Does anyone know of a requirement for tie(fitment) spacings in lap zones in columns? AS3600 discusses tie spacings generally, and also when using high strength concrete and if columns are stock (Lu<5D), but i cant find anything on lap zones.
does anyone know of any design guidance for Edyn for use in vibration analysis? I have seen UK guidance saying it is 1.2 x Ec, and US based saying it is 1.35 x Ec. Have found nothing in AS3600 or any other Au/Nz based documents. Any ideas?
Thanks
Hi
I have a floor with a some modest cantilevers to the perimeter due to offset columns. I am getting slightly higher values of vibrations at the ends of these cantilever, i have looked a few things already such as damping, dynamic E, column stiffness etc. When reviewing the UK Concrete Centre...
i'm looking at a foundation for a round fire water tank (10m dia x 5m high) that sits on the high side of a 2m retaining wall (long story). typically, these tanks sit on a very nominal strip footing, however i dont think this is appropriate here and we are thus piling. my question is about the...
Hi All
i was hoping i could be pointed in the direction of what is the current state of using steel fibres in lieu of traditional reo for structural members such as beams, columns, piles, pilecaps. I know it is well trodden path for pavements and slabs on ground, and AS3600-2018 appears to (at...
a question on AS3600 - 11.7.3 and need to provide 2 layers of reo to walls. The cases when this is required are clear and includes when slenderness is >20. My question relates to concrete cladding panels that are not part of any structural system and are purely for cladding, such that their own...
In another recent thread a link to this presentation was linked: https://www.youtube.com/watch?v=DPew-D5RBX4&t=4247s
From about 32:00 onwards it discusses how the new NCC 2019 amends the use of AS3700-2018. A quick look at NCC-2019 and there it is under B1.4. It thus appears you can be...
Hi
Looking at CL 10.7.4.3 (b) (iii) of AS3600-2018 that is new - it appears to be adding confinement reo for 2D for very stock columns, presumeably to make sure they act in a ductile manner if overloaded?
In practice, a column in resi building would be say 250x800 with a 3m storey height, so...
Hi
When providing punching reo via torsion stirrups, AS3600-18 9.3.6(c) clearly requires a longitudinal bar in the corner of the stirrup, but gives no further comment on how to size. For torsion to be resolved it makes sense to have this bar and in the beam shear section there is clear...
Sorry for the long post, but here goes:
I am looking for some comments on how to address a concrete shear wall building with importance level 4 under seismic, and specifically the AS1170.4 and AS3600 requirement to remain serviceable for immediate use following an importance level 2 event.
I...
Hi
Looking for a sanity check. I am designing a flat slab sway frame and I cant find too much in the way of design guidance, particularly for punching shear but perhaps i am over thinking it and the normal (ie as per the AS3600) punching provisions are all that is needed?
If using the normal...
I am designing an unbraced column (within a concrete sway frame building) and have some questions about to design for FRL. Prior to release of amemndment 1 in Dec 2019, the standard did not give any recommendations for unbraced columns at all. With release of amendment 1 in Dec 2019, Annex C now...
Hi
Looking at a concrete flat slab sway frame (2 storey / 550 columns / 325 flat slab / 9m grid) and note that AS3600-2009 and 2018 Cl 5.6.2 is for braced columns only, it then refers you to Eurocode or other approaches.
Looking at Eurocode EN-1992-1-2, Methods A & B both say braced...
Hi
I am looking into this software for design of RC mid rise buildings, say up to 30 storeys. This is for use Australia to AS standards.
I expect it will not be as fully featured as others, ie ETABS for lateral design.
Any design will need to be sensibility checked and verified and I don’t...
Hi All
The latest amdt 2 has introduced a new minimum hazard design factor of 0.08 (ie min value of z=0.08). This amdt has included new map updates (fig 3.2a to Fig 3.2G) that appear to be the same as previous revision with the contours less than and including z=0.08 now deleted. The lowest...
AS3600 Cl 10.8 gives guidance on determining the effective concrete stress (f'ce)through a column / slab joint.
My question is, assuming you need the full strength of f'c in the column, does f'ce need to meet f'c or 0.75f'c as per 10.8a? My first instinct is the full f'c (or whatever is...
Hi
I wanted to get some opinions on what is the easiest / best software for purlin / girt design, i am Aus based so prefer something that uses AZ/NZS 4600. If it doesnt have Aus section properties built in i am happy to import them manually if needed.
In particular i would like something that...
Hi
I am looking at analysing a simple support beam, released axially at one end, under differential thermal loads from AS5100. The beam is for a pedestrian bridge, it is a composite 1200WB249 with a 200 slab spanning 28m.
I can derive the temperature, but i am looking for a sample calc to...
hi
I have a suspended slab that is restrained at opposite ends by shear cores & I want to determine some design forces from shrinkage to check the core design. I am comfortable in checking crack widths & reinforcing the slab, it is determining the forces on the core that I need. As the...
