GENERAL INFORMATION The attached sheet shows preliminary plans for an addition to an existing materials handling facility. A large steel hopper will be suspended from a system of beams which are supported on one side by new steel columns and on the other by existing columns which are part of an existing building. The hopper hangs from four support points on two secondary beams, which are themselves supported by two primary beams. Trucks drive underneath the hopper for loading. A tabulation at the end of this document provides data for this exercise. 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 kvalue 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. DESIGN DATA Raw cane sugar 961 kg/m Material to be held in hopper Volume of hopper (m) 56 Estimated mass of hopper when empty (tonnes) 5.0 Dimension 'A' 1.6m Dimension 'B' 2.8m Dimension C 3.2m Dimension 'D' 4.2m Dimension 'E' 1.Om Dimension 'F' 5.0m 120-thick R.C. slab B 400 mm -Secondary beam 1 -Hopper (schematic only) Primary beam 0 D Existing column -Concrete plinth. SHS column Primary Beam Existing Ebuilding F Secondary Beams Primary Beam Support points for hopper PLAN VIEW GENERAL INFORMATION The attached sheet shows preliminary plans for an addition to an existing materials handling facility. A large steel hopper will be suspended from a system of beams which are supported on one side by new steel columns and on the other by existing columns which are part of an existing building. The hopper hangs from four support points on two secondary beams, which are themselves supported by two primary beams. Trucks drive underneath the hopper for loading. A tabulation at the end of this document provides data for this exercise. 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 kvalue 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. DESIGN DATA Raw cane sugar 961 kg/m Material to be held in hopper Volume of hopper (m) 56 Estimated mass of hopper when empty (tonnes) 5.0 Dimension 'A' 1.6m Dimension 'B' 2.8m Dimension C 3.2m Dimension 'D' 4.2m Dimension 'E' 1.Om Dimension 'F' 5.0m 120-thick R.C. slab B 400 mm -Secondary beam 1 -Hopper (schematic only) Primary beam 0 D Existing column -Concrete plinth. SHS column Primary Beam Existing Ebuilding F Secondary Beams Primary Beam Support points for hopper PLAN VIEW
