Schwarz
View current page
...more recent posts
my first exposure to python happened in dallas. live appearance (after a first season) in 1975 on kera - i distinctly recall the armadillo bit
via zoller
sailboatescape tells it:
BJC,
Sounds as if you have been a mostly silent but studious reader with real plans to do something of significance. It also is apparent you wish to do it in the best possibly way and I personally applaud your approach. Since you state you are designing it and then handing it over to an engineer, I assume you have a general knowledge of what might and might not work in a structure.
Re engineering of containers is a tiny business in the world of containers with only a handful of experienced firms such as TAW. I believe these firms are usually making modifications to containers that must then be recertified to be handled (and presumably stacked) in the world wide transport system—a hugely different undertaking than modifying it to be used in a dwelling structure. However, that’s not to imply that modifications made to use them in housing is easy to analyze and those modifying containers for use in housing is an even smaller group. I haven’t started building yet but I have also been studying and researching everything I can in preparation and will gladly share what I have learned. A lot of it is from this forum, most notably David Cross’s generous sharing of knowledge.
I know of four basic references: MIL-HDBK-138B which is the DEPARTMENT OF DEFENSE HANDBOOK GUIDE TO CONTAINER INSPECTION FOR COMMERCIAL AND MILITARY INTERMODAL CONTAINERS. Next is Rules for Certification of Cargo Containers from the American Bureau of Shipping. I found both of these as downloadable PDF files on the internet. I apologize as I did not make a note of where I found them. I remember the military guide was easy to find and the ABS was buried on their website.
The more definitive reference is ISO 1496-1. As far as I know this is not available for download anywhere and a copy is about $90. However, some large libraries will have it and the one in my small town participates in a loan program where they were able to obtain it for me. Lastly and most importantly will be the reference books your engineer will have for steel structural members, as that is how he really should be looking at this.
Another thing to keep in mind is the prescribed specifications for cargo containers give some leeway in how those specifications can be met. The top rail on one container may be different than another but both work as long as the resulting container meets the specifications. However, the modifications to one container may need to be different than what you would do on a different container to get the same results. David Cross would be qualified to address this, but I think you are going to have to know the specifics of the containers you intend to use before your engineer can do the calcs.
As both David Cross and Greg La Vardera have pointed out here before, every house will be different. Most 40’ containers are designed to carry a load of just under 60,000 pounds. A residential structure is designed for a floor load of 40 pounds per square foot which is only 12,800 pounds for that 320 square foot container. That 40’ container is designed to carry that load on four corners, most conventional house designs can easily have piers or foundations supporting sections of the container as needed. David has pointed out before that much of the reinforcing he does at TAW on modified containers is so they can be transported. If you can set yours in place and modify them on site that will also increase your flexibility in making them strong enough to exceed the requirements of a residential structure. From a design standpoint, not making a lot of modifications (or adding reinforcements where you do) allows you to use them to do overhangs and cantilevers that would be difficult to achieve with conventional construction.
Based on the conversations I have had with structural engineers, we will not approach it from what a container is designed to carry (other than to recognize that it is an incredibly strong structure that can easily take a good bit of modification). The initial designs and proposed supports etc. will be my work based simply on a working knowledge of designing and building conventional structures, gained over years of experience. When I am designing a house and incorporate something that must have an engineers seal, I do not go to an engineer and ask them to design the structural portion. I design what I think will work and take it to them to for an analysis. Most of the time it is acceptable and if not, they tell me how to change or modify what I propose. For my house designed with IBUs, together we will then look at the structure as a dwelling and how strong does it need to be to carry the prescribed floor loads, perform under seismic and wind loads, etc. He will then make an analysis of areas that appear to be of questionable strength due to proposed modifications to see if they are adequate in how I propose they be supported, reinforced, etc.
The question that keeps getting asked on this forum is how much can you modify a container and the experts keep giving the same answer—each one is different. Ask an engineer how much you can modify a container and it still be strong enough would probably be a very expensive question (in engineering fees) as there would be hundreds of “it depends” answers. If instead you are taking him (or her) a design and asking, “will an opening of such and such a size, placed here, with a remaining corrugated steel plate of this thickness above, a steel beam of this size below and a reinforcing frame welding around the opening of this section, be adequate at this place in the structure considering the prescribed loading conditions?” He can sit down with his tables and computer and give you an answer. If he starts with the most questionable areas first he will quickly become familiar with what the parts of the container are and their capacities and move on through his analysis.
Keep sight of the fact that I an starting with the premise that it is probably designed adequately and that my engineer is being engaged to examine that design, make recommendations if he finds areas that are not acceptable and then certify it.
Keep us posted and give us more details, not only on your design but your geographic area in terms of climate, building and zoning codes. Etc.
the elevators - your gonna miss me - dell is using this as advertising music n how do you make a psychedelic video in black and white?
via jschw
samuel adams ~ psychogeography