Table 2: Size and performance of the composite truss members.

Location (mm) × numberED (mm) (mm)IFEDFIFSFCFBSF

Chord2800 × 210482002507967182.9
Vertical 1292 × 37682537.55643028
Diagonal 1500 × 476856855642242.6

: length; ED: external diameter; : thickness; IFE: internal force under a 20 t external load; DF: designed internal force under external load and dead weight; IFSF: internal force for strength failure; CFB: critical internal force for elastic bulking; SF: safety factor.