Thank you, this will help alot. The first thing I see at a glance is that they have a diagram with both flanges braced of the I-beam. Now I know if it is a compact section it won't be a concern but the aluminuim I am working with is slender and even though it is a box beam/column it is...
I am running through some calculations on an aluminum structure. In the longitudinal direction it is a braced frame and the lateral direction it is a moment frame. The frame is not the typical column/ beam connection. The column I believe would be what they refer to as a lean to. Where it is a...
Willard3, I love how you assume that I have not contacted another engineer. Is that not another area of ethics, that you should not assume! You must know everything in detail before you accuse someone of being unethical. I have in fact contacted another engineer who actually designed the system...
...are positioned parallel to 45degrees to the prevailing winds. This would cause a reduction in the CFM drawn through the free area based on 88*Cv*A*U. Cv would drop from .5 to .25. However, does this equation state still apply when you have a mechanical exhaust pulling through the air?
Here...
BAretired, thank you that is exactly what I found. IIB is noncombustible material with no specific fire rating, IIIB must have a designated fire rating. Basically the site has another building that is within 5ft of our structure and they are trying to consolidate the buildings so they don't need...
I have a contractor telling me that I am responsible as the structural engineer for determining if we can switch from a IIB construction type to a IIIB. Is this correct, I see this as an architectural item, aside for designing the structural members for any loading due to fire.
We currently have a building that is classified as a construction type IIB, the client wants to change it to a IIIB because he has another structure sitting 5ft away that has a type IIIB classification. The code official told him to just make our building (IIB) a IIIB structure my question stems...
It is a bearing connection. The load that enduces a moment, in detail 2 is from a vertical column. This then is fit up to the pipe section in detail 1. The inside diameter is 1.06, a 1" bolt is then inserted through the pipes and torqued to requirements. So yes it is so that a fixed connection...
Follow the link for a sketch. Thank youhttp://files.engineering.com/getfile.aspx?folder=7a6b0548-340b-4e42-910e-274d2e0ed099&file=doc00353020120919095307.pdf
...resisted by the torque requirement of the bolt to achieve the proper friction value.
The load is almost a joke at .5K giving you a moment of 1.25K*in = 1.25" couple force given a 1" inside diameter. The slip resistance on a 1" diameter bolt = 33.9K. Am I missing something, Does anyone see a...
What type of fabric structures are you looking at? Air inflated,Tensioned, architectural, temporary, or permanent? I myself work with tensioned fabric structures and would be happy to help you with any questions you may have. The ASCE has just released a new book ASCE 55-10 that may help you...
I have a question regarding Thermal breaks on Steel buildings. I am not sure if a mechanical engineer usually deals with this but since it affects R values and hvac performance I figure that it would be a HVAC topic. If you have a steel building with roof and walls with R values of r-30, instead...
She - and yes, I am speaking of a passive/ natural air system. When I size my intake and exhaust louvers for a passive system it only uses free air specs so I need to calculate my req free area based on the ASHRAE code.
For example, on a residential crawlspace you have to meet a min req free...
I was hoping soemeone could point me in the direction of where in ASHRAE does it dictate free air space requirment calculations. I ran the calcs for CFM but the client wishes to install a passive system. So the CFM calc means nothing, right?
CFM = Volume *3/60 (3ACH/60min/hr) = 80CFM
Yeah, there are additional characters but they all have relatively the same chemical composition and they didn't give me these characters so I was just assuming worst case scenario where there are larger discrepancies btwn the two materials.
Thank you all.
I did compare the two and found the differences as noted above. My question as to rather the chemical composition of the S355 having a Mn content of nearly .25% more than the A572 is still in question. Also the Si,Cu and N values of the S355 are higher than the A572.
I am not sure what the...
My international supplier is substituting S355 for A572 grade 50 that was originally specified. I am running through the properties and noticed that the S355 has higher Mn, Si, Cu and N values at 1.6%, .55max,.55max,.012max (respectively) compared to 1.35%, .40,0,0.
I believe this is a...
Thank you qcrobert,
So the Id doesn't necesarly have to be a grade, it could be a code that the fabricator has on record. For example, they could use F for the ID and as long as they have a log of what the F represents ie; grade A500 steel. They would be compliant?
