Response Of RC Columns Research Articles

Influence of Standoff Distance on the Response of RC Columns Subjected to Close-In Explosions

Influence of Standoff Distance on the Response of RC Columns Subjected to Close-In Explosions

Structural behaviour of Reinforced Concrete (RC) columns under fire

The paper presents a numerical study on the response of RC columns under fire. The numerical studies deal with both: during fire (fire rating) scenario and after fire (residual) scenario. The results highlight the importance of Load-Induced-Thermal-Strains (LITS) for predicting the Fire Rating (FR) of RC columns. The predicted temperature variation across the cross-section and axial deformation of column with time are in good agreement with the experimental measurements available in literature. The importance of considering cooling phase of fire for evaluating the behaviour of RC columns has been emphasized. Because of the peak temperatures occurring during the cooling phase and the additional damage due to cooling, the column may also fail during cooling period. The effect of exposure duration on the residual axial load carrying capacity of RC columns has also been discussed. The presented numerical studies using 3D fully-coupled thermo-mechanical model for simulating the behaviour of axially loaded RC columns during the complete fire hazard situation, shows its capabilities to realistically account for different strain components and damage components occurring during different phases of fire hazard (viz. heating-phase, cooling-phase & residual-state). The model uses temperature dependent microplane model for concrete and classical von-Mises plasticity models for reinforcing steel.

Research on Dynamic Factor of the Column with Different Constraints Subjected to Blast Shock

In this paper, the finite element program LS-DYNA was used to simulate the dynamic response of RC column with different constraints subjected to blast pressure. Through analyzing the five group columns with fixed end as well as one end fixed and one end simply supported, the maximum middle displacement and its relation with T/Tω were obtained. Thereby the dynamic factor of the column under blast pressure was acquired. Consequently the displacement response spectrum curve of the column was drawn. The results provide reference value to the design and protection of the RC column.

Application of fiber element in the assessment of the cyclic loading behavior of RC columns

This paper studies the reliability of an analytical tool for predicting the lateral load-deformation response of RC columns while subjected to lateral cyclic displacements and axial load. The analytical tool in this study is based on a fiber element model implemented into the program DRAIN-2DX (fiber element). The response of RC column under cyclic displacement is defined by the behavior of concrete, and reinforcing steel under general reversed-cyclic loading. A tri-linear stress-strain relationship for the cyclic behavior of steel is proposed and the improvement in the analytical results is studied. This study only considers the behavior of columns with flexural dominant mode of failure. It is concluded that with the implementation of appropriate constitutive material models, the described analytical tools can predict the response of the columns with reasonable accuracy when compared to experimental data.