Two-Dimensional Modeling of Thermomechanical Responses of Rectangular GFRP Profiles Exposed to Fire

Abstract

In the past three decades, one-dimensional (1D) thermal model was usually used to estimate the thermal responses of glass fiber-reinforced polymer (GFRP) materials and structures. However, the temperature gradient and mechanical degradation of whole cross sections cannot be accurately evaluated. To address this issue, a two-dimensional (2D) thermomechanical model was developed to predict the thermal and mechanical responses of rectangular GFRP tubes subjected to one-side ISO-834 fire exposure in this paper. The 2D governing heat transfer equations with thermal boundary conditions, discretized by alternating direction implicit (ADI) method, were solved by Gauss-Seidel iterative approach. Then the temperature-dependent mechanical responses were obtained by considering the elastic modulus degradation from glass transition and decomposition of resin. The temperatures and midspan deflections of available experimental results can be reasonably predicted. The overestimation of deflections could be attributed to the underestimation of bending stiffness. This model can also be extended to simulate the thermomechanical responses of beams and columns subjected to multiside fire loading, which may occur in real fire scenarios.

Repair of Fire-Damaged Reinforced Concrete Members with Axial Load: A Review

“…Fiber-reinforced polymer (FRP) has been increasingly used in civil engineering applications due to its advantages of its excellent strength to weight ratio and anti-corrosion ability [60][61][62][63][64][65][66]. As a mature technology, FRP sheets were bonding onto the surface of RC columns to restore the ultimate load capacity due to the confinement effect [67][68][69][70][71][72][73][74][75].…”

Experimental Study on Seismic Strengthening of Confined Masonry Walls Using RPC

“…Although additional transverse stiffeners were found to be able to restrain the local buckling phenomenon to some extent [10,11], they exerted no significant influence on improving the overall strengthening performance. e effectiveness of fiber-reinforced polymer technique for reinforced concrete members has been profoundly investigated [12][13][14]. is technique was also introduced to masonry members [15,16] and overcomes some of the drawbacks of the aforementioned methods.…”

Experimental Study and Mixed‐Dimensional FE Analysis of T‐Rib GFRP Plate‐Concrete Composite Bridge Decks

“…Compared with the FRP structure, the FRP-concrete composite/hybrid structures have more advantages, such as preventing the buckling phenomena of pultruded FRP profiles [1,2], improving the usage of FRP profiles strength [3], reducing material costs [4], and improving stability, flexural stiffness, and bearing capacity of structures [5]. Furthermore, the FRP profiles/plates can act as a temporary formwork when pouring the cast-in-place concrete [6].…”

“…e finite element method (FEM) is widely used to analyse the structural performance of FRP-concrete composite structures, due to the better accuracy and feasibility of FEM than the other analysis methods (e.g., Euler-Bernoulli beam theory [33], Timoshenko beam theory [3,15,21,34], and orthotropic plate theory [4]). According to element types used in simulation composite structures, the FEA model can be divided into three types, namely, FEA model with truss elements, shell elements, and solid elements, respectively.…”

“…(1) e FEA model with truss elements was the two-dimensional truss elements adopted to simulate FRP pro les/plates and concrete [35]. (2) e FEA model with shell elements was the two-dimensional shell elements and three-dimensional solid elements adopted to simulate FRP pro les/plates and concrete [3,4,8,15,22,[36][37][38], respectively. (3) e FEA model with solid elements was the three-dimensional solid elements adopted to simulate concrete and FRP pro les/plates [34,[39][40][41].…”