Abstract
For a reinforced concrete column to behave in a ductile manner without much loss on strength requires sufficient confinement to the concrete core. One way to provide confinement to the concrete core is to use external confining devices such as a series of thin-walled circular steel sheet tube to confine the concrete. This type of external confining device falls off on the categories of Steel Tube Confined Concrete (STCC). With the presence of a gap between the steel sheet, the buckling on the tube due to high axial stresses can be avoided. On the other hand, STCC also offers great advantages to strengthen a non-code conforming reinforced concrete column to achieve better resistance to withstand earthquake load. From the numerical analysis point of view, the important task to successfully model the STCC specimen lies in the modeling of the interface behavior between concrete and steel tube. For that purpose, in this paper, the 3D-NLFEA package is used to study the response of STCC. The analysis result is further compared with the available test results in the literature. From the analysis, the predicted response is excellent. Detailed discussion on the parameter of the interface behavior between concrete and steel tube is presented.
Highlights
With the rapid research development of seismic risk in Indonesia, there is a need to evaluate existing structures to conform to the new design regulations
There were many ways to strengthen the RC column, in this paper, the attention is focused on the external strengthening using a series of thin-walled circular steel sheet tube confined concrete which well known as Steel Tube Confined Concrete (STCC)
There were mainly four stresses which play an important role to understand the behavior of steel tube on the STCC specimen. These stresses were the hoop stress or the transverse stress, the axial stress, and the lateral stress which was equivalent to the confining pressure to the concrete core, and shear friction stress (f) which transfer via the skin-friction between the concrete and the steel tube
Summary
With the rapid research development of seismic risk in Indonesia, there is a need to evaluate existing structures to conform to the new design regulations. The STCC specimen investigated in this paper consisted of a steel tube element with a gap. This gap will prevent the occurrence of local buckling on the tube and reduces the axial stress development on the tube during loading. The constitutive model for the interface element was based on the Mohr-Coulomb plasticity model with softening It was not clear on the detail parameter for the plastic potential function used in the simulation. 3D-NLFEA has been used to simulate RC confined with carbon fiber wrap [6, 14], cover spalling analysis in high- and very high-strength RC column [5], and concrete-filled steel tube under eccentric and concentric loading [15, 16]. The displacement increment for each time step is set to -0.01 mm
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