TAC) to Government. The rules of the calculation of TAC which have to be paid by PT.KAI is explained in Regulation of Transport Minister Numb. 62 in 2013. In this regulation, there is priority factor which has same value for every service type of the train (Fp=1). Actually, every service type of railway has different priority and gives different damages for infrastructure based on the speed. This research intended for analyzing the influence of priority factor to TAC. Quantitative description method is used in this research. The objects of the research are Executive, Business, and Economic class of passenger train in Java. It suggested with two alternatives calculation of TAC with variations in priority factor (Fp) which oriented on train travel time. Then, the best Fp is chosen which represented the real condition where the train with higher priority has to pay higher TAC than that of others. The result of this research, with Fp=1, showed the value of TAC for Economic class is IDR 68.00/GT/km, for Executive class is IDR 30.00/GT/km, while for Business class is IDR 28.00/GT/km. A modified of Fp, with two alternatives calculation, considering travel time and stay time of each railway service type showed a better result. The first alternative generates Fp= 1.39 for Executive class and gives IDR 42.00/GT/km for the average TAC, while Fp=1.21 for Business class and generates IDR 34.00/GT/km for average TAC. The second alternative generates Fp=3.00 for Executive class and it gives IDR 91.00/GT/km while for Business class generates Fp=2.00 and it gives IDR 56.00/GT/km. The calculation of TAC with second alternative is more represents the real condition, where Executive class has higher priority and speed than the other classes, so it also has to pay higher TAC.

COMPEREHENSIVE TECHNICAL STUDIES OF FLOOD CONTROL OVER SOLO CITY AREA (CASE STUDY IN DEMANGAN BARRAGE) Ali Trusharyanto; Rachmad Jayadi; Darmanto Darmanto
Journal of the Civil Engineering Forum VOLUME: XXII/3 - SEPTEMBER 2013
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.18903

City of Surakarta, known as Solo City is one of cities in Central Java Province traversed by Bengawan Solo River. Heavy rainfall in upstream area of Bengawan Solo River causes increase in high water level at downstream. Bengawan Solo River will be higher than water level in drainage system which may induce a backwater flow. Since Colonization era, the government has built dikes and barrages against backwater flow and inundation problem. One of the barrages was Demangan Barrage dividing river flow into Bengawan Solo River and Pepe River. It was equipped with total capacity pump of 12,3 m3/s. The inundation is not only caused by the backwater flow coming from Bengawan Solo River, but also surface runoff as the result of the excess rainfall which cannot be drained gravitationally to the main river if the gate was closed. Therefore, comprehensive study combining hydrology and hydraulics analysis is highly needed in order to achieve more effective flood control management.Hydrology analysis was done to estimate the direct runoff hydrograph from catchment area in Solo City to downstream of Pepe River. While in hydraulics case, hydraulic parameter in downstream of Pepe River influenced by Bengawan Solo River stream was analyzed. Both studies were simulated using software HEC-RAS 4.1.0 version. The simulation considered drainage channel, gate, pump system and dike in Pepe River downstream.Simulation using 10 years of return period in Solo City and average annual water level in Bengawan Solo River showed that Pepe River can flow through the gate, while the highest water level is still below the dike. Simulation considering 10 years of return period, water level hydrograph of Bengawan Solo River, existing pump, and gate operation inferred that Pepe River surpassed top of dike. Capacity of required pump should be more than 168,3 m3/s in order to pass 10 years of return period. By combining operational of existing pump and dike elevated up to +87,63 m, capacity of required pump became lesser which was approximately 120,3 m3/s. Simulation of HEC-RAS conducted by operating pump automatically on critical elevation without heightened dike obtained the total capacity of pump was 132,3 m3/s.Keywords: barrage, pump operation, Bengawan Solo River, flood control management.

ACCURACY OF INDEX FLOOD METHOD APPLIED IN TWO DIFFERENT REGIONS IN INDONESIA R. T. Lopa
Journal of the Civil Engineering Forum Volume: XXI/1 - January 2012
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Problems of having relatively accurate estimates of design discharge values in ungauged catchments remains. There is an empirical equation in the area which gives appropriate estimates, but it needs some efforts in measuring catchment parameters, which is time consuming in line with the catchment area. A relatively simple method in doing so is the known Index Flood Method. The accuracy of this method in its application in Indonesia has never been examined. An understanding of its accuracy will provide the design with more confidence. Keywords: Index flood method, direct flood method.

Retrofitting on Flexural Strength of RC Columns Using Polyester Resin Concrete Dahlia Patah; Ashar Saputra; Andreas Triwiyono
Journal of the Civil Engineering Forum Vol. 2 No. 1 (January 2016)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Concrete column structures damages due to flexural moment need to be repaired and strengthened to avoid of sudden failure by applying appropriate methods. The method applied in this study was retrofitting by applying polyester resin concrete. In order to know the effect of polyester resin concrete against axial load capacity, stiffness, ductility and the damage pattern of columns by eccentrically loaded, an experimental laboratory was carried out. In this study, three column specimens are tested. The dimension of the specimen is 150 mm x 150 mm and the high of the column are 1200 mm with the effective high is 600 mm and 600 mm for corbel. The column specimens have a fixed eccentricity of 50 mm. First, initial column tested before yield point of reinforcing bar reached and concrete crack limited to 0,4mm. Further, retrofitting applied to each initial column specimen using normal concrete and polyester resin concrete with the level of resin 15% and 20%, respectively. Retrofitting column tested again with the same loading of initial column until it reaches the collapse load. The result of experiment compares to analysis method by Nawy and Whitney which represent the analysis of normal concrete column capacity. The result showed that levels of resin to be used is 20% because of better workability compared to 15% resin. Further, compressive test on resin concrete cylinder showed that the resin level at 15% and 20% are 82.82 MPa and 76.65 MPa, respectively. The strength of KR-ii decreased about 33.523%. The strength of KR-15ii and KR-20ii increased 5.08% and 24.827% respectively compared to initial column. Specimen column stiffness KR-ii. KR-15ii and KR-20ii decreased about 76.22%, 24.50% and 37.65%, respectively from the initial column. Furthermore, ductility of KR-ii, KR-15ii and KR-20ii decreased about 1.512, 1.250 and 2.50, respectively. The changes of the ultimate capacity load of KR-ii, KR-15ii and KR-20ii by Nawy Method respectively -26.54%, 12.66%, and 13.83%, whereas the method of Whitney respectively -17.68%, 26.25%, and 27.56%. The use of polyester resin concrete can change the pattern of collapse from brittle to ductile columns.Keywords: retrofit, ductility, stiffness, flexural column, eccentricity

Sediment Transport Analysis of Sesayap River, Malinau District, North Kalimantan Hardhi Rafsanjani
Journal of the Civil Engineering Forum Vol. 3 No. 3 (September 2017)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

River could have a very important role in improving the economy of a country when it is correctly and properly utilized. Nevertheless, rivers in Indonesia also have various problems, i.e. erosion and sedimentation which occur in many Indonesian rivers, one of it being the Sesayap River. Because of these problems, it is very important to do analysis on bed load transport, in order to find its amount in the existing river, so that optimal handling on the occurring erosion and sedimentation problems could be performed. This research aimed to obtain the amount of bed load transport in Sesayap River, and then compare it to the field condition. The approaches used in this bed load transport analysis were Einstein approach and Frijlink approach, with data required for the analysis, which was water level elevation, topography data, and sediment gradation data. Based on the result of conducted bed load transport analysis, the bed load transport analysis result in Seluwing area was higher than in the Port area. Therefore, sediment deposition or sedimentation would occur in the river segment on between both locations. Qualitatively or tendentiously, the above results showed consistency with what actually happened, or observed, in the field. If it assumed that the equivalent diameter of bed load is 8 mm, the total of bed load transport on Seluwing area and Port area with Einstein approach are 1,582,263 m3 and 1,219,181 m3. Therefore, the sedimentary deposit per day could be calculated by calculating difference of bed load transport volume divided with total of the calculation day; which resulted sedimentary deposit per day of 2,859 m3. Whereas by using the Frijlink approach, the total of bed load transport on Seluwing area and Port area were of 1,391,940 m3 and 1,080,200 m3, and sedimentary deposit per day of 2,455m3. Based on the results, in order to normalize the Sesayap River, the dredging needed is 2,859m3/day based on Einstein approach and 2,455m3/day based on Frijlink approach.

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