Appeal 33529

2019 OSSC 703.3, Item 4

The application of any of the methods listed in this section shall be based on the exposure and acceptance criteria specified in ASTM E119 or UL 263. The required resistance of a building element, component or assembly shall be permitted to be established by any of the following methods or procedures:

1. Engineering analysis based on a comparison of building element, component or assemblies’ designs having resistance ratings as determined by the test procedures set forth in ASTM E119 or UL 263.

Allow intumescent coating as approved protection of steel brackets connected to supporting structure at pedestrian bridges for a 1-hour fire-rating based on comparison to ESR-5314. This is a reconsideration of Appeal 33497.

49.42 mils of Contego HS High Solids intumescent coating will be applied to ½-inch steel plate welded connection brackets. The brackets are part of support and compensate for bridge movement during wind and earthquake forces. The protection is designed for a 1-hour rating based on ESR-5314.

This appeal compliments Appeal 33415 to address additional conditions regarding the compliance of the building’s pedestrian walkways with OSSC Section 3104.3 using intumescent coating to achieve the required 1-hour fire protection. The steel beams were addressed and approved in the prior appeal (33415), and this appeal addresses the connections for the skybridge. To document the fire protection 1-hour equivalency, Franklin Callfas, Oregon registered FPE, has prepared the attached engineering judgment analysis. See 1-EJ3 - Bridge Connections-REV0A attachment.

RECONSIDERATION TEXT
Expansion of the IFRM at the pinned connection will envelop the bolt and gap completely. IFRM expands roughly 50x the original dry film thickness, per manufacturer's data, to protect the bolt and gap at connection and exposed surfaces. Fig.2 on EJ#3 is provided to simulate 2” extent of IFRM expansion upon heating.

2019 OSSC 703.3, Item 4

The application of any of the methods listed in this section shall be based on the exposure and acceptance criteria specified in ASTM E119 or UL 263. The required resistance of a building element, component or assembly shall be permitted to be established by any of the following methods or procedures:

1. Engineering analysis based on a comparison of building element, component or assemblies’ designs having resistance ratings as determined by the test procedures set forth in ASTM E119 or UL 263.

Allow intumescent coating in combination with gypsum wallboard as approved protection of steel plates at the exterior walls for a 3-hour fire-rating based on comparison to ESR-5314 and OSSC 722. This is a reconsideration Appeal 33497.

Fire protection for the 3-hour rated steel plates will be provided by additive fire protection methods. A layer of gypsum wallboard (1-hour equivalency) will be provided atop a 2-hour equivalent thickness of Contego HS High Solids intumescent coating applied per the attached engineering judgment analysis.

This appeal compliments Appeal 33415 to address additional conditions regarding the compliance of the building’s pedestrian walkways with OSSC Section 3104.3 using intumescent coating plus gypsum wallboard to achieve the required 3-hour fire protection for the primary frame. To document the fire protection 3-hour equivalency, Franklin Callfas, Oregon registered FPE, has prepared the attached engineering judgment analysis. See 1-EJ4 - Column protection-REV0A attachment.

RECONSIDERATION TEXT:
Detail 1 in EJ #4 has been revised to show 5/8” Type X GWB layer extended over the 8” wide steel plate for full 3-hour protection. The GWB layer will be attached with screws to the wall framing on each side of the 8x8 plate.