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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 6 Documents

Search results for , issue "Vol. 2 No. 1 (January 2016)" : 6 Documents clear

Laboratory Study on Comparison of the Scour Depth and Scour Length of Groundsill with the Opening and Groundsill without the Opening Ani Hairani; Djoko Legono
Journal of the Civil Engineering Forum Vol. 2 No. 1 (January 2016)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

River bed control structure what so called groundsill or bottom sill is built for controlling a river bed to remain stable against degradation. Unlike other river obstacles, the presence of groundsill might cause sediment retention upstream of the structure; hence it reduces the supply of sediment to the downstream part of the river. At some extent, the above situation might create unexpected negative impact, not only cease the sediment migration but also disable fish migration, as well as the utilization of river for navigation. This paper presents the hydraulic investigation on various models of groundsill, i.e. groundsill without the opening and groundsill with a certain type of the opening. Series of laboratory experiments were conducted on an open channel flow of 0.75m width and longitudinal slope of 0.05%. There were two types of groundsill, i.e. groundsill without the opening with 0.75m width and 0.05m height, and groundsill with the opening of 0.39m width and 0.005m height of crest at the opening and 0.05m at the wings. Various flow rates were then introduced, necessary data were taken, and the hydraulic phenomena were studied. The results showed that groundsill without the opening produced non-dimensional (relative to the channel width) scour depth of 0.036, and scour length of 0.253. Groundsill with the opening produced scour depth of 0.013 and 0.024 near the downstream end of the wing section and the opening respectively. The scour length of the groundsill with the opening is 0.080 and 0.293 near the downstream end of the wing section and the opening section respectively. Moreover, it can be noted that the presence of the scour depth and scour length of the groundsill with the opening was generally much smaller rather than that of groundsill without the opening. The above results give the evidence that groundsill with the opening is much friendlier and also more suitable for the environment needs.Keywords: control structure, environmentally sound, groundsill, hydraulic phenomenon

Evaluation on Container Products in East Nilam Terminal, Tanjung Perak Port Haris Zonakis Timor
Journal of the Civil Engineering Forum Vol. 2 No. 1 (January 2016)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Development of a container terminal is needed due to a change in the region, cargo handling, ship technology, and changes in quantity demand. Performance indicators of container terminal container is needed to assess the streamlined of container terminals' operational process in serving the transportation of goods and development activities in the future. The analysis of performance indicator in container terminal will have an impact on improving the current services and future. Therefore, there should be a study to measure the performance indicator in ports or container terminals, especially in the Multipurpose Terminal East Nilam (TMNT) as an object of research. Performance of container terminal as a system with many variables influence can be analyzed with the forecasting method and related theory of applicable equations as well as the application of the model scenarios. Forecasting methods are used to determineTMNT for short-term conditions (2020), medium term (2030), and long-term (2040). The results of the data analysis for the research activities of the secondary data obtained from PT. IPC III branch of Tanjung Perak in 2013, obtained the performance TMNT including BOR (performance dock) 51% and YOR (yard performance)31%. The analysis shows that in 2040, needs a dock length of about TMNT 1,254 meters by nine moorings from existing conditions along the 320 meters with two moorings. The length of East Nilam pier that is not in the revitalization is 540 meters. The development of infrastructure is only possible along the pier 860 meters with six moorings. While the CY area needs about 5 acres from existing condition, which is around 3.8 acres. BOR value and YOR projection reach up to 161% and 145%. This evidence means that the TMNT with existing conditions cannot be used again in 2040. The application of C scenario model by adding 860 meters of dock length with six moorings, will add capacity of the dock up to600,000 TEUs, and elimination of not operating time is capable to lowering the value of the BOR become 41% and YOR become 69%.

Analysis of Runoff due to The Change in Land Use at The Watershed of Upstream Ciliwung Dwi Indriastuti
Journal of the Civil Engineering Forum Vol. 2 No. 1 (January 2016)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Climate change has triggered extreme climate such as rising temperature, high rainfall intensity, rising sea water level, drought, and others (Thuc, 2014). Challenges of sustainable development are increases in various disasters, climate change and global crisis such as land use change, soil quality degradation, limited water and mineral, environmental pollution, and decreasing in biodiversity. The cause of flooding in Jakarta is due to the overflow of Ciliwung River. The changes of land use greatly affect Ciliwung River flow. Land degradation in upstream of Ciliwung watershed (Puncak area) has triggered new problem, annual flooding, especially in downstream area. The change of surface which cannot accommodate water, increasing runoff, moreover, the change of land condition which easily saturated, greatly affected the runoff conditions in Ciliwung watershed. This research using HEC-HMS software in order to know how the land uses changes and rainfall intensity affected the runoff. By using land use maps in 2000, 2005, 2010, and rainfall data in 5 (five) rainfall station near location from 1996 to 2013, it can be known how the runoff changes. Parameter calibration is done with measured discharge in Katulampa weir for each occurrence. The parameter value used in simulation later is the real value approach. Simulation by HEC HMS using CN of Spatial Planning in Ciliwung upstream area and rainfall 25 years return period gives that the highest discharge is 226.25 m3/second and water level reaches to 317 cm. If included into the alert in Katulampa weir, then the condition faces to Alert 1 for during ±6 hours.

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

Analysis of Sedimentation in Wonogiri Reservoir Tri Joko Inti Budi Santosa
Journal of the Civil Engineering Forum Vol. 2 No. 1 (January 2016)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

The Wonogiri reservoir which has 730 million cubic meters of total storage, 90 square kilometers of water area, and 1260 square kilometers of catchment area, is located in the Wonogiri Regency, Central Java Province. It was first established in 1981 and began its operation in 1982 with the expectation that it would last for about 100 years. Today (2002) the reservoir has got a serious problem of sedimentation. The sedimentation is so large that it would decrease the capacity storage of the reservoir and would shorten the length of operation. Therefore, it is necessary to predict the sediment that comes into the reservoir. This research would be based on the total sediment calculation of the sedimentation, through some methods, such as echo sounding measured data, land erosion (USLE), the calculation of the sediment in rivers. This research calculates the sediment capacities based on the water flow data and the sediment rating curves in rivers of Keduang, Tirtomoyo, Temon, upstream reach of Bengawan Solo, Alang, and Wuryantoro. The suspended load was calculated based on the sediment rating curves, whereas the bed load was computed as the percentage of the suspended load. The sum of both calculation results would be the total sediment. The calculation result showed that the total sediment which has come into the reservoir is 6.68 million cubic meters per year. As a comparison, the writer noted that the former researcher using echo sounding method done by the Faculty of Geography of the Universitas Gadjah Mada in 1985, it found that the total sediment capacity which came into the reservoir was 6.60 million cubic meters per year or 5.40 mm per year of sheet erosion. The other research using echo sounding method done by JICA in 2000 found that the total sediment which had come into the reservoir was 4.50 million cubic meters per year or 3.50 mm per year of sheet erosion. By knowing the results of calculation of the total sediment, we can learn that different methods provide different results and it is still uncertain which one is true.

Review of Rainfall Hourly Distributionon the Island of Java Sri Harto Brotowiryatmo
Journal of the Civil Engineering Forum Vol. 2 No. 1 (January 2016)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Rainfall hourly distribution is still a very important variable in the computation of the design of some hydraulic works. It has been generally known that this distribution will defer from one to the other region. The distribution defers from that exist in this area may invite additional inaccuracy in further analysis. This review presents some works which have been done in these last years, to fulfill the absence of this distribution on the island of Java region.Keywords: telemetry system; rainfall intensity; information spreading

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