Phil
REGISTERED
What is the process that the IBC uses to approve errata proposals. I would like to know because I thought errata was only used to correct errors rather than make substantive changes.
I am curious about the reasoning behind the 7/19/12 change to 1603.1.4.5 of the 2012 IBC. Prior to the errata, the construction documents needed to include the design wind pressure for components and cladding not designed by a registered design professional (any SE). The errata changes this to be the components and cladding not designed by the register design professional responsible for the design of the structure (SEOR). Until now, the language of this section has not changed since the beginning of the IBC in 2000.
The components and cladding wind loads in ASCE 7 are complex. The load varies whether it is acting toward or away from the structure. The load varies depending on the size of the component. The load is different at corners of the building. Parapets have different loading. Rooftop equipment has different loading. The code allows different methods to calculate the load that yield different results. It is very difficult to list all of the different loads on the construction documents In the past, the SEOR could put some conservative loads on the construction documents and allow the contractors engineer (typically a subcontractors such as a curtain wall manufacture) to sharpen their pencil during design.
The errata is at http://www.iccsafe.org/cs/codes/Errata/2012I-Codes/2012IBC/2012-IBC-z-Complete.pdf. To me, this change seems substantive rather than correcting an "error" that has been in the code for so many years.
new
5. Design wind pressures to be used for exterior component and cladding materials not specifically designed by the registered design
professional responsible for the design of the structure, psf (kN/m2).
old
5. Components and cladding. The design wind pressures in terms of psf (kN/m2) to be used for the
design of exterior component and cladding materials not specifically designed by the registered design
professional.
I am curious about the reasoning behind the 7/19/12 change to 1603.1.4.5 of the 2012 IBC. Prior to the errata, the construction documents needed to include the design wind pressure for components and cladding not designed by a registered design professional (any SE). The errata changes this to be the components and cladding not designed by the register design professional responsible for the design of the structure (SEOR). Until now, the language of this section has not changed since the beginning of the IBC in 2000.
The components and cladding wind loads in ASCE 7 are complex. The load varies whether it is acting toward or away from the structure. The load varies depending on the size of the component. The load is different at corners of the building. Parapets have different loading. Rooftop equipment has different loading. The code allows different methods to calculate the load that yield different results. It is very difficult to list all of the different loads on the construction documents In the past, the SEOR could put some conservative loads on the construction documents and allow the contractors engineer (typically a subcontractors such as a curtain wall manufacture) to sharpen their pencil during design.
The errata is at http://www.iccsafe.org/cs/codes/Errata/2012I-Codes/2012IBC/2012-IBC-z-Complete.pdf. To me, this change seems substantive rather than correcting an "error" that has been in the code for so many years.
new
5. Design wind pressures to be used for exterior component and cladding materials not specifically designed by the registered design
professional responsible for the design of the structure, psf (kN/m2).
old
5. Components and cladding. The design wind pressures in terms of psf (kN/m2) to be used for the
design of exterior component and cladding materials not specifically designed by the registered design
professional.