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Tomfh (Structural), May I ask water makes "black stains"? I thought water makes rust brownish marks? Shall I do anything about it? Is it bad? Thanks

Colleagues Anybody know what these marks might be? Are they black mold???? Thanks https://files.engineering.com/getfile.aspx?folder=c11c6c1f-35a5-4b21-bb87-74057dadcc3a&file=Black_marks_on_steel.pdf

Any pics you possibly can share?

atrizzy, May I ask what's the size of your building by the way? And is it in high seismic or costal location? Is it at middle of a populated town or out nowhere in a farm?

Thank you Littlelnch Do we have such thing from FWHA in US or any ASCE publications or DOT publication such as the one from UK? Thanks

Anybody knows of a publication or video helping me to size a steel road plate? Thank you

Ignor the bracing and assume a completely free top end column

Milkshakelake, Did you execute any correction or remedy to the column? I don't know my idea will be too late?

Did you get it fixed?

OP, How old is your building? What is the building a multi story garage? How many total stories and what floor this column is located on? Are you in high seismic region? What are the deminsions of lower and upper columns?

This question has not been posted on Aerospace people forum. And no need to be rude and insulting if you think the question is way below your expertise. No one has forced you to respond. Be professional rather than rude. People are communicating with different level of knowledge and experience...

Thank you so very much for your support and statement IDS.

HTURKAK, Thank you so very much. Very well done and explained. Greatly appreciate it for the photo of hand calculation. Your method is justifying and yes you did not mess with units. Greatly appreciate it. Sincerely BFStru

Gentlemen The strain function is epsilon sub x. It is Not epsilon times X. Epsilon sub X denotes the strain function along X axis which is the longitudinal axis of the bar.

HTURKAK Thank you for your response but I got a question for you. Sorry I don't have symbols to write mathematically but the arguee is the delta L you found shouldn't be multiplied by the original length of 300 CM ? I arguee that the 9 CM is your total strain. And strain = delta L / L So you...

No sir, this is a simple straight rod only under axial loads that has caused governing axial strain equation as introduced above. We are seeking the end B ( X= 3 m) axial deformation.

ChorasDen (Structural) Assume due to an unknow loading (however axial for sure)has caused this strain equation governs for the bar. How can you get the displacement of point B in this rod having this strain equation?

Also X in the strain equation represent all point along length of the bar.

Struct123ure (Structural) Thank you for your response. However that is the strain equation given to us and it is 0.01 times X to the power of two. I am not sure what value you got for epsilon? However 3 cm is not a correct answer !!!

Hi We are in debate in office on the correct answer to this problem: A uniform straight rod AB (A if fixed, B is free end)with total length of 3 meter is under some axial loads that causes strain of Ɛx = 0.01x^2 What is the axial displacement of the end B in terms of centimeter? Interesting...