Proposed Confinement Steel Design within Critical Region for Limited Ductile High-Strength Reinforced Concrete Columns

Abstract eng:
In high seismic risk region, the design of high-strength reinforced concrete (HSRC) columns in fully ductile buildings or bridges requires a large amount of confinement reinforcement within the critical region to avert brittle failure. However, in regions of low to moderate seismic risk, the design of these columns, which have a smaller seismic resistance demand, could be designed for reduced limited ductility. The advantage of this is that it saves considerably the construction cost and alleviates steel congestion problem within the beam-column or pier - pile cap joints. In a previous study conducted by the authors, an equation was proposed for the confinement steel design within the column’s critical region for achieving limited ductile behaviour. This paper investigates experimentally the flexural ductility of three HSRC columns containing the proposed confinement steel content within their critical region and subjected to various compressive axial load levels. By comparing with fully ductile HSRC columns, it is seen that limited ductility HSRC columns can be confined effectively by less amount of confinement steel over a shorter critical region length. Lastly, some simplified design guidelines for limited ductility HSRC columns are proposed.

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