Seismic Behavior of Under Confined Square Reinforced Concrete Columns

Rajput, Aditya Singh; Sharma, Umesh Kumar

doi:10.1016/j.istruc.2017.10.005

Cited by 7 publications

(3 citation statements)

References 8 publications

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“…A study conducted by Mo and Wang showed that the spacing of transverse reinforcement had a significant effect on the performance of the column [ 20 ]. However, it was confirmed that the ductility of the RC column was more sensitively affected by the axial force than the cross-sectional details [ 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Seismic Behavior of Existing Reinforced Concrete Columns with Non-Seismic Details under Low Axial Loads

Choi

Lee

2022

Materials

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Reinforced concrete (RC) columns of old existing buildings are vulnerable to earthquakes because the hoops comprising their transverse reinforcement are widely spaced and anchored using 90° hooks. This study extensively evaluated the seismic behavior of RC columns with such non-seismic details. Experiments were conducted by applying lateral cyclic loads to five full-scale column specimens with various transverse reinforcement details subjected to low axial loads. The experimental results demonstrated that the internal transverse crosstie had a significant confinement effect in the non-seismic detailed columns with 90° hoop anchor hooks. In addition, the lateral load–drift relationships, ductilities, and energy dissipation capabilities of the columns were not significantly affected by the hoop spacing or anchor hook angle when a low axial load was applied up to a drift ratio of 3.5% before failure. The evaluation model based on ASCE/SEI 41-17 was then shown to approximate the initial stiffness, maximum strength, and post-peak strength reduction behavior of the non-seismically reinforced column. This study was based on the experimental behavior of single column members, and it needs to be extended to research on frame structures in which columns are connected to beams and slabs.

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Section: Introductionmentioning

confidence: 99%

Seismic Behavior of Existing Reinforced Concrete Columns with Non-Seismic Details under Low Axial Loads

Choi

Lee

2022

Materials

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“…Therefore, there are many existing RC structures which were built prior to these codes came into being and thus are without the necessary ductile detailing features. Such RC structures need up gradation in view of the revised guidelines . The situation becomes all the more dangerous when these under‐confined RC elements are subjected to deterioration due to corrosion.…”

Section: Introductionmentioning

confidence: 99%

“…Such RC structures need up gradation in view of the revised guidelines. 1 The situation becomes all the more dangerous when these under-confined RC elements are subjected to deterioration due to corrosion. Instances of corrosion of many such under-confined RC elements are now rising due to increasing levels of carbon dioxide in the atmosphere and chloride concentration in the air and groundwater.…”

Section: Introductionmentioning

confidence: 99%

Performance of aged reinforced concrete columns under simulated seismic loading

Rajput

Sharma

2019

Structural Concrete

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Experimental investigations were carried out to examine the seismic performance of corroded reinforced concrete (RC) columns with sparsely distributed ties (under‐confined columns). Four full‐scale specimens were cast, corroded, and tested in this study. One specimen followed current seismic guidelines and acted as control column, while other three columns with larger tie spacing represented precode era under‐confined columns. Two of the three under‐confined columns were corroded to 15 and 30% corrosion degrees using a precalibrated accelerated corrosion regime. The entire study was intended to quantify the effect of inadequate confinement and corrosion on seismic response of RC columns. The results showed that the sparsely distributed transverse reinforcement resulted in lowering lateral strength and deformability of RC Columns. When these under‐confined columns were deteriorated by corrosion, their structural performance was found to have degraded significantly. It was observed that the specimens with 15 and 30% corrosion had 23 and 37.1% lower lateral load capacity respectively with respect to their un‐corroded counterpart. Furthermore, the observed lower values of ductility factors and other essential performance indicators manifested the adverse effects of inadequate confining reinforcement and aging‐related corrosion.

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Seismic retrofitting of corroded RC columns using advanced composite materials

Rajput

Sharma

2019

Engineering Structures

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Seismic Behavior of Under Confined Square Reinforced Concrete Columns

Cited by 7 publications

References 8 publications

Seismic Behavior of Existing Reinforced Concrete Columns with Non-Seismic Details under Low Axial Loads

Seismic Behavior of Existing Reinforced Concrete Columns with Non-Seismic Details under Low Axial Loads

Performance of aged reinforced concrete columns under simulated seismic loading

Seismic retrofitting of corroded RC columns using advanced composite materials

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