Abstract
The use of new developed high-strength steel in concrete members can reduce steel bar congestion and construction costs. This research aims to study the behavior of concrete columns reinforced with new developed high-strength steel under eccentric loading. Ten reinforced concrete columns were fabricated and tested. The test variables were the transverse reinforcement amount and yield strength, eccentricity, and longitudinal reinforcement yield strength. The failure patterns were compression and tensile failure for columns subjected to small eccentricity and large eccentricity, respectively. The same level of post-peak deformability and ductility could only be obtained with a lower amount of transverse reinforcement when high-strength transverse reinforcements were used in columns subjected to small eccentricity. The high-strength longitudinal reinforcement improved the bearing capacity and post-peak deformability of the concrete columns. Furthermore, three different equivalent rectangular stress block (ERSB) parameters for predicting the bearing capacity of columns with high-strength steel are discussed based on test and simulated results. It is concluded that the China Code GB 50010-2010 overestimates the bearing capacity of columns with high-strength steel, whereas the bearing capacities computed using the America Code ACI 318-14 and Canada Code CSA A23.3-04 agree well with the test results.
Highlights
IntroductionThe use of high-strength steel bars in the construction industry has prompted extensive research in this area
Over the last decade, the use of high-strength steel bars in the construction industry has prompted extensive research in this area
These results demonstrate the beneficial effect of transverse reinforcement amount on the behavior of the columns under eccentric loading on the basis of deformability and ductility and show that the confinement effect of the transverse reinforcements is more important in columns loaded to small eccentricity (e = 80 mm) than columns subjected to large eccentricity (e = 180 mm)
Summary
The use of high-strength steel bars in the construction industry has prompted extensive research in this area. High-strength steel bars have the advantage of lowering reinforcement congestion and construction costs, especially in high-rise and special buildings. The continuous development of steel smelting technology has produced new high-strength steel The new developed high-strength steel has a linear pre-yield behavior, obvious yield plateau and comparatively good ductility, while ultra-high-strength reinforcing bars have a high yield strength, but no yield plateau and poor ductility. The new developed high-strength steel (with its altered mechanical properties) has an obvious effect on the performance of concrete members
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