BTRC和BRRC加固混凝土梁的抗冲击性能试验研究

采用落锤冲击试验机开展普通钢筋混凝土梁、玄武岩纤维网增强混凝土（BTRC）和玄武岩纤维筋（BRRC）加固梁的抗冲击性能试验研究，其中，采用未加固钢筋混凝土梁1根、不同面积BTRC和BRRC加固的钢筋混凝土梁各2根。通过分析失效破坏过程、冲击力时程曲线、支座反力时程曲线、位移时程曲线、冲击力—挠度曲线以及支座反力—挠度曲线，对BTRC和BRRC加固钢筋混凝土梁的抗冲击性能进行研究。结果表明，BTRC和BRRC加固层能有效提高试验梁的抗冲击承载力，减小试验梁的最大变形和残余变形；加固方式和配筋率/配网率对试验梁的最大变形和残余变形影响不明显；加固层中纤维网断裂和纤维筋锚固端脱粘会消耗锤头部分动能，使得加固梁的整体变形耗能占比低于普通钢筋混凝土梁。

Anti-explosion and protection of engineering structures

Drop hammer test was carried out on five reinforced concrete (RC) beams which include one as-built RC beam, two reinforced with basalt fiber rebar (BRRC) and two reinforced basalt textile (BTRC) by using drop hammer impact testing machine. The damage process, impact force time-history curve, reaction force time-history curve, deformation time-history curve, impact force-deformation curve and reaction force-deformation curve were analyzed to study the impact characteristics of the RC beams reinforced with BTRC or BRRC. Results indicate that BTRC and BRRC can significantly increase the impact load-carrying capacity, thus decreasing the peak deformation and residual deformation of the beams. The reinforcement layouts and FRP amount have marginal influence on the deformation of the beams. Part of the kinematic energy of the drop hammer can be dissipated due to the fracture of fiber net or debonding of anchor end of fiber reinforcement, resulting in lower internal energy of the reinforced beams in comparison with that of the as-built RC beam.