THE BEHAVIOR OF SLENDER HIGH-STRENGTH CONCRETE COLUMNS SUBJECTED TO AXIAL LOAD WITH ECCENTRICITY AND CONFINEMENT

• Main Author: NUR'AINI , RYTHA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/12623
• Institution: Institut Teknologi Bandung

</i><b>Abstract: <i></b><p align="justify"> Today's possibility to produce concrete with higher compressive strength gives much advantageous especially in compressed members such as columns. The application of high strength reinforced concrete in columns possible to design columns more slender; consequently, give larger rentable area that leads to greater profits economically and architecturally. However, the behavior and structural response of high-strength concrete columns are not yet fully understood. <p align="justify"> This thesis deals with the behavior of reinforced high-strength concrete confined and unconfined slender columns under eccentricity compressive loading. The aim of this study is to increase the knowledge of the structural behaviors of slender columns consisting of confined and unconfined. The main topics of interest are to study how the confinement and the eccentricity influence the structural behaviors of the column. <p align="justify"> In the project, large-scale high strength concrete columns were tested with different end eccentricities. The slenderness and the cross section of columns were set uniformly. Three columns were confined and there columns were unconfined. The main parameters examined in this study are the eccentricities and confinement spacing. There are two types the longitudinal reinforcement ratio, 4 columns reinforced by longitudinal bar 13 mm and 2 columns reinforced by longitudinal bar 11 mm. The axial load was applied incrementally with eccentricity (0.3h, 0.4h, 0.5h) that measured from central line of columns. <p align="justify"> The results of this experimental work showed that, the columns behaved in a stiff manner and the deflection was small during the first part of the loading. Near the maximum load the deflection increased. The eccentricities give a big effect for the value of peak loads. Under big eccentricities load, the developments of cracks along the face of columns were rapidly growing compare to small eccentricities. The failure mostly happened to the failure of the longitudinal bars and the concrete that indicated the maximum load resistance was determined by buckling. Furthermore, it was observed that the stirrups in the high-strength concrete columns did not yield at maximum load. Therefore, to estimate the strength correctly it is necessary to use the actual stirrup strain or to design the reinforcement configuration so that yielding is reached at maximum load. The failure exhibited a sudden, explosive type of failure.</p>