Title: Effective Moment of Inertia of Concrete Beams Prestressed with Aramid Fiber-Reinforced Polymer (AFRP) Tendons

Author(s): Y.J. Kim

Publication: Symposium Paper

Volume: 264

Issue:

Appears on pages(s): 147-162

Keywords: aramid; beam; deflection; fiber-reinforced polymer (FRP); modeling; moment of inertia; prestress; serviceability; tendon.

DOI: 10.14359/51663265

Date: 10/1/2009

Abstract:
This paper presents detailed investigations into the effective moment of inertia for concrete beams prestressed with aramid fiber reinforced polymer (AFRP) tendons, including an assessment of the existing predictive methods. A three-dimensional nonlinear finite element analysis (FEA) model is developed, based on three different experimental programs reported in literature, to predict the effective moment of inertia of concrete beams prestressed with AFRP tendons. The investigation includes the effect of different sectional properties and various prestressing levels in the tendons. The solved FEA models are compared with several predictive models. The prestressing level in the AFRP tendons significantly influences the transition of the moment of inertia from uncracked section (Ig) to fully-cracked section (Icr) . The existing design standards may not be applicable for beams having a large Ig/Icr ratio (typically over 50) with a low level of prestress (e.g., below 40% ultimate).