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Thank you all for your advice. Am i being naive to think that the connection of the diapragm to the beam webs is simply shear only? I think technically if i want one beam to adopt half the load from the other the diaphrgam must act like a cantiliver with moment connections at each end which...

Hi I have a pair of steel beams (twin beams) running parallel to one another. supporting the same 440mm thick brick wall over. One beam of the pair is however supporting a separate perpendicular steel beam creating a large point load. I want both beams to work together and therefore rely on a...

Hello, Basic few questions. scenario = basement box comprising of rc raft, RC retaining wall all the way round, ground floor flat slab. superstructure over with concrete core that spans from basement to top floor). 1. can a RC retaining wall that spans the entire perimeter of a basement with...

WARose, Thanks for the reply i have since forwarded my concern to my manager. JS

Dear All, I have posted something similar previously. Currently modelling a 12 no pile cap supporting a concrete core, piles will be terminated in stiff clay. As we know in order to design the full extent of the rebar top and bottom for the pile cap and understand a more realistic distribution...

Dear All, Designing a RC piled Raft. medium dense clay of approximately 100kn/m2 CU value. Just want some friendly advice. 2 options as i see it 1. model the raft as a slab supported on a continuous set of springs. The K value (modulus of subgrade reaction) is required? No plate bearing test...

Hi Everyone. I am currently developing my knowledge in geotechnical design of CFA piling. I understand the basic principles for developing shaft resistance and end bearing to create an unfactored compression resistance. However, as with the majority of basement projects Piled walls for...

Dik, Thanks for the reply. I have since posted this thread in the correct forum. My mistake... 1. Sorry, are you saying that once concrete has hardened both directions of steel work can be regarded as restrained? 2. Yes you are correct. However my employer has asked for the structure to be...

Dear All. 5 storey steel frame building (residential). Steel beam with steel/concrete deck flooring kingspan or something. 1. is it sufficient to assume that if the decking trays are positioned and cut correctly, so as to ensure a trough of the deck lies on the top flange, can beams running...

Dear All. 5 storey steel frame building (residential). Steel beam with steel/concrete deck flooring kingspan or something. 1. is it sufficient to assume that if the decking trays are positioned and cut correctly, so as to ensure a trough of the deck lies on the top flange, can beams running...

Dear All, Could someone please provide me with some advise on studyng pile group design (specifically CFA). I have Craigs mechanics, foundation design and construction (tomlinson) and Pile Design and construction practice Tomlinson/woodward,. Is there any further reading i should take on board...

Dear All, Could someone please kindly provide me with a step by step process on how to attain the uplift pressure from a clay based subgrade on a single basement Raft and the general design procedure for such a structure? Please note this is purely educational as i am soon to be using this...

Hi guys, For those who are not familiar, the current Eurocode, as far as i am aware, does not provide advice on wind load zones for top floors with inset storeys, such as the whole penthouse theme with terraces etc. Does anyone know the current criteria for calculating the wind pressures in...

Thanks guys, The concrete retaining structure does support additional columns loads from above, so concentrated loads are applied but then distributed down the walls. In any case and for construction simplicity we are going to allow for simply supported single span ground beams supported on...

BA Thanks. So we are expecting RC concrete ground beam with CFA RC piles, therefore i should model the beams as a simply supported continuous member( treating the beams as suspended)? Just out of curiosity in what scenario should i be considering pile/subgrade stiffness/modulus? Thanks.

see attached for the other sketch.http://files.engineering.com/getfile.aspx?folder=9bac6b91-dcbb-4d53-a894-d9a3e9470a63&file=PLAN_VIEW.pdf

Hi Guys, I have a few questions regarding foundation design for a basement support structure. Please, first review the attached to familiarise yourself with the geometry/scope of my questions. The scheme, at this point is to create a basement retaining wall box structure with slab over and...

Thank you all for your comments. especially KootK. I will review the attached material and try my best to get hold of some of the CRSI material if feasible. Though working in imperial measures kills me... Cheers guys!

Hi guys, I am a 1 year grad structural engineer. Getting my head around the differences of beam and truss analogy in Pile Cap design. my question is regarding the difference in rebar arrangement for 3 group pile caps designed under beam theory and strut and tie theory. Traditionally as far as...