摘要
首先介绍了柱段试验的功能和注意事项,强调它不同于短柱试验的特点。其次分析柱段试验提供数据的利用。试验既可显示残余压应力的峰值,也可给出在板件相互约束条件下的局部屈曲稳定系数。对于板件宽厚比超限的柱段,现行的杆件屈曲后强度计算方法给出的承载力高于试验值,应该视为正常现象,否则将不适用于实际应用的压杆。改变这类状况的方法不是对系数取值的修改,而是需要把有效屈服强度系数和杆件长度相联系。最后提出宽厚比超限压杆的相关屈曲法。和试验资料进行对比表明此法比有效屈服点法或有效截面法有很大改进,可以推荐应用于工程设计。
This article firstly introduces the stub-column test,its function and points of attention,emphasizing on its peculiarity different from the test of short columns.Afterwards,utilization of the data provided by stub-column test is analyzed.The test not only reveals the peak value of the compressive residual stress,but also gives the stability coefficient of local buckling for plate elements under mutual restraint.For stub-columns with plate slenderness beyond limit,it should be considered as normal when the capacity calculated according to current approach of post-buckling strength surpasses the test value.Otherwise,the approach will not be suited for struts of practical usage.The way of changing this situation does not lie in amending some coefficient figures,but in linking the factor of effective yield strength with the member length.Lastly,a new method,the approach of interactive buckling,is put forward for struts with plate slenderness beyond limit.Comparison with experimental data shows that remarkable improvement has been achieved over the approach of effective yield strength/effective area and may be recommended for use in engineering design.
出处
《建筑钢结构进展》
北大核心
2013年第2期1-5,共5页
Progress in Steel Building Structures
关键词
柱段试验
轴压杆件
残余应力
局部屈曲
相关屈曲
stub-column test
axially compressed member
residual stress
local buckling
interactive buckling
