Analysis on Flexural Capacity of Square Steel Tube Truss Concrete Beams with Grouted Chords

Table 2

Parameters of FEA models.

Analytical parameters	Range of parameters	Description
Concrete strength grade	C30; C45; C50	fcuk: 30 N/mm^2, 40 N/mm^2, and 50 N/mm^2
Steel ratio of upper chords ()	0.43%; 0.63%; 0.83%	Area: 232 mm^2, 342 mm^2, and 448 mm^2
Steel ratio of lower chords (ρa)	1.64%; 2.13%; 2.56%	Area: 888 mm^2; 1152 mm^2; 1400 mm^2
Spacing of truss joint (s)	200 mm; 250 mm; 500 mm	—