BFRP筋纤维混凝土梁抗弯试验

摘要

针对传统BFRP筋梁挠度、裂缝较大的特点,提出在BFRP筋梁中掺入短切玄武岩纤维,并完成了3种纤维体积掺量和3种配筋率下的BFRP筋纤维混凝土梁的抗弯试验.在BFRP筋梁中掺入短切玄武岩纤维,可提高梁的开裂荷载,当纤维体积掺量为0.4%时,其开裂荷载提高了60%;掺入短切玄武岩纤维对梁的极限承载力影响不大,极限承载力只随配筋率的增大而增大;掺入短切玄武岩纤维不能有效改善BFRP筋梁的挠度.%According to the characteristics of large deflection and crack of traditional BFRP fiber beams, the study explored the BFRP fiber beams mixed with chopped basalt fiber,and completed the bending test of BFRP reinforced concrete beams under the condition of three kinds of steel fiber volume content and three kinds of reinforcement ratio of steel fiber. It was concluded that the BFRP fiber beams mixed with chopped basalt fibers could improve the cracking load of beam. In the condition of the fiber volume content of 0. 4%,the cracking load increased by 60%. The effect of mixing chopped basalt fibers was small on the ulti-mate bearing capacity of beams,and the ultimate bearing capacity just increased with the increase of reinforce-ment ratio. The chopped basalt fibers could not effectively improve BFRP reinforcement beam deflection.