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Associative dimensions in paperspace must have their nodes anchored on a point over the object being dimensioned. In other words, you can dimension to endpoints, centres etc and the dimensions usually keep their place. However you cannot use coordinate filters (.x of and .y of etc) if the...

I cannot recall seeing circumferential reinforcing in a slab like this, but it is possibly a good idea as the orthogonal reinforcing is not always well cut and fitted to the circular shape of the hole. I have seen diagonal (to the main orthogonal reinforcing) bars used around a circular hole...

The stiffness will be dependant on the distance along the column web from the welded edge of the beam flange to the root fillet of the column flange. This area of the column web may also be subject to some severe stresses and should be checked if your beam loads change frequently. If the beam...

I think that a high tensile capscrew like Gr 10.9 should never be used with any kind of spring washer or lock washer as the loads are too high. Use correct preload (part-turn method rather than torque) and perhaps hardened steel flat washers under the heads.

As a first step, look in your local concrete design code. It will probably give you a method to calculate shear around a concentrated load, or the shear around a column to slab connection, which is a similar thing but inverted. For bending moments, try the yield-line (also called Johansson's)...

In most places, the correct metric abbreviation for millimetre is mm (in lower case). This is important. For example Mm is the abbreviation for megametre (10E6 metres). In your first post, Toolmantwo, you mentioned dividing your centimetre scale into half centimetres (5mm) and then into...

JAE A most interesting topic. I agree with your views. Here in South Africa the calcs are seldom asked for or reviewed by the building control authorities. However peer review (inside or outside one's organisation is not uncommon). I agree with RASmith that if calcs are submitted for review...

If you draw a diagram of the forces involved, the structure face is pushing against the jam nut (installed first), and the heavy nut (installed second) is pushing against the jam nut from the other side. The net reaction force between the jam nut and the bolt threads may be quite low, depending...

I have the following experience Structural steel model where .dwg file size is 15 to 20 MB. Shaded not rendered, rotated using orbit. Acad 2002, WIn 2000, 1GHz Athlon, 256 MB RAM, Nvidia GForce 2mx 64 MB graphics. Initial response time less than 0.5 sec when orbiting. Slows down after the...

It sounds as though you need to sit at a table with a structural engineer who does concrete. There may be all sorts of unusual issues here. It is difficult to picture what you are doing.

Maybe this is a stupid question, but have you actually measured the loss of conductivity in the tyres as a result of the oil-soaking? A simple ohm-meter with the forklift tyre standing on a metal plate would give answers. Maybe you are not losing much conductivity.

I am not a mech engineer, but I think you should consult the bearing manufacturer to find out what they would consider acceptable. It is probably dependant on the thickness of the outer bearing shell.

If you are using AutoCAD 2002 and above, you can use 'Page Setups'. Set up the plotter you want to use in a blank drawing (or in your template drawing) and save as a setup drawing. Then you import the setup from this drawing into your current drawing, for each current drawing. Once imported...

Dustybottoms The problem you describe is a known problem in AutoCAD 2002 when the viewport has been set to parallel projection. The problem may also occur when the viewport display mode is set to something other than 'wireframe'. Note that display mode of 'wireframe' still allows the viewport...

Or you can switch off the layer on which the viewport was created. Do not freeze it or you may get odd things when you hide for plotting.

I have not seen the AASHTO code, but I suggest that you cannot just check your calculated stresses against simple allowable stresses. The governing stress conditions in a bridge structure like this include things like out-of-plane buckling of the plate elements, crippling stresses at load...

It would seem to be the case, after reading the pool experts comments on what causes 'concrete to rot'. If you want expert advice on concrete durability and newly developed testing methods, you could contact Prof Mark Alexander (mark@eng.uct.ac.za) at University of Cape Town.

Presumably you are getting to model space through a viewport in paper space. Check that the system variable UCSFOLLOW (type this name on the command line) is set to 1 inside the viewport.

Concrete columns of L and T section are not normally covered in detail in codes of practice. You need to use fundamental principles of section analysis, strain equations etc. Specialised software is the easiest solution if you have access to it. There are many software solutions from various...

I have not heard of Dry Cast Concrete, unless the term refers to the mix that is used for making 'cement bricks' also known as 'concrete masonary units' or 'concrete blocks'. The mix used for these is not dry. It contains enough moisture for a sort of fruit cake consistency so that the blocks...