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Free standing motor vehicle shade canopies
August 31, 2017
1:37 am
edwills2123@gmail.com
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RV Covers and Shade structures are safe and ecofriedly way of securing your recreational vehicles from harmful elements. GA Portable Building offers carports, regular rounded style RV shade structures, RV shade structures etc.

December 15, 2011
10:08 pm
stuart akagi
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You may also want to check whether Section 903.2.10.1 (IBC2009) applies.

December 1, 2011
3:53 pm
brian little
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[Image Can Not Be Found] Posted by Bruce Demaree
[Image Can Not Be Found] Posted by Brian Little

Per IBC the vehicle shade canopy clearly is a U.    

 

Clearly you haven't read section 406.1.  These are free standing, cantilevered I beam motor vehicle shade canopies that can be many hundreds of feet long.  The engineering of them is not the issue, per the post the use group and occupancy categories are.

Wow.  Where in the OP did it state that the question pertained to "cantilevered I beam motor vehicle shade canopies that can be many hundreds of feet long"?  

November 18, 2011
1:21 pm
dennis keierleber
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Thank you for the clarification. My hard copy of the '09 does have the definition but I was lazy and just using the digital version where it is missing.

November 18, 2011
12:31 pm
frank castelvecchi
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My copy of the 2009 IBC has the definition as the first one in 502.1 under "Area, Building"-- I have run into printing errors where words or sentences have been omitted before. 

Worst case I ran into was in an 84 or 87 first printing of the BOCA fire prevention code where our fire marshal's copy had one little word left out of the phrase "...shall not be required..." regarding the 65 psi requirement at the top of standpipes in low rise sprinklered buildings.  His read "...shall be required..."

If these shade structures are under 3000 sq ft they could be considered use group U carports if over 3000 sq ft in area then they would be use group S-2 Open Parking Garage.

Unprotected steel construction would be type IIB with a 50 000 sq ft per structure area limit.

I have seen these with rated walls on one side when within 10 feet of the property line.

November 17, 2011
6:03 pm
dennis keierleber
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Hmmmm---tougher question than I thought. In the 2006 IBC, Section 502.1, "AREA, BUILDING. The area included within surrounding exterior walls (or exterior walls and fire walls) exclusive of vent shafts and courts. Areas of the building not provided with surrounding walls shall be included in the building area if such areas are included in the horizontal projection of the roof or floor above."

However, although IBC 2009 Section 202 still refers one to 502.1 for a definition of building area, the definition has been removed. I don't know where it went. In some instances this definition was a problem when open sides of a building became non-allowed openings due to location of a property line, etc (your carport project, eg, or a covered bank drive through off an alley---especially with office space above). If you read 406.3.3.1, the requirements for openness of at least two sides of an open parking garage, it seems clear that the entire structure is defined as a building and would still be considered such if it were open on 3 or 4 sides.

November 17, 2011
3:29 pm
bdemaree1@sbcglobal.net
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[Image Can Not Be Found] Posted by Dennis Keierleber

...Since a building is defined by the roof, not by walls,...

While this is obviously off topic, can you direct me to where this is stated in Code?  I always thought a building was defined by its use and occupancy categories.

November 17, 2011
12:24 pm
dennis keierleber
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I agree. Group U is limited to 3000 sq ft. Group S-2 if no vehicle repair work. Since a building is defined by the roof, not by walls, the building would be an open parking garage. Rated walls may be required on one or more sides depending on location and separation.

I think you could include fire walls to split the building into individual buildings of less than 3000 sq ft but I'd guess the cost would out weigh any advantage. Both U and S-2 are in the same column in Table 602.

November 17, 2011
9:58 am
bdemaree1@sbcglobal.net
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[Image Can Not Be Found] Posted by Brian Little

Per IBC the vehicle shade canopy clearly is a U.    

 

Clearly you haven't read section 406.1.  These are free standing, cantilevered I beam motor vehicle shade canopies that can be many hundreds of feet long.  The engineering of them is not the issue, per the post the use group and occupancy categories are.

November 17, 2011
9:33 am
brian little
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Per IBC the vehicle shade canopy clearly is a U.  If tasked with the structural engineering then look at the gravity and lateral loads.  Likely wind will govern, but you must still look at gravity and earthquake loads. Gravity, wind and seismic loads are transferred to the soil via the foundation.  Are you also designing the foundation?

You call them a vehicle shade, but they are more akin to a sail.  Look at the wind loading charts for the region(s) where the carport will be located.  Design the roof to stay on the frame and the frame to resist the gravity and lateral loads.  Calculate those numbers and refine your scope of responsibility.  

 

November 17, 2011
8:39 am
gary matczak
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Carports are U - Utility

November 16, 2011
6:01 pm
bdemaree1@sbcglobal.net
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We have recently been requested to start engineering shade canopies; specifically, single level, freestanding, open on all sides’ canopies of light frame steel to serve as motor vehicle parking shade.  We hesitate to call these carports as according to IBC 2009 section 312 where carports are actually listed, it calls for use group U.  A review of Chapter 4 special detailed requirements based on use and occupancy section 406.1, regarding private garages and carports, leads us to the conclusion that this section is intended for residential types of applications and not ours. 

 

Perusing the IBC definitions we find canopies listed as:

 

CANOPY. A permanent structure or architectural projection of rigid construction over which a covering is attached that pro­vides weather protection, identity or decoration, and shall be structurally independent or supported by attachment to a build­ing on one end and by not less than one stanchion on the outer end.

 

We feel this is the best description of the type of structures we are engineering. 

 

We therefore continued to peruse the 2009 IBC chapter 3 for an appropriate use category.  The closest category we are able to find that appears to be reasonable is Section 311.3 “Low–hazard storage, Group S-2” which includes parking garages, open or enclosed.  While our structures do not neatly fit into either open or enclosed, this seems to be the best fit.

 

With the determination that Use Group S-2 is our best choice, we review Chapter 4 for the appropriate design requirements as they pertain to our engineering.  Section 406.2 is strictly for parking garages which our structures definitely are not.  Therefore, we look to section 406.3.3 for some form of guidance,

 

406.3.3 Construction. Open parking garages shall be of Type I, II or IV construction. Open parking garages shall meet the design requirements of Chapter 16. For vehicle barrier systems, see Section 406.2.4.

 

Again, since our structures do not neatly fit into this section either, we exclude the rest of this section where it addresses openings in walls and multiple tiers. 

 

We now determine an Occupancy Category of Buildings and Other Structures, reference Table 1604.5 based upon use group S-2.  We begin by looking for the definition of “Occupant” or “Occupancy” in Code.  We find,

 

OCCUPIABLE SPACE. A room or enclosed space designed for human occupancy in which individuals congregate for amusement, educational or similar purposes or in which occu­pants are engaged at labor, and which is equipped with means of egress and light and ventilation facilities meeting the requirements of this code.

 

Obviously our single level, freestanding, open on all sides’ canopies of light frame steel to serve as motor vehicle parking shade is by definition not occupiable space.  Therefore, our natural conclusion has been to now call them storage as their use group specifies; “Low-hazard storage, Group S-2”.  Section 406.3.3 states that the acceptable Occupancy Categories for construction may be of types I, II, or IV.  We know that these structures are not type IV, and are not of a mixed use type.  We have then reviewed Table 1604.5 and observe Occupancy Category 1 similarities, i.e. low-hazard and storage.

 

Buildings and other structures that represent a low hazard to human life in the event of failure, including but not limited to:

  • Agricultural facilities.
  • Certain temporary facilities.
  • Minor storage facilities.

 

We have surmised that type I design criteria is the best fit for our structures as they “have little or no human occupants”, the use group S-2 defines motor vehicle parking as storage, construction types are allowed to be I, II, or IV, there are not any attached buildings, and Code does not provide a description of the types of minor storage facilities covered in category I.  Please see section from IBC 2009 Code and Commentary, Volume 2, regarding type 1.

 

Occupancy Category I: Occupancy Category I build­ings exhibit the lowest hazard to life since they have little or no human occupants or, for those that are tem­porary, the exposure to the hazards of earthquakes, floods, snow and wind would be considerably less than that of a permanent structure. Note that this cate­gory includes "minor storage facilities," but the code does not provide an explanation of which storage facilities could be considered minor.

 

It would appear that with the lack of clarity as to what minor storage actually is, or where these motor vehicle shade structures might fall within Code, coupled with our ability to interpret other supporting information that is available within Code, that the final determination of occupancy category type would be the responsibility of the Engineer of Record.  We wish to be assured that we have logically and faithfully followed the path through Code and have accurately applied its provisions as we attempt to provide the best service possible to our clients.