Hello all,
Very much a theoretical question at this stage. I came across E.C. Hambly's book 'Bridge deck behaviour' a while ago and it lists out some very useful theory/equations for modelling grillages in bridge decks. I was wondering if those same equations could also be used for modelling...
Hello all,
I'm about to start work on a timber structure and - having never done timber before - am curious as to what rules of thumb one should use when doing initial sizing of timber columns. For concrete I've previously used 0.4f'c as a prelim sizing tool for axial capacity but have failed...
Hi all,
Clause 8.2.4.2.2 of the new AS3600 provides us with an option to calculate 'A_ct' if the strain at 'mid-depth' is less than zero. However, the term 'mid-depth' is never clarified in the code. Based on my cursory reading of the FIB 2010 model code - which also uses MCFT, it appears that...
Hi all,
This is something that's been at the back of my mind but I haven't really found a convincing answer so far. I understand the new shear provisions - based on MCFT - are more accurate and can bring in some potential reo savings but were there any other reasons ? Were there cases where...
Hi all,
I've noticed that in the 2018 code the 30 year shrinkage strain values for 80 and 100 MPa concrete mixes are significantly larger than those in the 2009 code. Referring to table 3.7.1.2, for th = 400 and Tropical environment, the 2018 code recommends 500 microstrains - nearly 50%...
Hi all,
This is more of an academic exercise at the moment but I'm looking into the mechanisms of loosening of fasteners under temperature actions for an upcoming project and came across a paper by Auburn University for NASA...
Hi all,
A team I'm with are conducting an FFT analysis on the results they got from an impact test on a concrete floor slab (basically they let a 5kg ball drop on the floor - no bounce). I've linked below the results they got:
Impact test...
Hi all,
I'm posting here since I believe this forum has more experience with liquid shims than the structural one. I'm working on a steel frame project (not aircraft but plant structure) where we are connecting large hollow rectangular girders with bolted connections using metal shim plates for...
Hi all,
First post here. I'm working on a project where we're constructing a large bolted steel bracing system for a building (image link for steel connection below). Due to variability, it appears that the steel shims would require significant machining at site to allow proper fit. We're...
