带缺陷的钢管混凝土构件的滞回性能研究

发布时间：2018-06-21 15:35

本文选题：钢管混凝土 + 缺陷　；参考：《福州大学》2013年硕士论文

【摘要】：本文基于试验研究和理论分析,较深入地研究带缺陷钢管混凝土试件的滞回性能。具体进行了以下几个方面的工作：(1)系统综述了有关带缺陷的钢管混凝土构件的研究现状,以及钢管混凝土构件抗震性能的研究现状。(2)共进行了24个压弯构件的滞回试验研究,其中包括18个带脱空缺陷的钢管混凝土试件和6个无脱空钢管混凝土试件。试验参数包括脱空率、轴压比和钢管壁厚。研究以上三个参数对试件承载力、刚度、耗能能力以及延性的影响规律。(3)在确定了往复荷载作用下钢材和核心混凝土应力-应变本构关系后,利用有限元软件ABAQUS进行数值模拟,同时利用现有的试验结果验证了该有限元模型的精度和可靠性。(4)利用有限元模型分析脱空率、混凝土强度、钢材屈服强度、含钢率、长细比、轴压比等参数对往复荷载作用下带缺陷钢管混凝土构件P-△曲线的影响规律。(5)利用有限元模型,对带有脱空缺陷的钢管混凝土压弯构件的P-△曲线进行全过程分析。分析钢管和核心混凝土截面应力分布规律、钢管与核心混凝土之间的相互作用等。还研究了脱空缺陷对钢管混凝土压弯试件的工作机理的影响规律并为实际工程提出建议。
[Abstract]:Based on experimental research and theoretical analysis, the hysteretic behavior of concrete filled steel tube specimens with defects is studied in this paper. In this paper, the following work is carried out: 1) A systematic review of the research status of concrete filled steel tube members with defects and seismic behavior of concrete filled steel tube members is given. (2) A total of 24 compression and bending members have been studied in hysteretic tests. There are 18 concrete filled steel tube specimens with void defect and 6 concrete filled steel tube specimens without void defect. The test parameters include void ratio, axial compression ratio and wall thickness of steel pipe. The influence of the above three parameters on the bearing capacity, stiffness, energy dissipation capacity and ductility of the specimen is studied. After determining the stress-strain constitutive relationship of steel and core concrete under reciprocating load, the finite element software Abaqus is used to simulate the constitutive relationship. At the same time, the accuracy and reliability of the finite element model are verified by the existing test results. (4) the void ratio, concrete strength, steel yield strength, steel content ratio and aspect ratio are analyzed by the finite element model. The influence of axial compression ratio on P- curve of concrete filled steel tube members with defects under reciprocating load. (5) using the finite element model, the P- curve of concrete filled steel tube members with voids is analyzed in the whole process. The stress distribution law of steel tube and core concrete section and the interaction between steel tube and core concrete are analyzed. The influence of void removal defects on the working mechanism of concrete filled steel tube specimens is also studied and some suggestions for practical engineering are put forward.
【学位授予单位】：福州大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9

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