Compressive performance of AFRP reinforced laminated bamboo stub columns

Abstract

Engineered bamboo construction can be affected by natural defects, insects, corrosion, etc., which will result in damaging the mechanical properties of structural components. However, traditional reinforcement methods such as setting steel supports and increasing the cross-sectional area of components may cost a lot and cause a negative influence on the appearance of building. Many engineering practices and research works show that applying FRP (Fiber Reinforced Polymer/Fiber) sheet is an economical and efficient method for reinforcing and retrofitting building structures. Therefore, the compressive performance of AFRP (Aramid Fiber Reinforced Polymer/Fiber) reinforced laminated bamboo lumber (LBL) stub columns was studied in this paper. Through 6 groups (3 replicates for each group) of stub columns with 6 different cloth ratios, the influence of AFRP on the failure pattern and mechanical properties of bamboo columns was explored. The test results showed that AFRP could effectively restrain the lateral deformation and improve the mechanical behavior of LBL columns. With the increase in cloth ratio, the ultimate strength and elastic modulus increased linearly in general, while the Poisson's ratio gradually decreased. The reduced modulus of reinforced columns in the elastoplastic stage increased up to 161.31% compared with normal columns. Although the ductility of LBL columns laterally wrapped by AFRP was greatly improved, the initial stiffness, yield point and turning points between elastoplastic stage and plastic stage basically remained unchanged in contrast to unreinforced columns. Based on the test results, an empirical equation considering the cloth ratio was proposed to calculate the ultimate strength of AFRP reinforced LBL columns, using 'Lam and Teng' model. In addition, a simplified equation was also proposed to calculate the compressive strength of reinforced LBL columns derived from Mises yield criterion. The results of this work can be a reference to promote the application of strengthening and retrofitting engineered bamboo structure with FRP.

A Review on the Mechanical Behaviour of Bamboo Reinforced Concrete Beams

“…With the invention of bamboo composites, such as laminated bamboo lumber [82][83][84][85][86][87], glubam [88][89][90][91][92], parallel strand bamboo [93][94][95][96][97], and their combinations with AFRP, CFRP [98,99], and other materials, the possibility of using bamboo as reinforcement for concrete is significantly expanding. Multiple studies have been done on new types of bamboo-based and concrete composites, such as engineered bamboo-concrete sandwich panels, bamboo particle concrete, bamboo fibre concrete, bamboo tube grid concrete panels, etc., showing wide possibilities of utilization of bamboo variations in composites with concrete [100,101].…”

Mechanical Properties of Aramid Fiber Fabrics and Composites Enhanced by Phthalic Anhydride Catalyzed with Anhydrous Aluminum Chloride

“…Aromatic polyamide fiber, abbreviated as aramid fiber (PPTA), is the second-generation high-performance reinforcement fiber following carbon fiber [1][2][3]. As one of the three major high-performance fibers in the world, aramid fiber possesses superior properties, such as low density, high tensile strength, high modulus, excellent thermal stability, abrasion resistance, chemical corrosion resistance, and outstanding ballistic performance [4][5][6][7]. Consequently, it is widely used in the manufacturing of advanced composite materials for aerospace, civil engineering, armored protection, and other fields [8][9][10][11][12][13].…”

Evaluation on the axial compression mechanical properties of short BFRP laminated bamboo lumber columns

“…Few studies evaluated FRP reinforced short LBL columns. Hong [63], Wang [64] and Li [65] carried out axial compression experiments on FRP reinforced short LBL columns, studied the ultimate strength of FRP reinforced short LBL columns, but did not propose a universal model of stress-strain model. Herein, the effect of BFRP on the axial compressive performance of BFRP reinforced short LBL columns was investigated.…”