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This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007 To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/ Steel Designers' Manual - 6th Edition (2003) 568 Worked examples The Steel Construction Institute Silwood Park, Ascot, Berks SL5 7QN Problem Subject Chapter ref. ROAD BRIDGE Design code Made by RT Sheet no. BS 5450 Checked by GWO Design the principal structure for a bridge span of 70 m, carrying a 2 lane carriageway 7.5 m wide with 2 footways 1.5 m wide. The loading is to be HA plus 37.5 units of HB. Construction depth below the road level is limited to 2.5 m maximum. Structural form: For road bridge span to depth ratio ~ 10 to 12 Try using 6.5 m depth 70 span / depth = = 10. 8 adequate 65 . Bay width say 5 m angle of diagonals = arc tan = ∞ 65 . 5 52. 4 > 50∞ adequate Cross beams to be provided at each panel point. From the limitations imposed on the construction depth below road level an underslung truss will not be appropriate. A through truss will be adopted with an unbraced compression chord to meet the unlimited headroom requirement. Restraint to the compression chord to be provided by U-frame action. A Pratt truss will be appropriate for a span of 70 m although a Warren or Howe truss could also be adopted. 19 1
This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007 To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/ Steel Designers' Manual - 6th Edition (2003) Worked examples 569 The Steel Construction Institute Silwood Park, Ascot, Berks SL5 7QN Proposed arrangement: Subject ROAD BRIDGE Design code BS 5450 - Made by RT Checked by GWO Chapter ref. 19 Sheet no. 2 1500_ 7500 l500 I Stringerc 200 slab I 100 surfacing \,/ ELEVATION Cross beams \\\\ /K// Plan bracing Cross beams 5 m C/J. - 11100 ! SECTION U-fra,ne / POSitiOfls\ N NN 14 No. bays 5 m = 70 m I I- Stringers 6500 / 6500 midspan ; mit/span
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