Foot bridge presentation


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Foot bridge presentation

  1. 1. Structural design-II Prepared by: Kauswala Tausif k
  2. 2. Structural Design-II syllabus •RCC DESIGN •STEEL DESIGN
  3. 3. RCC DESIGN • Loading standards as per I.S & guidelines for the preparation of structural layout. • Analysis, design & detailing of G+3 RC framed building for residential & commercial Purpose with ductile detailing. • Design & detailing of underground and elevated water tanks of different c/s. • Design & detailing of cantilever & counter fort retaining wall
  4. 4. STEEL DESIGN • Design of bolted / welded plate girder for static and rolling loads. • Structural layout & Designing of every components of industrial building. • Design of foot over bridge and structural system of through and deck bridge. • Design principles for tall steel structures like transmission towers, chimney etc
  5. 5. Topics covered by ME • Full Steel design –all chapters • RCC design - Analysis, design & detailing of G+3 RC framed building for residential & commercial Purpose with ductile detailing.
  6. 6. Theories based on foot over bridge
  7. 7. Topics • When to use truss girders..? • Difference between Plate girder and Truss girders. • Types of Truss girders • Components of Truss girder. • Loads on Truss girder • Applications of Foot over Bridge
  8. 8. When to use..?? • To carry main load • When load is so large that can not be economically bridged using plate girders • If span is comparatively large.
  9. 9. Difference Plate girder Truss Bridge • Continuous web • Not continuous – open web having • Smaller spans up to vertical and inclined 15-24 members. • Elevation is not • Spans upto 30 and good. more. • More cost • Elevation is good. • Less cost
  10. 10. Types of truss girders • Through type • Deck type • Semi type/half through
  11. 11. Deck type Bridge
  12. 12. The carriageway rests on the top of the main load carrying members. In the deck type plate girder bridge, the roadway or railway is placed on the top flanges as shown and the cross girders are supported by the trusses generally at the panel points
  13. 13. Through type truss • - The carriageway rests at the bottom level of the main load carrying members. In the through type plate girder bridge, the roadway or railway is placed at the level of bottom flanges. The bracing of the top flange or lateral support of the top chord under compression is also required.
  14. 14. Semi through type bridge The deck lies in between the top and the bottom of the main load carrying members. The bracing of the top flange or top chord under compression is not done and part of the load carrying system project above the floor level The lateral restraint in the system is obtained usually by the U-frame action of the verticals and cross beam acting together.
  15. 15. Components of Truss girder bridges
  16. 16. The weight of the truck (and bridge deck) is carried by the stringers into the floor beam and then the floor beam carries this load to the truss at the node point (joint). The bottom chord of the truss is not bent by the weight of the truck because the stringer is attached to the floor beam and not the truss chord.
  17. 17. Loads Applicable on truss girder
  18. 18. The following are the various loads to be considered for the purpose of computing stresses, wherever they are applicable. Dead load Live load Impact load Longitudinal force Thermal force Wind load Seismic load Racking force Forces due to curvature. Forces on parapets Frictional resistance of expansion bearings Erection forces
  19. 19. Applications of Foot bridge At railway station to change the platforms
  20. 20. Sky walk in metro cities
  21. 21. Connecting two building towers
  22. 22. Busy Streets to cross the roads