Cyclic stress-strain model incorporating buckling effect for steel reinforcing bars embedded in FRP-confined concrete

2017 ◽  
Vol 182 ◽  
pp. 54-66 ◽  
Author(s):  
Yu-Lei Bai ◽  
Jian-Guo Dai ◽  
Togay Ozbakkaloglu
Keyword(s):  
Cyclic Stress ◽  
Confined Concrete ◽  
Reinforcing Bars ◽  
Stress Strain ◽  
Strain Model

Cyclic stress-strain model for FRP-confined concrete considering post-peak softening

2018 ◽  
Vol 201 ◽  
pp. 902-915 ◽  
Author(s):  
Pengda Li ◽  
Yu-Fei Wu ◽  
Yingwu Zhou ◽  
Feng Xing
Keyword(s):  
Cyclic Stress ◽  
Confined Concrete ◽  
Stress Strain ◽  
Strain Model

Improved Nonlinear Cyclic Stress–Strain Model for Reinforcing Bars Including Buckling Effect and Experimental Verification

2016 ◽  
Vol 16 (01) ◽  
pp. 1640005 ◽  
Author(s):  
Hong Yang ◽  
Yuntian Wu ◽  
Pengcheng Mo ◽  
Jinke Chen
Keyword(s):  
Nonlinear Behavior ◽  
Cyclic Stress ◽  
Cyclic Behavior ◽  
Reinforcing Bars ◽  
Stress Strain ◽  
Simulation Accuracy ◽  
Plastic Mechanism ◽  
Strain Relationship ◽  
Improved Accuracy ◽  
Strain Model

Buckling is an important nonlinear behavior of steel reinforcing bars subjected to repeated compression and tension strain reversals, which significantly affects the overall cyclic behavior of reinforced concrete (RC) elements and impairs their load-carrying and energy-dissipation capacities during strong earthquakes. The accuracy of numerical assessment of the seismic performance of RC elements can be much improved if the buckling effect is effectively included in the stress–strain model of reinforcing bars. In this paper, modified Gomes–Appleton cyclic steel stress–strain relationship intended for improved accuracy is presented, which is suitable for inclusion in programs based on Opensees platform for the nonlinear analysis of RC elements. The modification is developed to improve the simulation accuracy of the inelastic buckling stress–strain path by a simplified model based on the equilibrium of a plastic mechanism of buckled bar consisting of four plastic hinges. Then an adjustment coefficient is introduced to further modify the developed buckled bar stress–strain model. A comparison of the numerical simulated results with experimental results of 36 steel bars subjected to reversed tension-compression loading is performed to verify the accuracy and effectiveness of the proposed model.

scholarly journals Stress-strain model for grade 275 reinforcing steel with cyclic loading

1978 ◽  
Vol 11 (2) ◽  
pp. 101-109 ◽  
Author(s):  
K. J. Thompson ◽  
R. Park
Keyword(s):  
Axial Loading ◽  
Strain Curve ◽  
Cyclic Stress ◽  
Stress Strain ◽  
Reinforcing Bar ◽  
Strain Behaviour ◽  
Strain Relationship ◽  
Reversed Loading ◽  
Relationship Of ◽  
Strain Model

The stress-strain relationship of Grade 275 steel reinforcing bar under cyclic (reversed) loading is examined using experimental results obtained previously from eleven test specimens to which a variety of axial loading cycles has been applied. A Ramberg-Osgood function is fitted to the experimental stress-strain curves to follow the cyclic stress-strain behaviour after the first load run in the plastic range. The empirical constants in the function are determined by regression analysis and are found to depend mainly on the plastic strain imposed
in the previous loading run. The monotonic stress-strain curve for the steel, with origin of strains suitably adjusted, is assumed to be the envelope curve giving the upper limit of stress. The resulting Ramberg-Osgood expression and envelope is found to give good agreement with the experimentally measured cyclic stress-strain curves.

Compressive Stress Strain Model for Laterally Confined Concrete Columns with Steel Fibrous Composites

2021 ◽  
Vol 118 (3) ◽  
Author(s):  
Sary A. Malak ◽  
Neven Krstulovic-Opara ◽  
Rawan Sarieldine
Keyword(s):  
Compressive Stress ◽  
Concrete Columns ◽  
Confined Concrete ◽  
Fibrous Composites ◽  
Stress Strain ◽  
Strain Model

Stress-strain model for C-shape confined concrete masonry boundary elements of RM shear walls

2019 ◽  
Vol 183 ◽  
pp. 1059-1071
Author(s):  
Ala' T. Obaidat ◽  
Ahmed Ashour ◽  
Khaled Galal
Keyword(s):  
Shear Walls ◽  
Boundary Elements ◽  
Confined Concrete ◽  
Stress Strain ◽  
Concrete Masonry ◽  
Strain Model

Cyclic Behaviour of GFRP and Lateral Ties Confined Polyolefin Fibre Reinforced Concrete under Axial Repeated Compression

2013 ◽  
Vol 275-277 ◽  
pp. 1330-1334 ◽  
Author(s):  
S. Palanivel ◽  
M. Sekar
Keyword(s):  
Reinforced Concrete ◽  
Volume Fraction ◽  
Compressive Loading ◽  
Single Layer ◽  
Cyclic Stress ◽  
Hysteretic Behavior ◽  
Confined Concrete ◽  
Repeated Loading ◽  
Fibre Reinforced Concrete ◽  
Stress Strain

Confinement by fiber reinforced polymer (FRP) wraps can significantly enhance strength and ductility of concrete. Although various models exist for envelope curves of concrete confined by transverse reinforcement and FRP, only a few simple models represent the hysteretic behavior of the confined concrete; therefore, development of stress–strain model of unloading and reloading paths for confined concrete is needed. In this paper, an experimental and numerical investigation for describing the cyclic stress–strain behavior of lateral ties and FRP confined polyolefin fibre reinforced concrete (FRPCFRC) prisms under repeated axial compressive loading is presented. The study focuses on the effect of repeated unloading and reloading cycles on confined concrete prisms. The combined effect of spacing of lateral ties, FRP wraps and volume fraction of polyolefin fibres was studied both experimentally and numerically from the point of deformability characteristics of concrete under repeated loading as loading, unloading and reloading.The envelope curve is derived from the results of uniaxial, monotonic, compression loading tests on specimens. It explicitly accounts for the effects of lateral tie spacing of 145mm spacing and 75mm spacing, single layer of woven roving(GFRP) and polyolefin fibres of volume fractions 0.7% and 1.2% on concrete prisms of size 150 ×150 ×300 mm were investigated. The behaviour was also simulated in finite element numerical model in ANSYS software, with a view to analyzing FRPCFRC prisms under repeated loading. This analysis accounts for energy dissipation through hysteretic behavior, stiffness degradation as damage progresses, and degree of confinement. It was observed from hysteretic behavior that for increased confinement by FRP wraps and addition of polyolefin fibres the degradation of strength and stiffness reduces significantly.

Refinement of Lam and Teng's Design-oriented Stress-strain Model for FRP-confined Concrete

2006 ◽  
Vol 92 (1) ◽  
pp. 68-75
Author(s):  
Jin-Guang Teng ◽  
Tao Jiang ◽  
Lik Lam ◽  
Yaozhi Luo
Keyword(s):  
Confined Concrete ◽  
Stress Strain ◽  
Strain Model

Study on Stress-Strain Relationship of FRP-Confined Concrete Filled Steel Tubes

2010 ◽  
Vol 163-167 ◽  
pp. 3826-3829
Author(s):  
Feng Yu ◽  
Ping Wu
Keyword(s):  
Main Parameter ◽  
Steel Tube ◽  
Confined Concrete ◽  
Stress Strain ◽  
Steel Tubes ◽  
Concrete Filled Steel Tube ◽  
Strain Relationship ◽  
Relationship Of ◽  
Concrete Filled Steel Tubes ◽  
Strain Model

FRP-confined concrete filled steel tube may fully use the character of FRP-confined concrete and concrete filled steel tube. Based on the analysis of existing experimental data, the formula of ultimate bearing capacity of FRP-confined concrete filled steel tube is proposed. The mechanical behavior of FRP-confined concrete filled steel tube is mainly related to the equivalent confinement effect coefficient before the rupture of FRP. Based on the static equilibrium condition, the equivalent conversion section is adopted; taking as main parameter, the simplified stress-strain model of FRP-confined concrete filled steel tube is established. The predictions of the model agree well with test data.

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