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All Journal Jurnal Teknik ITS IPTEK The Journal for Technology and Science Journal of Civil Engineering Jurnal Aplikasi Teknik Sipil COMSERVA: Jurnal Penelitian dan Pengabdian Masyarakat
Bambang Piscesa
Civil Engineering Department, Faculty Of Civil, Environmental And Geo Engineering, Institut Teknologi Sepuluh Nopember (ITS), Surabaya, Indonesia
Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Education Engineering Industrial & Manufacturing Engineering Social Sciences

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Journal : Journal of Civil Engineering

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Strength Reduction Factor of Square Reinforced Concrete Column Using Monte Carlo Simulation Wahyuniarsih Sutrisno; Bambang Piscesa; Mudji Irmawan
Journal of Civil Engineering Vol 35, No 2 (2020)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v35i2.8657

Abstract

This paper investigates the strength reduction factor (f) of reinforced concrete (RC) columns using Monte-Carlo simulation (MCS). The main objective of this paper is to evaluate the strength reduction factor of the RC using the authors' developed code. This code is important for further research to check other important effects when high-strength materials are used. The investigated RC column concrete compressive strengths (fc) are 40 and 60 MPa while the rebar strengths (fy) are set to 320, 400, and 500 MPa. Fiber-based cross-sectional analysis is used to compute the axial-moment interaction capacity of the RC column. The concrete compressive block is used to model the concrete contribution and the bilinear stress-strain model is adopted for the rebar. These simplifications can reduce the difficulties when solving the equilibrium of the forces in the sectional analysis. The parameters used in the sensitivity analysis of the strength reduction factor (f) are the concrete compressive strength (fc), the rebar yield strength (fy), the longitudinal rebar ratio (r), and the column size (b,h). The effect of the coefficient of variations for each material on the resistance variation coefficient of the RC is also investigated. From the analysis, it can be concluded that when the RC column falls in the tension-controlled region, the obtained strength reduction factor is 0.93 which is slightly higher than the value of f in ACI 318-19. On the other hand, when the RC column falls in the compression-controlled region, the obtained strength reduction factor is 0.6 which is lower than the value of f in ACI 318-19 which is 0.65.
Non-linear finite element analysis of reinforced concrete deep beam with web opening Ferry Alius; Bambang Piscesa; Faimun Faimun; Harun Alrasyid; Data Iranata
Journal of Civil Engineering Vol 35, No 1 (2020)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v35i1.7480

Abstract

The use of Reinforced Concrete (RC) deep beams in building may requires web openings or holes for electrical and mechanical utilities passage. This web opening will change the behavior of RC deep beam and may resulted in early cracks even at service load. Hence, it is important to use a suitable tool to predict the full response of RC deep beam with opening. For that purpose, nonlinear finite element method using 3D-NLFEA software package which utilize a plasticity-fracture model is used to predict the behavior of RC deep beam. One deep beam specimen available in the literature is investigated. To study the effect of using structured and unstructured mesh, as well as different element types on the load deflection curve, hexahedral and tetrahedral solid element was used. From the comparisons, it was observed that the crack pattern between two different meshes was not similar. Structured mesh often has straighter crack propagation compared to the unstructured mesh. The load deflection curve for both models are similar and both models were performed satisfactorily in predicting the peak load of the deep beam.
3D non-linear finite element analysis of concentrically loaded high strength reinforced concrete column with GFRP bar Adhi Dharma Prasetyo; Bambang Piscesa; Harun Al Rasyid; Dwi Prasetya
Journal of Civil Engineering Vol 35, No 1 (2020)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v35i1.7750

Abstract

The use of High Strength Concrete (HSC) material in Reinforced Concrete (RC) column has become widely used. HSC was found to be durable, strong in compression, but it has low ductility. This low ductility of HSC can be improved by providing confinement. However, for HSC with concrete strength higher than 70 MPa, additional clause for confinement in ACI 318-19 generates denser arrangement of transverse bars and eventually creates weak planes between the concrete core and the cover. These weak planes can trigger early cover spalling. To reduce the utilization of confining bars, high-strength Glass Fiber Reinforce Polymer (GFRP) bar can be used. However, the performance of GFRP bar varies significantly from their uniaxial behavior in tension or compression to the real performance when it is used as the main reinforcement. For that reason, this paper tries to investigate the behavior of HSC RC column with bars made of conventional steel rebar and with GFRP bars. Due to limited data on the strain gauge reading on the GFRP bars from the available test result, an inverse analysis is carried out to determine the best stress-strain curve for GFRP bars used as the main reinforcement. For that purpose, an inhouse finite element package called 3D-NLFEA is used. From the comparisons, it was found out that the peak load, softening behavior, and the concrete core enhancement prediction agrees well with the test result. From the inverse analysis, only 25% and 45% of the GFRP bar yield strength can be deployed when loaded under compression and tension, respectively.
DUCTILITY EVALUATION OF REINFORCED CONCRETE COLUMN MADE OF NORMAL- TO HIGH-STRENGTH CONCRETE UNDER CONSTANT AXIAL LOAD LEVEL COMBINED WITH FLEXURAL LOADING USING NONLINEAR SECTIONAL FIBER BASED MODEL Bambang Piscesa; Dwi Prasetya; Mudji Irmawan; Harun Alrasyid
Journal of Civil Engineering Vol 34, No 1 (2019)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (388.291 KB) | DOI: 10.12962/j20861206.v34i1.5451

Abstract

This study presents the ductility evaluation of reinforced concrete column made of normal-strength material using various empirical stress-strain model with nonlinear sectional fiber based analysis. The purpose is to evaluate the confinement requirement for reinforced concrete column under high axial load level. The concrete strength considered in the analysis are varies from 30 to 70 MPa while the steel reinforcing bar yield strength considered is only 400 MPa. The ductility is evaluated by using the customized ductility index measurement. The ratio of the concrete cover to the concrete core is set to 0.1 but not more than 40 mm. Attard and Setunge’s concrete constitutive model is used in this investigation. Cover spalling behavior is considered in the analysis by including the restrained shrinkage effect on the concrete strength and the softening behavior. From this study, it was found that extra confinement is necessary to maintain the expected minimum level of ductility.
Strut and tie model optimization for reinforced concrete deep beam using genetic algorithm Bambang Piscesa, PhD; Tavio Tavio
Journal of Civil Engineering Vol 35, No 1 (2020)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v35i1.7754

Abstract

This paper presents strut and tie model structural optimization of reinforced concrete deep beam using genetic algorithm. Genetic algorithm is used as the optimization platform as it does not require differentiation of the exact mathematical formulation to get the optimum solution. The force analysis is carried out using two-dimensional linear finite element method with truss element. The struts and ties design are based on ACI 318. One RC deep beam example is presented as an example. During optimization, there are two constraints which consisted of strength of the member alone and combination with deformation limit of the nodes. The stress ratio for both struts and ties are set to not exceed unity while the deformation was limited to 2.0 mm. From the optimization analysis, it can be concluded that genetic algorithm can be used to get the most optimum structural configuration which yield the most economical solution for design purposes. On the other hand, it is found out that optimizing only the strength alone can yield a more economical solution compared to the design references. However, if deformation constraint is added in the optimization parameters, larger deep beam depth is required to satisfy the deformation limits.
Strut and tie model optimization for reinforced concrete bridge pier head structure using a genetic algorithm Bambang Piscesa; Tavio Tavio
Journal of Civil Engineering Vol 35, No 2 (2020)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v35i2.8573

Abstract

Strut and tie model (STM) is more suitable to design the pierhead structures which resist high shear forces transferred from the girders. These pierhead structures behave like the disturbed regions as in reinforced concrete deep beam. The design of the struts and ties elements requires the initial geometry configuration of the truss model where its boundaries are limited by the shape of the pier head structures. To find the optimum topological shape of the truss model, the genetic algorithm (GA) optimization technique is used in this paper. The objective functions in the GA optimization consisted of minimizing the usage of concrete and steel reinforcement material and ensuring all the stress ratio of the strut and tie elements are less than equal to unity. Both prestressed and non-prestressed pierheads are investigated in this paper. The use of prestressing in the pierhead structures reduces the stresses in the main tension tie significantly and allowing some members of the shear tie and compression struts to have almost zero stresses. For these elements with zero stresses, the elements can be removed and reduces the concrete and rebar materials usage. Furthermore, the genetic algorithm optimization is found to be successful to ensure all the stress ratio in the members to be less than equal to unity.
SHEAR BUCKLING ANALYSIS OF CORRUGATED WEB I-GIRDER WITH 3D NONLINEAR FINITE ELEMENT METHOD Ni Putu Ary Yuliadewi; Heppy Kristijanto; Bambang Piscesa; Priyo Suprobo; Faimun Faimun
Journal of Civil Engineering Vol 36, No 2 (2021)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v36i2.9611

Abstract

This paper presents a shear buckling analysis of corrugated web I-girder beam using nonlinear finite element analysis. An in-house finite element package called 3D-NLFEA is used in the simulation. The steel material is modelled as solid elements with one-eight aspect ratio between the element size and its thickness. The double sine waves equation is used to generate the initial imperfection in the corrugated web. The nonlinear geometry deformation, which is essential in capturing the buckling behavior, is considered using the 2nd order analysis in 3D-NLFEA. A comparison with the carried out experimental test in the laboratory showed that the peak prediction from the analytical model was in good agreement. Furthermore, using the double sine waves equation as the initial imperfection can closely predict the buckling mode and shapes of the corrugated web I-girder as obtained from the experimental test.
FINITE ELEMENT MODELING OF CIRCULAR REINFORCED CONCRETE COLUMN CONFINED WITH CFRP UNDER ECCENTRIC LOADING Angga Bayu Christianto; Bambang Piscesa; Faimun Faimun; Pujo Aji
Journal of Civil Engineering Vol 34, No 2 (2019)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v34i2.6375

Abstract

This paper presents nonlinear finite element analysis of eccentrically loaded circular Reinforced Concrete (RC) column confined with Carbon Fiber Reinforced Polymer (CFRP) wraps. The concrete constitutive model uses a plasticity-fracture model which is restraint sensitive, utilize a non-constant plastic dilation rate, and is able to simulate the plastic volumetric compaction of concrete core under high confining pressure. For validation of the models, two available specimens from the literature are used in the validations. Excellent agreement between the numerical models and the available test results are obtained in this study. A detailed investigation on the confinement effectiveness of both external and internal confining devices are presented and discussed. This discussion of the confinement effectiveness is important to be included in the design formula.
NUMERICAL INVESTIGATION OF GEOPOLYMER REINFORCED CONCRETE BEAMS UNDER FLEXURAL LOADING USING 3DNLFEA Yosi Noviari Wibowo; Bambang Piscesa; Yuyun Tajunnisa
Journal of Civil Engineering Vol 37, No 1 (2022)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v37i1.12095

Abstract

The development of geopolymer concrete is one of the most significant breakthroughs to replace the OPC concrete causing global warming issues. Investigations on the structural behavior of geopolymer concrete are limited and still need adjustments in numerical simulations to experimental results in previous studies. This study investigated the flexural behavior of geopolymer concrete as a structural member using the numerical method. The utilization of the finite element method is an alternative to widely determining the structural behavior of geopolymer concrete as a construction material. In this study, the author refers to the research conducted by Pham et al. The research developed a four-point bending test with variations in tensile steel reinforcement ratio. The results of the experimental tests that Pham has carried out will be verified by numerical simulation in three dimensions. The validation of experimental specimens with numerical specimens is done to compare the moment-curvature and the crack pattern of concrete. Numerical investigation accurately captures the structural behavior of moment-curvature and crack pattern of geopolymer concrete. The moment maximum deviation between experimental and numerical results is 1.3 to 2.4%. However, there are differences in the number and length of cracks in the bending moment area. The difference of crack pattern in the bending moment area between experimental results and numerical results due to the modeling did not consider the input of fracture energy. The experiment from referenced studies did not include fracture energy data, so the 3DNLFEA modeling used the fracture energy value of OPC concrete.
MODELING PULL-OUT BEHAVIOR OF THE DEFORMED REBAR EMBEDDED INSIDE THE REINFORCED CONCRETE Kohar Yudoprasetyo; Bambang Piscesa; Harun Alrasyid
Journal of Civil Engineering Vol 37, No 1 (2022)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v37i1.11871

Abstract

Abstract: This study presents the modeling of the pull-out behavior of deformed bars embedded inside the reinforced concrete element. The simulation uses an in-house finite element package called 3D-NLFEA. Sufficiently small solid elements that consider the frictional resistance and mechanical interlocking between the bar thread and the concrete matrix were used in the simulation. The effect of concrete compressive strength, cover thickness, and stirrup configuration on the pull-out capacity of the modeled specimens are investigated thoroughly. The modeling found out that the 3D-NLFEA package can capture the bond-fracture process at the interface between the bars and concrete. The fracture that occurs in the concrete was dominated by tensile splitting failure. The presence of stirrups that confined the concrete and restrained the crack propagation significantly influences the pull-out capacity, cracking pattern, and failure behavior at the bar interface with the concrete. The analysis results from 3D-NLFEA are also compared with the 3D-RBSM analysis results available in the literature. From the comparison between the two packages, it can be concluded that the analysis result from 3D-NLFEA is somewhat more conservative compared to the 3D-RBSM.
Co-Authors . Faimun Abdul Rochim Achfas Zacoeb Achmad Zubaydi Adena, Haura Adhi Dharma Prasetyo Ainun Najib Aji, Pujo Alrasyid, Harun Alrasyid, Harun Angga Bayu Christianto Asdam Tambusay Ayu Dewadatta, Ni Wayan Amrita Dwi Prasetya Dyah Sukma Putri Andini Endah Wahyuni Ferry Alius Harun Al Rasyid Harun Al Rasyid Heppy Kristijanto Hidajat Sugihardjo Ika Salsabila Nurahida Imron Imron Iranata, Data Irmawan, Mudji Kohar Yudoprasetyo Lada, Adveni Hesty Altisari Lestari, Laras Laila Lina Febrianty Mudji Irmawan Muhammad Aziz Mubarok Muhammad Rifky Trisnawardhana Muhammad Satrya Ageta Ni Putu Ary Yuliadewi Prasetya, Dwi Pratama Yuli Arianto Priyo Suprobo Pujo Aji Refani, Afif Navir Silalahi, Oktavia Ully Artha Suswanto, Budi Sutrisno, Wahyuniarsih Sutrisno, Wahyuniarsih Tavio, Tavio Tugas Hutomo Putra Tuswan Tuswan Wahyuniarsih Sutrisno Wisnu Priambodo Yosi Noviari Wibowo Yuyun Tajunnisa