48366 Steel and Timber Design - Design of the Secondary Beams - Engineering Assignment Help

Assignment Task :

REQUIREMENTS OF THIS EXERCISE & DESIGN DATA 

I. Design of the secondary beams  

Determine a suitable size for the secondary beams, using UB or Welded Beam (WB) sections and Grade  300 steel. Note the following: 

? Apart from their self weight, each secondary beam carries two concentrated loads from the hopper  at a distance of ‘E’ from each end. This load is due to the hopper self weight plus its contents.  Data necessary for determination of this loading is provided in the tabulation at the end of this  document. 

? The secondary beams may be regarded as fully restrained (F) at their ends where they sit on the  primary beams. However, since it is conceivable that these beams might buckle simultaneously,  with their top flanges moving laterally in the same direction and the hopper moving with them, the  load points should not be regarded as restraint points. Hence, these beams each comprise just one  segment. In addition, a kl value of 1.4 would be appropriate in this case, in accordance with AS4100 Table 5.6.3(2). 

? The web bearing capacity of the secondary beams should be checked at the points where they sit  on the primary beams. It may be assumed that the web bearing capacity elsewhere along the  secondary beams is satisfactory. 

? Since the aesthetics of this support system is not a major issue, deflections are not an important  design consideration, but it has been decided that, under maximum loading, beam deflection should  not exceed Span length/200. 

II. Design of the Primary beams 

Determine a suitable size for the primary beams, using UB or WB sections and Grade 300 steel. Note the  following:

? A 120mm-thick reinforced concrete slab will be cast on top of the primary beams as depicted. This  slab will be ‘locked’ down onto the tops of the beams by the provision of shear connectors which  will be welded onto the tops of the beams and cast into the slabs. The shear connectors will  restrain any possible lateral buckling of the beam top flange wherever the slabs are located. 

Allow for a live loading on the slabs of 2 kN/m2. The slabs will be supported by additional  steelwork not shown on the diagram and not relevant to this exercise. 

? Assume the cross-section of the primary beams at both ends is fully (F) restrained. 

? Use the same deflection limitation as specified for the secondary beams, but only the deflection  due to the beam self weight and hopper need be considered (i.e. the additional small deflection  due to the slab loading may be neglected).  

? The shear capacity of the primary beams should be checked.  

? The web bearing capacity of the primary beams should be checked at the points where the  secondary beams bear down on them. It may be assumed that the web bearing capacity elsewhere  along the primary beams is satisfactory. 

III. Design of the columns 

Determine a suitable size for the columns. Note the following: 

? The columns may be designed as pin-ended top and bottom. 

? The existing frame is a braced structure. 

? This is to be evaluated in accordance with AS4100 Cl. 4.4.2.2. Since the column is being treated as  pinned-base, the factor cm will be 0.6 and the effective length factor ke may be taken as 1.0 

IV. Design of the connection at the right-hand end of the primary beams 

The connection of the right-hand end of each primary beam to the column of the existing building will  utilise a web side plate. For this connection, determine the number and size of bolts required (assume  Grade 8.8) and suitable dimensions for the plate. Produce a neat sketch to summarise your design of this  connection. 

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