Recent content by hannis

Hi All, I'm looking for help on the required connection between circular driven piles and the precast concrete pile caps that will sit on them. The structure is for a marine jetty taking mooring loads so the connection will need to resist shear loads and uplift. Would I treat it the same as a...

In the UK there is a publication by CIRIA (Construction Industry Research & Information Association) The Design of Deep Beams in RC ( by Arup, 1977) it is a useful guide if you could get hold of it since it deals with storey height walls as beams in bending and shear.

Agreed, serviceability often limits, since we do not want a structure or component to deflect causing cracks and elastic deformation etc. Hannis

Hi Kfro, I've not used ANSYS, but generally non-linear effects would mean the behaviour of the material beyond the elastic (linear)limit, either in the elastic/plastic region where permanent strains are setup e.g as in proof stress. Or even further in to the plastic region where plastic...

All, Many thanks for your valued responses and I would agree with the general sentiment that non-linear analysis is perhaps best suited to either accidental loading, blast loading or to the validation of an existing structure for an increase in floor loading. There are situations when one does...

My apologies if I was not clear, this has come about from a review of a non-linear design of concrete floor slabs within a multi-storey building. Basically the concept of non-linear design of concrete makes me concerned and as you correctly point out the slab has cracked and is yielding...

Hi, The use of Non-linear FEA for the design of concrete building structures would appear to be more common. My experience is very much in the use of Linear FEA models and in this respect when dealing with reinforced concrete appears a safer approach. I would be grateful for any opinions by...

I've designed numerous tanks for treatment works and clean water etc in the UK and wherever possible have tried to avoid using water bars. They're never installed correctly or very rarely and don't always perform as their suppose too as claimed. If you need joints allow the contractor to...

Thanks herewegothen, your correct about the very conservative results than pinned restraints return for piles, hence the reason to check once I've got pile data. The usual case is that the contractor needs to know a pile load before he can get his pile designer to work something out. So it is a...

Hi All, Just a general query in respect of springs used to model piles for a raft slab. For initial results I tend to use pinned restraints to model piles simply to get an idea of what the likely pile loads will be; but once detailed site investigation information and/or a pile design...

All, I'm currently reviewing structural drawings for a code compliance check and the RC details indicate a 'Shear Key' at the interfaces between floor slabs, walls and columns etc. I understand that this is a standard way of detailing concrete pour breaks by North American practice. And for...

Lutein/AUCE98 Thanks very much, the advice and tips are helpful. Regards Colin

I'm currently carrying out a code compliance check of a multistorey building that has 9" PT floor slabs. Unfortunately I only have an academic understanding of PT slabs. Are there practical issues in terms of the drawing design details etc that I should be aware of. I have already read with...

bjb, My own experience in the UK is not to use accelerators unless there is a programme need or a structural reason to attain early strength either way they are not a good means of controlling the rate of hydration. Having a good curing regime(often ignored by engineers and contractors) is the...

Hi, I understand that ACI 515.1R-79 Clause 2.5.5 lists materials/chemicals that attack concrete. Unfortunately here in the UK (I could be wrong)there does not appear to be a list of such chemicals in any of our technical standards or publications. Would anyone have an abstract of this list...