钢管再生混凝土压弯构件滞回性能研究

发布时间：2018-04-02 10:19

本文选题：钢管再生混凝土　切入点：滞回曲线　出处：《北方工业大学》2017年硕士论文

【摘要】：近年来由于环境问题突出,废旧混凝土的再利用日益被学者专家关注。但是再生混凝土的力学基本特征比普通混凝土差。再生混凝土结构的性能也不如普通混凝土结构,这使再生混凝土不能广泛推广应用实践。从建筑垃圾中回收得到再生混凝土,并将再生混凝土灌入钢管内形成了钢管再生混凝土构件。这种结构不仅能改善再生混凝土的受力缺点,而且可以提升钢管的稳定性。这种新型的组合结构有利于缓解资源危机,同时为处置建筑废弃物提供了一种新的方法。目前,轴压性能是钢管再生混凝土构件的主要研究方向,趋于成熟,抗震性能研究不多。基于此,本文从以下几个方面进行研究:(1)本文设计了 6个直径219mm,壁厚3.5mm的薄壁钢管再生混凝土构件。以轴压比为主要参数,轴压比设置为0.2、0.4、0.6。每个轴压比浇筑两个试件。经过试验得到试件的滞回曲线,并分析得到骨架曲线和刚度退化曲线,同时进行比较研究。计算得到试件的等效粘滞系数和延性系数,较直观的反映试件的变形能力和耗能能力。研究表明:随着轴压比的增加,试件的变形能力明显减弱,延性变差,水平承载力有所提升。(2)通过ABAQUS有限元软件数值模拟了 6个构件,得到6个构件的骨架曲线。将有限元分析的结果与实验结果进行比较。同时模拟分析了含钢率对试件滞回曲线的影响,分析表明:含钢率也是结构抗震性能的重要指标,随着含钢率的增加,试件的延性和水平承载力都得到了提升。最后,借鉴了钢管混凝土骨架曲线三折线理论研究,计算了三折线的各个特征点,并对理论水平承载力和试验进行了比较。
[Abstract]:In recent years, due to the outstanding environmental problems, the reuse of waste concrete has been paid more and more attention by scholars and experts.But the basic mechanical characteristics of recycled concrete are worse than that of ordinary concrete.The performance of recycled concrete structure is also inferior to that of ordinary concrete structure, which makes recycled concrete can not be widely used in practice.Recycled concrete was recovered from construction waste, and recycled concrete was poured into steel tube to form recycled concrete filled steel tube.This kind of structure can not only improve the mechanical defect of recycled concrete, but also improve the stability of steel pipe.The new combined structure is helpful to alleviate the resource crisis and provide a new method for the disposal of construction waste.At present, axial compression behavior is the main research direction of recycled concrete filled steel tube members.Based on this, this paper studies the following aspects: 1) this paper designs six thin-walled recycled concrete filled steel tube members with 219mm diameter and wall thickness 3.5mm.The axial pressure ratio is set as 0.2g 0.40.6.The axial compression ratio is the main parameter.Cast two specimens per axial compression ratio.The hysteretic curves, skeleton curves and stiffness degradation curves of the specimens were obtained by experiments, and a comparative study was carried out at the same time.The equivalent viscosity coefficient and ductility coefficient of the specimen are calculated, which can reflect the deformation ability and energy dissipation ability of the specimen directly.The results show that with the increase of axial compression ratio, the deformability of the specimen decreases obviously, the ductility becomes worse, and the horizontal bearing capacity is improved. (2) six members are numerically simulated by the ABAQUS finite element software, and the skeleton curves of the six members are obtained.The finite element analysis results are compared with the experimental results.At the same time, the influence of the steel content ratio on the hysteresis curve of the specimen is simulated and analyzed. The analysis shows that the steel content ratio is also an important index of the seismic performance of the structure. With the increase of the steel content ratio, the ductility and the horizontal bearing capacity of the specimen are improved.Finally, based on the theoretical study of the three-fold curve of concrete-filled steel tube (CFST) skeleton curve, the characteristic points of the three-fold line are calculated, and the theoretical horizontal bearing capacity is compared with the test.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9

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