【摘要】 为了解决现有混凝土结构的耐久性问题并有效控制结构裂缝,利用高韧性水泥基材料(ECC)部分代替受拉区混凝土,采用玄武岩纤维聚合物(BFRP)筋作为受拉纵筋,形成ECC-BFRP筋混凝土梁式复合结构,并通过试验研究复合梁的受弯性能。结果表明:采用不同厚度的ECC代替受拉区混凝土能够明显改善BFRP筋混凝土梁的裂缝宽度和初始裂缝高度;随着ECC厚度的增加,试件的裂缝条数有所增多,且间距变小变密;当ECC厚度达到50 mm时,ECC与混凝土交界面处无措动现象发生,裂缝控制效果明显;但ECC对BFRP筋混凝土梁的开裂荷载和承载能力影响不大。更多还原

【Abstract】 To solve the durability issues of concrete structures and control the structural cracks effectively,a new composite beam was developed using the different thickness of ECC in the tension zone and the BFRP bar as the tensile rebar.Experimental study was carried out to evaluate the flexural performances of these new composite beams.The test results show that the crack width and the first crack height of BFRP bar reinforced concrete structure are limited by the ECC material in the tension zone.Moreover,the crack number in the beam increases and the crack spacing decreases with the increase of ECC thickness.In addition,no dislocation appears on the interface of ECC and concrete materials,and the cracks are controlled effectively,when 50mm thickness of ECC is used in the tension zone of composite beam.However,the ECC material in the tension zone has no significant effect on the cracking load and the ultimate load of BFRP bar reinforced beam.更多还原