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Dear Engineers I have been asked by a local builder to design a post to support his house. The builder had built a single-storey extension on the rear of the house and then taken all the walls out from inside the ground-floor except for a couple of partitions. To support the upper-floor, the...

The dowels are to hold the top and bottom sections of concrete together, nothing more. I got the idea from a previous thread I submitted on this learned forum. Wires were suggested to hold the skins together but we decided on pre-cut dowels as less fiddly. You seem to be ignoring the...

Dear Engineers I am wanting to check the design of a reinforced concrete-slab that has glass-block voids and a band of insulation (please see attached). The slab is constructed in two parts; with the glass-blocks laid out, the bottom rib, which contains the reinforcement, is poured first and...

Hello I am wanting to assess the strength of polystyrene and have obtained a data-sheet for the material we are going to use Attached). I am not sure why there are two compressive strengths (@1% and @10%). I suspect it may be due to the compression of the material. Can anyone educate me on...

Dear all Thanks for the advice. The slab will be poured in two stages, the bottom allowed to set before laying the polystyrene and top layer. Regards

Hello I am wanting to sandwich a dense-polystyrene-board between two skins of concrete and I am seeking an adhesive that will bond the polystyrene to the concrete. The adhesive will be subjected to some horizontal-strain but not excessively. Any pointers would be appreciated. Regards

Joe I am getting somewhere. A chap on the Autodesk form got the principles to work (attached) but I haven't had time to look into it. Change the dimensions in the palette and the array moves. The variable are stored in an ini file somewhere which may be manipulated using a script language...

Joe I want to control the block from the properties palette and then I will control the block using AutoCAD's SDK functions (C#). The block needs to be 100% programmable with no screen interaction (no grips eventually). I have a similar model that works in Revit perfectly and in 3D, gives me a...

Dear all I have drawn a parametric-block that I want a dynamic-array to follow. (attached) The array has a grip that has to manually pulled. I want this grip to go as I want to manipulate the block from a an external source. Any tips please. Regards Daniel

Joe I have been looking for a parametric model program for a while now and the best is Revit. TurboCAD say parametric in their literature as do Solidworks. All very expensive (My Revit and AutoCad cost me close to £5000 and £900 per annum subscription). Check out LibreCAD for open source...

Solved I had my x, y and z's mixed up. Perfect result.

Dear FlashSet Thanks for the links. I have put together, what I hoped, is a simply supported beam with a UDL of 1kN/m. (attached). I ran Frame3dd and got a result but its wrong but a result all the same. If you are familiar with Frame3dd, would you look at my input file to see if my mistakes...

Hello I have downloaded frame3dd and openGL and I want to use it. Any clues please. The technical help is not much good but I 'kind of' understand the templates and examples that came with the download. I just need someone to steer me in the right direction. All tips and examples greatly...

Hello I am wanting to calculate the deflection in a manhole-cover I am drawing (attached). The concrete is effectively a reinforced-slab with the reinforcement welded to the steel-frame. The frame is 5mm thick (or more depending on my calculations). How should I calculate the deflection...

When I was a student, I attended a lecture on three-dimensional stress analysis on a slab. The lecturer gave the proof for three equations solving the indeterminate structure. Most of the math was above me at the time but I did recognise that the equations were very similar to Macaulay-theorems...

Dear all Great links. I have been 'reading-up' on the behaviour of small thin-slabs under various load conditions for over a year and I think I am slowly getting 'there'. What I found surprising, given the number of enquiries there are for moments on slabs - UDL, concentrated, etc. - there...

Dear all I have spoken to the engineer that provided the revised equations 10 and 11. Chris (the engineer) worked out the equivalent-UDL for the concentrated-load and supplemented the equivalent-UDL into equations 10 and 11. I have not done the check but the solution is very elegant. Any load...

Thanks for the response. The slab is simply-supported and allowed to lift at edges. The spans are not equal ranging from 1:1 to 1:4. I am designing a slab 1500:1900mm (1:1.3) but I want to be flexible and cover all ratios, hence a formula. I have looked at Roarke and the situation I am...

Hello I am trying to find a formula that I could use in a spreadsheet for the bending-moments of a simply-supported two-way slab under a concentrated-load (similar to equations 10 and 12 of BS8110). The load is 300-mm square. Any references or guidance would be appreciated. Regards

I misread the clause and i have solved my problem. regards