## 1 Introduction  
Many bridges serve under harsh environmental and mechanical loading conditions. Due to population growth and urbanization, traffic flow has increased substantially over the last few decades, while vehicle loads have gradually increased. Accordingly, many bridges have become structurally deficient or obsolete [1]. Thus, deploying various strengthening schemes to extend the service life of bridges has attracted greater interest [2] and has become a major challenge for modern civil engineering [3].  
Owing to simple construction and relatively lower cost, T-section beams have been extensively used in highway bridges around the world. In service, such T-section beams can be subjected to chloride ions ingress, carbonization and moisture intrusion, ultimately causing corrosion of the reinforcing steel, cracking, spalling and delamination. Such damage mechanisms compromise the load carrying capacity of the T-section beams and shortening the service life of the bridge. Previous studies indicated that strengthening these T-section beams is generally more economical and sustainable compared to its replacement [4]. Thus, strengthening T-section beams has become a primary concern in improving the structural performances of bridges with T-section beams.  
In recent years, using fiber-reinforced polymer (FRP) materials for strengthening concrete structures experienced very rapid growth around the world [5], particularly in cases of design code changes,deficient design, construction flaws, or structural degradation due to environmental exposure, natural hazards or excessive loading [6]. Externally bonded FRP reinforcement has proven especially effective for strengthening RC beams owing to its light-weight, excellent durability, and rapid installation. Yet, premature failure for instance due de-bonding can limit the system effectiveness, leading to possible brittle modes that can deter designers from exploring the full potential of this material [7].  
In FRP-strengthened beams, failure may occur due to beam shear, flexural compression, FRP rupture, FRP debonding, or concrete cover ripping [8; 9]. CFRP was used for strengthening RC structures in lieu of traditional steel plate strengthening techniques. For instance, [PERSON] et al. [10] and [PERSON] et al. [11] studied the flexural strength of RC beams with prestressed CFRP rods experimentally and analytically. [PERSON] et al. [12] reported experimental studies on the flexural behavior of RC beams strengthened by CFRP strips. [PERSON] et al. [13], [PERSON] and [PERSON] [14] and [PERSON] et al. [15] investigated the flexural and shear strength of beams or girders strengthened with CFRP. Most existing experimental and analytical studies focused on the structural performance of RC members with externally bonded CFRP sheets or strips. However, there is currently little published work on the anchoring for RC T-Section beams strengthened with CFRP sheets, along with a lack of studies on the influence of CFRP U-wrap spacing on anchorage and mechanical properties. Comparative studies on the bonding efficiency of this strengthening technique are still limited. Additionally, rational and accurate analytical models considering the above parameters are scarce.  
The present study reports the findings of a test program on eight RC T-section beams reinforced with CFRP sheets tested to failure under two-point loading. The flexural performance of the T-section beams is explored, and the effects of influential parameters, including concrete compressive strength, reinforcing steel ratio, thickness of the strengthening material, and spacing of the strengthening U-wraps are discussed and analyzed. Based on the test results, a predictive analytical model was developed and recommendations for selection of CFRP sheets on T-section beams are formulated.