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Module 1: Design of Batten Plates and Column Splices

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Video 1
Now I am going to discuss about the design of splice plate due to shear. Today’s lecture willbe the continuation of previous lecture, in previous lecture we have discussed about thedesign steps for splice plates. A splice plate may undergo due to axial compression andmoment and because of moment tension may come and also shear may come into picture. Sowe have gone through one example and we have shown that how to design the splice platedue to axial compression and moment.And we have seen that due to axial compression certain compressive force will come intosplice plate and due to bending moment also certain amount of force will come into theflange. And because of that we need to design the splice plate because of combined action.And the splice plates are designed through the connection through its flange because thebending and compressions are designed in the flange. And shear will be taken care by theweld therefore we will be design a web splice for shear.
So if we recall the earlier diagram web splice for shear we can see that it is something likethis say the columns are spliced by bolt connections, so this are the column flanges which arespliced due to complete bearing. So here we have provided a certain number of bolts to splicethem right. So this splice plate can take care the axial load as well as the moment, but theshear force will be taken by the weld, because we know the shear force is generally taken bythe web of the plate.So in case of web splice for shear we need to provide some plate here right. Now we need toknow what will be the dimension of the plate what will be the number of bolt required to jointo withstand certain shear force. So this is basically web splice for shear. So I will go throughone example and that example is nothing but the continuation of the previous example whichwe have discussed in earlier lecture. So first part I will just give a brief summary of that,means whatever we have done in earlier class we just go through that very quickly and thento just remind these dimensions and other things right and then I will design a splice plate onthe web.
Example 5.12: A column ISHB 300 @ 576.8 N/m is to support a factored axial load of 500kN, shear force of 120 kN and bending moment of 40 kNm. Design the splice plate andconnection using 4.6 grade bolts. Use steel of grade Fe 410.Solution:For steel of grade Fe 410: f u=410 MPa, f y=250 MpaFor bolts of grade 4.6: f ub=400 MPaPartial safety factors for material: (Table 5 IS 800:2007)
Video 2
Splice plates for shear:The splice plate for the shear force is provided on the web. A pair of splice plate (one on eachside of web) are provided.Let us provide 20 mm diameter bolts of grade 4.6.Strength of bolt in double shear
So we can provide a pair of 140×130×6 mm shear splice plate at each side of the web. Sonow if we draw the total diagram to see the splice plate and its weld distribution then we cansee that in front view it will be like this (as shown in the figure).
This is front view you can see this and in side view you can like this, so this is the placewhere the columns are spliced. So the column and the spliced plates are these and we areproviding total six number of bolts in each splice ok. So this is 20 mm diameter of bolt right.So in this lecture what we can see this is basically a continuation of the previous lecture inwhich we have shown how to design the column splice when the column is subjected to notonly the axial force but also bending and shear. Now if only axial forces considered then wedo not need to provide web splice on the flange. But for shear we have to provide web spliceright. So through this typical example when three types of forces are acting then how todesign the splice plate considering its connection, connection means if we consider the boltconnections how to find out the number of bolts and how the arrangements should be done,what should be the plate thickness of the splice, those has been demonstrated through thatexample. So I hope this will be made clear on the design of splice plates.