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Perancangan Dan Analisis Jembatan Rangka Baja Canai Dingin (Cold Formed Steel) Untuk Pejalan Kaki Reza Ermawan; Ismeddiyanto Ismeddiyanto; Ridwan Ridwan
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Cold-formed steel is one of the alternative material that can be used as for truss bridge structures. The high slenderness of cold-formed steel is very prone to buckling (local, distortion, and global) so that the determination of cross-section capacity will be different from hot rolled steel. In Indonesia, cold-formed steel as a structure has been regulated in SNI 7971:2013. According to SNI 7971:2013, there are two methods to determine cross-sectional capacity of cold-formed steel, effective width and direct strength method. The design of a cold-formed steel truss bridge for the loading of class II pedestrians, with a combination of loading from AASHTO LRFD Guide Specification for the Design of Pedestrian Bridge (2009).This research aimed to study the efficiency of truss bridge configurations by comparing bridge weight-displacement ratio of the analyzed bridge truss systems. Bridges were designed in three truss system configurations, Warren, Pratt and Howe. The tension and compression elements, were designed with effective width and direct strength method which were available in CUFSM4 software. The results of the analysis showed that the addition of bridge weight was proportional to the reduction of bridge deflection. Warren truss bridge system produced the smallest ratio of efficiency among the three system, with a value of 5,11, while the Pratt and Howe truss bridge system had the ratio of efficiency of 5,36 and 5,50, respectively. Furthermore, the reduction of the compressive area was also proportional to the slenderness of the element analyzed with effective width method. The cross sections that had high slenderness, failures occured in local buckling. If the cross-section did not experienced global buckling on the elastic buckling curve, the failure occured in the distortion buckling. The direct strength method also produced a higher compressive capacity of 9.33% in profile variations and 8.84% in length variations compared to the effective width method.Keywords : Truss bridge, cold formed steel, truss system, direct stength method, effective widths method.

Pengaruh Natrium Tripolyphospate (Na5p3o10) Terhadap Sifat Mekanik Beton Pada Pengecoran Dalam Air Berlumpur Maharani Rahma Annisya; Ismeddiyanto Ismeddiyanto; Andre Novan
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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In construction work certain conditions where forced by a concrete structure must be moulded directly in water into consideration for casting on location. The condition of casting work in water does not only occur in environments where there is normal water but also in environments that have sludge levels. The use of Tripolyphosphate Sodium is expected to be able to become a mixture in casting concrete in water without conventional compaction so that the concrete mixture is able to flow and solid itself properly. This study examines the effect of Sodium Tripolyphosphate as a constituent in concrete mixes on the mechanical properties of concrete including compressive strength and tensile strength in casting in water, especially in muddy water environments. The study was conducted experimentally with a cement water factor value of 0.37, a percentage of Sodium Tripolyphosphate 10% by weight of cement and a percentage of rock ash 15% by weight of fine aggregate. Concrete compressive strength test was carried out on 6 cylinders 28 days old with a diameter of 10 cm x height 20 cm and for tensile tensile strength testing was also carried out on 6 cylinders 28 days old with a diameter of 15cm x height 30 cm. Based on the results of the compressive strength test of concrete at 28 days, the average compressive strength of concrete for direct castings in normal water is 12,14 MPa, while for the average compressive strength for concrete casted directly in muddy water is 9,49 MPa. So that the compressive strength of concrete, which is cast directly in muddy water has decreased compressive strength by 21.82% of concrete in normal water. For the results of the average split tensile strength of 28 days old concrete, obtained in concrete that is cast directly in ordinary water conditions is 1.37 MPa, while for the average split tensile strength in concrete by direct casting in water conditions muddy at 1.11 MPa. Keywords : Sodium Tripolyphospate, Muddy Water Environment, Compressive Strength, Tensile Strength.

Pengaruh Natrium Tripolyphosphate Terhadap Sifat Fisik Beton Cor Di Dalam Air (Under-Water Concrete) Hasmiyati Hasmiyati; Ismeddiyanto Ismeddiyanto; Iskandar Romey Sitompul
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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In the implemetation of concrete building construction there is a problem when casting in water. To solve this problem, sodium tripolyphosphate use in the concrete mixture. The purpose of using sodium tripolyphosphate is to accelerates the process of concrete hardening in water as well is to increase the binding of fresh concrete material. The alternative to maintain the quality concrete in water filler was needed. The filler used namely stone ash (self compacting concrete). The stone ash is hygroscopic and easy to obtain. The use of stone ash is to increase the viscosity of fresh concrete while reducing the tendency of segregation and bleeding in fresh concrete. The goal of the study is to determine Sodium Tripolyphosphate effect to the physical properties of under water concrete and to obtain the optimum composition of constituents of under water concrete. Sodium Tripolyphosphate which is used in this study is the addition of variations of 5%, 10% and 15% to the weight of cement. While the amount of stone ash used is 10% to the weight of fine aggregate. The slump flow of 5%, 10% and 15% sodium tripolyphosphate is 620 mm, 570 mm and 400 mm, respectively. The volume weight concrete with 5%, 10% and 15% sodium tripolyphosphate are 2274.98 kg/m3, 2312.54 kg/m3 and 2288.14 kg/m3, respectively. Whereas the porosity concrete with 5%, 10% and 15% sodium tripolyphosphate respectively were 23.10%, 21.97% and 22.55%. From the FTIR test results, it is showed that 10% sodium tripolyphosphate is the mixture were more stable compared to other variations.Key words: Sodium tripolyphosphate, under water concrete, stone ash, variation, percentage

Analisis Respons Dinamik Jembatan Rangka Baja Menggunakan Sistem Seismic Isolation Lead Rubber Bearing (LRB) Ari Vera Indra; Reni Suryanita; Ismeddiyanto Ismeddiyanto
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Seismic isolation is system to dampen seismic energy that works on the bridge by add an object called base isolators. The purpose of this study is show the dynamic response of steel truss bridge with stiffness variation LRB (Lead Rubber Bearing) as base isolators and seismic loads. Modeling the structure of the steel truss bridge consists of three spans and two poles. The steel truss bridge model given in the form of data akselerogram seismic load time history. The data is akselerogram Padang Earthquake Malaysia station with variations PGA (Peak Ground Acceleration) of 0.2 g, 0.4 g, 0.6 g and 0.8 g. LRB rigidity is increase to 50%, 100%, 150%, 200%, and 250% of the initial stiffness parameters LRB. The analysis is conduct use dynamic time history analysis. Stiffness value of LRB (Lead Rubber Bearing) base FEMA P-751-2012 and AASHTO Guide Specification for Seismic Isolation Design. Analysis showed The dynamic response displacement and decreased to increase stiffness of LRB but dynamic response acceleration increases.Keywords: Seismic isolation, base isolator, steel truss bridge,, PGA, Peak Ground Acceleration, LRB (Lead Rubber Bearing), dynamic time history analysis,, dynamic response.

Prediksi Tingkat Keruntuhan Kolom Beton Bertulang Akibat Pembebanan Statik Menggunakan Jaringan Saraf Tiruan (JST) Nopember Toni; Reni Suryanita; Ismeddiyanto Ismeddiyanto
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Column failure is one of failure condition in building that most anticipated in civil engineering world, so in designing column required more accurate calculation. One of solution in order to calculating column failure faster and more accurate is using Artificial Neural Network (ANN). ANN imitate how brain working and used to predict column failure. In this research, ANN used to predict reinforced concrete column damage level (DL) thatloaded by static load with variation in: column section dimension, concrete ultimate capacity, longitudinal reinforcement, and steel ultimate capacity. With all variation, total data used in this research is 10962 data. In this research, training and testing composition used is 70:30, hence total data for training data is 7673 data and for testing is 3289 data. Damage level calculated by dividing column strain from finite element software analysis with strain limit from SNI 2847-2013. In this research, column damage level noted as 0 if DL less than 1 and that mean column do not reach failure level, while column damage level noted as 1 if DL more equal than 1 and that mean column reach failure level. Result from testing show that ANN accuracy in predicting damage level reach 98%. This results show ANN can be used for predicting damage level faster and accurate, as well can be used as reference for designing column.Key Words: Artificial Neural Network, ANN, damage level, column, reinforced concrete, static load.

Pengaruh Penggunaan Soil Stabilization Terhadap Sifat Mekanik Beton Dengan Agregat Halus Berkadar Lumpur Tinggi Muhammad Gilang Indra; Ismeddiyanto Ismeddiyanto; Zulfikar Djauhari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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This research was conducted to identify soil stabilization effect on mechanical properties of concrete with high mud content. According to SNI 03-2461-2002 code, the fine aggregate should must contain mud more than 5% of as weight. In this research, soil stabilization of 1% from mud weight was added to concrete mixtures. The percentages of mud added to the concrete mixture in this research were 5%, 10%, 15%, 20% and 23%. A 15x30 cm cylinder is curing in normal water for 28 days to study its compressive strength, tensile strength and elasticity modulus with expectation of 20 MPa in the concrete quality. The result of the research shows an optimum increase in the compressive strength to the concrete with 20% variation mud content. By adding the soil stabilization, compressive strength of the concrete is increased by 30.14% compared to a concrete without the soil stabilization. The value of tensile strength of concrete with 5% variation mud content added soil stabilization lower by 2.60% compared to a variations of a concrete without mud content. The value of the elasticity modulus of concrete with 23% variation mud content added soil stabilization lower by 152.34% compared to a variations of a concrete without mud content. This research concludes that a high mud level concrete with soil stabilization has a higher concrete quality compared to the a high mud level concrete without soil stabilization.Keywords : Compressive strength, tensile strength, elasticity modulus, soil stabilization, mud

Analisis Kuat Lentur Sistem Lantai Curved Tile Semi Pracetak Mustainul Murtadho; Ismeddiyanto Ismeddiyanto; Enno Yuniarko
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Semi-precast slab uses the combination of cast-in-place concrete and precast concrete. The use of conventional firmwirk to buid a building was not support for cinstraction method and it’s very expensive for constraction. Some advantages of precast system are related to its time, cost, predictability, reliability, productivity, health, safety, environment, coordination, innovation, reusability also relocability. The research aimed to analyse flexure behaviour of semi precast curved tile concrete slab using finite element software and its comparison to slices method. The analysis model was done in three element of structure, such as support beam, curved tile and cast in place concrete. The model was made in finite element analysis (FEA) program. Simulation done with two location of point load to get pure bending strength of slab. The result analysis has relation to the effect of load towards element bending, flexural moment and crack scheme on model. From the analysis maximum number of load (P) on semi precast slab system with slices method had higher number compared to finite element analysis (Abaqus). Slices method result had maximum number of Pmaks 56.99 kN, while finite element software method had maximum number of Pmaks 47.6 Kn. On semi precast concrete slab, the type of crack that occurred was flexural crack right on the area of highest number of flexural moment an show the crack pattern in the same direction of stirrups on the tensile side of slab.Keywords: slab, support beam, curved tile, semi-precast, cast-in-place, finite element analysis software.

Pengaruh Penambahan Serat Kulit Bambu Terhadap Sifat Mekanik Beton M Edwar Hidayat; Ismeddiyanto Ismeddiyanto; Alex Kurniawandy
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Concrete has significant deficiencies, which have a low tensile strength. The addition of fiber is one alternative to overcome these deficiecies. Bamboo fiber is a natural fiber that is readily available and relatively fast growth. Fiber which mixing with concrete only take the smooth skin. This research studies the mechanical properties of bamboo fiber concrete consist of compressive strength, splitting tensile strength, flexural strength. Addition of fiber is one of alternation for enhance the strength of concrete. The specimens consists of cylindrical specimens with a diameter of 150 mm and a height of 300 mm and a beam with a length of 600 mm, width 150 mm, and a height of 150 mm. The lenght of fiber that used is 2,5 cm with variation of fiber mass 0,2%, 0,4%, 0,6%, 0,8% 1 % of aggregate fraction.The concrete without fiber is make for comparation. Methods of mixing fibers into the concrete mix in a random way after the concrete is mixed evenly. The result of research showed the compressive strenght, splitng tensile strenght and flexural strength maximum in fiber variation 0,6%. According to the result of research, additional bamboo skin fiber into concrete mixture can improve the mechanical properties of concrete and at optimal fiber variation can on 0.6%.Keywords : fiber concrete, bamboo skin, compressive strenght, splitting tensile strength, flexural strength

Porositas Beton High Volume Fly Ash (Hvfa) Di Air Gambut Ika Qoriah Nursuci; Ismeddiyanto Ismeddiyanto; Monita Olivia
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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This study aims to examine the porosity of concrete with the use of fly ash as a substitute for a large portion of cement (HVFA). Ordinary Portland Cement (OPC) specimen is used as a control of HVFA concrete. The content of pozzolanic material in HVFA concrete is 45% of fly ash. Fly Ash (FA) contained in HVFA concrete in this study had a variation of 50% by weight of cement. After the concrete was released from the mold, OPC and HVFA concrete was cured by soaking it normal water for 28 days. Then, the specimen is was removed and soaked again in peat water for ages 7 and 28 days. When concrete reached their respective ages, porosity testing was carried out on concrete. The results shared that the porosity of OPC immensed in peat water was 17.35% higher than that of immensed in normal water. The increase of porosity on OPC specimen was do the attack of acid contained in peat water which made the specimen became porous and increased its porosity value. On the other hand, HVFA specimen was more resistant to peat water. This was indicated by a decrease in the porosity value of 19.83%. HVFA specimen contained large amounts of FA, the pozzolanic FA makes concrete more resistant to the peat environment and neutralizes the impact of peat on specimen. Keywords: Porosity, fly ash (fly ash), HVFA, peat water.

Kajian Sifat Fisik Beton Dengan Additive Natrium Tripolyphosphate Pada Pengecoran Beton Dalam Air Gambut Wahyu Muhammad Firdaus; Ismeddiyanto Ismeddiyanto; Edy Saputra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Under-Water Concrete (UWC) is one of the types of high-performance concrete because the mixture and the casting process are different from concrete in general. UWC casting does not allow the compaction process to be carried out in the water so by adding Admixtures Washout Agent (AWA) into concrete, the concrete's viscosity is increased and its resistance to washout is enhanced. Sodium Tripolyphosphate (STPP) is one of the additives used in this research which has AWA properties so that when casting is carried out the concrete mixture is not mixed with peat water. The use of a Superplasticizer ensures enough concrete fluidity to spread readily in place without vibration and the use of stone ash functions as a filler for the pores in the concrete. UWC must achieve the right balance between its physical and mechanical properties which can affect its performance. UWC composition and physical properties determine concrete resistance to mass loss by washout of peat water. The research aims to study the effect of STPP additive in the composition of concrete mixtures in the peat water environment and analyze UWC physical properties, i.e., workability, Fourier Transform Infra-Red (FTIR), and porosity. The amount of STPP used in this study is 10% of cement's weight while the amount of stone ash used is 10% of the fine aggregate weight. Porosity and volume weight tests were carried out on six samples, and FT-IR testing was carried out on two samples of the concrete cylinders with volumes of 10 cm diameter and 20 cm height. The parameter considered in this study was comparing the physical properties of UWC of the curing time in peat water for 28 days and 56 days. The test results of the volume weight test on 28 and 56 curing days were 2262.271 kg/m3 and 2271.331 kg/m3. The porosity test value in concrete with 28 days was 20.847% decreased by 0.165% against the concrete age of 56 days, which equals to 20.024%. It can be concluded that there was no effect of peat water at 56 days on concrete's physical properties. Key words: Natrium Tripolyphosphate, Underwater Concrete, Admixture Washout Agent, Porosity

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