UFC 4-023-03
25 January 2005
2. Structures designed to a Low Level of Protection (LLOP) where vertical
structural element(s) cannot provide vertical tie force capacity and the
alternate path (AP) method is utilized to bridge over the deficient element(s).
3. Structures designed to Medium Level of Protection (MLOP) or High Level of
Protection (HLOP).
1717.2 [Addition] Structural steel. Continuous special inspection for structural welding
in accordance with AWS D1.1, including floor and roof deck welding.
1. Single pass fillet welds not exceeding 5/16" (7.9mm) in size.
1717.3 [Addition] Structural Wood. Periodic special inspections during nailing, bolting,
anchoring and other fastening of components within the progressive collapse resisting
system, including horizontal tie force elements, vertical tie force elements and bridging
elements.
welding operations, screw attachment, bolting, anchoring and other fastening of
components within the progressive collapse resisting system, including horizontal tie
force elements, vertical tie force elements and bridging elements.
1717.5 [Addition] Cast-in-place concrete. Continuous special inspection for
reinforcing steel placement with a particular emphasis on reinforcing steel anchorages,
laps and other details within the progressive collapse resisting system, including
horizontal tie force elements, vertical tie force elements and bridging elements.
1718 STRUCTURAL OBSERVATIONS
1718.1 [Addition] Structural observations. Structural observations shall be provided
for the progressive collapse resisting systems as follows:
1. When the contracting officer requires such observation.
2. In structures designed to Medium Level of Protection (MLOP) or High
Level of Protection (HLOP).
The structural engineer of record (SER) should perform the structural observations as
defined in Section 1702. In lieu of the SER, a registered design professional with
experience in and knowledge of structural engineering principles and practices shall
perform the structural observations.
G-4
Previous Page
