Flexural behavior of GFRP-reinforced concrete continuous beams
Loading...
Date
2016-08-12
Authors
Rahman, S. M. Hasanur
Journal Title
Journal ISSN
Volume Title
Publisher
American Society of Civil Engineers
Abstract
In this study, a total of twelve beams continuous over two spans of 2,800 mm each were constructed and tested to failure. The beams were divided into two series. Series 1 included six T-beams under symmetrical loading, while Series 2 dealt with six rectangular beams under unsymmetrical loading conditions. In Series 1, the test variables included material type, assumed percentage of moment redistribution, spacing of lateral reinforcement in flange, arrangement of shear reinforcement, and serviceability requirements. In Series 2, three different loading cases were considered, I) loading both spans equally, II) loading both spans maintaining a load ratio of 1.5 and III) loading one span only. Under the loading case II, the parameters of reinforcing material type, assumed percentage of moment redistribution and serviceability requirements were investigated.
The test results of both series showed that moment redistribution from the hogging to the sagging moment region took place in GFRP-RC beams which were designed for an assumed percentage of moment redistribution. In Series 1, the decrease of the stirrups spacing from 0.24d to 0.18d enhanced the moment redistribution percentage. Also, decreasing the spacing of lateral reinforcement in the flange from 450 to 150 mm improved the moment redistribution through enhancing the stiffness of the sagging moment region. In Series 2, the unsymmetrical loading conditions (loading case II and III) reduced the moment redistribution by reducing flexural stiffness in the heavily loaded span due to extensive cracking. Regarding serviceability in both series, the GFRP-RC beam designed for the same service moment calculated from the reference steel-RC beam, was able to meet the serviceability requirements for most types of the structural applications.
Description
Keywords
Moment Redistribution; Deformability; Serviceability; T-section; Continuous beams; Fibre Reinforced Polymer (FRP); Unbalanced loading
Citation
Rahman, S. M. H, Mahmoud, K., and El-Salakawy, E. (2016). “Behavior of Glass Fiber-Reinforced Polymer Reinforced Concrete Continuous T-Beams.” ASCE, Journal of Composites for Construction, http://dx.doi.org/10.1061/(ASCE)CC.1943-5614.0000740