基于竹纤维和钢丝网增强的玄武岩筋混凝土梁抗弯延性试验研究

Experimental Study on the Flexural Ductility of BFRP Bar Concrete Beams With Bamboo Fiber and Steel Wire Mesh

为研究竹纤维和钢丝网对玄武岩纤维筋混凝土梁抗弯延性的影响,该研究以竹纤维长度(0 mm、30 mm、45 mm)及钢丝网布置范围(无、1/2最大弯矩点间布置、全梁段布置)为变量,对7根基于竹纤维和钢丝网增强的玄武岩纤维筋混凝土梁进行了弯曲破坏试验,对其初裂荷载、裂缝开展、极限荷载、变形情况等进行了检测.通过试验数据分析了纤维长度和钢丝网布置范围对试件抗裂、抗变形性能的影响;借助函数模型得到7根试验梁的等效屈服点,计算出了试件的延性系数.结果表明竹纤维和钢丝网的掺入使玄武岩纤维筋混凝土梁的开裂荷载提高了12%~68%,减小了裂缝分布间距及长度发展速度,同等荷载下试验梁的变形减小,延性系数增大了1.58%~31.75%.

To study the effects of bamboo fiber and steel wire mesh on the flexural ductility of basalt fiber reinforced polymer(BFRP)bar concrete beams,7 BFRP bar concrete beams with bamboo fiber and steel wire mesh were tested with different bamboo fiber lengths(0 mm,30 mm and 45 mm)and different steel wire mesh layout ranges(0,1/2 maximum bending moment point layout and full beam length layout).The flexural failure tests of the 7 beams were carried out,and the initial crack loads,the crack developments,the ultimate loads and the deformations were detected.The effects of the fiber length and the wire mesh layout range on the crack resistance and the deformation resistance of the specimens were analyzed based on the test data.With the function model,the equivalent yield points of the 7 test beams were obtained,and their ductility coefficients were calculated.The results show that,the addition of bamboo fiber and steel wire mesh increases the cracking loads of BFRP bar concrete beams by 12%~68%,decreases the crack spacings and the crack length development speed,reduces the test beam deformation under the same load,and increases the ductility coefficient by 1.58%~31.75%.