7 stories mid-rise. 5

[mronlinetutor]

This is a 7 stories mid-rise building. Steel moment frame for girders. Beams are simply supported on both ends. Beam end released. Stairs momently framed. Lift momently framed. Parking is actually floor beams that are simply supported on both end and beam end released.

This building is far from being built. It is still in the conceptual stage where I am acting as a conceptual designer, preliminary architect, preliminary engineer, and draftsman. Due to my lack of experience, I have to ask senior engineers to help me to design this building. This building will eventually be given to prominent architects and engineers for a redesign.

I am using Midas Gen 2014 and Can-S16-01 Canadian Code for design. I have girders, columns, and bracing that do not pass the code check by Midas Gen 2014. I know how to do the code check but I don't know how to do the optimal design. Enclosed is some information on my project and my questions are: "How to get all the steel members to pass the code check. For the girders, columns, and bracings, Midas gen cannot find a replacement section from the code to satisfy the code check. In columns and bracings, Midas Gen 2014 set the tensile strength to Fy=0 because I defined them as solid sections. I later use a very large column from the American code and Midas Gen 2014 gives them a tensile strength of Fy=50ksi, but the column and bracing's area does not have any larger area sections that can replace. I guess I can try them as a built-up member.

I have enclosed the Midas Gen 2014.mgb file and the related Docx files.

Please comment on them.

disclaimer: all calculations and comments must be checked by senior engineers before they are taken to be acceptable.

 

[PropertyGuy67]

My comment would be this: I'm not so sure you can sell units with a CAD drawing of a structural frame. Maybe it's different in Canada. In Manhattan, the architect's offering memorandum package is what does the initial selling. Facade elevations, floor plans, finish schedules, appliances and fixtures, MEP descriptions. Maybe a street view rendering. Basically a complete OM, from an architectural firm. Not a set of structural drawings from the engineer.

 

[dik]

"Will you do it "on spec?""... not in this instance, I'm not familiar with your codes or requirements, but, I've often provided information on the perchance there may be a project in the offing.

Dik

 

[r13]

Depending on the intent use of this building, I think the first thing is to have a floor plan, from that, then you can start to plan structural arrangement in a realistic manner. Also, I noticed the diagonals on the original steel framing seem laying too flat (width >> height), which may have contributed to the inefficiency. You should try another model with 15' story height, and narrow down the bay width(column-column spacing). If single diagonal does not work, can you consider use X bracing?

 

[JLNJ]

It sounds like you have no earthly idea what you are doing, either architecturally or structurally.

The developer might as well just square foot it and call it good.

 

[canwesteng]

You should expect to spend money on basic engineering and architecture before going for pre-sale. I would hope no one would touch this job on spec, partly because it should never be expected to do engineering for free, and partly because it should be obvious to anyone in the industry that you are set up to fail. If you don't have financing to develop the property, you should considering either selling the land, or partnering with someone who does.

 

[mronlinetutor]

"The height of each story is based on the ceiling height of the rooms plus the thickness of the floors between each pane. Generally, this is around 14 feet (4.3 m) total; however, it varies widely from just under this figure to well over it. Stories within a building need not be all the same height—often the lobby is taller,..."

from Wikipedia.

I disagree with you canwesteng and JLNJ. Everyone should start somewhere. If you don't start to do something somewhere sometimes, you won't be able to do anything. But thanks, I am cautioned.

I am going to make the stories 14' high with 30'x30' column grid for 7 stories high building. The lot size is changed.

disclaimer: all calculations and comments must be checked by senior engineers before they are taken to be acceptable.