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dhengr: I'm aware that the problem as described here, is not very well posed. But i'm afraid i can't provide any more information on an open forum like this. What I'm looking for is really some knowledge about how "Hog & Sag" is generally taken into account. Perhaps some users have knowledge of...

There seems to be a problem with the Figures. Please see them on the below links: Rack on deck: Link Hog and sag: Link http://files.engineering.com/getfile.aspx?folder=ee5f9737-0e8f-4335-b829-cc206cb36408&file=Rack_on_Deck.PNG

Dear Engineers I'm working on a rack used for sea transport of some long objects. The objects are stacked in the rack. Please see attached figures. I'm worried about the influence of hog & sag effects on the rack. Due to this effect, i think i need a longitudinal degree of freedom between the...

I do not have experience with that kind of load situation myself. However, if i had this problem i would probably use software to solve it. I imagine you could model it as a truss system in e.g. a FEA software, if you have that available. As you said yourself, handcalculation will probably be...

Dear engineers I am working on a concept and cannot give too many details. Basically its for lifting something up in a windturbine. See left side of IMAGE During the lift, wind forces may push the lifted object into the tower. I wish to find the impact force to see if the tower takes damage...

Hi Mark Depending on what code you follow, you might just distribute the load in 4, and the apply some additional safety factor. E.g. according to this...

I would maybe give it more consideration if i was designing for dynamic loading and fatigue, but right now it is just a static load and the structure is only to be used a 'few' times (few as in relative to fatigue). And for this i think my assumptions are reasonable. However this is just my own...

Thank you for your answers Would it be reasonable to find the shear stress as if half the threads are carrying the load? My reasoning is that some (allowable) yielding will occur which will help distribute the load + the tapped hole length is only ~1.4*D I am aware of theory that says that...

Hi desertfox, thanks for helping out. My problem with these thread stress calculations is basically the assumption of: "When the female and male threads are the same material." I am connecting a material with ultimate strength of 310 MPa using a bolt with ultimate strength of 1000 MPa. Of...

Hi eng-tip readers I have a large casted steel structure. I will be using high strength machine screws to attach another steel structure onto this casted structure. Since it is not possible to use nuts, and hence the threads in the casted structure must carry all the bolt load, i am a bit...

Ah, i'm being stupid. I see it now. Thank u :)

Ah, i'm being stupid. I see it now. Thank u :)

Where is that expression from? Wouldnt you need to integrate stress over thickness?

Hi Mike, thanks for helping out roymech seems like a great ressource. About the loads. Let me just draw another figure - the plate seem from the side. http://imgur.com/vKp6BBv Say i find the max edge bending stress from the Roark table you pointed out. How can i then justify that this stress...

Dear fellow engineers Take a look at this picture: http://i.imgur.com/vObP2HB.png Description: We have an open 'box' and we weld a plate to the inside of the box, using fillet welds on all edges on both sides. Plate is light blue, and the dashed lines is the plate if the sides of the box was...

Seems like an excellent reference ul92, thank you.

Thank you for pointing those things out rb1957. Right now i find the components from the moment as Rx = M*y/I_p and Ry = M*x/I_p. With regards to optimising bolt placement and size, i cannot change these parameters unfortunately. And you're spot on, on the perfect placement requirement. This...

So if i understand you correctly TLHS, you'd say that (denoting the load P, length between the two bolt connections L, and distance between bolts d): vertical shear on each bolt: V_vert=P/8 and approximating moment in each of the two connections: M=PL/8 which gives horizontal forces...

Thank you paddingtongreen. And sorry for asking my question in a bad way. I think the keywords i needed to hear was yielding and thereby load redistribution. The reason i haven't provided much detail about the problem, is that the design is really still up for discussion. However i know i'll...

I'm not sure i quite understand your points on friction rb1957. I agree that it can be difficult to calculate precisely how much friction you have - but as in most other complicated situations that just mean you choose your unknowns conservatively - i.e. a low coefficient of friction. However...