JOURNAL TEKNIK SIPIL DAN INFRASTRUKTUR
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Kajian Daya Dukung Tanah Gambut dengan Perkuatan Geotekstil dan Perubahan Muka Air Tanah
Full text linkPeat soils have a high compressibily and low bearing capacity. This unfavourable characteristic might cause differential settlement dan failure of the construction, so that the appropriate improvement method is required to overcome this problem.Peat soil improvement method that commonly used is mechanically dan chemically soil improvement method. In this research, the peat soil reinforced with geotextile was conducted in order to find its influence in increasing the bearing capacity.Also, peat land are generally located in the area with shallow water level. In this research shallow foundation reinforced with geotextile with variations ground water level was conducted to determine its effect in improving the bearing capacity. The variation of layer number of reinforcement (N) used was N= 3, with width 2B reinforcement, where the variations of ground water level are z = 0 cm, z = 5 cm and z = 10 cm where B is foundation width and z are the distance of the ground water level from base of the foundation. Result of modeling in the laboratory shows that the insertion of geotextile material in the peat soil can increase its soil bearing capacity. The increasing of ultimate bearing capacity (qu) tends to be higher for reinforced soil with no ground water level compared to soil with ground water level.The closer ground water level to foundation base the smaller the bearing capacity either with or without reinforcement. The highest value of bearing capacity was obtained in reinforced peat soil with no water level that is 8,6 kN/m2 or the it increase as much of 178,1% compared to unreinforced peat soil with no water level. Bearing capacity ratio (BCR) has also increase as of as 2,78 in with the reinforcement without water level compared to condition without reinforcement and without water level
Model Numerik Pengaruh Koefisien Kekasaran Manning Terhadap Kenaikan Muka Air di Teluk Palu
Full text linkManning roughness coefficient (n) is one of the parameters affecting the drainage conditions, such as speed and water level. These coefficients, in its natural state vary based on the size, shape and type of material. This study aims to look at the influence of changes in flow conditions due to the use of the Manning coefficient varied by using numerical models RMA2. This module is one of the open channel flow modeling module contained in software Surfacewater Modeling System8.1. Performed numerical models in SMS8.1, the bathymetry of the river and bay as the input geometry, the average discharge as upstream inputs and yearly tidal average as well as simulating the input down stream flow with variation value of n. Based on the simulation results of SMS8.1, changes in water level gradually decrease from the basin to the estuary and ocean regions. Variation of the value of n to the water level did not change significantly due to any increase in the value of n 0.0050.00002 to 0.00006 m water level in the estuary. Flow velocity in the river is relatively large and gradually tapers to the estuaries and the sea. Variation of the value of n tends to flow velocity did not change significantly due to any increase inflow velocity of 0.005 n value changed from 0.0002 to 0.0008m /s at the estuary
Analisis Peramalan Ketinggian Gelombang Laut Dengan Periode Ulang Menggunakan Metode Distribusi Weibull (Studi Kasus Pantai Lembasada Kabupaten Donggala)
Full text linkLembasada Beach, Donggala regency is the oldest port in central Sulawesi province which the region has a long coastal area that is 400 km. Most of community events in Donggala regency are located in coastal areas. There are several coastal areas in Donggala that potentially damaged by abrasion, one of which is Lembasada Beach. The effect of the frequent occurrence of erosion and abrasion, buildings and areas around the Beach were damaged by large waves and brunt of the waves could get to the land when there is high tide. The aim of this writing is to determine the height of a wave that will be used in planning the coastal protection building. Measurement of wave height is very rare and hard to achieve therefore in this writing the forecasting of wave heights were conducted through modification of wind speed data for 8 years (2006 – 2013) using the Weibull DistributionMethod based on the Return Period. The data used is secondary data obtained from an extract of the NOAA Earth System Writing Laboratory NCEP/NCAR and processed using WRPLOT then get the maximum wind direction. Based on the result of analysis, it was obtained that the significant wave height and a significant maximum wave period in 2007 on the southwest directon is (Hs) = 0,7969m and (T) = 2,6942 seconds. After analyzing the frequency distribution using Weibull method it can be predicted the wave return period occurence, the return period of 2 years =0,208 m, 5 years = 0,213 m, 10 years = 0,218 m, 25 years = 0,225 m, 50 years = 0,230 m, and 100 years = 0,236 m
PENGENDALIAN MATERIAL SISA (WASTE MATERIAL) (STUDI KASUS PEMBANGUNAN GEDUNG KANTOR PERPUSTAKAAN, ARSIP DAN DOKUMENTASI KABUPATEN SIGI)
Full text linkIn the process of building construction residual materials usually formed that can be disadvantageous for the work parties.There are several ways to reduce the occurrence of waste material. The purpose of this research is to know how to control the waste material in case study of library office, archive and documentation buildings of Sigi Regency. The data were obtained by distributing questionnaires to the job implementers as well as taking documentation in the field. Data processing were using likert scale method, descriptive analysis, photograph analysis and SPSS software to determine the reliability of a data and correlation using Spearman's Rho method. The results of this research indicate the control of residual materials carried out by taking into account: (a) the security of material storage, (b) the storage of materials according to the type and nature of the material, (c) plotting and calculating material use, (d) the worker's occupational control, (e) the presence of an officer inspecting and recording the material accepted and material that have been used, (f) casting and plastering in accordance with predetermined requirements, (g) the officer recognizing the material type and knowing the material allocation issue, (h) Packaging and control on transporting materials, (i) storage location can facilitate the distribution of materials to job sites
Pengaruh Kecuraman Gelombang Bangunan Bawah Air Geotube Terhadap Profil Pantai Pasir Buatan
Full text linkBeach damage is a serious problem which requires prompt action from the government. Adding more sediment to the beach (beach nourishment) is one of the efforts to cope with the problem. However, the sediment filled is usually carried away by the wave, which consequently brings maintenance costs for dealing with the sandpile during certain periods, as well as the need for large volume of excavation. One of the alternatives to reduce the loss of the sediment pile is by constructing off-shore submerged structure with the crest of the structure is set submerged and made from geotube. The objective of this study was to identify the influence of wave steepness to the beach profile formed behind the structure. The physical model test was carried out to the sand of Tanjung Ann beach (d50=1.47 mm) under two conditions: without the submerged structure and with the geotube submerged structure within wave period (1; 1.2; 1.4; 1.6; and 1.8 second), wave height (6,7,8,9,10,12,14, and 16 cm). The laboratory scale (small scale) was used. Model was placed in the wave channel with initial profile slope of 1:6 and was subject to constant regular wave until the beach profile balance was achieved. Results of this study showed that the beach profile slope was formed behind the geotube submerged structure and grouped into two zones: the swash zone and the breaking zone. The swash zone was where the highest run up and the lowest run down occurred and the breaking zone is where the Dean’s formula applied. The influence of wave steepness (increasing Ho/Lo) was the increasing setback of the beach profile behind the geotube submerged structure. It would give benefit when the H0/L0 ≤ 0.068 for constant structure height
Analisis Variasi Suhu Pencampuran Terhadap Durabilitas Asphaltic Concrete-Wearing Course (AC-WC ASB H)
Full text linkAsbuton is a natural asphalt found in Buton Island, South-East Sulawesi with preservation approximately 210 million tonnes particularly found in Lawele area. Warm Mixing Asbuton usually uses temperature of 120°C - 125°C in Special Specification Warm Mixing of Asbuton. In mixing, temperature is one of the most important factors in the construction of road work and it also influences the characteristics of the mixture that are the durability and rut resistance. This study aims to understand the influence of temperature variation of Asbuton warm mixing against ACWC mixing durability and the best durability of some mixing temperature variations. The temperature variation used in mixing and compaction are 105ºC and 95ºC, 115ºC and 105ºC, 125ºC and 115ºC. This study were using Asbuton Butir T 15/25 Ex. Bina Prima Indonesia (BPI), with fluxing materials, which is mixtures from asphalt penetration 60.70 and solar Ex.Pertamina with materials taken from Stone Crusher Ex.Taipa River. The research were utilyzes Marshall Test to obtain the characteristic of mixing, referring to SNI and Bina Marga. The result showed that durability is highly influenced by temperature variation of mixing and compacting. Mixing temperature of 105°C and compaction of 95°C are not recommended because the mixing durability does not meet the specification. On the other hand the highest temperature is resulting in mixing durability that still meet the good specifications
PEMANFAATAN CAMPURAN MORTAR DAN PARTIKEL KAYU SEBAGAI ELEMEN INTI BALOK BETON KOMPOSIT
Full text linkLightweight concrete has ability to increase workability and reduce structure load such as gravity and earthquake loads. Therefore lightweight and adequately rigid structural system is required. Based on efficiency of material application and adaptation optimization to the stress distribution system, composite system become one alternative that can be utilize, especially on beam structure. In this case, collaboration between lightweight concrete and ordinary concrete will be the deciding factor to achieve the objectives mentioned above. To construct lightweight concrete, timber particles obtained from sawmill industrial waste with density of 0,35 – 0.65 gr/cm3 will be highly possibly to utilize. This research aims to obtain the composition of concrete and timber particles mix that its strength can be measured in order to get effective composite concrete beam. A number of tests to the mix of concrete and timber particles were conducted to find out its pressure strength, tensile strength and elasticity, in order to get the percentage of timber particles used in concrete that will be used to create composite concrete with ordinary concrete. Sawmill and furniture industrial waste in form of timber particles can be utilized as material to create lightweight concrete which was limited only to nonstructural element. Keyword : Normal/Ordinary concrete,mortar concrete ,coconut timber particle
PENGARUH LUBANG DAN EKSENTRISITAS TERHADAP KUAT TEKAN BETON
Full text linkThe use of hollow concrete in buildings is allowed. It is accordingly to SNI 03-2847-2002, which mentioned that pipeline with its holes that are embedded in column should not occupy more than 4% of cross-section area of the column. The use of holes in the column is used for plumbing or electrical installations. Reduction of cross-sectional area of concrete causes the concrete strength to bear axial load will also be reduced. Besides that, in the installation of pipes in a column, they could be in inclined position, which could result in an eccentricity to the gravity centre of column. Based on the problem, this research aims to find out the effect of eccentricity on the concrete column with hole to its strength in supporting axial load. There were 56 cylindrical specimens with 15 cm of diameter and 30 cm of high used in this research. The results showed that the hole in concrete resulted in reducing of the compressive strength of concrete. The reducing in strength is expected to be due to reducing in cross-section area of concrete. The use of holes up to 3.8% of the concrete cross-section area results in reducing the strength of concrete up to 16.86% (BN2) of the strength of concrete without holes. The reduction in strength due to the holes eccentricity of 2 and 3 cm to the eccentricity of concrete, were 24.64 and 25.36% respectively to the concrete strength without hole. Then the strength of concrete at 3.8% aperture area still meets the requirements. Based on that also why the hole bounded by SNI 03-2847-2002, pasal 8.3 (4) can still be used by 4%. Keywords: concrete, eccentricity, hole, compressive strength
DESAIN FONDASI TELAPAK DENGAN MENGGUNAKAN BETON STYROFOAM RINGAN PADA TANAH LEMPUNG BERPASIR
Full text linkRecently, the price of construction material has gone up especially price of cement as the primary material for foundation construction. In the area which is consist of soft soil with higher water level, a higher foundation section area such as plate foundation or pile foundation is needed. It will be costly when pile foundation or plate foundation utilized in lightweight building. Therefore, lightweight concrete foundation might be useful as an alternative to reduce cement volume in concrete material which will reduce the cost of foundation construction. The research aims to determine the optimum percentage of lightweight Styrofoam concrete in plate foundation against bearing capacity, settlement, and uplift force in sandy clay. Foundation were made of concrete mixed with Styrofoam with contents varied as 0%, 20%, 40%, 60% 80% and 100%, then its pressure strength and volume weight at 28 days cure were tested. From physical properties tests such as sieve analysis and Atterberg limit test, the soil classified as CL or anorganic clay with low to medium plasticity, sandy clay with A(activity) of 0.87 which means it has illite clay mineral content in the soil with activity (A) medium. Direct shear test shows that the soil have a friction angle (f) 24,25° and cohesion (c) 0,0197 kg/cm. Concrete unit weight containing no Styrofoam is 2,222 gr/cm3. Average concrete unit weight will be reduced as 0,2726 gr/cm or 12% for each addition of 20% of Styrofoam. The percentage of concrete pressure strength reduction by addition of Styrofoam of 10%, 20%, 30%, and 40% compare to concrete pressure strength with no Styrofoam added are 24,470%, 44,453 %, 58,601 %, and 69,145 % respectively Reduction of concrete pressure strength are due to Styrofoam particles that may act as air void, in which concrete with air void has lower pressure strength compare to concrete without air void. Kata Kunci : Plate Foundations, Lightweight Styrofoam Concrete, Sandy Cla
PEMODELAN BANGKITAN PERGERAKAN PADA PERUMAHAN CITRA PESONA INDAH DAN PERUMAHAN METRO PALU REGENCY DI KOTA PALU
Full text linkConstruction of residential area in Palu city increases along with the city development and population growth. It can raise or enlarge the trip generation both for medium residential (subsidized residential) and for middle to upper residential (the elite residential) and also affect the use of land as well as increased traffic. The purpose of this thesis is to determine the factors of affect trip generation and make the trip generation models at residential of Citra Pesona Indah and Metro Palu Regency. This research was conducted by studying literature that can support this research, gathering data using sampling techniques (stratified random sampling) with the formula of Slovin, conducting interviews and questionnaires to the respondents, analyzing the data results of the interview to describe the characteristics of the residence occupants and analyzing with the categories that will result in trip generation number on the residential area. The number of trip generation obtained by conducting interviews through questionnaires was 1665 movements / day for Citra Pesona Indah and 222 movements / day for Metro Palu Regency. The number of trip generation resulted using category analysis method is 1669.4 movement / day for Citra Pesona Indah and 222.4 movements / day for Metro Palu RegencyKeywords : Trip generation, category analysis, sampling technique