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Civil Engineering Forum Teknik Sipil
Published by Universitas Kristen Petra Surabaya
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
Arjuna Subject : -
Articles 54 Documents
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PENGELOLAAN SEDIMEN KALI GENDOL PASCA ERUPSI MERAPI JUNI 2006 Rahmat, Ali; Legono, Djoko; Kusumosubroto, Haryono
Civil Engineering Forum Teknik Sipil Vol 18, No 2 (2008): MEI 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

The Gendol River, with its catchment area of 66 km2 and the river length of about 22 km, originates from the south east of Mount Merapi. Nineteen sabo dams have been built in order to anticipate and control sediment disaster. The most upstream dam is Kaliadem (+1.100 msl) and the most downstream dam is consolidation dam of GE-C0 (+163 msl). Sand mining occurs at several points along the river and cause environmental damage. In order to conserve environment and to maintain sediment balance a proper sediment management is required. The research is conducted based on sediment balance. The analysis of transportable sediment volume (VS) is conducted using empirical formula of Takahashi (1991) and Mizuyama (1977). Over flow sediment volume (VE) was analyzed using empirical equation of Shimoda (1995). Sediment balance was analyzed based on maximum daily rainfall (R24) with 25 years return period. The result of the study shows that the sabo system in Gendol River effectively works to control lahar flow. As a conclusion, the existing sabo dams are able to maintain sediment balance in Gendol River. The possible amount of sand mining is estimated about 1.253.422 m3 and the allowable daily sand mining volume is estimated about 836 m3 per day.
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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Abstract

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.
SISTEM PENDUKUNG KEPUTUSAN ALTERNATIF PEMELIHARAAN GEDUNG SEKOLAH (Studi kasus: SLTP Negeri I Pakem) Priyosulistyo, Hrc.; Sudarmoko, Sudarmoko
Civil Engineering Forum Teknik Sipil Vol 18, No 1 (2008): JANUARI 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

The performance of the building declines in line with the age of the building. To maintain the performance of the building, the building maintenance should be carried out. For this reason, an adequate program that able to analyze cost as well as condition of the building has been developed in this research. The assessment was carried out in a secondary school building in Pakem Sub Regency of Yogyakarta. The research used Analyzes of Hierarchy Process (AHP). Besides, the maintenance cost was also considered in the analysis. The secondary school has several buildings. Each building consists of structural, architectural and utilities components. This research mainly studied the performance of the architectural components rather than other components. The architectural components consists of classrooms, office rooms and supporting rooms. In every room, architectural element such as ceiling, wall, window, door and floor are subdivided into their accompanying elements. The elements were then weighted in accordance with their functions. The severities of their conditions were assessed in terms of percentage of the deterioration. The residual condition was determined by reducing the index condition (100 is best condition). The accumulative index condition was then represented the condition of every room. The determination of the priority was carried out on the basis of the ratio between increment of the condition (from the existing condition to the best condition) and the cost implied on the maintenance. The priority would go to the highest ratio. An analysis result indicate that among 37 rooms perceived, the class rooms obtained first priority followed by office room and then supporting room. The three first sequence priority among sixteen class rooms are classroom VIIA, the natural science laboratory and classroom IIIA. Among four rooms in office room groups, three first priority are Teacher room, Administration room, Headmaster room, and among seventeen room of supporting room groups, the three first priorities are parking area, canteen room, medical room.
PEMANFAATAN LIMBAH KERTAS KORAN UNTUK PEMBUATAN PANEL PAPERCRETE Gunarto, Arief; Satyarno, Iman; Tjokrodimuljo, Kardiyono
Civil Engineering Forum Teknik Sipil Vol 18, No 2 (2008): MEI 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

The availability of natured material for construction is so limited and in the other hand it’s demand increase. The consequence is try to explore alternative materials such as waste material which has not been explored as construction material. The recycled paper were chosen to be used as a filler component and mixed with cements as a bonding agent. Hence paper fiber include other paper ingredients will become construction material and at the same time to minimized the impact of waste paper to environment. One of the way to enhanced the paper and cements mixture quality as a component of concrete panel were by adding an admixture. Cements and water mixture are the bonding agent, while the filler material are paper and sugar cane admixture as the retarder. This mixture can be categorized as a light concrete. If it used as a papercrete panel will be the alternative building element to reduc dead load for the main structures. A light concrete panel from a mixture of news paper powder and white cement as a bonding agent, forms panel through cold pressed process. Papercrete panel and cube are made for sample with size 420 x 420 x 7 mm³ and 50 x 50 x 50 mm³ respectively. The volume ratio of paper - cements mixture were 2, 3, 4, are made of two condition i.e. without admixtures and with 0,2% sugar cane admixtures concentration by cement weight. The research will find out papercrete unit weight, flexural strength panel, cubical compressive strength, modulus of elasticity, water absorption and the price of concrete panel at every cubic and square meter. The result is concrete unit weight ranges from 840 - 933 kg/m³, the highest flexural strength papercrete panel reached at volume ratio of paper - cements mixture 2 with sugar admixture was 8,36 MPa. The highest the compressive strength reached at the volume ratio of paper – cements mixture 2 with sugar cane admixture was 2,48 MPa. The highest modulus of elasticity at the volume ratio of paper - cements mixture 3 with sugar admixture was 6,48 MPa with water absorption still above 50%. that is lower water absorption 56,93% at volume ratio of paper - cements mixture 2 with sugar cane admixture and the highest absorption at volume ratio of paper - cements mixture 4 was 84,23%. While the increasing of paper powder in mixture, concrete unit weight, flexural strenth, compressive strength and modulus of elasticity papercrete becoming lower with the increasing of water absorption. Addition of sugar cane 0,2% by cements weight haves an flexural strength improvement up to 7,66%, and enhanced compressive strength 50,24%, improvement concrete weight equal to 4,71% and reduced adsorption until 10,7%, but in papercrete product with sugar cane admixture doesn't have significant effect of production budget.
ANALISIS GEOMETRIK FASILITAS SISI UDARA BANDAR UDARA INTERNASIONAL LOMBOK (BIL) NUSA TENGGARA BARAT Muttaqin, Aulia; Sartono, Wardhani; Christady, Hary
Civil Engineering Forum Teknik Sipil Vol 19, No 1 (2009): JANUARI 2009
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

The economic growth and local advancement require increasing development of local infrastructure, including the air transportation. Selaparang airport in the Province of West Nusa Tenggara apparently has technical limitations for airside and landside development. Therefore, the local government and PT. Angkasa Pura I have formulated a policy to relocate a new airport with international standard, which is to be known as Lombok International Airport (BIL), to replace the Selaparang airport. Data used for the airport reconstruction analysis consisted of technical facilities required for the airside such as runway, taxiway and apron. The International Coorperation Aviation Organization (ICAO) and Federal Aviation Association (FAA) method were used reffering to Boeing Characteristic Airplane and the apron formulation capacity at peak time based on Japan International Coorperation Agency (JICA). Results of the analysis showed that the the reconstruction Phase I and Phase II of planned Lombok International Airport were classified as 4C and 4E, with 11 and 31 runways, respectively based on the ICAO standard by 2028. These figures were in accordance to the results of windrose analysis on system of up to 95% direction site usability factor. The planned airplanes using the airside facilty on Phase I were B 737-400 and MD 82 and B 747-400 on Phase II. The required length for runway of phase I is 3000 m, 4000 m for phase II, and 45 m runway width using the MTOW value. The taxiway dimension analysis was based on ICAO, FAA and Boeing Characteristic Airplane and resulted in 15 m taxiway for phase I and 23 m phase II. The analysis was divided into three analyses. The required apron dimensions for phase I stage 1 (2006, Phase I stage 2 (2016) and Phase II (2028) are 30.000 m2, 44.000 m2, and 123.520 m2, respectively.
STUDI PENANGANAN BENCANA GEMPA DI BANTUL 27 MEI 2006 Didirianti, Desneri; Kironoto, Bambang Agus; Nurrochmad, Fatchan
Civil Engineering Forum Teknik Sipil Vol 17, No 3 (2007): SEPTEMBER 2007
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

On May 27 th , 2006 at 05:53, 57, a 5,9 Richter scale earthquake occurred. Bantul Regency in Yogyakarta Province was the most severe area. However, existing institutions had limited capability to perform a proper disaster management they also failed to generate the community to participate, especially during the emergency respose period. Therefore, it is required to have an integrated policy for disaster management to meet related parties expectations and to conduct more optimum disaster management. The objective of this study is to obtain best alternatives in handling disaster using the Decission Support System (DSS) eith Analytical Hierarchy Process (AHP) as the method. Three alternatives were analized formatting special office for disaster management (Alternative 1), formatting community based disaster management (Alternative 2), and ascociating the disaster management between interrelated agencies and the local government as the control center (Alternative 3). These alternative were selected based on fuor criterias management, financial, capacity and policy aspect. This study was taken during, the emergency response period performed by SATLAK PBP Bantul. Input for the analysis was questionnaire result given to 120 respondents composing af 30 respondents from bureaucratic element (SATLAK and SATKORLAK PBP members) and 90 respondents from nine villages in three districts. Numeric values were given to each element of the questionnaire result (criterion, sub criterion and alternative). Then, the values were compared to the established comparison scale obtain the lever of interest. Result of this study showed that each criterion of financial, management policy and capacity aspects weighted 0,273, 0,265, and 0,208 respectively. The best alternative of optimum disaster management was alternative 2. The second anf the third were alternative 1 and alternative 3. The community based organizations objective was to improve the people participation in pertaining, preventive, counter measuring and self healing by actively involve in the planning and executing process of disaster management.
BATAKO SEKAM PADI KOMPOSIT MORTAR SEMEN Sumaryanto, Dedy; Satyarno, Iman; Tjokrodimulyo, Kardiyono
Civil Engineering Forum Teknik Sipil Vol 19, No 1 (2009): JANUARI 2009
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

Several previous construction material researches on exploiting rice husk as wall panel (concrete block), showed that rice husk mixed with construction material gave lighter weight but lower strength. This research attempted to improve the strength of the concrete block composite by giving cement mortar mixture as the outer layer. The specimen of concrete block composite was made under the concrete principal method. The first step was to put the concrete block composite and rice husk into a mold in various thickness of required outer layer. Then cement mortar mixture was poured around it as the outer layer. The results showed that the compressive strength of concrete block for various outer layer thickness without cord net ranging from 5 mm, 10 mm, and 15 mm were reached at 1,68 MPa, 5,16 MPa and 6,51 MPa, respectively and per m² wall weight of 102,44 kgs, 122,46 kgs, and 139,10 kgs, respectively. The compressive strength of concrete block with cord net for the same outer layer thickness variation were reached at 1,97 MPa, 5,72 MPa and 6,70 MPa, respectively and per m² wall weight of 120,40 kgs, 135,98 kgs, and 152,23 kgs. Water absorption of outer layer achieved were 2,01% and 7,06% after 10 minutes and 24 hours soaking, respectively. The optimum outer layer thickness without cord net of concrete block composite with rice husk was 10 mm, which met the requirements of minimum compressive strength, light weighted and economic cost aspects.
MITIGASI BENCANA ALIRAN DEBRIS SUNGAI BELANTING SECARA NON STRUKTURAL DESA BELANTING KECAMATAN SAMBELIA KABUPATEN LOMBOK TIMUR – 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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Abstract

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 people’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 people’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.
KAJIAN PENGELOLAAN AIR IRIGASI BENDUNG PIJENAN Umar, Fauzan; Legono, Djoko; Nurrochmad, Fatchan
Civil Engineering Forum Teknik Sipil Vol 17, No 2 (2007): MEI 2007
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

Bantul Regency is about 506.85 km2 consists of 16,440 ha paddy fields and 34,245 ha upland fields. The Pijenan weir is one of weirs located in Bedog river in Bantul Regency. The weir provides irrigation water for Jigutan command area (Pijenan Upstream) of 2.074 ha. Kebonongan command area was previously irrigated from Kamijoro free intake in Progo River. The Kamijoro free intake did not properly function properly due to the sediment deposited in 1969. This condition requires supply taken from Pijenan weir. Irrigation water supply taken to Kebonangan command area can be carried out if irrigation water to Jigutan command area has been optimum. Optimally utilized irrigation water for Jigutan command area is necessary based on the crop pattern and crop variety in order to maximize the farmers’ profit. Based on the restitution of irrigation management policy, farmers free to decide which crop variety will be cultivated in accordance to paddy-paddy-palawija pattern. Paddy as the main crop and palawija (corns, beans, peanuts, onion, and chilly) can be cultivated anytime in order to gain the maximum profit based on the available water in Jigutan command area. The optimization analysis of irrigation water allocation for Jigutan command area was performed using the linear program. Water allocation for Jigutan command area of 100% and 50% of available water resulted in optimum cultivation area of 822.88 ha with profit of Rp 7.688.517.507,00 and 612.88 ha with profit of Rp 6.743.877.335,00. The crop intensity with water allocation of 100% and 50% was 278% (197% paddy and 81% palawija) and 207.05% (114.05 paddy and 93% palawija), respectively. These results described that the optimum area of paddy crop cultivation is significantly sensitive to irrigation water allocation compared to the palawija market price. This explains why the profit obtained by the farmers is dependent from the palawija variety. Results of the optimization of irrigation water allocation of 100% and 50% of the available water to Jigutan command area provides annual supply to Kebonongan command area for 155.233.586 m3 and 75.316.444 m3, respectively.
PEMANFAATAN PASIR PANTAI SEPEMPANG DAN BATU PECAH ASAL RANAI SEBAGAI BAHAN PEMBUATAN BETON NORMAL Siregar, Ahmad Husin; Satyarno, Satyarno; Tjokrodimuljo, Tjokrodimuljo
Civil Engineering Forum Teknik Sipil Vol 18, No 1 (2008): JANUARI 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

Dealing with development in many physical structure and infrastructure sectors, the use of concrete as building component is so wide. Natuna Regency area in manner concrete production always face difficulty in material, crushed aggregate and sand, because this material most of portion was still supplied from outside Natuna Regency that is Tanjung Pinang. In fact local material is quite enough, stone and sand, that wasn’t used optimally. However, the use of material need to be study, this why the research was performed. This study has objective to determine characteristic of nature Sepempang’s sand and Ranai’s crushed aggregate as normally concrete material. This research used material consist of Sepempang’s sand as material, Ranai’s crushed aggregate and Gresik’s Portland cement Type I. Mix design was fixed with water cement ratio (w/c) 0.4; 0.5; 0.6 with slump variable value 6±2 cm and 12±2 cm. Total variation is 6 pieces, each variation 9 pieces cylinder and 3 cube test material. Test result shows Sepempang’s sands have fine sand grading 3.07 fineness modulus (FM), SSD density 2.58; 1.49 of bulk density; 0.44% of clay and other fine material, 242.77 ppm (0.024277%) of salt content and 147.24 ppm (0.014724%) of chloride ion. Ratio fines aggregate-crushed aggregate to concrete mix with slump value 6±2 cm is 35%:65%, and for 12±2 cm slump value is 40%:60%. Ranai’s crushed aggregate has fineness modulus (FM) 7.13; 2.65 of SSD density, 1.52 of bulk density; 1.13% of absorption and 40.94 ppm (0.004094%) of chloride ion. Concrete with water cement ratio (w/c) 0.4 with cement content 475 kg/m3 and 550 kg/m3 respectively, have compressive strength 37.33 MPa and 36.20 MPa, for water cement ratio (w/c) 0.5 with cement content 380 kg/m3 and 450 kg/m3 respectively, have compressive strength 35.51 MPa and 31.68 MPa, and for water cement ratio (w/c) 0.6 with cement content 317 kg/m3 and 375 kg/m3 respectively have compressive strength 27.69 MPa and 26.26 MPa. The result of this research the Modulus of Elasticity of concrete formula E = 4328 f 'c . The ratio of concrete compressive strength 3, 7, and 28 days age was 68%, 87%, and 100%. Generally, the conclusion is Sepempang’s seashore sands and Ranai’s crushed aggregate appropriate as normal concrete material.

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