填充轻骨料混凝土的冷成型椭圆形截面钢管短柱轴压性能研究

发布时间：2018-08-22 20:33

【摘要】：为研究由热轧圆钢管冷拔成型的椭圆钢管短柱的轴压性能,分别对空腹和填充轻骨料混凝土的椭圆钢管短柱进行试验,分析椭圆钢管和轻骨料混凝土的材料性能以及短柱试件的承载能力、破坏模式、延性等。结果表明:与母材热轧圆钢管相比,冷拔成型椭圆钢管短柱表现出较低的承载力和延性;填充轻骨料混凝土能够显著提高试件的承载力和延性;相比于椭圆钢管短柱,填充混凝土对圆钢管短柱轴压承载力和延性提高程度大,且壁厚小的试件轴压承载力和延性的提高程度大(约10%);通过与国内外相关设计规范计算结果的对比,现行针对热处理椭圆钢管短柱承载能力计算方法可用于冷成型椭圆钢管短柱承载能力计算,EC4规范可以较准确的估计圆钢管混凝土试件的承载能力,我国CECS 28:2012钢管混凝土结构技术规程适用于壁厚较小的冷成型椭圆钢管混凝土短柱轴压承载力计算,壁厚较大的冷成型椭圆钢管混凝土短柱轴压承载力计算方法有待进一步研究。
[Abstract]:In order to study the axial compression properties of elliptical steel tube short columns formed by cold drawing of hot rolled circular steel tubes, the elliptical steel tube short columns with empty stomach and filled with lightweight aggregate concrete were tested. The material properties of elliptical steel tube and lightweight aggregate concrete, as well as the bearing capacity, failure mode and ductility of short column specimens are analyzed. The results show that the cold drawing elliptical steel tube short column has lower bearing capacity and ductility than the base metal hot rolled round steel tube, the filling of lightweight aggregate concrete can significantly improve the bearing capacity and ductility of the specimen, and compared with the elliptical steel tube short column, the cold drawn elliptical steel tube short column can improve the bearing capacity and ductility of the specimen. The axial compression capacity and ductility of short steel tubular columns filled with concrete are greatly improved (about 10%), and the axial compression capacity and ductility of the specimens with small wall thickness are greatly improved (about 10%), and the calculated results are compared with those calculated in the relevant design codes at home and abroad. According to the current calculation method for the bearing capacity of elliptical steel tube short columns after heat treatment, EC4 code can accurately estimate the bearing capacity of concrete filled circular steel tube specimens, which can be used to calculate the bearing capacity of cold forming elliptical steel tube short columns. The CECS 28: 2012 concrete filled steel tube (CFST) structure technical specification is suitable for the calculation of axial compressive capacity of cold-formed elliptical concrete-filled steel tube (CFST) short columns with small wall thickness, while the calculation method of cold-formed elliptical CFST short columns with larger wall thickness needs further study.
【作者单位】：同济大学土木工程防灾国家重点实验室;同济大学建筑工程系;上海市隧道工程轨道交通设计研究院;香港理工大学土木与环境工程学系;
【基金】：国家自然科学基金重点项目(51038008)
【分类号】：TU398.9

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