Papers by Keyword: Basalt Fiber Reinforced Polymer (BFRP)

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Authors: Sakol Suon, Shahzad Saleem, Amorn Pimanmas
Abstract: This paper presents an experimental study on the compressive behavior of circular concrete columns confined by a new class of composite materials originated from basalt rock, Basalt Fiber Reinforced Polymer (BFRP). The primary objective of this study is to observe the compressive behavior of BFRP-confined cylindrical concrete column specimens under the effect of different number of layers of basalt fiber as a study parameter (3, 6, and 9 layers). For this purpose, 8 small scale circular concrete specimens with no internal steel reinforcement were tested under monotonic axial compression to failure. The results of BFRP-confined concrete specimens of this study showed a bilinear stress-strain response with two ascending branches. Consequently, the performance of confined columns was improved as the number of BFRP layer was increased, in which all the specimens exhibited ductile behavior before failure with significant strength enhancement. The experimental results indicate the well-performing of basalt fiber in improving the concrete compression behavior with an increase in number of FRP layers.
Authors: Li Hui Qin, Zong Lin Wang, He Wu, Lan Zhang
Abstract: This paper presented the results of testing reinforced concrete beams strengthening with the BFRP sheets. Five specimens were cast and tested. All specimens were 2600 mm total span with a cross section of 150mm width and 250mm depth. Out of the specimens, two specimens were designed as reference specimens. The rest specimens were repaired with the BFRP sheets. The variables examine in the experiment were the longitudinal tensile reinforcement ratio, the different layers of the BFRP sheets and the anchoring measures of BFRP sheets. All specimens were tested under simply supported condition. 3D nonlinear finite element (FE) numerical models by ANSYS10.0 software were conducted to accurately predict the ultimate bearing capacity and response of reinforced concrete specimens strengthening with BFRP sheets subjected to four-point bending loading. The nonlinear constitutive material properties of concrete and steel reinforcement were considered in the finite element model. The results of the FEM simulation were compared with that of the experimental specimens. The results showed that it was significantly effective for the flexural capacity of the BFRP sheet-bonded reinforcement in tensile zone for reinforced concrete beams. Moreover, it implied excellent results on the stiffness of the reinforced concrete beams. The flexural strength enhancement of the reinforced concrete beams strengthening with the BFRP sheets varied between 19% ~ 44% over the control beam. This study further identified that the BFRP sheet technique significantly enhanced the stiffness and flexural capacity of reinforced concrete beams.
Authors: Zhen Lei, Yong Wang, Jun Tong Qu
Abstract: The externally bonded FRP is an effective strengthening technique, which is mainly verified through laboratory tests. In this paper, numerical analysis models were established in ABAQUS respectively based on an experimental scaled three-story confined masonry structures before and after strengthened with BFRP. Then dynamical analysis considering material nonlinearity, geometric nonlinearity and contact nonlinearity was carried out on these two models. Here, representative volume element method was used to simplify the simulation of masonry. Besides, concrete damage plasticity model was adopted to simulate the structural damage and failure process. The reliability and accuracy of nonlinear dynamic finite analysis were validated by comparing the numerical simulation results and experimental results in terms of dynamic property, displacement and acceleration response and the maximum base shear.
Authors: Xin Jian Xu, Li Juan Li, Wen Chao Zhou, Ming Min, Feng Liu
Abstract: This paper presented the on-site test results on two-way RC slabs with and without FRP-strengthening. Two slabs strengthened with BFRP, one slab strengthened with CFRP and one slab without strengthening were tested on a practical engineering structure being repaired. The effects of different load cases on mid-span deflection, distribution of stresses around the steel bars at the top and bottom of slabs were analyzed.
Authors: Zhen Lei, Jun Tong Qu, Yong Wang
Abstract: This in-plane behavior of two one-half scale reinforced concrete (RC)-brick masonry walls with opening before and after retrofitting with basalt fiber reinforced polymer (BFRP) is investigated. One specimen was served as the reference without any strengthening scheme; another one was first tested to the severely damaged level, and then retrofitted with BFRP in a mixed strengthening configuration on two sides. Both of these specimens were tested under in-plane constant vertical load and cyclic lateral load. Test results are analyzed in terms of failure mode, maximum shear strength, ultimate drift, energy dissipation and equivalent viscous damping coefficient, which indicated that the use of BFRP composite material can effectively improve both the strength and deformation capacity of the damaged masonry wall as well as changing failure mode and maintaining the wall’s integrity.
Authors: Hai Liang Wang, Xing Long Yuan
Abstract: The experiment study on flexural behavior was carried out on six damaged RC beams strengthened by BFRP and two common beams by the way of three point loading method. The failure characteristics, flexural capacity, deflection, strain distribution and the influence of the different layers of BFRP was observed and analyzed. Results show that the bearing capacity of the damaged RC beams strengthened with BFRP is enhanced with the layers increasing, and the relationship is not linear; the bearing capacity of the specimen increased by 79.98% when five layers are pasted; with the increase of paste layers of BFRP, the peel failure mode is more likely to occur.
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