废弃纤维再生混凝土梁受力性能试验研究
发布时间：2018-11-01 20:20
【摘要】：为了初步地了解废弃纤维再生混凝土梁的受剪和受弯性能,本文分别对12根和14根不同废弃纤维掺入量及不同再生骨料取代率下的矩形截面梁进行了斜截面受剪和受弯性能试验。废弃纤维的掺入量的体积分别为0.08%、0.12%、0.16%,纤维长度分别为12mm、 19mm、30mm、再生骨料取代率分别为0、50%、100%。梁截面尺寸分别为2300mm×200mm ×300mm和2250mm×150mm×300mm。本文对废弃纤维再生混凝土梁在斜截面以及正截面短期荷载作用下的受力性能、破坏形态及变形特征有了初步了解,同时研究分析了废弃纤维再生混凝土梁的斜截面和正截面承载能力、抗裂度、正常使用荷载下的最大裂缝宽度和挠度情况,并按照现行《混凝土结构设计规范》GB50010-2010中相关公式对废弃纤维再生混凝土梁的开裂弯矩、受弯极限承载力、跨中挠度、最大裂缝宽度以及斜截面受剪极限承载力的理论计算的适用性进行了分析。通过对试验结果的分析研究,本文总结出以下主要结论：(1) 废弃纤维再生混凝土梁的正截面混凝土应变均符合平截面假定；受剪破坏的废弃纤维再生混凝土梁在极限荷载的40%以内符合平截面假定;(2) 废弃纤维的掺入可以改善再生混凝土梁的抗裂性,使得废弃纤维再生混凝土梁的抗裂性能达到甚至超过普通混凝土梁。并且可以更好地限制裂缝的发展,提高了试件的刚度。(3) 废弃纤维的掺入使废弃纤维再生混凝土梁的延性明显提高。在试件受拉钢筋开始屈服之后至达到极限承载力之前,废弃纤维再生混凝土梁相比于普通混凝土梁以及再生混凝土梁仍能保持较长时间的持载能力,试件变形增大的同时,承载力仍能有一定的提升。(4) 废弃纤维再生混凝土梁在各阶段承载能力均达到甚至超过普通混凝土梁。按照现行《规范》公式对废弃纤维再生混凝土梁的正截面受弯和斜截面受剪承载力进行计算是可行的,且计算结果偏于安全。(5) 按照现行《规范》公式对废弃纤维再生混凝土梁的挠度进行验算是可行的,且计算结果偏于安全。(6) 按照现行《规范》公式对废弃纤维再生混凝土梁的最大裂缝宽度进行验算是可行的,但相比于普通混凝土梁,按照《规范》公式计算的最大裂缝宽度安全储备较大。本文提出修正系数。系数v建议取1.40。(7) 通过对各废弃纤维掺入量下废弃纤维再生混凝土梁受弯以及斜截面受剪性能的综合对比发现,废弃纤维再生混凝土梁受弯以及斜截面受剪性能并不与废弃纤维的掺入量的多少以及纤维长度的长短成正比。
[Abstract]:In order to understand the shear and flexural behavior of recycled concrete beams, In this paper, the shear and bending properties of 12 and 14 rectangular beams with different waste fiber content and different replacement ratio of recycled aggregate were tested. The volume of waste fiber was 0.08 and 0.120.16, the fiber length was 12mm and 19mm / 30mm, respectively, and the replacement rate of recycled aggregate was 0.50mm and 100mm respectively. The cross section sizes of the beams are 2300mm 脳 200mm 脳 300mm and 2250mm 脳 150mm 脳 300mm. In this paper, the mechanical behavior, failure form and deformation characteristics of abandoned fiber regenerated concrete beams under the action of oblique section and normal section are preliminarily understood. At the same time, the load-bearing capacity, crack resistance, maximum crack width and deflection of abandoned fiber recycled concrete beams under normal load are studied and analyzed. According to the relevant formula in GB50010-2010, the cracking moment, ultimate flexural capacity and mid-span deflection of abandoned fiber reinforced recycled concrete beams are studied. The applicability of theoretical calculation of maximum crack width and shear ultimate bearing capacity of inclined section is analyzed. The main conclusions are summarized as follows: (1) the normal section concrete strain of abandoned fiber regenerated concrete beam conforms to the assumption of plane section; The shear failure of abandoned fiber reinforced recycled concrete beams is within 40% of the ultimate load according to the assumption of plane section. (2) the crack resistance of recycled concrete beams can be improved by adding waste fiber, and the crack resistance of recycled concrete beams is even higher than that of ordinary concrete beams. And it can better limit the crack development and improve the stiffness of the specimen. (3) the ductility of recycled concrete beams is obviously improved by the incorporation of waste fiber. After the tensile steel bar begins to yield to reach the ultimate bearing capacity, the recycled fiber reinforced concrete beam can maintain the capacity of holding load for a long time compared with the ordinary concrete beam and the recycled concrete beam, and the deformation of the specimen increases at the same time. The bearing capacity can still be improved to some extent. (4) the bearing capacity of abandoned fiber recycled concrete beams reaches or even exceeds that of ordinary concrete beams in every stage. According to the current formula, it is feasible to calculate the shear capacity of normal section and oblique section of abandoned fiber recycled concrete beam. And the calculation results are more safety. (5) it is feasible to check the deflection of abandoned fiber recycled concrete beams according to the current formula. And the calculation results are more safety. (6) it is feasible to check the maximum crack width of abandoned fiber recycled concrete beams according to the current formula, but compared with ordinary concrete beams, The safety reserve of maximum crack width calculated according to the formula is large. In this paper, the correction coefficient is proposed. Coefficient v suggested 1.40. (7) through the comprehensive comparison of the shear behavior of recycled concrete beams with waste fibers, the flexural behavior and the shear behavior of oblique sections of recycled concrete beams are found. The shear behavior of recycled concrete beams is not proportional to the amount of waste fibers and the length of the fibers.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU377.9
[Abstract]:In order to understand the shear and flexural behavior of recycled concrete beams, In this paper, the shear and bending properties of 12 and 14 rectangular beams with different waste fiber content and different replacement ratio of recycled aggregate were tested. The volume of waste fiber was 0.08 and 0.120.16, the fiber length was 12mm and 19mm / 30mm, respectively, and the replacement rate of recycled aggregate was 0.50mm and 100mm respectively. The cross section sizes of the beams are 2300mm 脳 200mm 脳 300mm and 2250mm 脳 150mm 脳 300mm. In this paper, the mechanical behavior, failure form and deformation characteristics of abandoned fiber regenerated concrete beams under the action of oblique section and normal section are preliminarily understood. At the same time, the load-bearing capacity, crack resistance, maximum crack width and deflection of abandoned fiber recycled concrete beams under normal load are studied and analyzed. According to the relevant formula in GB50010-2010, the cracking moment, ultimate flexural capacity and mid-span deflection of abandoned fiber reinforced recycled concrete beams are studied. The applicability of theoretical calculation of maximum crack width and shear ultimate bearing capacity of inclined section is analyzed. The main conclusions are summarized as follows: (1) the normal section concrete strain of abandoned fiber regenerated concrete beam conforms to the assumption of plane section; The shear failure of abandoned fiber reinforced recycled concrete beams is within 40% of the ultimate load according to the assumption of plane section. (2) the crack resistance of recycled concrete beams can be improved by adding waste fiber, and the crack resistance of recycled concrete beams is even higher than that of ordinary concrete beams. And it can better limit the crack development and improve the stiffness of the specimen. (3) the ductility of recycled concrete beams is obviously improved by the incorporation of waste fiber. After the tensile steel bar begins to yield to reach the ultimate bearing capacity, the recycled fiber reinforced concrete beam can maintain the capacity of holding load for a long time compared with the ordinary concrete beam and the recycled concrete beam, and the deformation of the specimen increases at the same time. The bearing capacity can still be improved to some extent. (4) the bearing capacity of abandoned fiber recycled concrete beams reaches or even exceeds that of ordinary concrete beams in every stage. According to the current formula, it is feasible to calculate the shear capacity of normal section and oblique section of abandoned fiber recycled concrete beam. And the calculation results are more safety. (5) it is feasible to check the deflection of abandoned fiber recycled concrete beams according to the current formula. And the calculation results are more safety. (6) it is feasible to check the maximum crack width of abandoned fiber recycled concrete beams according to the current formula, but compared with ordinary concrete beams, The safety reserve of maximum crack width calculated according to the formula is large. In this paper, the correction coefficient is proposed. Coefficient v suggested 1.40. (7) through the comprehensive comparison of the shear behavior of recycled concrete beams with waste fibers, the flexural behavior and the shear behavior of oblique sections of recycled concrete beams are found. The shear behavior of recycled concrete beams is not proportional to the amount of waste fibers and the length of the fibers.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU377.9
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