Abstract
Reversed cyclic loading tests of two circular hollow RC piers were conducted in this study to investigate the effect of different amounts of inner and outer circular hoops on their flexural behavior. The test results showed that the column with a smaller amount of inner circular hoops presented better flexural response than the as-built column with an equal amount of inner and outer circular hoops. Also, the demand developed on the inner circular hoops was smaller than the outer one within the plastic hinge regions, which verified that using a smaller amount of inner circular hoops was reasonable and effective. By examining the confining stress experienced by the concrete in the radial and circumferential directions based on a detailed theoretical analysis, a modeling approach was proposed to take the confinement effect in circular hollow RC piers into consideration. The proposed modeling approach was validated through comparisons with the experimental study and satisfactory agreement was found.
Highlights
Long-span and high-elevation concrete bridges have been constructed throughout the world, such as Millau Viaduct in France, San Marcos Bridge in Mexico, Hezhang Bridge in China
5 Conclusions The flexure behavior of two circular hollow RC piers with different amounts of the inner and outer circular hoops was investigated in this study
The confinement-induced transverse strains of the inner and outer circular hoops, as well as cross-ties within the plastic hinge regions, were recorded, and the confining stress in these hollow piers was developed based on a detailed theoretical analysis
Summary
Long-span and high-elevation concrete bridges have been constructed throughout the world, such as Millau Viaduct in France, San Marcos Bridge in Mexico, Hezhang Bridge in China. Yeh et al (2001) investigated the effects of ductility and dissipated energy of three hollow circular bridge piers Based on their finite element analysis, the inside transverse reinforcement was not required due to confining not existing pressure. Papanikolaou and Kappos (2009a, b) performed a parametric analysis on approximately 180 piers (circular, square, solid, and hollow sections) that were subjected to axial compression, using three-dimensional finite element analysis. They found that the inner and outer transverse reinforcement are required to be connected with cross-ties to provide satisfactory confining effect. An analytical approach was proposed and validated to account for the confining effect of transverse reinforcement in circular hollow RC piers
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