Pultruded Glass Fiber Reinforced Polymer (GFRP) sections are used as beams and columns in framed structures nowadays. The utility of open sections in beam-to-column joints is extensively studied by researchers, but studies on closed sections are limited. The most commonly used connections in FRP sections are bolted connections, bonded connections, and hybrid connections. Studies are conducted in beam-to-column joints using an additional connecting element like cleat, cuff, and sleeve in addition to bolt/threaded rods and adhesives. A direct connection between the beam and column without any additional attachment is studied here. GFRP box sections are used as columns and two parallel flanged sections placed back-to-back are used as beams. A 2D interior beam-to-column joint with a direct connection between the members is studied under monotonic loading at the free ends. This study compares the mechanical behaviour of through-bolted connections using GFRP threaded rods and stainless-steel (SS) threaded rods. It is followed by a study on adhesively bonded connections and hybrid connections. When compared to the GFRP threaded rod, connection using the SS threaded rod performed well in terms of rotational stiffness and ultimate load-carrying capacity. Hybrid connection showed 2.97 times rotational stiffness and 1.22 times load carrying capacity compared with SS threaded rod connection. Hybrid connections ensure a safer and stronger connection design. Apart from rotational stiffness, Load–Deflection characteristics, and Failure modes are also studied.