BFRP筋的力学性能试验

Experimental Study of Mechanical Properties of the BFRP Bar in Different Diameters

目的研究BFRP筋基本力学性能,找出力学性能的变化规律,为编制FRP材料力学性能试验规范提供依据.方法研制压制式套筒锚具,根据国家标准《GFRP筋拉伸性能实验方法》进行BFRP筋拉伸试验.结果 BFRP筋拉力-变形关系破坏前呈直线,参考钢筋钢丝或钢绞线,可以近似取BFRP筋的可靠强度为其极限抗拉强度的80%.BFRP筋的抗拉弹性模量主要与玄武岩纤维的含量有关,玄武岩纤维含量越高,BFRP筋的抗拉弹性模量越大;BFRP筋直径越大,玄武岩纤维含量越高,故抗拉弹性模量随直径增大而增大.结论与钢筋相比,BFRP筋在抗拉强度、耐腐蚀等方面具有明显的优势,把BFRP筋作为混凝土结构抗拉增强材料是可行的.

The purpose of this paper is to study the basic mechanical properties of BFRP bars with the aim of establishing the testing rule of mechanical properties of the material and finding the mechanical performance.Using the oppressive sleeve anchor developed by the researchers,tensile tests of BFRP bars are carried out according to the national standards of ＂GFRP bar tensile test methods＂.The BFRP bar＇s force-deformation curve is linear before the force-deformation relationship is destroyed,therefore,referring to steel wire or steel cable,the BFRP bar＇s reliable strength is suggested to be approximately 80% of its ultimate tensile strength.The BFRP bar＇s tensile elastic modulus is mainly related to the content of basalt fiber.The tensile elastic modulus increases with the increase of the basalt fiber＇s content and the content increases when the BFRP bar＇s diameter becomes longer,so the BFRP bar＇s tensile elastic modulus increases with the increase of its diameter.Compared with steel,the BFRP bar is obviously superior in the aspects of tensile strength,corrosion resistance,etc,therefore to use the BFRP bar in reinforced concrete structures instead of steel is feasible.