Abstract
Compression steel circular and square hollow section (CHS and SHS) struts are optimized and compared to double-angle section ones showing the advantage of CHS and SHS struts (Section 6.2.1). It is shown that the optimum geometry of trusses depends on the shape of compression members (Section 6.2.2). Optimum design of tubular members with welded joints loaded in fatigue is treated in Section 6.3. Absorbed energy of CHS and SHS braces cyclically loaded in tension-compression is determined by closed formulae for hysteresis loop area (Section 6.4).Compression aluminium-alloy CHS and SHS struts are optimized and it is shown that struts optimized considering the initial imperfections are practically safe and insensitive to imperfections (Section 6.5). CHS beams are optimized for bending in elastic and plastic range and stated that, in plastic range, it is more economic to design these beams without local buckling (Section 6.6). Minimum cost design of SHS Vierendeel trusses gives the optimum number of bays (Section 6.7). In the minimum cost design of a plate structure with rectangular hollow section (RHS) stiffeners the constraint on residual welding distortions is considered.
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