Optimization for partially prestressed high strength concrete girders

Document Type

Conference Proceeding

Publication Date

2-2023

Abstract

Partially prestressing acts as an intermediate design alternative between fully prestressed and conventional reinforced concrete through relaxing the allowable concrete tensile stresses. Consequently, this results in lower prestressing forces, which subsequently reduces prestressing steel and the overall cost. The adoption of high-strength concrete (HSC) with partial prestressing improves both the economic and durability aspects. However, limited research has been conducted to investigate the effect of HSC on the serviceability requirements of partially prestressed girders. This paper presents a numerical investigation into the behavior of such girders under quasi-static loading. The presented numerical model was validated against experimental results in terms of deflection and cracking performance at different loading stages. Then it was conducted in a parametric study to assess the effect of concrete compressive strength, prestressing force, and non-prestressed reinforcement ratios on the behavior of the partial prestressed girders using full-scale sections. The proposed study presents different design optimization regimes for HSC partially prestressed girders.

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