论文部分内容阅读
为研究铝合金工形截面轴压构件的局部稳定性能,对15根工程中常用大截面铝合金6061-T6和6063-T5轴压短柱试件进行试验研究,并对12组48个材性试样进行拉伸试验。研究了材料的力学性能、试件的局部几何初始缺陷、变形性能、局部屈曲荷载、轴压承载力等,并将试验结果与各国规范中设计方法计算结果进行对比。试验结果表明:铝合金6061-T6强度与普通钢材相当,但延性较差;铝合金挤压型材的局部几何初始缺陷很小,远小于规范中给定数值;板件宽厚比越大,局部屈曲发生越早,破坏时材料的强度越得不到充分发挥,但是局部屈曲后材料强度仍有较大的提高;翼缘和腹板之间存在相互作用;中国规范、欧洲规范、美国规范和澳大利亚/新西兰规范均低估了试件的轴压承载力,其中美国规范计算结果与试验结果最接近。因此,对于板件宽厚比大的试件,应充分利用其屈曲后强度,各国规范得到的承载力计算结果均较保守。
In order to study the local stability of axial compression members with cross section of aluminum alloy, the specimens of 6061-T6 and 6063-T5 axial compression short columns commonly used in large-section aluminum alloy of 15 projects were studied. Twelve groups of 48 materials Tensile test specimens. The mechanical properties of the material, the initial local geometric imperfections, deformation properties, local buckling load, axial compressive bearing capacity of the material were studied. The experimental results were compared with those of the design methods in different countries. The experimental results show that the strength of 6061-T6 aluminum alloy is equivalent to that of ordinary steel, but the ductility is poor. The local geometric initial defects of aluminum alloy extruded profile are small, far less than the given values in the specification. The earlier the material damage occurs, the less the strength of the material can not be fully exerted. However, the strength of the material after partial buckling is still greatly improved. The interaction between the flange and the web is the same. The Chinese Code, European Code, American Code and Australia / New Zealand norms are underestimated the axial bearing capacity of the specimen, which the United States normative calculations and test results closest. Therefore, for the specimen with a large aspect ratio, the buckling strength should be fully utilized, and the calculation results of the load-bearing capacity of all countries are more conservative.