FDOT Standard Plans Index 460-252: Access Door Assembly for Steel Box Sections

Design Criteria

Design Criteria Structures Design Guidelines ( SDG ) 5.6.2

Design Assumptions and Limitations

Design Assumptions and Limitations This Access Door Assembly standard is intended for use inside steel box girders to restrict access at end bents and to restrict ingress of birds and bats at end bents and between the ends of adjacent box girders at expansion joint locations. The Access Door Assembly attaches and closes against the bearing or jacking stiffeners closest to the access opening in the diaphragm. Horizontally oriented plates that are the same depth as the bearing or jacking stiffeners are required adjacent to the to p and bottom of the access opening.

These plates, in combination with the adjacent stiffeners, complete the rectangular enclosure around the diaphragm access opening that the Access Door fits against. Use this standard as a basis for developing custom proj ect specific Access Door Assemblies if the diaphragm and stiffener configurations are not compatible with those shown on the standard. The Access Door swings to the inside of the box girder which allows for the door to be completely opened.

The Access Door can be opened from both sides which is required between the ends of adjacent box girders at expansion joint locations. When located at end bents, the Access Door can be locked with a padlock located on the inside of the box girder so as to restrict access from the outside. The size of the openings in the expanded metal mesh was specifically selected to exclude the Brazilian Free - tailed Bat, Tadarida brasiliensis, but the small mesh size will also exclude other species of bats found in Florida and most, if not all, birds.

Payment

Payment The cost of Access Door Assemblies is incidental to the cost of the steel box girders they are used with. No separate payment is made. Example

What your plans must show

Plan Content Requirements for this index — the SPI's checklist for designers.

• In the Structures Plans: On the Diaphragm Detail sheets, show the Access Door Assembly on the inside of the interior diaphragm and include a cross reference to Standard Plan s Index 460
• 252. Show top and bottom plates adjacent to the diaphragm access opening consistent with the details shown on the standard. Show top and bottom plates to be the same width as the adjacent bearing or jacking stiffeners that they connect to. Complete the following data table and include it in the plans, preferably on the Diaphragm Detail sheets.
• Standard Plan s Instructions Topic No. 625