钢筋再生混凝土构件受力性能分析及设计方法研究
发布时间：2018-08-13 19:28
【摘要】：再生混凝土技术,是指将废弃混凝土重新转换成为粗骨料或细骨料,并将其拌制于新制混凝土中,在混凝土用天然骨料日益消耗造成骨料产地重大的环境负担的今天,具有良好的应用前景。相比于钢筋混凝土结构的成熟性,钢筋再生混凝土结构的研究处于起步阶段,理论体系尚未成熟。本文在课题组试验基础上,通过ABAQUS数值模拟技术,对本课题组前期完成的钢筋再生混凝土板、梁、柱构件的受力进行全过程的有限元分析,并与试验结果进行对比。在此基础上,对板试件的取代率、厚度；梁试件的取代率、剪跨比,配箍率,配筋率；柱试件的配筋率、取代率、偏心率、相对偏心距、长细比等参数进行变化分析,建立拓展有限元模型,分别研究各变化参数对构件受力性能的影响。并参照现行钢筋混凝土结构设计规范中给出的针对不同构件的承载力的计算公式,对公式中的参数进行修正,使其能适用于钢筋再生混凝土结构的工程计算以及设计工作,旨在对钢筋再生混凝土结构的工程设计、理论研究工作提供有价值的参考。结论表明：(1)对于板试件：极限承载力随取代率的增加表现为降低之势,提高配筋率,对单向板的受力过程、变形能力几乎没有影响,但对双向板的早期刚度以及极限承载力的提高均能产生有利影响。(2)对于梁试件：剪跨比对极限承载力影响较为明显,随剪跨比增大,试件极限承载力显著降低,破坏形态发生改变；骨料取代率对极限承载力影响不明显,当取代率增加时,混凝土强度有降低趋势。箍筋配箍率,以及纵筋配筋率对承载力大小均有影响,增大配箍率或配筋率,将对承载力的提高产生有利影响,但配筋率超过时,承载力不再提高,与普通混凝土力学性能相似。(3)对于柱试件：随配箍率的增大,极限承载力小幅度提高；随配筋率的增大,极限承载力明显提高；随相对偏心距的增大,极限承载力显著降低。在一定范围内,长细比的增大对极限承载力的削弱较明显。配箍率、配筋率、长细比对柱试件承载力的影响,随着相对偏心距的增大而有被削弱的趋势。
[Abstract]:The technology of recycled concrete is to convert waste concrete into coarse aggregate or fine aggregate, and mix it into new concrete. Today, natural aggregate used in concrete is increasingly consumed, which results in a heavy environmental burden of aggregate producing area. It has good application prospect. Compared with the maturity of reinforced concrete structures, the research of reinforced recycled concrete structures is at the initial stage, and the theoretical system is not yet mature. On the basis of the experiments of the research group, the finite element analysis of the whole process of the rebar reclaimed concrete slabs, beams and columns was carried out by using the ABAQUS numerical simulation technique, and the results were compared with the experimental results. On this basis, the substitution rate, thickness, shear span ratio, hoop ratio, reinforcement ratio of plate specimen, replacement rate, eccentricity ratio, relative eccentricity, aspect ratio and other parameters of column specimen are analyzed. The extended finite element model is established to study the influence of the varying parameters on the mechanical performance of the member. According to the calculation formula for the bearing capacity of different members given in the current design code for reinforced concrete structures, the parameters in the formula are modified so that it can be applied to the engineering calculation and design work of reinforced recycled concrete structures. The purpose of this paper is to provide a valuable reference for the engineering design of reinforced recycled concrete structure. The conclusions are as follows: (1) for the plate specimens, the ultimate bearing capacity decreases with the increase of the replacement ratio, and the reinforcement ratio increases, which has little effect on the deformation capacity of the unidirectional plate. But it has a beneficial effect on the early stiffness and the increase of ultimate bearing capacity of two-way slab. (2) for beam specimens, the shear span ratio has a more obvious effect on ultimate bearing capacity, and with the increase of shear span ratio, the ultimate bearing capacity of the specimen decreases significantly. The failure morphology is changed and the aggregate replacement ratio has no obvious effect on the ultimate bearing capacity. When the replacement ratio increases the strength of concrete tends to decrease. The ratio of stirrups and longitudinal reinforcement has an effect on the bearing capacity. The increase of hoop ratio or reinforcement ratio will have a beneficial effect on the increase of bearing capacity, but when the reinforcement ratio exceeds, the bearing capacity will no longer increase. (3) for column specimens, the ultimate bearing capacity increases slightly with the increase of hoop ratio; with the increase of reinforcement ratio, the ultimate bearing capacity increases obviously; with the increase of relative eccentricity, the ultimate bearing capacity decreases significantly. In a certain range, the increase of slenderness ratio weakens the ultimate bearing capacity obviously. The effect of hoop ratio, reinforcement ratio and aspect ratio on the bearing capacity of column specimens tends to be weakened with the increase of relative eccentricity.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528
，
本文编号：2181954
[Abstract]:The technology of recycled concrete is to convert waste concrete into coarse aggregate or fine aggregate, and mix it into new concrete. Today, natural aggregate used in concrete is increasingly consumed, which results in a heavy environmental burden of aggregate producing area. It has good application prospect. Compared with the maturity of reinforced concrete structures, the research of reinforced recycled concrete structures is at the initial stage, and the theoretical system is not yet mature. On the basis of the experiments of the research group, the finite element analysis of the whole process of the rebar reclaimed concrete slabs, beams and columns was carried out by using the ABAQUS numerical simulation technique, and the results were compared with the experimental results. On this basis, the substitution rate, thickness, shear span ratio, hoop ratio, reinforcement ratio of plate specimen, replacement rate, eccentricity ratio, relative eccentricity, aspect ratio and other parameters of column specimen are analyzed. The extended finite element model is established to study the influence of the varying parameters on the mechanical performance of the member. According to the calculation formula for the bearing capacity of different members given in the current design code for reinforced concrete structures, the parameters in the formula are modified so that it can be applied to the engineering calculation and design work of reinforced recycled concrete structures. The purpose of this paper is to provide a valuable reference for the engineering design of reinforced recycled concrete structure. The conclusions are as follows: (1) for the plate specimens, the ultimate bearing capacity decreases with the increase of the replacement ratio, and the reinforcement ratio increases, which has little effect on the deformation capacity of the unidirectional plate. But it has a beneficial effect on the early stiffness and the increase of ultimate bearing capacity of two-way slab. (2) for beam specimens, the shear span ratio has a more obvious effect on ultimate bearing capacity, and with the increase of shear span ratio, the ultimate bearing capacity of the specimen decreases significantly. The failure morphology is changed and the aggregate replacement ratio has no obvious effect on the ultimate bearing capacity. When the replacement ratio increases the strength of concrete tends to decrease. The ratio of stirrups and longitudinal reinforcement has an effect on the bearing capacity. The increase of hoop ratio or reinforcement ratio will have a beneficial effect on the increase of bearing capacity, but when the reinforcement ratio exceeds, the bearing capacity will no longer increase. (3) for column specimens, the ultimate bearing capacity increases slightly with the increase of hoop ratio; with the increase of reinforcement ratio, the ultimate bearing capacity increases obviously; with the increase of relative eccentricity, the ultimate bearing capacity decreases significantly. In a certain range, the increase of slenderness ratio weakens the ultimate bearing capacity obviously. The effect of hoop ratio, reinforcement ratio and aspect ratio on the bearing capacity of column specimens tends to be weakened with the increase of relative eccentricity.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528
，
本文编号：2181954
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