超高性能混凝土加固柱轴心受压承载力计算方法研究

The calculation method of bearing capacity of axial compression columns strengthened with UHPC

为研究超高性能混凝土(UHPC)加固圆形截面柱轴压力学性能,以有限元软件ABAQUS分析为主要研究手段,以箍筋直径、箍筋间距和高径比为变化参数进行了13个试件的有限元分析,探讨各参数对UHPC加固圆形截面柱轴压力学性能的影响,研究极限承载力计算方法,提出实用设计公式.随着箍筋间距、高径比的增大,极限承载力出现了不同程度地退化,随着UHPC厚度和箍筋直径的增大试件极限承载力有所提高.基于约束混凝土理论提出的UHPC加固圆形截面柱轴压极限承载力计算方法有较好的适用性.

In order to study the axial compressive performance with ultra-high performance concrete(UHPC),the finite element software ABAQUS is used as the main research means.Basing on the parameters such as stirrup diameter,stirrup spacing and slenderness ratio,the analysis of 13 specimens is carried out,the influence of various influencing parameters on the axial compressive performance of circular section columns strengthened with UHPC is discussed,the calculation method of ultimate bearing capacity is studied,and a practical design formula is put forward.The results show that the ultimate bearing capacity of the specimen degrades in varying degrees with the increase of stirrup spacing and slenderness ratio,and the ultimate bearing capacity of the specimen increases effectively with the increase of UHPC thickness and stirrup diameter.The calculation method of ultimate bearing capacity of circular section columns strengthened with UHPC based on confined concrete theory has good applicability.