钢管混凝土短柱分段模型及局部承压性能分析

发布时间：2018-05-14 00:26

本文选题：钢管混凝土 + 分段模型　；参考：《华北理工大学》2017年硕士论文

【摘要】：装配式钢-混凝土结构体系不可避免需要大量的节点、水平接缝、竖向接缝,这些节点和接缝的设计直接影响着结构的合理受力和整体抗震性能。装配式钢管混凝土组合剪力墙结构体系是苏幼坡教授的科研团队提出的一种新型结构体系,其中钢管混凝土节点的可靠连接是首先需要解决的难题。文中对其新型装配式钢管混凝土柱节点连接进行了轴压和局部承压性能的理论分析和数值研究,基于有限元计算平台建立分段模型予以实现。通过节点构件的试验结果,校核和验证模型关键参数,主要内容包括:1)将国内外8部关于钢管混凝土在轴向压力作用下的承载力设计规程进行归纳对比,并分别从多角度分析其公式间的差异性,通过具体算例进行对比研究。结果表明,国外规程对于极限承载力的设计偏于保守,我国规程计算的结果相比于其他4个国家更接近试验实测结果。2)基于Open SEES,建立钢管混凝土短柱和圆中空夹层钢管混凝土短柱的全截面受压模型,将计算结果和试验结果进行对比。在该模型的基础上,对关键参数进行分析。结果表明,增大核心混凝土强度、套箍系数和钢管屈服强度,减小径厚比,可提高圆钢管混凝土试件的极限承载力;增大空心率和外钢管径厚比,减小长细比,可增大圆中空夹层钢管混凝土试件的极限承载力。3)建立圆钢管约束高强灌浆料局部承压的分段模型,基于ABAQUS软件,对比分析了不同因素影响下节点连接的敏感度。结果表明,圆钢管约束高强灌浆料在局部承压作用下的极限承载力,随试件高径比、钢管壁厚和高强灌浆料强度的增大而增大;圆钢管约束高强灌浆料在局部冲压作用下的极限承载力,随冲切角、钢管高度和钢管壁厚的增大而增大。
[Abstract]:It is inevitable that a large number of joints, horizontal joints and vertical joints are needed in the fabricated steel-concrete structure system. The design of these joints and joints directly affects the reasonable force and overall seismic performance of the structure. The fabricated concrete filled steel tubular composite shear wall structure system is a new type of structure system proposed by Professor Su Youpo's research team. The reliable connection of concrete-filled steel tubular joints is the first difficult problem to be solved. In this paper, the theoretical analysis and numerical study on the axial compression and local bearing capacity of the new fabricated concrete-filled steel tubular (CFST) connections are carried out, and the segmented model is established based on the finite element calculation platform. Through the test results of joint members, checking and verifying the key parameters of the model, the main contents include: 1) the design rules for bearing capacity of concrete-filled steel tube (CFST) under axial pressure are summarized and compared with 8 parts at home and abroad. The differences between the formulas are analyzed from different angles, and compared with each other by concrete examples. The results show that the design of the ultimate bearing capacity of foreign codes is conservative. Compared with the other four countries, the calculated results in China are closer to the experimental results. 2) based on Open SEESs, the full section compression models of concrete filled steel tubular columns and hollow sandwich filled steel tubular concrete filled steel tubular short columns are established. The calculated results are compared with the experimental results. Based on the model, the key parameters are analyzed. The results show that the ultimate bearing capacity of the concrete specimens can be increased by increasing the strength of the core concrete, the hoop coefficient and the yield strength of the steel tube, the ratio of diameter to thickness can be increased, the ratio of the diameter to thickness of the outer steel tube will be increased, and the ratio of the length to the thickness can be decreased. The ultimate bearing capacity of concrete-filled circular hollow sandwich steel tube specimens can be increased. 3) the sectional model of local bearing capacity of circular steel tube confined high strength grouting material is established. Based on ABAQUS software, the sensitivity of joint connection under different factors is compared and analyzed. The results show that the ultimate bearing capacity of high strength grouting material confined by circular steel pipe under local pressure increases with the increase of the ratio of height to diameter, the wall thickness of steel tube and the strength of high strength grouting material. The ultimate bearing capacity of circular steel tube confined high strength grouting material under local punching increases with the increase of punching angle, steel pipe height and steel pipe wall thickness.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9

【参考文献】