钢管混凝土短柱轴压力学性能分析及其数值模拟

摘要

钢管混凝土短柱是研究钢管混凝土最基本的构件,研究钢管混凝土短柱有助于了解钢管混凝土的力学性能,为研究其他构件提供了一个基础.对钢管混凝土短柱的力学性能进行了分析,归纳总结了短住轴压承载力理论计算公式,并采用有限元软件ABAQUS对不同壁厚钢管混凝土短柱进行轴心受压模拟.总结得出,随着壁厚的增加,钢管混凝土短柱的极限承载能力逐步提高,二者之间符合线性关系.将数值模拟软件计算求得不同壁厚短柱极限承载力与理论公式计算得出的值做出对比分析,校核发现两者较为接近,说明数值模拟计算效果良好.最后,总结分析位移荷载曲线,提出钢管混凝土短柱塑性破坏角概念.随着钢管壁厚的增加,短柱塑性变形能力提高,塑性破坏角变大,当壁厚达到11.1851 mm时,短柱发生理想塑性变形.%Concrete-filled steel tubular short columns is helpful to understand the mechanical properties of con -crete-filled steel tubes was studied , which provides a basis for the study of other components .The mechanical prop-erties of CFST short columns are analyzed , and the theoretical formulas for calculating the axial bearing capacity of short columns are summarized .The finite element software ABAQUS was used to simulate the axial compression of concrete filled steel tubular columns with different wall thickness .It is concluded that the ultimate load carrying ca-pacity of CFST short columns increases with the increase of wall thickness , which is linearly related .The numerical simulation software is used to calculate the ultimate bearing capacity of different wall thickness and the calculated value of the theoretical formula .Check that the two are closer , indicating that the numerical simulation results are good.Finally, the displacement load curve is analyzed and the concept of plastic failure angle of concrete -filled steel tubular short columns is proposed .With the increase of the wall thickness of the steel pipe , the plastic deformation ability of the short column is improved , and the plastic damage angle becomes larger .When the wall thickness rea-ches 11.1851 mm, the short column undergoes an ideal plastic deformation .