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Kurdian Suprapto
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THE EFFECT OF ADDITION OF FIBER REINFORCED ON CONCRETE WITH PLAIN AND DEFORM REBAR Kurdian Suprapto
Journal of Civil Engineering Vol. 30 No. 1 (2010)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v30i1.7530

Abstract

In reinforced concrete structures, the interaction between concrete and steel bar are depend on its bonding strength. This study presents the behavior of bond-slip on fiber reinforced concrete with 10 mm plain rebar and deforms rebar. The concrete specimen is using 1% fiber reinforced. Furthermore the specimen is also compared with concrete without fiber reinforcement. The behavior that observed in this study is the effect concrete compressive strength, type of rebar, amount of rebar, and concrete cover due to bonding strength. The analysis results also compared between pull out method and semi beam method with and without fiber reinforcement. The analysis results shows the compressive strength, tensile strength, bonding strength, and bond stress of fiber reinforced concrete increase around 13.255%, 48.70%, 10.43% and 10.53%, respectively. Moreover, the deform rebar has better bonding strength compared to the plain rebar, which increase around 175% - 185%. Furthermore, for the group reinforcement, which is the spacing between rebar is 2.5 cm, is also effected the bond stress. The more amount of rebar will reduce the bond stress around 46.82% - 64.71%. In addition, the more thickness of concrete cover will also increase the bond stress.
ANALYTICAL STUDY ON THE EFFECT OF CONFINEMENT OF R.C. CIRCULAR COLUMN TO THE VALUE OF CURVATURE DUCTLING Kurdian Suprapto; Tavio Tavio; Yanuar Siscaria Rahmawati
Journal of Civil Engineering Vol. 30 No. 2 (2010)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v30i2.7534

Abstract

Construction technology has been rapidly developing nowadays which often requires the use of higher ductility of structural elements. All structural members, especially columns as primary structural components should have higher ductility so that it can delay the collapse of the buildings during earthquake. There is a significant difference in behavior between unconfined and confined concrete columns. Confined concrete columns show higher ductility compared with those unconfined. To accommodate the analysis, a computer program called MoCurv v.1.2 is developed. This program is an improvement of the earlier developed program called MoCurv v.1. This program can be used to analyze circular column sections with NSC and HSC. Five major factors are dominantly control the value of curvature ductility, i.e. transverse reinforcement spacing, number and size of longitudinal bars, strength of concrete, column size, and axial loading. Parametric study has also been done to compare the effectiveness of each parameter. It can be concluded that the most influencing parameter to the value of curvature ductility is the spacing of transverse reinforcement.
PHYSICAL AND MECHANICAL PROPERTIES LIGHTWEIGHT CONCRETE AND THE USE STYROFOAM SILICA SAND Kurdian Suprapto; Mudji Irmawan; Fauzi Rahman
Journal of Civil Engineering Vol. 31 No. 1 (2011)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v31i1.7585

Abstract

The research is motivated rationale for reuse styrofoam waste (wrappers monitor) that is widely available on the ground that this cannot be destroyed or recycled. Utilization of waste is intended to not pollute the environment and can even be commercially valuable. In addition, this study is an attempt to find alternative materials replacement bricks. One of them is by using a mixture of portland cement, silica sand and styrofoam for the manufacture of non-structural lightweight concrete. Silica sand crushed into powder 22.44% retained on sieve no. 325 and styrofoam used in the form of small granules which pass 9.5 mm sieve. This study begins with a test mortar with silica sand content of 0%, 30%, 40%, 50% by weight of cement + silica sand. Then one of the mortar mixture composition is taken to be combined with Styrofoam to test concrete with styrofoam levels of 3%, 3.5%, 4% by weight of cement + silica sand. From the results of testing mortars, the composition of the mixture is taken as 40% silica sand and cement 60%. In testing the concrete, the greater the level of styrofoam, the smaller the volume weight, compressive strength, tensile strength and flexural strength concrete. The composition of concrete mixtures with styrofoam levels 3.5% and 4% which can be categorized as non-structural lightweight concrete material to be used as wall panels / insulation.
STUDY OF BEHAVIOUR BENDING CONCRETE BEAM FIBER PLASTIC BENESER COMPOSITES Kurdian Suprapto
Journal of Civil Engineering Vol. 31 No. 2 (2011)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v31i2.7596

Abstract

“Fiber reinforced concrete” is made from cement, fine aggregate, coarse aggregate, water and many fibers that randomly spread within the mixture. To increase the ability of concrete to resist tensile and flexure, efforts are done by giving reinforcements or other material such as fibers in the tensile region.In this research the examination done in experiment with add plastic fibers of plastic benneser (poly-acrylonitryl styrene) in concrete mixture, with the percentage between 0% - 1, 00%.Otherwise in this research, the use of high concrete quality, are developing from the past research would have done in Unitomo. And the purpose of this research is to know the behavior of the mechanic phenomena like stretch and ductility from fibers concrete of beneser of higher concrete quality as united. So with this could be compare with the higher concrete quality without fibers. The concrete sample of fibers composite is made with three different things like: cylinders sample with size Ø10 and 15 cm high 20 and 30 cm, and block sample with size 15 X 20 X 60 cm. Cross section of full fibers composite and partial is used by block sample, only in stretch area below the neutral lines. The result says that: strengthened in splitting in a cylinder sample between 12, 56 – 27, 07 %, and the power of ductility from the block sample of full fibers between 12, 95 % – 20, 19 %, and the partial is 12 – 16, 57 %.
EVALUATION OF PERFORMANCE OF ASYMMETRICALLY DUAL SYSTEM STRUCTURES USING PUSHOVER AND TIME HISTORY ANALYSES Kurdian Suprapto; Sudarto Sudarto
Journal of Civil Engineering Vol. 29 No. 1 (2009)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v29i1.7604

Abstract

Performance-based design is becoming increasingly popular in designing a seismic resistant building. In the study, a twelvestory, reinforced concrete office building with asymmetric configuration using dual system located in seismic zone 6 was designed conforming to the Indone sian S e i smi c Code SNI 03-1726-2002 and the Indonesian Concrete Building Code SNI 03-2847-2002. The seismic performance of the building was evaluated using the Static Nonlinear (Pushover) Analysis and Inelastic Dynamic Time History Analysis. The performance point obtained from the pushover analysis was defined using various methods, such as FEMA 356, ATC-40, FEMA 440, and SNI 03-1726-2002. The result of the study indicated that the highest performance point was that obtained according to FEMA 356 and FEMA 440, whereas the lowest value was that in accordance with SNI-03-1726-2002. The roof displacement difference of that obtained from El-Centro dynamic analysis and performance-point pushover analysis can reach up to 5 cm and 2.4 cm in X- and Y-directions, respectively. This indicates that the pushover analysis is quite accurate for evaluating the corresponding building since the first mode shape is quite dominant.
Co-Authors Fauzi Rahman Mudji Irmawan Sudarto Sudarto Tavio, Tavio Yanuar Siscaria Rahmawati