Optimum design of welded aluminium structural parts with fatigue constraints

摘要

The aim of the present study is to show the optimum design procedure of welded aluminium structural components subject to fluctuating forces in addition to permanent static loads. Four illustrative numerical examples are given: a square hollowsection (SHS) compressed strut connected to gusset plates, a circular hollow section (CHS) compressed strut with a welded splice, a cantilever I-beam with fillet welded connection to a column and a box a SHS strut cyclically loaded by tension-compressionand welded to gusset plates, the optimum width and thickness can be calculated considering the fatigue and local buckling constraints. The fatigue stress range of welded aluminium joints is determined according to BS 8118. A CHS strut with a welded splice is designed for fatigue stress range of tow cracking of the connecting fillet welds and the required weld size is determined on the basis of root cracking. Similar design aspects are applied to the optimum design of a welded I-section cantilever beam.