内压外拉预应力杆的受压稳定分析

BUCKLING OF COLUMNS PRE-TENSIONED BY A COMPRESSED CORE-BAR

从三方面对内压外拉预应力杆的受压弹性承载力进行了分析:一是纯理论分析,包括静力法和能量法的求解;二是非线性弹性有限元分析,采用ANSYS和ABAQUS两种软件;三是试验研究。三个方面的研究结果均表明:施加预拉力不能提高弹性临界荷载。欧本试验和非线性有限元分析的结果还表明:芯棒施加预压力降低了压杆的整体临界荷载。

The paper studied the buckling of pre-stressed columns where the exterior tube is pre-tensioned by a pre-compressed core bar.Analysis is carried out in three ways.One is the theoretical analysis where the static approach and the energy method judging the stability of a structural system are used separately;the second method is the FE analysis using ANSYS and ABAQUS;the third is the test verification.The results of these three different studies show that the prestress in the column can not increase the buckling load,but reduce it slightly.