Girder spacing in highway T-beam bridges may depend on various factors. When economy governs, it has been conceptionally noted that the wider the spacing, the more economy may be achieved. This paper derives from the comparative designs of highway T-b...
Girder spacing in highway T-beam bridges may depend on various factors. When economy governs, it has been conceptionally noted that the wider the spacing, the more economy may be achieved. This paper derives from the comparative designs of highway T-beam bridges following the current AASHTO provisions a formula that gives a most economical girder spacing:
B=W/(N-b)
where B: Economical girder spacing, in meter
W: Gross width of the bridge, in meter
N: Number of girders, =4W/L+a, a=(W-9)/5 for DB24 and 18, (W-4)/5 for DB13.5
L: Span length in meter, between centers of supports
b: =0. to 0.2; the smaller value gives the more economy.