Journal Inersia, Jurnal Teknik Sipil-
Inersia, Jurnal Teknik Sipil, Volume 11, pp 34-40; doi:10.33369/ijts.11.2.34-40
Noise on a road is caused by the sound of a vehicle engine which is passing on. It can make the environment uncomfortable and the health problems in humans. The distance between the object and the sound source determines the magnitude of this impact. This study aims to look for the effect of the distance on noise levels that caused by vehicle engine sounds. The study was conducted in the central of Bengkulu City, Jalan Suprapto. Observations were made in 2 segments of Suprapto Road with 10 m distance intervals perpendicular to the sound source with a total of 5 points. The mathematical model uses the linear regression equation approach. Distance is an independent variable and noise is an independent variable. The results showed that, the relationship between the distance of the observation point and the noise value obtained equation Y = -0,317x+71,20 with R2 = 0,984.Keywords: noise, distortion, regression.
Inersia, Jurnal Teknik Sipil, Volume 11; doi:10.33369/ijts.11.2.17-24
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Inersia, Jurnal Teknik Sipil, Volume 11, pp 12-16; doi:10.33369/ijts.11.2.12-16
Portland cement is a relatively expensive type of cement when used on constructions requiring simple requirements. Local material utilization using ash fragments of coral reefs and rice husk ash is one of the solutions. The objectives of this study is to determine the value of concrete compressive strength in each variation of cement replacement used were 2.5%, 5%, 7.5% and 10%, each variation consists of 70% ash fragment of coral reefs and 30% rice husk ash from the volume of cement used. The cube specimen with a size of (15x15x15) cm as many as 20 specimen were prepared. Concrete mixture according to SNI 03-2834-2000 used 0.5 cement water ratio and 60-100 mm of slump. The result of the compressive strength of concrete variation every percentage increase has increased and decreased from the result of the normal concrete compressive strength of 368.24 kg/cm2. Maximum increase occurred in the concrete compressive strength variation 7.5% of 384.76 kg/cm2 and decreased on the concrete compressive strength variation 10% of 367.40 kg/cm2.
Inersia, Jurnal Teknik Sipil, Volume 11, pp 1-11; doi:10.33369/ijts.11.2.1-11
Pantai Kota Padang had a breakwater (groin) which serves to withstand sedimentation transport, but building has been damaged and deformed. The purpose of this study was to analyze the building of form I groin using dolos material at Pantai Kota Padang. The method of conducting research primary data processing method used in field direct namely collection (Hs and Ts), while secondary data analysis method using wind data, and analysis data tides. Secondary data in this in this research is the wind data taken for ten years (2009 - 2018) obtained from the Badan Meteorologi Klimatologi dan Geofisika (BMKG) Maritim Teluk Bayur and the tides data taken during the last 5 years (2014-2018) whom obtained from PT. Pelabuhan Indonesia II Teluk Bayur. Results of the groin dolos have 60,803 m in length, 2,20 m on water level, 4,875 m elevation lighthouse and 8,875 m elevation of building, peak width of 1,433 m on the arms building. Weight unit protective cover dolos groin arms are W=0,261 tons, W/10=21,6 kg, W/200=1,3 kg, and amount each layer is 5 m2 as many as 16 pieces for the arms building.Keywords: Breakwater, Groin, Dolos
Inersia, Jurnal Teknik Sipil, Volume 11, pp 41-51; doi:10.33369/ijts.11.2.41-51
This study is designed to model the tendency of Gedung PKM users, Universitas Bengkulu using Agent Based Modelling Method. The vehicle survey is performed to obtain the peak-time period of parked vehicles in Gedung PKM. The questionnaire collecting is performed to obtain the information, which are later used to volume capacity ratio, volume, and road capacity. In this study, several road segments and alternative routes are observed during the evacuation. To inspect the suitability between the modelling and the observation, the simple linear regression analysis is performed. The results show that the most selected route is the shortest route with the best accessibility to reach the gateway, during the evacuation. The road saturation degree shows that there is a need to improve the local road performance in Universitas Bengkulu to ensure a faster evacuation process during tsunami.
Inersia, Jurnal Teknik Sipil, Volume 11, pp 25-33; doi:10.33369/ijts.11.2.25-33
This study modeled the movement of tsunami refugees at Gedung Kuliah Bersama V University of Bengkulu with an agent based modeling method. The questionnaire was conducted to find out the modes of transportation used, then processed by finding the saturation of degree, volume, road capacity, speed and travel time. This study compares the daily movement and time of evacuation, then a simple linear regression analysis is carried out. There are several road segments and alternative routes that were reviewed in this study. The results showed that the route chosen by respondents during evacuation was the shortest route to the exit gate. The saturation of degree obtained was still in the stable category. However, there is a necessary to develop the performance of university of bengkulu road networks which can enjure the better evacuation process.
Inersia, Jurnal Teknik Sipil, Volume 11, pp 27-32; doi:10.33369/ijts.11.1.27-32
Eggshell powder is obtained from crushed dried eggshell waste. Egg shells contain 97% calcium carbonate. The large calcium content has the potential to be used in cement. This study aims to determine the compressive strength and absorption of mortar by adding 2,5% to 15% eggshell powder with a range of 2,5%. The method of manufacture and test compressive strength and absorption of the mortar refers to SNI 03-6825-2002 and SNI 15-2049-2004. The total of mortar cubes are 84 pieces with dimensions 50 mm. Each variation has 8 mortar cubes for compressive strength and 4 mortar cubes for absorption. The range of initial flow values used are 105%-115%. Mortar cubes soaked for 26 days and test of mortar conducted at 28 days. The highest value of mortar compressive strength occurred in addition 12,5% eggshell powder (13,49 Mpa) with increased percentage of 22,04% from the normal mortar. The smallest value of mortar absorption occurred in addition 12,5% eggshell powder (8,76%).
Inersia, Jurnal Teknik Sipil, Volume 11, pp 19-26; doi:10.33369/ijts.11.1.19-26
Installation of the pipe in the column (conduit) such as electrical and sanitary plumbing installations are found in the structure of reinforced concrete columns. This causes it to be a hollow column. The existence of holes cause a reduction in cross sectional area of the column and can result in reduced strength of a column. The purpose of this study was to know the power difference hollow concrete columns with concrete columns are not hollow and produce an analysis of the interaction in the form graphics axial force (Pn) and nominal torque (Mn). The analytical method developed by using square column spread sheet applications and use the stress-strain relationship hognestad. Analysis of the hollow square column in this study as many as 720 samples. This study used 300x300-600x600 mm dimensions with an increase of 100 mm. Quality concrete (f'c) used was 25-30 MPa to 2.5 MPa rise. Quality reinforcement (fy) used was 400 MPa and the ratio of the reinforcement taken from 1% -8% with an increase of 2% of the cross sectional area of the column, with the amount of reinforcement as much as 12-20 pieces of reinforcement to rise 4 pieces. Widely used hole that is 3% -7%, with an increase of 1%. The analysis showed a decrease in Pn-Mn hollow column to column was not perforated. The decrease Pn maximum of 7.20% in the area of hole 7% by eccentricity to d amounting to 8.01% and the maximum Mn decrease of 10.91% in the area of hole 7% by eccentricity to d amounting to 20.51%.
Inersia, Jurnal Teknik Sipil, Volume 11, pp 1-6; doi:10.33369/ijts.11.1.1-6
Concrete is a material that have the strength to compression, but it is weak against tensile strength. The weakness of the tensile strength of concrete can be minimized by adding pandanus tectorius fiber. This study was aimed to determine the effect of adding pandanus tectorius fiber to split- tensile strength of concrete and percentage of the fiber in concrete that shows the highest split- tensile strength. The specimens used in this study is cylindrical with dimensions of 30 cm in height and 15 cm in diameter (SNI 03-4810-1998). Total of specimens is 32 that consist of 8 normal concretes and 24 variation concretes. An addition of pandanus tectorius fiber with the variation of 0,25%, 0,5%, and 0,75% was based on volume of the specimen. The mix design of concrete used water-cement ratio of 0.5 and slump of 60-100 mm. The splittensile strength of concrete was tested at 7 days and 14 days of dryng after immersing for 27 days. The result of split-tensile strength test of concrete with a variation of pandanus tectorius fiber showed a decreasing. The decreasing of split-tensile strength of concrete at 41 days was smaller than at 34 days to normal concrete. The highest decreasing percentage of split-tensile strength of variation concrete to normal concrete was respectively 9,249% (variation 0,25 tested at 41 days) and 14,518% (variation 0,75% tested at 34 days) .
Inersia, Jurnal Teknik Sipil, Volume 11, pp 13-18; doi:10.33369/ijts.11.1.13-18
Bagasse ash and stone ash are materials that have some elements that fimilar to cement elements. Bagasse ash is a waste that has not been utilized by community. Stone ash is a waste of stone crusher whose utilization in building structures is still lacking. This research was aimed to know compressive strength of the mortar which use bagasse ash and stone ash as a partial substitute of cement. The method of casting and compressive strength test of the mortar referred to SNI 03-6825-2002. The total of mortar cubes was 128 specimens with dimensions of 50 mm x 50 mm x 50 mm. Variations of bagasse ash and stone ash used were 5%, 10%, 15%, 20% and 25% of the weight of cement. The range of initial flow values used are 105%-115% (SNI 03-6882-2002). Mortar cubes cured for 27 days and test of mortar was conducted at 28th days. The value of mortar compressive strength variation of bagasse ash decrease from normal mortar compressive strength with a decrease respectively of 0.62%, 2.14%, 7.33%, 7.50% dan 9.53%. Compressive strengths of mortar with stone ash is increases from normal mortar in variations 5%, 10% and 15% with the percentages of 4.66%, 3.41% and 2.38% respectively, while in the variation of 20% and 25% is decreases. Compressive strength of mortar with mixture bagasse ash and stone ash reduce from normal mortar with a decrease of 0.08%, 1.04%, 5.67%, 8.06% dan 15.12% respectively.