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Composite construction or Composite Structure/Frame

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Composite structure of steel and concrete has been explained under this ppt with examples, type of structural members, advantages and comparison with other structures like R.C.C structure and Steel structures.

Veröffentlicht in: Ingenieurwesen
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Composite construction or Composite Structure/Frame

  1. 1. Presented by: Syed Abdul Rahman The Composite Construction
  2. 2. • The two complementary materials, structural steel and reinforced concrete, are introduced. • To explain the composite action of the two different materials and to show how the structural members are used, particularly in building construction. • The use of composite construction for buildings is outlined. • Its Advantages and Disadvantages are also illustrated. Objective
  3. 3. Introduction  The most important and most frequently encountered combination of construction materials is that of steel and concrete, with applications in multi-storey commercial buildings and factories, as well as in bridges.  Composite construction refers to two load-carrying structural members that are integrally connected and deflect as a single unit.  This has become a standard type of construction in high rise buildings selected by many Architects , Engineers and Developers.  Composite floor systems are considered by many to be the highest quality type of construction.
  4. 4. These essentially different materials are completely compatible and complementary to each other.  Almost the same thermal expansion;  An ideal combination of strengths with the concrete efficient in compression and the steel in tension;  Concrete also gives corrosion protection and thermal insulation to the steel at elevated temperatures.  The Indian Code of Practice for Composite Construction in Structural Steel and Concrete (IS: 11384 – 1985) Introduction...
  5. 5. The Indian Code of Practice for Composite Construction in Structural Steel and Concrete (IS: 11384 – 1985) • The maximum strain in concrete at outermost compression member is taken as 0.0035 in bending. • The total compressive force in concrete is given by and this acts at a depth of 0.42 xu, not exceeding ds. • The stress strain curve for steel section and concrete are as per IS: 456- 1978. • A stress factor is applied to convert the concrete section into steel. Fcc = 0.36 (fck) bXu a = 0.87 fy/0.36(fck)
  6. 6. Advantages Composite construction used for commercial and other multi-storey buildings, offers the following main advantages to the designer and client • The concrete acts together with the steel to create a stiffer, lighter, less expensive structure . • Speed and simplicity of construction - Faster to erect, nearly 25% faster then traditional construction. • Lighter construction than a traditional concrete building. • Less material handling at site. • Has better ductility and hence superior lateral load behavior; better earthquake resistance. • Ability to cover large column free area in buildings and longer span for bridges/flyovers.
  7. 7. • Floors • Shear Connections • Columns • Bracing Systems Anatomy of composite construction Floors = Slab + Beams Note: Mainly will discus on type of floors and connections.
  8. 8. Common Types of Floor Systems • Concrete slabs supported by open-web joists • One-way and two-way reinforced concrete slabs supported on steel beams • Concrete slab and steel beam composite floors • Composite profiled decking floors • Precast concrete floors on steel beams Note: The most common arrangement found in composite floor systems is a rolled or built-up steel beam connected to a formed steel deck and concrete slab. Mostly Profiled Decking Floors system is used in composite construction.
  9. 9. •Decking with deformed ribs (or embossed decking), as shown, is commonly used •The deformations on the ribs allow for a stronger bond between the concrete and the decking •Concrete Slab thickness must be ≥ 2” above steel deck COMPOSITE DECK SLAB
  10. 10. • Composite floor system consists of steel beams, metal decking and concrete. • They are combined in a very efficient way so that the best properties of each material can be used to optimize construction techniques
  11. 11. • Size of sheeting = 1.8mx0.830m • Thickness = 1.1mm (a min. of 0.7 mm ie recommended) • Yield strength of sheet = 250 N/sq.mm
  12. 12. • Do not need form work. • Lightweight concrete is used resulting in reduced dead weight. • Decking distributes shrinkage strains, thus prevents serious cracking. • Decking stabilizes the beam against lateral buckling, until the concrete hardens. Advantages of Profiled decking floors
  13. 13. SHEAR CONNECTOR • Mechanical connectors are used to develop the composite action between steel beams and concrete. • This connection is provided mainly to resist longitudinal shear, and is referred to as the “ shear connection“. SHEAR STUDS
  14. 14. REQUIREMENTS OF SHEAR STUDS • Shear stud diameter ≤ ¾” or ≤ 2.5 tf (prevent tear out).  (tf – thickness of flange or steel deck ) • Shear studs must extend 1½” above top of deck • They must transfer direct shear at their base. • They must create a tensile link into the concrete. • They must be economic to manufacture and fix.
  15. 15. Ribs parallel:- Longitudinal – 6 x stud diameter Transverse – 4 x stud diameter Ribs perpendicular:- 4 x stud diameter (long. And trans.) Maximum spacing 4 x slab thickness or 600mm. • Spacing of studs :
  16. 16. BEAMS Conventional and innovative composite beams
  17. 17. COLUMNS
  18. 18. Millennium Tower (Vienna - Austria) EXAMPLES OF COMPOSITE CONSTRUCTION  55 storeys  Total height 202 m  Total ground floor 38000 m2  Time of erection: 8 months
  19. 19. Composite columns Concrete core Composite Slim floor beams Concrete slab 42,3 m Composite frame Total time of erection: 8 month max. speed 2 to 2.5 storeys per week!
  20. 20. Parking deck “DEZ” (Innsbruck - Austria)  4 storeys  Ground dimensions 60 x 30 m  Max. span length 10.58 m with 26 cm slim floor slab (= l/40)
  21. 21. Erection of composite columns over 2 storeys Assembly of prefabricated concrete slabs
  22. 22. Cross section of the slim-floor beam and slab -200 mm concrete slab -60 mm prefabricated concrete elements -steel beam: web 165/20 mm flange 245/40 mm -headed studs: 22 mm 60 260 200 CONTINUE..
  23. 23. COMPARISON OF RCC, STEEL, COMPOSITE CONSTRUCTION (G+30 STORY) In the comparative study includes, • Deflections of the members, • Size and material consumption of members in composite with respect to R.C.C. and Steel sections. Project details: • Here Zone IV is taken as per IS 1893 : 2000, a typical office building plan is selected with area covering 24 m x 42 m. • Modeling was done with ETABS
  24. 24. Cost comparison bar chart for various storeys
  25. 25. CONCLUSION As the results show the Steel option is better than R.C.C. But the Composite option for high rise building is best suited among all three options. The reduction in the dead weight of the Steel framed structure is 32 % with respect to R.C.C. frame Structure and Composite framed structure is 30 % with respect to R.C.C. framed structure. Axial forces in column have been reduced by average 46% in steel structure and reduced by average 7% in Composite framed structure as compared to R.C.C. framed structure. Steel and composite structure gives more ductility to the structure as compared to the R.C.C. which is best suited under the effect of lateral forces. Total saving in the composite option as compared to the R.C.C. results in 10 % so as with Steel it will be 6-7%.
  26. 26. http://bcef.in/Download/new/Articles/Comparative%20study%20of%20RCC-Steel- Composite%20high%20rise%20building.pdf http://www.ijera.com/papers/Vol4_issue4/Version%201/BI044369376.pdf file:///F:/MINI%20PROJECT/seminar/composite%20structure%20(31-38).pdf file:///F:/MINI%20PROJECT/seminar/COMPOSITE%201.pdf http://www.steel-insdag.org/TeachingMaterial/chapter21.pdf https://www.google.co.in/?gws_rd=ssl References

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