Im unsure this thread is in the correct place, so apologies if its not.
We shall be designing the thrust restraint (DeadMan) for a Horizontal Directional Drill (350Ton Rig). I have limited information regarding the forces involved and was looking to see if there was anyone that could offer...
Gents,
I was just wondering your opinions/any good refrence material you know of on the friction co-efficients of some of the following:
Steel - PTFE
Steel - Concrete (Wet or underground)
Steel - Conrrete (dry)
I have had a look around the net and found a few bits but nothing conclusive...
Does anyone know what the OBRDS acronym (possibly) stands for?
It refers to Ground Fixings for an acoustic surround for a generator? I have contacted the supplier and they are none the wiser. Please see attached.
Thanks in advance!
PST
I dont have the 11th edition but from what i hear they have cut a few things out of it and its not as involved at the 10th edition?...might just their personal view though!
from the way the question reads it seems like the contractor is asking for the location of the fixing points for the crane thats located on the SSK? Thats what the term crane on the SSK implies to me, so maybe its an abreviation for some sort of structure or maybe its the way im interperating...
There is a book called 'Modern Timber Engineering' which includes some refrences to the Lamella Roof structure.
http://books.google.co.uk/books?id=Y6lRAAAAMAAJ&q=lamella+roof&dq=lamella+roof&ei=9XZkSrSZNpTklATC-_3BDg
Unforfunatly i dont have a copy hanging around but someone else might.
If...
I assume you mean a set of 'floating' stairs where each step is fixed at one end like this:?
http://www.marrettistairs.com/staircase/hanging-staircases/metal-steel/fs/sm013.jpg
http://www.mydiscounttools.com/estore/articles/conversions.html#hard
Some good conversion tables on there
Grade Tensile and Yield Strengths
Metric English Tensile Strength Min. Yield Strength Min. Yield Strength
Value Value...
Asbestos is nasty stuff. It sounds like your essentially covering up the problem with fill.
I'm assuming you’re going to have a substantial depth of fill but it can still leach into watercourses etc and have massive environmental impacts. Do you have control measures in place for this event...
If its a british beam and standard i may be able to help.... AISC has Design Guide 15, which is a reference for historic shapes and specifications. This guide includes information on many shapes that predated the AISC manuals.
This seems to be a free search engine for section properties...
Thinking about the problem I would tend to agree with your hypothesis that there may be additional moments that you have not modelled.
Would having a slightly unsymmetrical strut not mean that the beam properties (I, R, Z etc) would be slightly different for unsymmetrical struts? Your 2d...
In in the UK so it does not really help! I was just trying to feed the thirst for knoledge and interested the the design method used and how it differs to the way we whould do things over here!!
eelssm ... bit off topic but i would be interested in seeing your design steps because i have to design one of these shortly. Did you design by hand or do you have any good refrences?
http://www.engineershandbook.com/Tables/frictioncoefficients.htm
This table might help, it allows you to compare two materials. I dont think you will be able to get an exact coefficient for the specific materials that you have mentioned other than by testing the two materials...
Concrete grade and rebar grade depends on ground conditions and/or environment that the structure will be in. What sort of 'scheme' is it? Consult local codes with reference to building standards/structural use of concrete & steel (again dependent on the type of structure you’re designing)...
initially I would design ignoring permability. If the material fails then i would look at the problem and try to condider the permability issue but as dgkhan said there may not be a 70% reduction in loading becaue of the permability.
