Papers by Hibretu Kaske Kassa
https://www.researchgate.net/journal/Advances-in-Civil-Engineering-1687-8094?_sg=PW78gPb1L2tOMtzetwrOLiaG1rRpY8k3kzPABszHhDrPd27M2KulxbrjdYYwFeYamjwh72PFMjuVPZsdJ5G8dOEmyqKWJQ.zG6KGUDX826K0czS1EwgGNZdYuLO_ajsi6XRdfL_k4dklBAhqlhI0ZlbhFG8KJHBvEije_sQe-3ImgAujQ29QQ, 2023
Te most common types of composite columns used in high•rise structures are concrete•flled steel t... more Te most common types of composite columns used in high•rise structures are concrete•flled steel tubes (CFSTs) and concrete• encased steel (CES) that are either entirely or partially encased in concrete. Te attempt of this study is to develop a suitable constitutive model addressing the behavior of fully encased composite slender columns with high•strength concrete subjected to axial loading. Te nonlinear fnite element (FE) package ABAQUS version 6.14•2 is used to study the response of fully encased composite (FEC) slender columns. Te fnite element analysis (FEA) results are validated with experimental data extracted from previous experiments. Ten, the parametric study is conducted on rectangular FEC columns with diferent shapes of encased steel encasements to investigate the axial load•carrying capacities, axial deformation, ductility, load•deformation behavior, and confnement of FEC columns. Te governing parameters for the current study are the high strength of concrete (90 MPa, 100 MPa, and 120 MPa), shapes of encased steel sections (circular, I•shaped, and rectangular steel encasements), and spacing of tie bars (50 mm, 100 mm and 150 mm). 6-21% of load increment is observed by changing the concrete compressive strength. A comparison is also made between the results of reinforced concrete and FEC slender columns and 2-11% of load increment is recorded by changing the shape of structural steel and keeping other parameters constant. Te results of calibrated fnite element models revealed that closely spaced tie bars resulted in a good ductility of FEC column with high•strength concrete (HSC). Signifcant enhancements in the axial load capacity are observed in the case of FEC slender columns than in RC slender columns of the same size and shape. Ductility and residual strength after the failure of FEC columns are also observed to increase signifcantly with the adoption of tubular structural steel sections. However, increasing the concrete strength results in the reduction of this ductility.
Advances in Civil Engineering
The most common types of composite columns used in high-rise structures are concrete-filled steel... more The most common types of composite columns used in high-rise structures are concrete-filled steel tubes (CFSTs) and concrete-encased steel (CES) that are either entirely or partially encased in concrete. The attempt of this study is to develop a suitable constitutive model addressing the behavior of fully encased composite slender columns with high-strength concrete subjected to axial loading. The nonlinear finite element (FE) package ABAQUS version 6.14-2 is used to study the response of fully encased composite (FEC) slender columns. The finite element analysis (FEA) results are validated with experimental data extracted from previous experiments. Then, the parametric study is conducted on rectangular FEC columns with different shapes of encased steel encasements to investigate the axial load-carrying capacities, axial deformation, ductility, load-deformation behavior, and confinement of FEC columns. The governing parameters for the current study are the high strength of concrete (...
Advances in Materials Science and Engineering
This study focuses on the behavior of a three-dimensional reinforced concrete dapped-end beam sub... more This study focuses on the behavior of a three-dimensional reinforced concrete dapped-end beam subjected to the effects of impact velocity and dapped-end beam cross-section geometry by numerical simulation using ABAQUS (V6.14) software under a constant impact load. The finite element software ABAQUS is utilized to simulate and analyze the drop impact to obtain accurate and detailed results. A sudden drop impact is a short-duration dynamic load that could involve very large deformations and damage to the reinforced concrete dapped-end beam. The finite element analysis has been completed by creating the geometry, material properties, boundary conditions, and loading conditions. In this study, a total of seven analyzes were conducted with different parameters, i.e., the effect of the velocity of the impact load and the geometry of the dapped-end beam cross-section. From the finite element analysis results, it can be concluded that as the impact velocity increases, the impact force and m...
Advances in Civil Engineering
The most common types of composite columns used in high-rise structures are concrete-filled steel... more The most common types of composite columns used in high-rise structures are concrete-filled steel tubes (CFSTs) and concrete-encased steel (CES) that are either entirely or partially encased in concrete. The attempt of this study is to develop a suitable constitutive model addressing the behavior of fully encased composite slender columns with high-strength concrete subjected to axial loading. The nonlinear finite element (FE) package ABAQUS version 6.14-2 is used to study the response of fully encased composite (FEC) slender columns. The finite element analysis (FEA) results are validated with experimental data extracted from previous experiments. Then, the parametric study is conducted on rectangular FEC columns with different shapes of encased steel encasements to investigate the axial load-carrying capacities, axial deformation, ductility, load-deformation behavior, and confinement of FEC columns. The governing parameters for the current study are the high strength of concrete (...
Advances in Civil Engineering
In the concrete construction sector, issues such as tensile strength of structural elements, brit... more In the concrete construction sector, issues such as tensile strength of structural elements, brittle mode of failure, rapid crack propagation, and increased overload are common. The experimental evaluation of the flexural strengths of glass fiber-reinforced polymers with various percent of glass fiber content is the focus of this study. Fiber-reinforced polymer is the focus of numerous studies right now all over the world. Experimental investigations done on the behavior of the concrete strengthened using discontinuous chopped glass fiber were carried out with C-25 concrete mix and 50 mm of glass fiber at various percentages (0.25%, 0.50%, 0.75%) of addition by the total weight of concrete. Experimental data on load for flexural tests have been carried out. Strength variations and failure modes of each specimen have been obtained. According to ASTM standards, at 7, 21, and 28 days after casting, all beams, such as control and fiber-reinforced concrete beams, are tested by third poin...
SSRN Electronic Journal, 2021
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Papers by Hibretu Kaske Kassa