600-217Section 654 — Breakaway Sign Supports
654.1Description
1 Furnish, fabricate, and install breakaway sign supports. Remov e existing I -beam breakaway supports , and refurbish and reinstall the existing supports.
654.2Materials
654.2.1 General 1 When I -beam is used in these specifications and the Plans relative to breakaway sign supports, I -beam denotes a “W” or “S" section beam as defined in the AISC Handbook . Use materials and practices in fabrication according to I-beam breakaway post found in the Standard Drawings .
654.2.2 Structural Design 1 Other than those with sizes detailed on the Plans, design breakaway sign supports required by the Plans conforming to the latest AASHTO Specifications for the Structural Supports for Highway Signs, Luminaires and Traffic Signals . Use a wind speed of 90 mph for design unless otherwise noted on the Plans or in the Specifications.
654.2.3 Perforated Fuse Plates 1 Where supports are vulnerable to being struck from either the front or back or at locations noted on the Plans, use perforated fuse plates of the type shown on the Plans and Standard Drawings in lieu of the standard fuse and hinge plates.
654.2.4 Required Drawings 1 Before fabrication of the I -beam breakaway posts, verify all field dimensions and sign locations with the RCE . Submit an electronic copy of Shop Plans and Working Drawings to the RCE for review. Indicate the following information on the drawings — the I-beam sizes, lengths, weld sizes, bolt sizes, details for hinge and fuse plates and slip bases, and a procedure for erecting the supports. 2 The Director of Traffic Engineering will review the drawings as rapidly as possible and either approve them for fabrication or return them for corrections as noted. If corrections are required, provide a corrected copy to the Director of Traffic Engineering for the file.