L、T形柱轴压比限值研究

THE AXIAL COMPRESSION RATIO OF COLUMNS WITH L, T-SHAPED CROSS-SECTIONS

对T、L形柱轴压比限值进行了深入的研究,指出T、L形柱轴压比限值与截面尺寸有关;并针对T、L形柱当腹板受压时轴压比限值很低,在实际工程设计中很难实现这一现象,提出了提高轴压比限值的方法,考虑增加腹板端部配筋和箍筋约束混凝土作用的有利影响,对T、L形柱轴压比限值进行了电算分析。得出了以下主要结论:T、L形柱肢长、厚比越大,轴压比限值越低;增加腹板端部配筋对T、L形柱轴压比限值有所改善;考虑箍筋约束混凝土作用对轴压比限值有明显提高。最后给出了考虑肢长、厚比不同的T、L形柱轴压比限值。

In this paper, an investigation on axial compression ratio of columns with T, L-shaped cross-sections is carried out by numerical method. The analytical results indicate that the axial compression ratio of columns with L,T-shaped cross-sections is related to section dimensions. In order to raise the axial compression ratio when the web is in compression, the favorable effects of changing the form of reinforcement and considering the confined concrete are discussed. The following results can be drawn through theoretical analysis: the axial compression ratio index reduces with the drop of the ratio of length to thickness of sections; the index will increase when the steels in the end of the web are enhanced; under certain diameter and spacing of stirrups, the axial compression ratio index is raised. At last, the axial compression ratio indexes considering the dimensions of columns with T, L-shaped cross-sections are given.