新型玄武岩FRP筋加固结构性能研究

Experimental Study on Reinforcement Structural with New Basalt FRP Tendons

针对钢筋锈蚀在工程加固领域中带来的严重安全生产问题，应用具有极强耐腐蚀性的新型玄武岩增强塑料fBFRP）筋，内嵌加固混凝土梁结构。制作7根混凝土梁进行静力加载试验，研究采用不同直径、加固数量的BFRP筋加固试件的受力性能，对其受力过程、破坏形态、承载力、变形和裂缝发展情况进行分析。结果表明，采用新型BFRP筋对混凝土结构进行加固可以有效增加结构的开裂载荷与极限载荷，开裂载荷提高73．88％-165．01％，极限载荷提高62．16％-72．90％；且有效减小加固构件的变形，延缓裂缝开展。但并不是加固筋材数量越多加固效果越好。BFRP筋可以推广应用在易受腐蚀地区代替钢筋进行结构加固工作。

Aiming at the serious production safety problems caused by corrosion of steel in the field of engineering reinforcement , new basalt fiber reinforced plastics （BFRP） tendons was applied to reinforce concrete beams. Seven concrete beams under monotonic loads were tested. Behavior of concrete beams strengthened with different diameter and number of BFRP tendons were studied. Based on tested values of concrete beams strengthened with new BFRP tendons, the stressing process, failure capacity, flexural capacity, deformation and crack distribution were studied. The test shows that strengthening technique using new BFRP tendons bonding in concrete cover can enhance the first-crack load and steel-yielding load of beams compared with the ordinary beam, the crack loads increased by 73.88% to 165.01%, the limit bearing capacities increased by 62.16% to 72.90%. The BFRP tendons can limit the crack width all the way up to failure and reduces deformation of reinforcement effectively. The reinforcement effect of the concrete beams is not better than the concrete beams strengthened with more BFRP tendons. BFRP tendons can be widely used in structure reinforcement instead of steel in susceptible to corrosion area.