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KAJIAN PENANGANAN SEDIMENTASI DENGAN WADUK PENAMPUNG SEDIMEN PADA BENDUNGAN SERBAGUNA WONOGIRI Sardi, Sardi; Kironoto, Bambang Agus; Jayadi, Rachmad
Civil Engineering Forum Teknik Sipil Vol 18, No 3 (2008): SEPTEMBER 2008
Publisher : Civil Engineering Forum Teknik Sipil

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High rate of sedimentation in Wonogiri Multipurpose Dam may cause the dam service period to become shorter than the prior plan. The discharge of Wonogiri Multipurpose Dam is an accumulation of inflow from several main rivers, including Keduang River which is located at the east side of the dam. Keduang River supplies very high sedimentation input to the reservoir. One of the steps studied and to be implemented in the sediment countermeasure was the building of sediment pocket dam in Keduang River mouth before it enters the reservoir. The research was conducted to determine the reservoir sedimentation before and after countermeasure through a mathematical model approach. It was done by doing flow and sediment transport simulation using the NCCHE-GUI Program to calculate deposition in the reservoir. Simulation was carried out in existing condition and the condition after the sediment pocket dam was built, with the assumption that discharge was evenly distributed for each month. This simplification method was applied in wich monthly simulation was done for one hour. Simulation result was then multiplied by the number of hours allocated per month to generate the result for one year period. Simulation result indicates that annually sedimentation reduction or net deposition is 30.41% in average after the treatment by sediment pocket dam. It is also identifed from the simulation result that the reduction is relatively small, since simulation was not performed up to the condition where the pocket dam was already filled up by sediment, in which the flushing process has not been optimally simulated.

SISTEM INFORMASI MANAJEMEN JEMBATAN BERBASIS WEB DENGAN METODE BRIDGE CONDITION RATING (Studi Kasus Pengelolaan Jembatan di Kabupaten Garut) Subagio, Gatot; Triwiyono, Andreas; Satyarno, Iman
Civil Engineering Forum Teknik Sipil Vol 18, No 3 (2008): SEPTEMBER 2008
Publisher : Civil Engineering Forum Teknik Sipil

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A state progression level can be identified from the infrastructure demand. However, infrastructure projects requires high investment cost, therefore it is recessary to optimally maintain the existing infrastructure facility. Bridge management is required to maintain the bridge function and role, as well as to keep the bridge service period in line with the service period plan by using various efforts to maintain the safety, comfort, and economy in serving the traffic. The bridge management needs a lot of recent information of the bridge inventory and condition. It is required to build accurate and up-to-date information for bridge management completed with DSS (Decision Support System) to make the inventorying result to be easily understood and to determine bridge management priority. Research area in producing this system was located at Garut Regency, West Java by taking 7 bridges as samples, under Bina Marga Public Work management. WEB-based Bridge Management Information System (SIMJWEB) was software built with PHP (PHP Hypertext Preprocessor) and MySQL Database Management System. The bridge condition is visually assessed using the Bridge Condition Rating method of NYSDOT (New York State Department of Transportations). Bridge component is assessed based on Component Rating of 7 as good and 1 as worst. The total Component Rating is multiplied with Weight Factor from each component, and then divided by total Weight Factor resulting from Bridge Condition Rating that reflects the bridge condition. Treatment priority determination is based on Bridge Condition Rating Value. Information on treatment time delay is obtained from estimated bridge service period using IBMS (Interurban Bridge Management System) assumption. SIMJWEB is able to provide prompt information on the inventory, condition, proposal and management priority data, as well as the estimation of bridge service period. Such information helps the bridge manager in making decision. Through internet media, bridge user can actively participate to bridge management in a region by giving idea or following public hearing made by bridge manager. This research results show that Cipancar 1 Bridge has the highest treatment priority at condition rating of 4.874 and requires rehabilitation as the proposed treatment. The lowest priority is Cimanuk Andir bridge at condition rating of 6.587 and requires regular and periodic maintenance as the proposed treatment. By estimating that Cipancar 1 bridge plan period is 50, the Equivalent period is 28.3 years and in 22 years later, the bridge function would not be functioned anymore.

PERENCANAAN SISTEM PERINGATAN DINI BENCANA TANAH LONGSOR DI DUSUN LUCU PALONGAN DESA CAMPOAN KECAMATAN MLANDINGAN KABUPATEN SITUBONDO JAWA TIMUR Mukhlis, Teuku; Fathani, Teuku Faisal; Sudarno, Ign.
Civil Engineering Forum Teknik Sipil Vol 18, No 3 (2008): SEPTEMBER 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Lucu Palongan Sub-village is located at hills terrain which is critically prone to soil mass movement due to the morphological characteristic of plateu with steep slopes in addition to geological setting of volcanic breccia bedrock covered by colluvial sediments. The research is initiated by soil mass movement occurrence in Lucu Palongan Sub-villag. It is situated in communityâ€™s farm land which is a typical ground faulting with soil cracks subsided by 3 meters at the crown area. The study is conducted to identify the causal factors and mechanism of soil mass movement, to observe the condition of the affected areas and society, to discover the areas vulnerable to landslide effects and to plan early warning system for landslide disaster. The primary data for the research is gathered from field investigation. Analysis on the slope stability is carried out by employing SLOPE/W program. The study identifies that soil mass movement in Lucu Palongan Sub-village is a typical slide. The causal factors of soil mass movement at the researched areas are the farm lands existed on the slopes causing water on land surfaces accumulated, thence the intensity of water slipping into subsurface increases, shear strength of soil significantly diminishes due to saturation. The most vulnerable areas to landslide are Bretan and Batuampar Sub-village of Selowogo Village. The indications of soil mass movement were initially noticed by the residents of Lucu Palongan Sub-village through landslide monitoring instrument. Afterward, the information was communicated to the people of Bretan and Batuampar Sub-village.

EVALUASI SISTEM MITIGASI PENANGANAN BENCANA GEMPABUMI DI KECAMATAN BANTUL PROPINSI DAERAH ISTIMEWA YOGYAKARTA Indah, Lenni Kartika; Triatmodjo, Bambang; Triatmadja, Radianta
Civil Engineering Forum Teknik Sipil Vol 18, No 3 (2008): SEPTEMBER 2008
Publisher : Civil Engineering Forum Teknik Sipil

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A tectonic earthquake in Bantul Regency, Yogyakarta occurred at the magnitude of 5.9 Richter Scale just before 05.54 p.m. The earthquake duartion was only about one minute but killed thousands of inhabitants, destroyed uncountable number of settlement buildings and damaged other buildings of about billions rupiahs. This fact showed that disaster mitigation system has nott been effective to minimize disaster impact. To absolutely prevent the earthquake disaster to happen is indeed very impossible to do. But humans can seek efforts to take preventive measures to reduce the adverse impact of the earthquake before it occurs again. Therefore, it is necessary to carry out the system of disaster mitigation so that victims and material losses resulted from the earthquake disaster can be minimized. The research objective is to obtain the physical conditions and problems faced by Bantul Regency after the earthquake disaster, to evaluate the exercise of earthquake management, and finally to search solutions in anticipating the occurrence of the earthquake disaster. It is expected that in the future, the response and the willingness of dealing similar disaster can be prepared. A field research is conducted by using three techniques including observation, interview, and questionnaire given to village apparatuses and local society. A bottomup approach is used to ensure that the system to be developed can actually reflect the emergent needs of the community. The result of the research indicates that it is necessary to carry out several alternatives for immediate prevention and comprehensive handling of earthquake disaster by meeting objectives in appropriate strategy of mitigating measure priorities. The first priorities are given to constructing measures or structuring enduring-to-earthquake houses with priorities rank given to forming elements of enduring-to-earthquake building. The first is the frame structures (sloof, column, and block), the roof elements, and the foundation elements, the second is the measures of social aids giving, and the third is the measures of community development with education and training. The fourth is measures of economic development, and, finally, the fifth is the measures of instance and managerial development (early warning system). It is expected that the objectives of the priority strategy can help society to take any appropriate measures in anticipating the risks of earthquake disaster.

MITIGASI BENCANA BERBASIS MASYARAKAT PADA DAERAH RAWAN LONGSOR DI DESA KALITLAGA KECAMATAN PAGETAN KABUPATEN BANJARNEGARA JAWA TENGAH Parlindungan R., Ranto; Fathani, Teuku Faisal; Karnawati, Dwikorita
Civil Engineering Forum Teknik Sipil Vol 18, No 3 (2008): SEPTEMBER 2008
Publisher : Civil Engineering Forum Teknik Sipil

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This research was carried out due to the occurrence of mass movement in Kalitlaga Village Pagentan Sub-District Banjarnegara District, which was one of most dangerous area to mass movement in Province Central Java. Such movement resulted in damaged houses and road. This research was conducted to recognize and identify the direction and type of mass movement, to identify the triggering parameters and the cause of mass movement in order to provide an appropriate disaster mitigation recommendation and prevention method, as well as to introduce low cost early warning system based on community which enabled the community to prepare and operate the system in lessening the disaster risks. Secondary and primary data used in this research were derived from field investigation and study. The method of the study is analyzing the results of field study. To obtain the percentage of people understanding on disaster mitigation, landslide, and early warning system, interviews were conducted and the interviews outputs were processed using the SPSS software. Result shows that the landslide is predominantly northeastern ward and slump type of movement. To the number of leaky water pipe and infiltrations into the ground induce the mass movement. This movement is due to geological factors such as geomorphology factor and existence of clay stone as well as high rainfall factor. The community low understanding on disaster mitigation represents the reason to install simple and cheap early warning system community based disaster mitigation. Such mitigation is easier to apply than technology based mitigation. It is also more suitable prior to a disaster. Community participation and also support from government are the key efficacy of disaster mitigation.

MITIGASI BENCANA ALIRAN DEBRIS SUNGAI BELANTING SECARA NON STRUKTURAL DESA BELANTING KECAMATAN SAMBELIA KABUPATEN LOMBOK TIMUR â€“ NUSA TENGGARA BARAT Legiarto, Ahad; Legono, Djoko; Haryono, Haryono
Civil Engineering Forum Teknik Sipil Vol 18, No 3 (2008): SEPTEMBER 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Belanting village, situated in the foot of Rinjani mountain range and crossed over by Belanting River, is a fast-growing village. Almost all of its inhabitants are migrants who came there on their own support. On January 21, 2006, a disaster strucked: debris flow came, taking peopleâ€™s lives and creating havoc to local infrastructures. One of the difficulties in the area is that the lack of non-structural disaster mitigation. At this rate, a study is required concerning the awareness of local inhabitants of the threat posed by debris flow hazard. The objective of the study is to identify the level of local peopleâ€™s understanding on debris flow disaster, to be functioned as determining basis for disaster management pattern by non-structural mitigation. Data were collected from questionnaires and interviews for 80 respondents. The resulting questionnaire data were then analyzed using SPSS (Statistic Pocket for Social Science). Result of the analysis indicates that 52.5 per cent of respondents have not understood the threat of disaster. In the meantime, the interviews indicate that religious leaders (Tuan Guru) hold high social status. Based on the result of the analysis and interviews, there is a need for a strategy in non-structural mitigation program and, as far as the study is concerned, socialization during public religious learning regarded as more effective and efficient efforts.

PENGGUNAAN PASIR BESI DARI KULON PROGO DENGAN BERAT JENIS 4,311 UNTUK MORTAR PERISAI RADIASI SINAR GAMMA Putra, Hendra; Satyarno, Iman; Wijatna, Agus Budhie
Civil Engineering Forum Teknik Sipil Vol 18, No 3 (2008): SEPTEMBER 2008
Publisher : Civil Engineering Forum Teknik Sipil

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The radiation effects of radiology and x-rays equipments do not only give excellent benefit for human, but also harmful effect at the same time. Protecting people form the radiation is an important aspect to control such harmful effect. Hence every nuclear installation and radiology unit must pay attention on protecting surrounding people from the radiation. Lead is commonly used as component of shield, but the use of lead requires special work and energy. In economical aspects, the cost of such effort is relatively expensive, but in workability aspects, the application of iron sand mortar can be used as alternative material to protect from radiation. This study assessed gamma radiation absorption on mortar cube sample with dimension of 15 x 15 cm and thickness variation of 1 cm to 15 cm. Mortar ingredient consisted of iron sand, cements and water, with cements - iron sand volume ratio of 1 : 6. Water cement ratio was determined at 0,4 and the gamma radiant energy applied were Iodine-131 (131I) denergi 284,00 keVs, 364,00 keVs, 637,00 keVs and Caesium-137 (137Cs) dissociation energy of diatomic 662,00 keV. Physical test gradation conducted to iron sand from Congot beach Kulonprogo regency of Daerah Istimewa Yogyakarta Province, showed specific gravity of 4,331 with, Ssd specific gravity of 4,330, unit weight of 2,554 gr/cmÂ³, water absorbency 0,442%, and grain finest modulus of 1,33, which was categorized as zone IV (smooth gradation). Compressive strength and specific gravity of Iron sand mortar at 28 days reached 7,92 MPa and 2,59 respectively. Especially, specific gravity was heavier than ordinary cements mortar with average value ranged from 1,80 - 2,20. Coefficient linear magnitude attenuation (Î¼) of iron sand mortar at radiation energy 284 keVs, 364 keVs, 637 keVs and 662 keVs were 0,2816 cm-1, 0,2253 cm-1, 0,1297 cm-1 and 0,1003 cm-1 respectively. Based on these relation, the line equation obtained was y = 0,5631e(-0025X).

PERANCANGAN LABORATORIUM CAMPURAN HRS-WC DENGAN PENGGUNAAN BUTON GRANULAR ASPHALT (BGA) SEBAGAI BAHAN ADDITIVE Howardy, Howardy; Suparma, Latif Budi; Satyarno, Iman
Civil Engineering Forum Teknik Sipil Vol 18, No 3 (2008): SEPTEMBER 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Increasing demand for asphalt in the country results in 650,000 tons of imported asphalt per year. The early damage of asphalt pavement is due to increasing axle loads and high temperature climates. On the other side, natural asphalt in Buton island of Sulawesi Tenggara, which is the biggest natural asphalt deposit district in world containing about 677 million tons of asphalt, has not been optimally exploited. This research designs HRS-WC mixture by utilizing Buton Granular Asphalt ( BGA), one of Buton asphalt form, as additive in the binder. The objective of this research is to identify mixture characteristics by referring to Marshall characteristic. Mixture is designed under the Marshall Standard procedure and 24 hours Marshall Immersion at optimum binder content according to Indonesian specification (Bina Marga, 2005) for Hot Rolled Sheet-Wearing Course ( HRS-WC). Mixture design applies the additive BGA (Buton Granular Asphalt) variations of 0%, 2%, 4%, 6%, 8% and 10% to the total mixture. The results of the research showed the optimum asphalt content of specimen Buton Granular Asphalt (BGA) variations of 0%, 2%, 4%, 6%, 8%, and 10% were 8.3%, 7.7%, 7.2%, 6.7%, 6.4%, and 6.3%, respectively. The misture reached the Stability values at 1373.8 kgs, 1554.9 kgs, 1493.1 kgs, 1419.3 kgs, 1230.0 kgs, and 1429.3 kgs, respectively. Index of retained strength obtained were 98.1%, 75.4%, 87.9%, 93.0%, 98.6%, and 80.5%, respectively. Composition suitable for addition Buton Granular Asphalt (BGA) at HRS-WC mixture were 2% and 4% BGA, with the mixture density values of 2.266 gr/cm3 and 2.218 gr/cm3, mixture VMA values of 19.9% and 18.9%, mixture VFWA values of 74.7% and 71.4%, mixture VITM values of 5.0% and 5.4%, mixture Stability values of 1554,9 kgs and 1493,1 kgs, mixture flow value of both of 3,0 mm, mixture MQ values of524.1 kg/mm and 493.1 kg/mm, mixture Index of retained strength of 75.4% and 87.9%.

PENGGUNAAN GULA PASIR LOKAL SEBAGAI PLASTICIZER PADA ADUKAN MORTAR UNTUK PEMBUATAN CONBLOCK Rifany K., Dian; Satyarno, Iman; Tjokrodimuljo, Kardiyono
Civil Engineering Forum Teknik Sipil Vol 18, No 3 (2008): SEPTEMBER 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Cement mortar (cement, sand and water mixture) has been widely applied as building materials, such as cement plaster, conblock, concrete brick, roof tile, etc. To obtain good quality conblock, one of the efforts is by adding cane sugar the plasticizer into a mortar mixture. Although cane sugar addition can reduce the use of cement and water, but the mortar workability degree can still be maintained. Reduction of the cement used also reduces the cost needed to make the cement mortar, which produces a more economical conblock. The objective of this research is to identify the cement ratio, specific gravity, compressive strength, water absorption, and endurance of the conblock through the abrasion test. This research was carried out in the Construction Material Laboratory of Civil and Environmental Engineering Department of Gadjah Mada University. Conblocks used as samples were ones produced by Diamond Baru Conblock Baru Yogyakarta. The materials for producing material consisted of Portland cement Type I produced by Gresik cement factory, and sand from Krasak River in Yogyakarta. The local cane sugar used was produced by Madukismo Sugar Factory in Yogyakarta. The mixture samples were made using cement-sand at various ratios of 1:2, 1:4 and 1:6. For each ratio, two types of samples were made and one of them was added with cane sugar at 2% of the cement weight. Twenty samples of conblock specimens were made for each variation, both for with and without cane sugar addition. The conblock dimension was 200 x 100 x 80 mm. The specimens were given fresh and hardened conblock test and measurement after 28 days after they were made. The research results indicated that cane sugar addition gave insignificant effect to the reduction of cement and water in the mixture because plasticizer material reached cement decrement less than 3%. The compressive strength decreased to 2.5%, 10% and 9% than the normal conblock at the volume ratios of 1:2, 1:4 and 1:6, respectively. Results of compressive strength test showed that samples met the conblock quality standards as referred by SII 0819-83 class I and II. Material cost of conblock m3 with cane sugar addition was 3% cheaper than normal conblock.

EVALUASI TINGKAT KERUSAKAN JALAN DENGAN METHODE PAVEMENT CONDITION INDEX (PCI) UNTUK MENUNJANG PENGAMBILAN KEPUTUSAN (Studi Kasus: Jalan Lingkar SeLatan, Yogyakarta) Suswandi, Agus; Sartono, Wardhani; Christady H, Hary
Civil Engineering Forum Teknik Sipil Vol 18, No 3 (2008): SEPTEMBER 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Being functioned as the main transportation line for passengers and cargo, any distress on the pavement of South Ring Road in Yogyakarta requires rehabilitation to prevent severe condition. But before the rehabilitation is carried out, it is required to evaluate the road pavement condition. The objective of this study is to appraise or to value the road pavement condition. This research implementation was visually completed by using Pavement Condition Index Method. It was started by dividing the road into several research units in 100 x 3.5 m by size for each unit sample. Then, each of the research unit was observed and measured to identify the distress type and severity level in order to obtain PCI rating value of the pavement. Result of the study showed that the distress types included the alligator cracking, block cracking, depression, longitudinal and transverse cracking, patching, polished aggregate, shoving, slippage cracking and weathering/graveling. The prevailing ones were block cracking and alligator cracking. The damages occurred only on some parts of the segment. Therefore, it was better to adjust the treatment for such damage for the distress type. Treatment priorities should be given to sample unit 23 B (lane 1) due to its smallest PCI value, which was 22, with VERY POOR condition pavement rating.

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