Evaluation of the Effects of Orientation and Coverage Areas of FRP Lamination Bonded with Two-Way RC Slabs – A Modular Approach

Abstract

Many researchers have proposed different schemes of fiber reinforced polymer (FRP) wrapping to strengthen the Reinforced Concrete (RC) slab. However, the ideal system for FRP laminations is not readily available. A modular approach for strengthening of RC slabs (especially two-way slab) needs to be developed with respect to orientations and coverage area of FRP sheets in order to figure out the effective strengthening system. This paper describes the experimental study carried out to explore the effects of fiber reinforced polymers in different orientation and coverage areas to strengthen the structural members. Three systems of laminates have been used to strengthen the RC slabs using two types of fibers, namely carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP) composite. The systems are classified with respect to the orientation of FRP sheets such as edge, corner and center wrapping. Each system has three proportions of FRP coverage area in the order of 25%, 35%, and 45%. A set of fifty-four slabs were fabricated and tested at the rate of three specimens for each variant. The performance of the flexural strength of two-way RC slabs with different strengthening systems has been evaluated and compared. It shows that all the systems of strengthening are effectively enhancing the flexural strength of two-way RC slabs. The extent depends on the system orientation and coverage area of the FRP sheet. The higher-order performance is noticed when the FRP lamination has higher contact with the slab area and with closer proximity to the loaded area.

Enhancing the flexural load capacity of the reinforced concrete simply supported slabs using damaged tires strips (DTS)

“…Increasing the flexural load values due to the DTS were compared with the corresponding values when using CFRP for one-way slab models obtained by Omar and Rajai (2020) as well as the results of Rami, Jamal and Hasan (2016). On the other hand, results of the increasing in flexural load capacity of the two-way slab models obtained in the present study were compared with results obtained by Dina (2019), and Balamurugan and Viswanathan (2020), as listed in Table 4.…”

The Experimental Behavior of the CFST Column and Beam Externally Bonded by CFRP Strips

“…Balamurugan and S [13] presented the carbon fiber reinforced polymer affected structural members in various orientations and coverage areas. Three laminate methods with two types of fibers, CFRP and GFRP were used to stabilize the RC slabs.…”

Post Fire Behavior of Structural Reinforced Concrete Member (Slab) Repairing with Various Materials

“…Zhou & Wang (2019) concluded that when an existing structure begins to deteriorate or needs to be altered so that it can no longer fulfill its intended function, strengthening concrete structures must be taken into consideration, as must the loads while strengthening and the damaged condition of existing materials [1]. Balamurugan et al (2020) investigated all failure modes must be assessed before undertaking structural strengthening of concrete. When a structure is strengthened for flexure, the result may be shear failure rather than the expected improvement in load-bearing capacity [2].…”

“…Balamurugan et al (2020) investigated all failure modes must be assessed before undertaking structural strengthening of concrete. When a structure is strengthened for flexure, the result may be shear failure rather than the expected improvement in load-bearing capacity [2]. Bezerra et al (2019) investigated the impact of high temperatures on the mechanical characteristics of concrete reinforced with steel fibers of different aspect ratios.…”