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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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PEMANFAATAN BATU “APE“ DARI SUNGAI LUA KABUPATEN KEPULAUAN TALAUD SEBAGAI ALTERNATIF BAHAN BANGUNAN Pongajow, Gerson; 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

Talaud Archipelago Sub-Province is one of the Sub-Provinces in North Sulawesi Province, the growing result of Sangihe and Talaud Archipelago Sub-Province in 2002. This growth followed by the development in all fields, including the infrastructure development which is based stone from outside of the island. This research is done to explore the local potential and also to test laboratory that the local stone can be used as alternative construction materials. In this study, there are 85 stone cube which are used to test it’s strength. Each variant of test is 5 stone and the factor will be given to the stone is the temperature which is 200oC, 400oC, 600oC and 800oC in 15, 30, 60 and 120 minutes. And then follow by checking the rout aggregate nature. Next step is to make concrete which is made by the mix of the aggregate of “Ape” stone and the sand from River Lua Talaud Archipelago and also concrete which is used the mix of the “Ape” stone aggregate and the sand from mount Merapi in Yogjakarta. The result shows that the heat of “Ape” stone can increase the strength of the stone. In the beginning, the strngth is 6,052 MPa., and then maximum increase until 37,43 MPa., after been heated in 400oC temperature for 120 minutes. The aggregate of the“Ape” stone which is been heated includes the lightweight aggregate which can be used directly as an alternative of Red Stone. Concrete as the mix of the “Ape” stone which is heated before, and the sand from Lua River with fas of value 0,5 and 410 kg/m3 cement weight. the weight of ratio concrete 2, 04 kg/dm3 and strength 12, 88 MPa, and also concrete which is mix by the “Ape” stone and the merapi mount sand with fas of value 0,5 and 410 kg/m3 cement weight, the weight of ratio concrete 2,12 kg/dm3 and strength 15,79 MPa. Result, the concrete is the lightweight concrete with the B0 and B1 class. So the conclusion is the “Ape” stone, can be use as an alternative of construction material.
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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Abstract

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 community’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.
FORMULAS1 SISTIM PIPA BERPORI BAWAH TANAH DAN PENERAPANNYA Nasjono, Judi K.; Yuwono, Nur; Triatmadja, Radianta
Civil Engineering Forum Teknik Sipil Vol 17, No 3 (2007): SEPTEMBER 2007
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

One advantage of saline water intrusion phenomena is that saline water may be obtained from shallow well close to coastline. The method is friendly to the environment. Shallow well of depth less than 40 times of ground water height measured from seawater level produce a small amount of saline water. Additional saline intrusion discharge may be obtained by installing seaward horizontal perforated pipe at the bottom of well. Research of seepage discharge trough perforated pipe has been done using physical model with tree variation of pipe diameter. Each pipe was varied in length, perforation diameter, and gap of perforation. They were placed at three various depths under sand surface. To simulate the tidal fluctuation there was four variation of water level. Discharge was obtained from all model combination. The result of the research is a formula that was derived from Darcy formula. The formula could be useful to design. It indicates that there are correlation between depth of pipe burial, pipe length, pipe diameter, head, porosity of pipe and discharge
PENGARUH JUMLAH STASIUN HUJAN TERHADAP KINERJA METODE STORAGE FUNCTION DALAM PENENTUAN DEBIT BANJIR RANCANGAN Hari, Bambang Kuncoro; Jayadi, Rachmad
Civil Engineering Forum Teknik Sipil Vol 19, No 1 (2009): JANUARI 2009
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

Storage Function Method is a method applied in discharge calculation with consideration on catchments characteristics. This method is commonly used in Indonesia by the Japanese experts. The discharge calculation provided by the method is highly influenced by the catchments rainfall, thus the difference of rainfall station number will effect the accuracy of the calculation result. The objective of this study is to investigate the effect of difference in the number of rainfall stations on the value of model parameters as well as the accuracy of discharge calculation using the storage function method on Kali Madiun Basin. Basically, the concept used in the storage function method is a water balance, which is analyzed using the mathematical model. The data used in this research are the 10 days hourly rainfall during the flood, and the catchment characteristics constant as the model parameters. Using the trial procedure, the catchments characteristics constant as the input for each of the numbers of rainfall station (2;3;4;5;6; and 7 stations) will provide the 10 days hourly discharge, then the result will be calibrated to the observed data. Based on the calibration result, the smallest deviation of each rainfall station will be selected in order to identify the model parameter and to provide deviation of the observed data. The investigated deviation is the different value between the calculated and the observed runoff, includes volume deviation as well as the 10 days hourly discharge deviation, which are located at the control node of AWLR Sekayu and AWLR A. Yani. Based on the calibration results, it is shown that the largest volume deviation at AWLR Sekayu is 31.64% that occurs on 2 rainfall stations, while the smallest occurs on 6 rainfall stations with deviation of 17.43%. It is also shown that the largest discharge is 37.29% and occurs on 2 rainfall stations, while the largest and the smallest discharge deviations respectively are 36.7% that occurs on 2 rainfall stations and 26.39% that occurs on 7 rainfall stations. Based on the results, it is shown that although the largest number of rainfall station is not the most accurate, but in general, as shown in the graphical results, it is indicated that more numbers of rainfall stations tend to provide better accuracy.
CANDI PRAMBANAN PASCA GEMPA BUMI Suryolelono, Kabul Basah
Civil Engineering Forum Teknik Sipil Vol 17, No 3 (2007): SEPTEMBER 2007
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

Prambanan Temple area was partially destroyed by Yogyakarta Earthquake on May 27th, 2006. The earthquake caused a lot of parts of temple to break and fall to pieces, but entirely the structure of the temple still stand, although it looks like wrapping. The mystery of Prambanan Temple is interesting to be investigated from geotechnical approach, for structural stability of the temple. The research was conducted by doing field investigation, consisted of boring and soil sampling, combined with geo-electrical and geo-radar investigation inside the area of the temple, for knowing the foundation structure conditions. The available secondary data of physical and mechanical properties of soil were obtained from laboratory investigations. Evaluation was conducted for soil layer and the location of groundwater level beneath the temple. From the observation results, it can be seen that the depth of original soil is of -14,00 m, from the yard of the temple, and bodies of the temple are located white stone (tuff) block of 8,00 m thick. The tuff block layer acts as a foundation. Groundwater level was found at the depth of 11,20 m from the yard of the temple. Under the foundation of the temple, there is a 6,00 m thick of compacted coarse sand layer, acts as a vibration energy damper.  
BATAKO STYROFOAM KOMPOSIT MORTAR SEMEN Wancik, Ahmad; 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

Research in construction material by exploiting styrofoam as lightweight concrete, gives result that a construction material will have a lighter weight if it is mixed with styrofoam, and achieve a lower strength. This research were try to improve the strength of styrofoam concrete block composite by giving cement mortar mixture as an outer layer. The specimen of concrete block composite will be made with concrete method of preplaced concrete, where initially by putting down the concrete block composite with styrofoam into a mold according to various thickness of outer layer required, and mortar mixture as outer layer around it. It was found that the compressive strength of concrete block with various outer layer thickness of 5, 10, and 15 mm without cord net were reached at 2.52 MPa, 5.44 MPa and 7.49 Mpa respectively with weight per piece were 7.60 kgs, 9.06 kgs, and 10.23 kgs. The compressive strength of concrete block with cord net size 100 mm² were reached 3.27 MPa, 5.75 MPa and 8.58 MPa respectively with same various outer layer thickness and weigh per piece reached at 8.06 kgs, 9.15 kgs, and 10.28 kgs. Water absorption of outer layer were achieved 2,01 % and 7,06 % for soaking during 10 minutes and 24 hours respectively. Generally, the composite styrofoam concrete block with cement mortar outer layer thickness of 5 mm, 10 mm and 15 mm has meet a clauses of SNI requirements to solid concrete block for concrete block quality IV, quality III and quality II.
PENILAIAN KONDISI JEMBATAN DENGAN METODE NYSDOT (STUDI KASUS 3 JEMBATAN DI KOTA KENDARI) Marsuki M., Marsuki M.; Triwiyono, Andreas; 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

Bridge plays a vital role in supporting life activity. A lot of bridges are required due to many watercourses running from mountain that also requires a lot of amount in the budget. Neglecting such problem may lead to traffic disturbance and discomfort. The purpose of this research is to assess the bridge condition and its components, to compose the handling priority program and the bridge component priority. The research was located in Kendari of the Province of Sulawesi Tenggara. Located above Kendari Bay, a crowd economic area, Kendari has the important downtown access road. NYSDOT (New York State Department of Transportation) Method and completed with AHP (Analytical Hierarchy Process) method were used to assess the bridge condition. The bridge component scoring was calculated using the AHP method. The calculated components were compiled using the matrix of paired-comparison by referring the importance value. The, bridge component scoring consisted of three categories: (a) first category: the structural component received direct traffic load (component distributing traffic load), which was given the first priority where the importance value was higher, (b). Second category: the structural component received indirect traffic load, (c). Third category: non structural component. Calculation method AHP for every bridge component was obtained through paired-comparison. Components with bad value were found in Pasar Baru Bridge, which was rated 3 for its extension component, paving surfaces, pavement and curb. The subsequent ones were the Tripping bridge, which was rated 4 for its extension joint component and Kadia bridge which was rated 5 on its main beam, abutment, deck and back wall. Both, NYSDOT and AHP methods resulted in same assessment figures. The proposed priority handlings in subsequent order for the three bridges were Pasar Baru Bridge, Kadia Bridge and Tripping Bridge. The condition indexes were 4,514 (Average), 5,722 (Good) and 6,083 (Very Good), respectively. The proposed handlings for Pasar Baru and Kadia bridge were rehabilitation and maintenance.
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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Abstract

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.
PEMANFAATAN KULIT ALE-ALE SEBAGAI AGREGAT KASAR DALAM PEMBUATAN BETON Suratmin, Suratmin; Satyarno, Iman; Tjokrodimuljo, Kardiyono
Civil Engineering Forum Teknik Sipil Vol 17, No 2 (2007): MEI 2007
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

At present cockle shells of ale-ale are used only as materials of heaping up muddy yards or roads in Ketapang City. Therefore, it is a challange to conduct study to utilize cockle shells of aleale as aggregate for concrete. It is expected that the result of this study can not only give additional economicall value for cockle shells of ale-ale, but also reduce impacts on environment. In the present research, intact and broken cockle shells were used as concrete aggregate mixed with white sand, and white Portland cement. The amount of cement used is 300 kg/m3. The composition of both intact and broken cockle shells of applied in the research was 100%, 75%, 25%, and 0%. The specimen of intact cockle shells ale – ale was made in various shape and size namely sylinder-shaped models of ∅150 x 300 mm and ∅80 x 160 mm and a ‘concrete brick’-shaped model, while specimen broken cockle shells of ale-ale were sylinder-shaped models of ∅150 x 300 mm and ∅80 x 160 mm, a cube-shaped model of 70 x 70 x 70 mm and a ‘paving block’- shaped model. The research aims at finding the compressive strength of 28 days old, abration of concrete, and impact resistance of concrete. From the result of the research, it can be identified that the specific gravity of concrete with intact and broken cockle shells of ale-ale with the variation of 50% corresponds to a ‘normal concrete’ category. While specific gravity the intact cockle shells with variation of 50% is 2367.82, the broken cockle shells with the variation of 50% is 2302,66. Based on the result, it can also seen that with the variation of 50%, the highest compressive strength of concrete in the mixture of intact cockle shells of ale-ale is 24.98 MPa, and for broken cockle shells of ale-ale is 27.53 MPa.
EVALUASI KINERJA DAN PERKUATAN STRUKTUR GEDUNG GUNA ALIH FUNGSI BANGUNAN (Studi Kasus : Perubahan Fungsi Ruang Kelas Menjadi Ruang Perpustakaan Pada Lantai II Gedung G Universitas Semarang) Christiawan, Ignatius; Triwiyono, Andreas; Christady, Hary
Civil Engineering Forum Teknik Sipil Vol 18, No 1 (2008): JANUARI 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

To meet the need for good infrastructure of building construction, building new one is not theonly appropriate choice. Efficiency resulted from the functional substitution of existing building to be used with a new function can be a more precise alternative. The existing functional substitutio will result in the change of the building load. Based on the fact, it is necessary to evaluate the performance and the strength of structure at the existing condition to take new load and to calculate the strengthening required. The study is conducted on Building G of Campus III, Semarang University at Jl.Soekarno- Hatta, Semarang. A lecturing space in floor II was proposed to be functionally substituted into library room. It focuses on evaluating performance of structure, the strength of plate, beam, and column, and the bearing of foundation, existing condition based on SNI-2847-2002, earthquake load application based on SNI-1726-2002, and promoting a proposal for strengthening the structure required. The SAP 2000 is used to analyze the structure to gain the required strength value of U (ultimate). BETON 2000 is used to analyze the structure of existing condition to gain the existing strength value of R (resistance). The strengthening of the plate and beam is conducted by adding the Fiber Reinforced Polymer (FRP), while that of column is by adding an external reinforcement The result of the study indicates that the existing fc’ is 17 MPa and the fy is 390 MPa. From evaluation on the performance of structure, it can be known that the performance of servicing limit and that of ultimate limit of the building have really met the requirement of SNI-1726-2002. Based on the result of analysis on the structure of plates in floor 2, plates of A, C, E, and H need the strengthening of flexure ability. Beam in floor 2 : 1 A-E ; 1 E-I ; 2 A-E ; 2 E-I ; 3 C-E and ring beam : 0 A-C ; 0 C-E ; 0 E-G ; 0 G-I ; 3 C-E ; 3 E-I require the strengthening of flexure ability and shear ability. The strengthening of flexure and shear abilities by adding the FRP is found to be able to add the flexure and shearing abilities of plates and beam. The result of analysis on the strengthening of flexure ability by adding reinforcement shows that it can add the flexure ability of column. And form analysis on foundation, it can be known that foundation is able to bear new load so it does not require the strengthening.

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