Can anyone out there please help me?
For ages now I've been looking for simple formulas for calculating Mmax for simple beams with more than 2 point loads, for example multiple beams on girders. Text books etc only ever seem to list formulas for 2 loads.
What if I have 5, 6, 7 etc?
I did find...
Something I've pondered for a long time:
Why don't the DNV rules (2.7-1) check for "tensile tear-out" and only "shear tear-out"? As I understand there are a number of failure modes of a lug, bolted connection etc. Typically the 3 checked are shear, tensile and bearing.
The allowable stress...
Are there any rules of thumb when it comes to fillet welding plates of different thicknesses?
I require the minimum thickness of plate to weld a lifting lug to. The lug is to be 16 mm grade 250 plate. The obvious solution would be to use 16 mm under it as well, but is that necessary, or...
Hoping someone can help me out here. See attached loading for a simple fork jib.
With the steel section having a section modulus of 430 E3 mm^3 and 98.1 kN at free end I calculated Mmax = 276.6 E6 kNm and bending stress fb = 643.2 Mpa. Too high I realise and have since beefed the section up...
AS1657 says "unless otherwise approved by the regulatory authority, the head clearance shall be not less than 2000 mm measured vertically from the nosing of the tread."
I have a specific application requiring a stairway/landing at 1500 mm high. Does that mean I cannot design and build it?
To...
We are currently building a number of beams that are then obviously proof load tested.
My boss insists on having the lug welds UT (Ultrasonic Tested) prior to proof load test, then MPI (Magnetic Particle Tested) after proof load test.
Other than as a health and safety concern I do not see the...
Good day folks,
I have a question I am hoping someone can help me with. The attached file shows an isometric of a clevis assembly we are building.
It will have a sideways load of 50 Tonne on it (shear on weld).
I would like to know how to do a weld check on the bottom pin - 90 mm diameter. I...
AS4991 (Australian Standard) Lifting devices states that:
Where a lifting device is being used for general application, it shall be capable of withstanding -
a) a minimum design load of 1.5 times the capacity.
But then states:
Lifting devices shall be proof loaded in accordance with the...
Good day,
I am doing some calculations on a rectangular tank we are to build. Product has a SG of 1.0, worst case 1.5. Tank has a capacity of approximately 330 barrels, so 52 Tonne.
Can someone please tell me the loading I should assume for the side walls of the tank, evenly distributed...
In normal circumstances we specify a Complete Penetration Butt Weld with this type of thing, but I am investigating in another instance simply specifying a 6 or 8 mm fillet weld instead.
I have attached a computation of the scenario. Could someone please take a look at it and offer me any...
Our Australian Standard AS1657 "Fixed platforms, walkways, stairways and ladders" stipulates some pretty strict rules for tread spacings (I am sure most worldwide do).
ie.
"All rises and goings in same flight of stairs shall be of uniform dimension +-5mm.
Each rise shall not be less than 150...
Attached is a loading diagram that I have come across for a test gantry we are building.
I have not come across such an abnormal loading set-up before, and cannot find any literature that addresses my problem ie. shear and bending moment diagrams and Max shear and bending moment.
Can somebody...
I thought some time ago I saw a table showing allowable load per mm in an Australian Standard. Not sure if it was AS3990, AS4100 or another. Can someone please tell me if they have seen it, and which standard it is in?
Regards.
Good afternoon folks,
I am currently attempting to calculate the shear centre and shear flows in a "built-up" asymmetrical section we are using in a particular fabrication. I have not done this type of thing for quite some time and am finding it quite difficult to find any worked examples using...
Good morning,
I would like to know the correct way to calculate the maximum load a complete penetration butt weld can take.
The weld is on a 25 thick cap plate welded to the end of a piece of 150x150x9 square hollow section.
On top of the cap plate is a lifting lug.
The plate, lug, and steel...
