Chapter 2: General Information
Overview
1. All A325 bolts in splice connections are to be tightened by the turn-of-the-nut method. Bracing bolts
are to be “snug-tight” only.
2. All GSI provided steel is hot dipped galvanized per ASTM-123A/123M.
3. No bridge members can be removed at any time unless it was designed for it. Drawings will show
exact layout of members and how they are to be installed.
4. No tower members can be removed at any time unless it was designed for it. Drawings will show
exact layout of members and how they are to be installed.
Required Specifications
1. Steel W sections are ASTM A992, A709 or A572 Grade 50.
2. Steel channels, angles and S sections are ASTM A36.
3. Steel HSS is ASTM A500 GR B, 46 KSI.
4. All structural bolts are A325 unless otherwise specified.
5. All field welds are 3/16 in. (0.48 cm) min. size fillet weld E60XX or E70XX.
6. All grade 8 bolts are to be installed in snug-tight condition.
Hole Preparation
1. Since GSI steels are galvanized, bolt holes may be smaller than the requirement due to the build up
of galvanizing around the holes.
2. The bolt holes are usually 1/16” greater than the bolts in diameter.
3. The holes may be deburred so that the bolt can be inserted through the holes.
14
PNEG-2115
2-Leg and 4-Leg Towers
