纵向焊接铝合金梁承载力研究

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.这一特点使得焊接铝合金梁构件极限承载力的研究与焊接钢梁构件相比变得更为复杂.由于我国目前还没有关于铝合金结构的设计规范,为此本文对两种典型的纵向焊接工字型截面铝合金梁构件进行了试验研究,并在参考国外规范的基础上,提出了适用于静力设计的纵向焊接铝合金梁设计公式的建议.通过对试验构件进行数值分析,验证了有限元分析焊接梁的可靠性.在此基础上进行了大量的数值分析,并将试验结果及有限元计算结果与公式计算结果进行了比较,可以看出建议公式计算结果富有较大安全度,从而验证了其适用性,为我国《铝合金结构设计规范》的编制提供了依据和参考.

Study on Carrying Capacity of Beams with Longitudinal Welds

Most aluminium alloys used for structural purpose are either heat treated or cold worked in order to develop higher mechanical properties.When alloys with enhanced properties are welded,the heat of welding reduces the strength in localized regions(named Heat Affected Zone)and immediately adjacent to the welds,which makes the study of carrying capacity of welded beams become more complicated.Since there is no code for aluminium structures in China,the tests were done for two typically I-shaped sections aluminium beams with longitudinal welds and by reference to foreign codes,and the design suggestion for longitudinally welded aluminium beams was provided,which is applied to static design.Numerical analysis for the test beams validates the reliability of finite element used for analysis of welded beams.Based upon this,lots of numerical analysis were done and the comparison was made among the results of test.The numerical analysis and formula suggested which shows the latter is safe enough,thus validates it's applicability.The basis and reference are provided for Design Code of Aluminium Structures in our country.