Composite ppt

1. ABSTRACT
•The project entails the planning, analysis, and design of an institutional
building made of steel-concrete composite materials.
•The proposed structure is a G+3 structure with 3.5m floor heights. The
building's overall plan dimension is 15m x 12m.
•The analysis and design process includes structural planning, load
calculation, 3D modelling with STAAD-Pro, and the design of a
composite slab, beam, columns, and RC foundation.

2. OBJECTIVE
•Steel consumption in the building sector in India is quite low due to lack
of expertise and construction procedures when compared to several
emerging nations.
•It is clear that composite sections made of steel encased in concrete are
now an economical, cost-effective, and time-effective option in
important civil mega projects such as bridges and high-rise buildings.

3. COMPOSITE STRUCTURES
•When a steel component is joined to a concrete component, a composite
part is generated.
•In such a composite material, the relatively strong compression strength
of the concrete balances the high tension strength of the steel.
•As each material is designed to its maximum potential, composite Steel
Concrete construction is both efficient and cost effective.
•The main appeal of such construction, however, is dependent on having
an efficient connection of the Steel to the Concrete, and it is this
connection that permits a transfer of forces and provides composite
elements their distinct behaviour.

4. SHEAR CONNECTORS
•Shear connections are critical in steel concrete construction because
they combine the compression capacity of the supported concrete slab
with the compression capacity of the supporting steel beams.
•The behaviour of composite beams under transverse stress is illustrated
in two extreme situations.
1.Full interaction - Assume that the beams are connected by an infinitely
stiff shear connection. Because the slip strain is now zero everywhere.
2.With no interaction - It was previously assumed that there is no shear
link between the beams and that they are simply stacked on top of one
another but operate independently.

5. TYPES OF SHEAR CONNECTORS
•Rigid Shear Connectors - As the name indicates, these connections are
extremely stiff and can withstand only minor deformation while resisting
shear stress.
•Flexible Shear Connectors - Flexible shear connections are made up of
headed studs, channels, or tees that are welded to the top flange of steel
beams. They get their stress resistance from bending and go through a lot
of deformation before they fail.
•Anchorage Shear Connectors - Anchorage shear connectors are used
to resist longitudinal shear and to prevent separation of the beam / girder
from the concrete slab at the interface through bond.

6. PROFILED DECK
Advantages
•Steel weight savings range from 30% to 50% as compared to non-
composite construction.
•Greater rigidity of composite beams results in shorter depths for the
same span. As a consequence, lower storage heights are appropriate,
leading in savings in classing costs, wind loading reductions, and
foundation cost savings.
•Faster rate of construction.
•It serves as a working platform and supports loads during construction.

7. PROFILED DECK
•It creates sufficient composite activity with concrete to withstand the
given loading.
•It transmits in-plane stress to vertical bracing or shear walls via
diaphragm action.
•It keeps the volume of concrete in the stress zone stable.
•It spreads shrinkage forces, preventing significant concrete cracking.

8. PROFILED DECK
Design Procedure
•Calculate the effective length of the span.
•Compute factored moments and vertical shear.
•Check moment adequacy.
•Check vertical shear adequacy.
•Check deflections.
.

9. PROJECT DISCRIPTIPON - Plan
.

10. PROJECT DISCRIPTIPON - Elevation
.

11. PROJECT DISCRIPTIPON - Loads
.

12. PROJECT DISCRIPTIPON - Loads
.

13. PROJECT DISCRIPTIPON - Analysis
.
Typical Bending Moment of a
frame at Envelope load case
Typical Shear force - Z of a
frame at Envelope load case

14. PROJECT DISCRIPTIPON - Analysis
.
Typical Shear force - Y of a
frame at Envelope load case
Typical Axial force of a frame
at Envelope load case

15. Design - Slab
.
•Basic known details
•Loads
•At construction stage
•After construction stage
•Composite condition
•Deflection check

16. Design - Beam
.
•Basic known details
•Loads
•Trial section selection and section properties
•Classification of section
•Ultimate limit state (Construction stage)
•Composite stage
•Check for vertical shear and bending moment
•Deflection check
•Design of shear connectors

17. Design - Column
.
•Basic known details
•Trial section selection and section properties considering 50% of
load
•Design Checks
1) Plastic resistance of the section
2) Effective elastic flexural stiffness of section for short term
loading
3) Non-dimensional slenderness
4) Effective elastic flexural stiffness of section for long term
loading
5) Resistance of composite column under axial compression
6) Check for second order effects
7) Resistance of composite column under uniaxial
compression and biaxial bending
8) Resistance of composite column under combined
compression and biaxial bending

18. Design - Foundation
•Basic known details
•Loads
•Plan dimensions of footing
•Calculation of pressure
•Design for shear
•Check for punching shear
•Check for bending moment

19. SUMMARY & CONCLUSION
•A G + 3 structure of plan dimensions 15m x 12m has been analysed, designed
and optimised.
•Though, the cost comparison reveals that Steel-Concrete composite design
structure is more costly, reduction in direct costs of steel-composite structure
resulting from speedy erection will make Steel- Composite structure
economically viable. Further, under earthquake considerations because of the
inherent ductility characteristics, Steel- Concrete structure will perform better
than a conventional R.C.C. structure as the stiffness is more compared to RCC.
•For analysis STAADPro software has been used. Manual design have been
carried out for steel composite building and compared with the staad model.
•Sufficient insight into the analysis and design of Steel-Concrete composite
structure which is an emerging area has been gained.
•Immense confidence has been gained in the analysis and design of a multi-
storeyed structure using STAAD Pro software which will benefit me as I step out
of the portals of the college.

20. Thank You !