部分包裹型钢混凝土柱轴压受力性能研究
发布时间：2018-08-27 17:38
【摘要】：部分包裹型钢混凝土柱简称PEC柱,是型钢和混凝土相结合的一种产物,是以现代钢结构和混凝土结构为基础发展出来的新型结构。本文采取结构试验、数值模拟和理论计算相结合的方法,研究PEC组合柱结构在轴向荷载作用下的受力性能。本文对两个PEC组合柱试件进行了轴向荷载作用下的静力试验研究,观察试验过程中试件受力情况,分析得到试件受力特征以及其协同工作原理及组合作用,研究了该组合结构在竖向荷载作用下的破坏模式,并从承载能力、荷载变形和延性等方面分析该组合结构的受力性能。通过有限元分析软件创建了PEC组合柱结构模型,并对该结构模型进行受力性能数值模拟分析。将模拟结果与试验研究结果进行对比,验证有限元软件模拟结论的有效性和可靠性,以此为基础探讨分析型钢高厚比、混凝土强度、系杆间距和含钢率对试件初始刚度、极限承载力和延性的影响,并总结分析此类组合结构的受力性能。最后,基于现行规范,采用简单叠加原理方法计算PEC组合柱极限承载力,并与有限数值模拟结果和试验结果比较。研究结果表明,PEC组合柱结构受力性能良好,理论计算结果和数值模拟结果与试验结果吻合较好;随着型钢高厚比的增长,试件变形能力增大,延性提高,但试件初始刚度和极限承载力不断减小;试件含钢率提高,试件极限承载力和初始刚度不断提高;随着钢筋系杆间距增大,试件初始刚度基本不变,极限承载能力和延性随荷载增加有所降低,试件达到屈服荷载后,试件强度退化加快,并且钢筋系杆间距小的试件延性性能好;在本文研究范围内,混凝土强度变化对试件受力性能影响不显著。该研究结果为以后PEC柱设计提供了合理的理论依据和参考,具有一定的学术和工程应用价值。
[Abstract]:The partially wrapped steel reinforced concrete column is called PEC column for short, which is a new type of structure developed on the basis of modern steel structure and concrete structure. In this paper, the mechanical behavior of PEC composite column structure under axial load is studied by means of structural test, numerical simulation and theoretical calculation. In this paper, two specimens of PEC composite columns are tested under axial load. The stress of the specimens during the test is observed, and the stress characteristics of the specimens are analyzed. The failure modes of the composite structure under vertical load are studied. The failure modes of the composite structure are analyzed from the load-bearing capacity, load-deformation and combined action. The mechanical properties of the composite structure are analyzed in terms of ductility. The PEC composite column structure model is established by finite element analysis software, and the mechanical properties of the structure model are numerically simulated and analyzed. The influence of section steel height-thickness ratio, concrete strength, tie spacing and steel ratio on the initial stiffness, ultimate bearing capacity and ductility of the specimens are analyzed. The mechanical properties of the composite structures are summarized and analyzed. Finally, based on the current code, the ultimate bearing capacity of the PEC composite columns is calculated by using the simple superposition principle method, and the results are compared with the finite numerical simulation and test results. The results show that the mechanical properties of PEC composite columns are good, and the results of theoretical calculation and numerical simulation are in good agreement with the experimental results; with the increase of section steel ratio, the deformation capacity and ductility of the specimens increase, but the initial stiffness and ultimate bearing capacity of the specimens decrease; with the increase of steel content, the ultimate bearing capacity of the specimens increases. The ultimate bearing capacity and ductility of the specimens decrease with the increase of the load. After the specimens reach the yield load, the strength degradation of the specimens is accelerated, and the ductility of the specimens with small spacing of the tie bars is good. In this paper, the concrete strength changes with the increase of the distance between the tie bars. The research results provide a reasonable theoretical basis and reference for the future design of PEC columns, and have certain academic and engineering application value.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9
本文编号：2207969
[Abstract]:The partially wrapped steel reinforced concrete column is called PEC column for short, which is a new type of structure developed on the basis of modern steel structure and concrete structure. In this paper, the mechanical behavior of PEC composite column structure under axial load is studied by means of structural test, numerical simulation and theoretical calculation. In this paper, two specimens of PEC composite columns are tested under axial load. The stress of the specimens during the test is observed, and the stress characteristics of the specimens are analyzed. The failure modes of the composite structure under vertical load are studied. The failure modes of the composite structure are analyzed from the load-bearing capacity, load-deformation and combined action. The mechanical properties of the composite structure are analyzed in terms of ductility. The PEC composite column structure model is established by finite element analysis software, and the mechanical properties of the structure model are numerically simulated and analyzed. The influence of section steel height-thickness ratio, concrete strength, tie spacing and steel ratio on the initial stiffness, ultimate bearing capacity and ductility of the specimens are analyzed. The mechanical properties of the composite structures are summarized and analyzed. Finally, based on the current code, the ultimate bearing capacity of the PEC composite columns is calculated by using the simple superposition principle method, and the results are compared with the finite numerical simulation and test results. The results show that the mechanical properties of PEC composite columns are good, and the results of theoretical calculation and numerical simulation are in good agreement with the experimental results; with the increase of section steel ratio, the deformation capacity and ductility of the specimens increase, but the initial stiffness and ultimate bearing capacity of the specimens decrease; with the increase of steel content, the ultimate bearing capacity of the specimens increases. The ultimate bearing capacity and ductility of the specimens decrease with the increase of the load. After the specimens reach the yield load, the strength degradation of the specimens is accelerated, and the ductility of the specimens with small spacing of the tie bars is good. In this paper, the concrete strength changes with the increase of the distance between the tie bars. The research results provide a reasonable theoretical basis and reference for the future design of PEC columns, and have certain academic and engineering application value.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9
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