Flexural Behavior of CFRP Precast Prestressed Decked Bulb T -Beams

Abstract

This study introduces an innovative scheme of bridge superstructure for expedited construction, improved serviceability, and extended life span. The new bridge superstructure is assembled from precast prestressed decked bulb T-beams reinforced and prestressed with corrosion-free fiber-reinforced polymer (FRP) materials. An experimental investigation accompanied by analytical and numerical simulations was developed to evaluate the performance of the newly developed beams. Through the experimental investigation, three single decked bulb T-beams were constructed and tested to failure. The first beam, served as a control beam, and was prestressed and reinforced with conventional steel strands and reinforcing bars. The second and third beams were prestressed and reinforced with carbon-fiber cable composite (CFCC) strands and carbon-fiber-reinforced polymer (CFRP) tendons, respectively. The investigation revealed that the performance of beams reinforced with CFRP tendons or CFCC strands was comparable with the performance of the control beam at both service and ultimate limit states. All three beams exhibited high load-carrying capacity with large corresponding deflection and fair amount of absorbed energy before failure. The study showed that the corrosion-free FRP-reinforced decked bulb T-beams can be safely deployed in construction to enhance the performance and extend the life span of bridge superstructures.

Ponašanje predgotovljenih betonskih greda prednapetih pomoću CFRP užadi

“…It was also concluded that the effect of prestress at transfer and concrete strength should be considered while estimating transfer length. Grace et al [12] conducted an experimental and analytical research to study flexural behaviour of decked bulb T-beams reinforced and prestressed with different kinds of FRP materials. Test results showed that the performance of CFRP tendons or CFCC strands reinforced beams was comparable to that of the control beam, prestressed and reinforced with conventional steel strands and bars, at both service and ultimate limit states.…”

Performance of Carbon-Fiber-Reinforced Polymer Stirrups in Prestressed-Decked Bulb T-Beams

“…For example, Beam C100-S6-4 is a beam prestressed longitudinally with CFCC strands to a level of 100 kip, provided with steel stirrups at spacing of 6 in., and loaded at a distance equal to 4d from the support, where d is the effective depth of the beam. Detailed prestressing, construction, and curing techniques of the beams can be found in Grace et al (2012a) and Rout (2013). The concrete compressive strength averaged 44 MPa (6.4 ksi) at the time of prestress transfer and 62 MPa (9 ksi) after 28 days.…”

“…Although there is a higher initial cost of construction using FRP materials as a primary reinforcement, life-cycle cost analysis has proven that the overall cost, including maintenance and replacement costs, are much lower (Eamon et al 2012;Grace et al 2012b). Numerous studies have addressed structures internally reinforced or prestressed with longitudinal CFRP reinforcement (Grace et al 2012a(Grace et al , 2013a. However, the use of CFRP materials as shear reinforcement in the form of stirrups has not been thoroughly evaluated.…”

“…The current manuscript represents part III of a series of publications aiming at developing comprehensive design guidelines for highway decked bulb T-beams with CFRP reinforcement. Parts I and II (Grace et al 2012a(Grace et al , 2013b addressed the flexural performance, whereas this part addresses the shear performance. It aims at filling some of the gaps in the shear design guidelines for members prestressed/reinforced with carbon fiber composite cable (CFCC) strands and stirrups.…”

Study on Corrosion Characteristics of Concrete‐Filled CFRP‐Steel Tube Piles under Hygrothermal Environment

“…e CFRP-CFST pile of high-pile wharfs has three corrosion zones: the atmospheric zone, the dry and wet alternating zone, and the underwater zone. Oxygen and water are indispensable for the occurrence and development of corrosion [4][5][6][7]. e underwater zone lacks enough oxygen, and the water supply in the atmospheric zone is insufficient.…”