Hi,
I am designing an open gantry crane for the first time though I have experience of eot cranes.I need to know the allowable deflection at top of legs under normal operating conditions i.e maximum acceleration with wind load of 25kgf/sq m.Any help in this matter would be highly appreciated.
Hi,
I was looking for proportions of web and flange for single box section in lrfd bridge spec-2007{SI edition).In 6.10.2 I could get these values for I section.In 6.11.2.2 these values for tub section are given.However proportions for box section could not be found (like ratio of compression...
Hi
I am in need of some good reference book on design of steel box girders.I specifically need the moment of inertia requirements for diaphragms
at the point of eccentric loading where torsional moment and a vertical load is applied to only one web(like from cantilever platforms attached to one...
We are in the practice of giving same groove angles(say38degrees)to both the pulleys(having different dia's) of a transmission pair.However since correct groove angle of pulley depends upon ratio of pitch dia to belt thickness,I feel the two pulleys should have different groove angles(say 38 and...
As per the byelaws of AISC the employees of a firm which is eligible for higher level of membership can not become professional members(lowest cost for engineers).I work in a public sector steel plant in india.My company is not an AISC member nor will it sponsor my membership.I am not allowed to...
A 30kw motor that was supplied along with the original 70mm
plate bending m/c has burnt out.Right now we only have a 60 kw motor as a replacement. Both are slip ring 975 rpm motors.Assuming that the factor of safety on various mechanical components like gears ,shafts etc used in the m/c is 1.5...
There are 3 columns in a plane braced frame spaced at 6 m. In order to calculate the total wind force on frame when wind is in the plane of frame,I get the force coefficient for single column(I section) as 2 . This multiplied by depth of column(500)*height(16m)give me the total force on a single...
A junction house of belt conveyors is supported in one of the planes on 3 braced columns in a plane.To calculate wind force on the structure when wind flows along this plane i also need to find udl of wind load on these columns .Columns are 16 m tall and spaced at about 6m each.I get the force...
I need to calculate total uplift on conveyor gallery due to wind load ,in order to calculate tension in bolts connecting gallery end portals to trestle top.I can calculate suction on roof from design pressure and pressure coefficients given in standards for roof.To
calculate suction at...
What is the rationale behind limiting fillet weld size as .8to .9t,where t is plate thickness?Is this also valid for T joints(double fillet)?One of the reasons that appears to me is that there is no point in making weld stronger than the plate. In addition to this,isit also(or only)related to...
What is the maximum allowable width of flange between the two webs of a box girder forordinary mild steel plates and manual welding such that the entire width can be used to calculate section properties?
What is the exact formula for minimum radius of vertical convex /concave curves in belt conveyors.Different books like rodenko/alexendrov/handbooks give differntformulae.I 've checked the design of a few conveyors in my plant and as per the formulae i have ,the radius come out to be around 250m...
A lifting tackle beam is to be designed which has 4 circular holes in the web(centers coinciding with mid point of web height)symmetrically placed with respect to mid point of beam length.Two holes will be used to suspend load through hangers connected to pins passing through the holes and two...
For the design of pyramid type plate bending m/c,what should be the optimum center distance between bottom rolls.Dias of top and botttom roll have been calculated based on the plate thickness and the load required to bend it to required radius .Any suggested references?
THE pullout torque of a motor connected to a gear box may be as high as 2.75 times full load torque.Now for static strength calculations of gear tooth, keys on shafts and shafts,which torque should be used.Gear box is occaisonally used so that fatigue life is not the consideration.
I need to design a main hoist rope drum of 100t eot crane.I can select the drum od from standards depending upon rope dia.Thickness of shell can also be calculated from rope tension and distance between webs.However i don't know how to calculate the thickness of web connecting drum shell to...
