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1 Composite Construction Introduction to composite construction of buildings.

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Presentation on theme: "1 Composite Construction Introduction to composite construction of buildings."— Presentation transcript:

1 1 Composite Construction Introduction to composite construction of buildings

2 2 GeneralGeneral These two materials complete one another: Steel and concrete u Concrete is efficient in compression and steel in tension u Concrete encasement restrain steel against buckling u Protection against corrosion and fire u Steel bring ductility into the structure

3 3 GeneralGeneral Aspects for using composite structures: u Architectural u Economical u Functionality u Service and Flexibility u Assembly

4 4 Aspects for using composite structures Architectural: u Longer spans u Thinner slabs u More slender column u More generous opportunities for design

5 5 Aspects for using composite structures Economical: u Reduction of height reduces the total of the building --> saving area of cladding u Longer spans with the same height --> column free rooms u Additional storeys with the same total height of building u Quicker time of erection: Ù Saving costs, earlier completion of the building Ù Lower financing costs Ù Ready for use earlier thus increasing rental income

6 6 Aspects for using composite structures Functionality: u Fire protection by using principles of reinforced concrete in which the concrete protects the steel

7 7 Aspects for using composite structures Service and building flexibility: u Adaptable structures Ù Modification during the life of the building Ù Modify services without violating the privacy of other occupants Ù Accommodation of service facilities in the ceiling within a false floor in a coffer box running along the walls

8 8 Aspects for using composite structures Assembly: u Working platforms of steel decking u Permanent shuttering u Reinforcement of profiled steel sheetings u Speed and simplicity of construction u Quality controlled products ensure greater accuracy

9 9 Construction methods Traditionally two counteracting methods of construction could be observed both connected with special advantages but also disadvantages worth mentioning. u Conventional concrete construction method u Construction in steel + freedom of form and shapes + easy to handle + thermal resistance - time-consuming shuttering - sensitive on tensile forces + high ratio between bearing capacity and weight + prefabrication + high accuracy - low fire resistance - need of higher educated personal

10 10 Construction methods u Composite Construction comparing these two methods a combination of both presents the most economic way + higher bearing capacity + higher stiffness + plastic redistribution

11 11 Construction elements

12 12 Construction elements Composite slabs u Reinforced concrete slab

13 13 Construction elements Slabs u Pre-stressed concrete slabs

14 14 Construction elements Slabs u Profile steel sheeting Interlock between steel and concrete frictional mechanical end anchorage

15 15 Construction elements Beams u Conventional and innovative composite beams

16 16 Construction elements Beams u Types of shear connectors

17 17 Construction elements Columns u Examples of composite columns

18 18 Construction elements Joints u Example of vertical shear transfer between beam and column

19 19 ExamplesExamples Millennium Tower (Vienna - Austria) u 55 storeys u Total height 202 m u Total ground floor m2 u Capital expenditure about 145 million Euro u Time of erection: 8 months

20 20 ExamplesExamples Millennium Tower (Vienna - Austria) Composite columns Concrete core Composite Slim floor beams Concrete slab 42,3 m Composite frame 42,3 m 33,05 m

21 21 ExamplesExamples Millennium Tower (Vienna - Austria) Total time of erection: 8 month max. speed 2 to 2.5 storeys per week!

22 22 ExamplesExamples Citibank Duisburg (Duisburg - Germany) u 15 storeys u Total height 72 m u Total ground floor m2

23 23 ExamplesExamples Parking deck DEZ (Innsbruck - Austria) u 4 storeys u Ground dimensions 60 x 30 m u Max. span length m with 26 cm slim floor slab (= l/40)

24 24 ExamplesExamples Parking deck DEZ (Innsbruck - Austria) Erection of composite columns over 2 storeys Assembly of prefabricated concrete slabs

25 25 ExamplesExamples Parking deck DEZ (Innsbruck - Austria) 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

26 26 Concluding summary Composite construction is popular for buildings because of following aspects: l Economy l Architecture l Functionality l Service and building flexibility l Assembly


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