摘要
铝合金作为一种新型结构材料,在现代建筑中得到了越来越广泛的应用。国内目前关于挤压型材已经进行了大量研究,但有关焊接铝合金构件的研究很少。由于铝合金焊接后受焊接热影响较大,试件中除了产生残余应力,在焊缝附近的局部区域材料强度还将大大降低,该区域被称为热影响区(HAZ)。而对于钢结构,由于其热导率比铝材小得多,因此,只有高强钢才可能产生强度降低的热影响区,而且其强度的降低没有铝合金显著,热影响区的宽度也比铝合金小得多。这将使得铝合金受压杆件的承载力研究变得更为复杂。为此,对贴脚焊工字型铝合金中心受压杆件进行了试验研究,并将试验结果同即将颁布的国家标准《铝合金结构设计规范》及《欧洲铝合金结构设计规范》(EC9)进行了比较。研究表明,通常情况下,对于贴脚焊构件,《规范》计算值和试验结果吻合较好。
Aluminium alloy as a new type of structural material, is more and more widely used in modern architecture. Now much study is done on extruded aluminium alloy members, while little is done on welded ones. Aluminium alloy welding will induce residual stress, what＇s more, reduce the material strength significantly in a localized region, known as the heat -affected zone （HAZ） softening, which will normally not happen to structural steel except high strength steel, for which such a reduced strength zone may however occur, the strength is not so drastically reduced as for aluminium alloy and the width of the heat-affected zone is much smaller due to the difference in heat transfer. Thus, experimental study of longitudinally welded I-section aluminium alloy colmnns subjected to axial compress is conducted. The test strengths are compared with the design strengths obtained using Code for Design of Aluminium Structures （draft） and Eurocode 9 for aluminium structures. Generally, the codes predict the strengths of the double T profiles with fillet welds columns well.
出处
《结构工程师》
2006年第5期67-71,77,共6页
Structural Engineers
关键词
铝合金
焊接
工字型
热影响区
承载力
aluminium alloy, weld, I-section, heat-affected zone（HAZ）, carrying capacity
