Equation for stress-strain curve of concrete confined in circular steel spiral

A New Plasticity Model for Concrete in Compression Based on Artificial Neural Networks

“…Numerical results on the behavior of concrete compressive uniaxial with different compressive strength and elastic modulus were compared with the results of the test by Hognestad et al [17], and Desayi Krishnan [18] (see Figure .4). Figure 4, the proposed model accurately describes the behavior in uniaxial compression of concrete with different compressive strengths and module of elasticity.…”

Nonlinear concrete model for an internally confined hollow reinforced concrete column

“…There are only circumferential pressures on the concrete by arching actions. The confining stress in the circumferential direction ( f lc ) can be calculated by the same method as the general solid RC member as equation (6). The confining stress in the radial direction can, however, be assumed to be zero f lr ¼ 0.…”

“…The result of experimental tests for rectangular transverse reinforcements conducted by Roy and Sozen 2 demonstrated that there was no increase in concrete strength, but a significant increase in ductility could be achieved. Iyengar et al 3 and Desayi et al 6 showed that there was a significant increase in both strength and ductility of concrete members including circular steel spirals. Vallenas et al, 7 Sheikh and Uzumeri 8 and Scott et al 9 tested more realistically scaled specimens of real building columns and presented the stress-strain relations of the specimens.…”

“…The hollow RC column with internal transverse reinforcements produces more strength and ductility than the hollow RC column without internal transverse reinforcements. [2][3][4][5][6] Many studies have been performed on the confining effect of concrete in a RC column. The result of experimental tests for rectangular transverse reinforcements conducted by Roy and Sozen 2 demonstrated that there was no increase in concrete strength, but a significant increase in ductility could be achieved.…”

Preliminary Comparison Between Different Software Modeling of Confined Concrete

“…The confinement effectiveness coefficient depends on the configuration of the hoop reinforcement. Stress-strain equations for concrete confined by spiral reinforcement have been proposed by Park and Leslie (1977) [12], Desay et al (1978) [13], Shah (1982, 1985) [14], [15], Dilger et al (1984) [16], and others.…”