BFRP加固损伤混凝土梁挠度计算方法

发布时间：2018-07-13 08:46

【摘要】：为了准确计算玄武岩纤维增强复合材料(BFRP)加固损伤混凝土梁的挠度,为BFRP加固损伤混凝土梁的设计与施工提供理论依据,按照配筋率不同设计了11片试验梁进行试验,每组试验梁设置不同的BFRP布加固量与加载方法。计算了各试验梁的荷载-挠度曲线,分析了未加固梁、1层BFRP布加固梁、2层BFRP布加固梁在不同初始荷载下的挠度变化规律。给出了BFRP加固损伤混凝土梁跨中挠度的计算公式,对比了挠度计算值与实测值。分析结果表明:BFRP加固混凝土梁的挠度受初始荷载和加固量的影响,有初始荷载的加固梁挠度较无初始荷载的加固梁挠度增大30%~94%,2层BFRP布加固梁的挠度较1层加固梁的挠度增大19%~42%,计算挠度时需考虑BFRP布滞后应变的影响;挠度计算值与实测值的最大差值平均为7.26mm,初始荷载小与配筋率高的试验梁挠度计算值与实测值较为接近,可以用于实际工程计算。
[Abstract]:In order to accurately calculate the deflection of damaged concrete beams strengthened with basalt fiber reinforced composite (BFRP), and to provide theoretical basis for the design and construction of BFRP strengthened damaged concrete beams, 11 test beams were designed according to the different reinforcement ratio. Each group of test beams is equipped with different reinforcement amount and loading method of BFRP cloth. The load-deflection curves of each test beam are calculated, and the deflection changes of the beams strengthened with BFRP sheets are analyzed under different initial loads. In this paper, the formulas for calculating the mid-span deflection of damaged concrete beams strengthened with BFRP are given, and the calculated and measured deflection values are compared. The results show that the deflection of concrete beams strengthened with BFRP is affected by the initial load and the amount of reinforcement. The deflection of the strengthened beam with initial load is increased by 30% than that of the beam without initial load. The deflection of the beam strengthened with two layers of BFRP is increased by 19 / 42 compared with that of the beam strengthened by 1 floor. The effect of lag strain of BFRP cloth should be taken into account when calculating the deflection. The maximum difference between the calculated deflection value and the measured value is 7.26mm, and the calculated deflection value of the test beam with small initial load and high reinforcement ratio is close to the measured value, which can be used in practical engineering calculation.
【作者单位】：东北农业大学水利与建筑学院;哈尔滨工业大学交通科学与工程学院;姆萨巴技术学院建筑工程系;
【基金】：国家自然科学基金项目(51108132)
【分类号】：U445.72

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