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Dear All I am not clear on upper limit of1.4 on the second to primary moment ratio. M2nd-order=< 1.4M1st-order. the question is which moment ( M2nd-order (Pdelta(big))(Sideway only) or M2nd-order (P delta(big)+delta(small))(Sideway+slenderness effect) )to compare with M1st-order? Thank you

Oh thank Josh ,my English bla bla... xD it means in case our section design fail then we try to enlarge less than 10%, so we don't need to re-analysis. yet if the section change more than 10% then we need to re analysis.

Dear Everyone I am not sure about this section in ACI318-19"6.7.1.3 The cross-sectional dimensions of each member used in an analysis (Linear elastic second-order analysis) to calculate slenderness effects shall be within 10 percent of the specified member dimensions in construction documents or...

Dear all between Pa=0.25*f'c (In foundation Book) and Pa=0.3f'c x Ag+0.4fy x As (ACI318) what should I use? Thank you

Thank Tomfh and can you share experients on System of Supporting Structure we direct using beam column and slab or use Isolation system ?

@Tomfh please share me some document Big thank you

Dear all I have question on design load of Helipads as per ASCE7-16 1.Should we apply load of Helicopter only (1.92kPa/2.87kPa)? and how about effect wind from Helicopter? [Pic-1] 2.Other section 4.11 in ASCE state that 2 kinds of apply concentrated load: 2 single concentrated loads (2.44m)...

Dear everyone Could you explain me picture below in CSI Etabs to performant quasi-static Analysis ? Thank you

Dear all What is quasi-static analysis? Do some software such Etabs, Robot Structural Analysis have it or not? Thank you

Blackstar123: which standard referent ?Blackstar123

Dear All what mass combination (Masssource) for calculate frequency of building? Thank you

Dear all What reason for this cracking after casting concrete? (Attachment file) What solution for cracking ? Thank you 🙏

Thank you all Ron it means when curing stage we watered the concrete more than w=0.88kg/m^2/hr ? Right?

Ron after we know that w=0.88kg/m^2/hr, what do we do at site?

hello Everyone why we need calculate the evaporation rate of surface ? when we know it what will we do at site? (attachment file) thank you

Hello everyone please explain me about the Note: ' * IN CASE OF THE DEPTH OF FOUNDATION AND TIE GIRDER ACCOMMODATE DEVELOPMENT LENGTH OF COLUMN, STANDARD 90 HOOK SHALL NOT BE APPLIED" ? thank you

Yes thank you I post it already but no solution and then I go forum

Hi all How to model beam with 2 different slab level in etabs? Thank you

Cracked Section reflect the shrinkage, shortening of members... then stiffness loses and will be weaker than the original

Hello All How to model Beam with 2 Difference Level Slab in Etabs? and make sure it work properly as real-life structure? (as attachment) Thank you! https://files.engineering.com/getfile.aspx?folder=1f72007e-a585-4dbf-8baa-b3bbd7fcb24b&file=2_Difference_Level_Slab.png