纵向焊接铝合金构件的试验和设计研究

大多数结构用铝合金通常要经过热处理或加工硬化以得到比退火状态更高的力学性能。这种合金焊接后,焊接热会使焊缝附近局部区域(称为热影响区HAZ)强度降低。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,热影响区宽度也比铝合金小得多。这将使焊接铝合金构件的设计变得更为复杂。由于我国目前还没有关于铝合金结构的设计规范,为此本文通过试验研究及对已有试验数据的分析,并在参考国外规范的基础上,提出了纵向焊接铝合金构件的设计建议公式,并将公式计算结果与试验结果进行了比较,两者吻合较好,从而验证了建议设计公式的适用性。

Tests and Design Study on Welded Aluminium Members with Longitudinal Welds

Most aluminium alloys used for structural purpose are either heat treated or cold worked in order to develop higher mechanical properties than exist in the annealed temper. When alloys with enhanced properties are welded, the heat of welding reduces the strength in localized regions (named heat affected zone) in and immediately adjacent to the welds, which will normally not happen to structural steel except high strength steel.This makes the design of welded members become more complicated. Since there is no code for aluminium structures in China, this paper provides design suggestion for longitudinal welded aluminium members on basis of tests and analysis of the existed data with referring relevant foreign codes.Comparison between the design results and the test ones is made,which are in good agreement with each other.