【作者】 史小强；

【导师】 郝际平；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2007， 硕士

【摘要】 剖分T型钢作为一种新型材料，由于具有截面经济、货源充足、节点构造简单等优点，得到了越来越广泛的应用。近年来我国剖分T型钢的应用也在逐渐增多，并对这种构件的性能开展了较多的研究，但主要是针对T型钢构件轴心受压时的情况。T型钢属于单轴对称截面，屈曲性能与双轴对称截面有所不同。当压力作用于截面形心时，绕对称轴弯曲屈曲变形时同时会发生扭转，从而使截面临界荷载降低；但是如果把轴线压力移至截面剪心，绕对称轴屈曲则是只弯不扭。本文通过理论分析、试验研究、有限元计算研究了热轧H型钢剖分T型钢剪心受压屈曲性能及承载力问题。为了验证理论推导的合理性，对三种不同截面，不同长细比的十四个试件进行了剪心受压试验及相应的材性试验，考察压力作用于T型钢剪心时的整体稳定性能、剖分T型钢腹板抵抗局部失稳的能力及其与绕对称轴整体失稳的关系，验证《钢结构设计规范》(GB50017-2003)建议的腹板高厚比限值的适用性，在考虑残余应力、几何缺陷等因素基础上，采用大型有限元软件ANSYS对剖分T型钢剪心压杆的稳定性能进行了分析。结果表明：规范GB50017-2003中压弯构件计算公式和腹板高厚比限值用于T型钢剪心压杆是安全可靠的。更多还原

【Abstract】 Cut-T strut is a newly developed kind of constructional steel material which has advantages of its economical section, being ample supply of goods, and also being simple formation. Recently years, Cut-T strut is widely used in China, and many studies on the property of this kind of strut have been carried out, but mainly about the stability behavior of axial compressed cut-T struts. Cut-T strut’s section is one symmetry axis cross section, has Different buckling behavior from two symmetry axis cross section. It has two features in its buckling behavior when subjected to concentric compressive force. The first one is the fact that twisting always accompanies flexion upon the onset of buckling with respect to its axis of symmetry and thus reduces the bearing capacity of the strut. On the other hand, by shifting the force to the shear centre of the section, no twisting occurs any more and the buckling load can reach the flexural buckling load. Theoretical analyzing, testing and FEM calculating are included in this paper to study the buckling and bearing capacity.To verify the rationality of the theoretical deduction, shear center compression test and related material test of three different sections with each section having varied slenderness have been adopted to study the stability behavior of shear center axis compressed cut-T struts, the local buckling capacity of the strut web and the interactive buckling, and verifying the formula of limit of width-thickness ratio provided by Code for Design of Steel Structure GB50017-2003. And study the stability of cut-T struts by using the ANSYS-finite element analysis software, in which the factors such as residual stresses, geometric imperfections were considered.The investigation shows that the calculation formula provided by code GB50017-2003 is safe and reliable.更多还原