Post-Tensioned (PT) method is a widely used technique to prevent cracking and to minimize the deflection which is resulted by loads. In this method, stress is applied after concrete placing and reach adequate hardening and strength. This paper investigates the structural behaviour of PT two-way concrete slabs. The main objective of this study involves a detailed flexural behavior analytical investigation of PT concrete two-way slab with the different bonded tendon layout. This will be achieved by non-linear Finite Element (FE) analysis programs method, to choose the most effective and optimum position of tendon layout with different number of tendons and applied load on the concrete two-way slab. A parametric study was conducted to investigate the effect of tendons layout on the overall behavior of post-tensioned twoway concrete slab. The result obtained from finite element analysis showed that the failure load in PT in both directions increased about 89 % as compared with slab PT in one direction.
The objective of structural design is to select member sizes with the optimal proportioning of the overall structural geometry. Conventional steel I-beam with variable depth have been used widely in various engineering fields. The objective of this study is to develop a three-dimensional finite element model for the total volume of steel I-beam with variable depth. The finite element software package ANSYS was used to determine the optimum total volume for the steel I-beam with variable depth. The purpose of the study is to minimize the total volume of the steel beam. The design variables are the height of the steel beam at support, the flanges width, the thickness of flanges, the height of the steel beam at mid-span, and the web thickness. The constraints considered in this study are the normal stress in steel beam and the mid-span displacement of the steel beam. Optimization results of steel beam indicate that the total volume was reduced approximately by 52 %.
The most commonly used test method for measuring the bond strength between reinforcing bars and concrete is the pull-out test of pulling a reinforcing bar out of a concrete block. During serviceability and durability design the bond of reinforcing bars is important in crack control. This paper presents numerical model for studying the size effect on pull-out force. This research considers three bar size diameter, which is 10, 12 and 16 mm bar diameter. The finite element ANSYS software was used for the numerical analysis. The specimens are analyzed until the specimens failure were occurred. The analytical results indicate that the pull-out force increase with increasing bar diameter. The pullout force for specimens S12 and S16 are increase (7% and 35%) compared with specimen S10 respectively.
There have been great developments in the area of civil engineering in the recent few decades and among these, construction and material innovation are quite prominent. Steel-concrete composite construction has emerged as one of the fastest methods of construction. Even though considerable research efforts on conventional reinforced concrete columns have been executed prior to now, concrete filled steel tube (CFST) composite columns however have received limited attention. This work aims to study the experimental behavior of steel tubular specimens. Plastic and steel specimens are considered with circular and square sections filled with the concrete with the steel fiber and as well, plain concrete. Four parameters are considered in this study which are sectional designs (circular and square), tube thickness (2 and 5 mm), tube material (plastic and steel) and content of steel fiber (0 and 5%). Ten concrete filled steel tubular columns were cast and tested. Two circular columns were made from plastic and the other made from steel. The main purpose of this work are study the effect of steel fiber and cross section on the ultimate load capacity of columns. It was discovered the utilization of steel fiber reinforced concrete filled steel tubular columns have comparatively substantial stiffness in comparison with plain concrete filled columns.
Reinforcing bar bonding in concrete is essential for reinforcing bar anchoring and reinforced concrete cracking control. A pull out test of a reinforcing bar embedded in a concrete block is commonly used to determine it. When compared to plain concrete, steel fiber enhanced the mechanical properties of reinforced concrete. This paper presents experimental and analytical study on pull-out force of steel fiber-reinforced concrete blocks. Experimental program consists of six specimens. Two parameters are considered in this study, which are steel bar diameter and content of steel fiber. The numerical analysis was conducted by the finite element ANSYS software and was carried out on the experimental specimens. An analytical analysis was conducted to investigate the developing of the shear stress in surrounding concrete in XZ-plan and stresses in steel bar. Test results show that the steel fibers had significant influence on the increase of the pull-out force. The pull-out force increased by 3%, 4% and 15%, for CS1, CS2 and CS3 compared with specimens without steel fiber C1, C2, and C3 respectively.
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