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通过对3根配置高强度碳纤维棒高炉渣混凝土梁和3根高炉渣钢筋混凝土梁正截面受弯性能进行对比试验,发现配置碳纤维棒主筋的高炉渣混凝土梁的正截面受弯性能较高炉渣钢筋混凝土梁略有下降,主要表现为:除1根配置碳纤维棒主筋的高炉渣混凝土梁破坏荷载能达到设计要求外,其余两根梁破坏荷载分别能达到设计荷载的99%和95%;梁体裂缝发展明显更快,且裂缝宽度更大,碳纤维棒拉断时,梁体裂缝基本在1.4mm左右。针对裂缝超宽的问题,提出在梁侧增设腰筋的方式以限制裂缝的开展,并进行了理论分析和计算。经试验验证,该方法能有效抑制裂缝的发展,减小跨中挠度,能满足设计和使用要求。
By comparing the flexural behavior of three sections of high strength carbon fiber reinforced plastic blast furnace slag beam and three blast furnace slag reinforced concrete beams, it is found that the normal section of the blast furnace slag concrete beam with carbon fiber reinforced bars is higher in bending performance. The concrete beam is slightly decreased, mainly as follows: except for the failure load of one blast furnace slag concrete beam with the main reinforcement of carbon fiber rod can meet the design requirements, the destruction load of the other two beams can reach 99% and 95% of the designed load respectively; The crack development is obviously faster and the crack width is larger. When the carbon fiber rod is pulled off, the crack of the beam body is about 1.4mm. Aiming at the problem of wide crack, a method of adding waist bars on the side of the beam is proposed to limit the development of cracks, and the theoretical analysis and calculation are given. The experimental verification, the method can effectively inhibit the development of cracks, reduce the mid-span deflection, to meet the design and use requirements.