BFRP复合材料加固老旧砌体砖墙的平面内受力性能

In-Plane Mechanical Behavior of Ancient Masonry Walls Strengthened by BFRP Composite Material

摘要: 本文研究了玄武岩纤维复合材料(Basalt Fiber Reinforced Polymer, BFRP)加固老旧砌体砖墙平面内受力性能，考虑了无筋不开洞、带构造柱开洞、带构造柱不开洞三种砖墙形式。通过3片未加固砖墙和3片纤维直接加固砖墙在低周往复水平加载作用下的抗震性能试验，得到各试件的破坏特征，研究BFRP加固前后砖墙的滞回曲线和骨架曲线、极限抗剪和变形性能、承载力及刚度退化特性、变形恢复能力、耗能性能及纤维复合材料应变。研究结果表明：粘贴BFRP复合材料可以有效地提高不同形式老旧砌体砖墙的极限抗剪强度和变形能力，且后者提高幅度远大于前者；纤维加固试件的承载力及刚度退化明显减缓，耗能能力增强，变形恢复能力改善，进而延长原结构的使用寿命，保证结构抗震能力。

Abstract: This paper evaluates the mechanical behavior of ancient masonry walls strengthened by Basalt Fiber Reinforced Polymer (BFRP) composite material. Three kinds of masonry walls (unreinforced walls without opening, confined walls with or without opening) were considered. Based on the seismic performance tests of three masonry walls without any strengthening scheme and three walls strengthened with BFRPP directly under in-plane increasing cyclic lateral loading and constant vertical compression loading, failure characteristics of each specimen was described. The hysteretic curves and skeleton curve, ultimate shear strength and displacement, bearing capacity and stiffness degradation characteristics, deformation recovery capacity, energy dissipation be-havior and FRP strain were compared and analyzed. The results show that the strengthening technique of bonding BFRP sheets can effectively enhance the ultimate shear strength and defor-mation capacity, and the improvement level of the latter is much larger than that of the former. FRP strengthened ancient masonry walls show a distinct slowdown in bear capacity and stiffness degradation, which also have better energy dissipation capacity as well as deformation recovery capacity. This technics can eventually extend the service life of the original masonry structure and guarantee the aseismic ability.