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DEPARTMENT OF CIVIL ENGINEERING VALLIAMMAI ENGINEERING COLLEGE

Prepared By; Mr.J. Arunraj christadoss, Ap/civil

VALLIAMMAI ENGINEERING COLLEGE KATTANKULATHUR

ST7013-DESIGN OF STEEL CONCRETE

COMPOSITE STRUCTURES

( As per Anna university regulation 2013)

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DEPARTMENT OF CIVIL ENGINEERING VALLIAMMAI ENGINEERING COLLEGE

Prepared By; Mr.J. Arunraj christadoss, Ap/civil

VALLIAMMAI ENGINEERING COLLEGE

DEPARTMENT OF CIVIL ENGINEERING ST7013-DESIGN OF STEEL CONCRETE

COMPOSITE STRUCTURES

SEMESTER: 03 rd REGULATION-2013 YEAR: M.E/II

UNIT I

INTRODUCTION

Introduction to steel - concrete composite construction – Coes – Composite action – Serviceability and - Construction issues.

PART-A

1. Describe the term composite behavior of steel concrete member. BT-1

2. Describe transformed sections. BT-1

3. Write about slip strain. BT-1

4. Show the graphical representation of the interaction between the moments in the design of continuous beams.

BT-3

5. List the various limit states in limit state approach. BT-1

6. Write about sectional classification. BT-2

7. Show the stress and strain diagrams for a non-composite steel concrete beams. BT-3

8. Write any one application of steel concrete steel sandwich construction. BT-1

9. Outline any two role of profiled metal decking. BT-2

10. Outline the advantages of steel concrete composite construction. BT-2

11. Show the curves for slip strain and slip. BT-3

12. Explain the role of steel decking in composite deck slab. BT-2

13. Explain the composite beam stage. BT-2

14. Investigate the composite slab stage. BT-4

15. Identify the failure modes of composite beams. BT-4

16. Investigate the principal advantages of composite construction for civil engineering structures.

BT-4

17. Prioritize shored and unshared methods of construction. BT-5

18. Assess the essential difference between RCC and steel concrete composite structures.

BT-5

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DEPARTMENT OF CIVIL ENGINEERING VALLIAMMAI ENGINEERING COLLEGE

Prepared By; Mr.J. Arunraj christadoss, Ap/civil

19. Compose.

a) Modular ratio b) Transformed section BT-6

20. Invent the composite action between steel and concrete is ensured. BT-6

PART-B

1. Describe NO INTERACTION case with FULL INTERACTION case. BT-1

2. i) Explain with neat sketches the various types of steel concrete composite members.

ii) Discuss the proportioning of composite members?

BT-2

3. Discuss about the determination of ultimate moment capacity of a composite section with profile sheeting.

BT-2

4. Investigate in detail the construction and maintenance issues of composite steel concrete structures

BT-4

5. a)Describe steel concrete composite structure b) Write the advantages of steel concrete composite connection

BT-1

6. Examine a simple supported composite beam with 8m span spaced at 3m c/c. thickness of slab = 100mm. The floor has to carry an imposed load of 2kN/m2, a construction load of 0.75kN/m2and a floor finish load of 0.5kN/m2. Floor will not be propped during Construction. Show the adequacy of section at construction stage and composite stage. Solve for deflection and stresses. Use M30 grade concrete.

BT-3

7. A composite floor slab is supported on three span continuous composite beams spaced at 4m c/c. The effective length of each span is 7.5m. Thickness of composite slab is 150mm. The floor has to carry an imposed load of 4kN/m2

and dead load of 1.5kN/m2. .Outline the design of the continuous beam. Use M30 grade concrete

BT-2

8. a) Explain the composite beam stage and composite slab stage. b) Explain the role of steel decking in composite deck slab.

BT-4

9. A two span continuous beam composite beam with 6m span each and are spaced at distance of about 3m.The thickness of slab is 125mm.The floor has to carry an imposed load of 2.5kN/m2 partial load1.5 kN/m2 and floor finish load of 0.75 kN/m2.Assume the construction load as 1kN/m2. Use M30 concrete and yield stress of steel 250 N/mm2. Write the design of the continuous beam.

BT-1

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DEPARTMENT OF CIVIL ENGINEERING VALLIAMMAI ENGINEERING COLLEGE

Prepared By; Mr.J. Arunraj christadoss, Ap/civil

10. Illustrate the behavior of steel and concrete under uni axial stress and also examine the behavior of composite material.

BT-3

11. Assess the failure mode of the steel concrete sandwich elements BT-5

12. a) Invent about transformed section?b) Compose the determination of ultimate moment capacity of a composite section

BT-6

PART-C

1. Describe the various construction issues of composite sections. BT-1

2. Explain the various serviceability issues of composite sections. BT-4

3. Investigate the behavior of composite sections. BT-4

4. Discuss the case study on composite sections. BT-2

UNIT 2

DESIGN OF CONNECTIONS

Shear connectors – Types – Design of connections in composite structures – Degree of shear Connection – Partial shear interaction

PART -A

1. List the main functions of shear connectors. BT-1

2. Predict the load transfer taken place in fixed shear connections. BT-2

3. Describe effective flexural stiffness. BT-1

4. List the different types of shear connectors. BT-1

5. Write the empirical formula for design resistance of shear studs. BT-1

6. Show the load slip curve. BT-3

7. Write the assumptions made for the analysis of ultimate moment capacity of the section.

BT-1

8. Discuss partial shear connection. BT-2

9. List the functions of connectors. BT-1

10. Discuss full shear connection. BT-2

11. Predict the moment of resistance of the composite steel concrete section as per IS 11384-1985

BT-2

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DEPARTMENT OF CIVIL ENGINEERING VALLIAMMAI ENGINEERING COLLEGE

Prepared By; Mr.J. Arunraj christadoss, Ap/civil

12. Examine the purpose of shear connectors. BT-3

13. Outline the load bearing mechanism of shear connectors. BT-3

14. Examine the principle of design of shear connectors. BT-4

15. Compare flexible and rigid type shear connectors. BT-4

16. Compare vertical and longitudinal shear. BT-4

17. Assess the limiting stud diameter required for a composite construction. BT-5

18. Assess the shear lag effect. BT-5

19. Invent the maximum spacing of shear studs in SCS sandwich construction. BT-6

20. Compose strength of connectors. BT-6

PART-B

1. i) Discuss the load carrying mechanisms of shear connectors. ii)Discuss in detail about the various types of shear connections along with the need sketch

BT-2

2. i) Describe the load carrying behavior of the stud connector. ii) Write how shear connecters are designed.

ii) Describe about the push out test.

BT-1

3. A composite beam of 8 m span is spaced at 3m c/thickness of RC slab is 125 mm. The floor has to carry an imposed load of 3 kN/m2, partition load of 1.5 kN/m2 and a floor finish load of 0.5 kN/m2. The floor will not be propped during construction. Find the adequacy of the section at preconstruction stage and also describe the design of shear connection.

BT-1

4. i) Investigate about shear connectors and explain its types with neat sketches. ii) Explain the characteristic strength of shear connectors.

BT-4

5. a) Outline the step by step procedure of connection in composite structures. b) Discuss partial shear connection.

BT-2

6. a) Write about shear connectors. b) List different types of shear connections.

BT-1

7. Explain beam and column connections in composite structures. BT-2

8. Examine the design of the shear connection at the interface of a composite RC BT-3

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DEPARTMENT OF CIVIL ENGINEERING VALLIAMMAI ENGINEERING COLLEGE

Prepared By; Mr.J. Arunraj christadoss, Ap/civil

slab and steel beam for the following data: Span of the beam =9m Spacing

of the beam = 3m Thickness of

slab= 100mm Steel beam

section = ISHB 400

Concrete strength = 25MPa

9. An ISMB 250 is supporting a slab of thickness 120mm.the steel beam of 5.5m span are spaced at 4m interval. The slab is subjected to a super imposed load of 2 kN/m2. Examine the design of suitable connectors between steel beam and RC Slab to ensure full interaction

BT-3

10. A simply supported composite beam of span 10m is subjected to an imposed load of 3 kN/m2, portion load of 1.5 kN/m2 and floor finishes of 0.5kN/m2.The beams are spaced at 3m centers. The adequate section in composite stage under above loading is given in fig. Investigate the design of shear connectors for the beam. Take the grade o f concrete as M30 and the 100mm headed shear connected.

2500mm

125mm

ISMB 450

BT-3

11. Assess the various types of shear connectors. BT-5

12. Invent the failure of shear connection. BT-6PART-C

1. Explain the various forms of partial shear interaction. BT-2

2. Investigate the failure modes of connections in composite sections. BT-4

3. Prioritize the degree of shear connection. BT-5

4. Discuss the case study on shear connections. BT-2

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DEPARTMENT OF CIVIL ENGINEERING VALLIAMMAI ENGINEERING COLLEGE

Prepared By; Mr.J. Arunraj christadoss, Ap/civil

UNIT 3

DESIGN OF COMPOSITE MEMBERS

Design of composite beams, slabs, columns, beam – columns - design of composite trusses.

PART -A

1. List any two application of composite truss BT-12. Draw the interaction curve for the uniaxial bending column BT-33. Why the circular tubular column is better than other one? BT-44. Defend which type of composite column is suitable in seismic region. BT-55. Why column web stiffeners are provided in a beam column connection? BT-26. How the effective breadth of the composite beam is considered? Why? BT-27. Draw the bending stress diagram of a composite beam (with the provision of

profile sheeting) when the neutral axis is within the concrete slab. BT-3

8. Write the serviceability limit state of composite beam BT-69. List any two applications of composite trusses BT-310. Draw the interaction curve of a composite column subjected to compression and

uniaxial bending BT-6

11. How to evaluate the plastic resistance of concrete filled tubular compositecolumn

BT-5

12. List the various forces at a composite beam column connection. BT-113. Explain the structural elements in composite floor. BT-214. What is the deflection limit alue of profiled sheeting as per EC4? BT-415. Why the circular tubular column is better than the other ones? BT-216. What are the two types of profile deck? BT-117. Develop the effective span, if profiled decking sheets are used in composite

floor. BT-4

18. What are the serviceability criteria as per EC4? BT-119. What is the significance of non-dimensional slenderness with respect to

composite columns? BT-1

20. State the suitability of composite trusses. BT-1

PART-B 1. Check the adequacy of the continuous composite profile deck slab of 130mm

deep, spanning 3m.Thecross section of the profiled sheeting is as shown in fig.2. The live load of the slab is 3kN/m2.The slab is propped at the center during construction stage. Use M20 concrete. Consider the construction load as 0.75kN/m2.

BT-5

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DEPARTMENT OF CIVIL ENGINEERING VALLIAMMAI ENGINEERING COLLEGE

Prepared By; Mr.J.Arunraj Christadoss ,Ap/civil

Decking sheet data Yield strength of steel = 280N/mm2 Design thickness = 1.2mm Effective area of cross section – 1231mm2/m Moment of inertia – 0.605x106 mm4/m Plastic moment of resistance – 3.1 kNm/m Distance of centroid above base = 22.5mm Distance of plastic neutral axis above base =25mm Resistance to vertical shear – 30 kN/m Resistance to longitudinal shear m-184 N/mm2 Modulus of elasticity of steel = 2x105 N/mm2

2. Obtain plastic resistance of a steel section made of ISHB300 encased in M30 concrete. The height of the column is 3.5 m and is pinned ended. The details of the section are given as The dimension of the column is 400mm x 400mm Reinforcing steel Fe 415 – 0.5% of gross concrete area.

BT-4

3. Estimate a composite section without shores, for use as an interior floor beam. Span of the beam =8.5m Spacing of beam = 2.5m Thickness of slab = 100mm Dead load = 2.5kN/m2 Live load = 7.5kN/m2 Concrete strength = 20 MPa Modular ratio = 9

BT-2

4. Estimate the adequacy of concrete encased composite section for biaxial bending. The details of the section are given as The height of the column is 3m and pinned ended. The dimension of the column is 500mm x500mm Use M30 grade of concrete Use ISHB 350RSJ section. Reinforcing steel Fe 415 of 4no of 14mm diameter. Design axial load is 1200Kn. The design bending moment about xx axis is 120knm. The design bending moment about yy axis is 100kNm.

BT-2

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Prepared By; Mr.J.Arunraj Christadoss ,Ap/civil

5. Obtain plastic resistance of a steel section made of ISHB300 encased in M25concrete. The height of the column is 3.5 m and is fixed ended. The details of the section are given as The dimension of the column is 400mm x 400mm Reinforcing steel Fe 415 – 0.5% of gross concrete area. The cover to the flanges will be 50mm.

BT-4

6. A composite truss of span 12m as shown in fig 1 with following data. i) Slab thickness-120mm ii) Profile depth – 75mm iii) Self-weight of the slab – 2.8kN/m2 iv)spacing of truss- 2.5m c/c v) Construction load – 1 kN/m2 vi) Live load – 2.5kN/m2 vii) Maximum laterally unrestrained length in top chord is 1.5m viii) Grade of concrete M30 Estimate the top and bottom chord of the composite truss.

BT-2

7. Design the simply supported composite beam of span 12m as shown in the figure.1 for its construction Stage. The thickness of slab is 135mm. the expected construction load on the slab is 1kN/m2. Assume the Grade of concrete as M30, yield stress of structural steel is 250KN/m2 and density of concrete is 24kN/m2. Use partial safety for both live load and dead load as 1.5.

BT-6

8. Describe about the determination of ultimate moment capacity of a composite beam section with the provision of profile sheeting and compare with the ultimate capacity of IS11384 provision.

BT-1

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DEPARTMENT OF CIVIL ENGINEERING VALLIAMMAI ENGINEERING COLLEGE

Prepared By; Mr.J.Arunraj Christadoss ,Ap/civil

9. Design a tension member of a composite truss to transmit axial load of 160KN. Also design the end connectivity length of the member is 3.5m.

BT-3

10. Obtain plastic resistance of a steel tubular section 380 mm external diameter and 360mm internal diameter in- filed with M30 concrete. The height of the column is 3.5m and is pinned at one end and fixed on the other end.

BT-4

11. Design a concrete encased composite construction subjected to a biaxial bending. The details of the section are given as i. the height of the column is 3.25m and pinned ended. ii. the dimension of the column is 400mm x 400mm iii Use M30 grade of concrete iv. Reinforcing steel Fe 415- 0.5%of gross cross sectional area Design axial load is 850kN vi. The design bending moment about xx axis is 90 kNm the design bending moment about yy axis is 75 kNm Use ISHB 250RSJ section.

BT-1

12. The composite column of size 400X400X400 mm under the design axial load of 1500 KN and bending moment about XX axis is of 200 kNm with steel section ISMB 250 is at the center. Steel reinforcement is 4 No’s of 12 mm dia bars. Check the adequacy of the Section for uniaxial bending. Adopt M30 and Fe 415 steel

BT-1

PART-C

1. Draw forces at a composite beam-column joint due to moment and write the steps in the connection moment capacity calculation.

BT-6

2. Discuss in details about shear connectors and its types. BT-23. Design a composite section without shores, for use as an interior floor beam.

Span of the beam = 9m, spacing of beam= 3m, thickness of slab= 120mm, dead load = 3 kN/m2, Live load = 7.5 kN/m2, concrete strength= 25 MPa and modular ratio = 9.

BT-6

4. Obtain plastic resistance of a steel section made of ISHB 300 encased in M 35 concrete. The height of column is 3.5m and is pinned ended. The details of the section are given as the dimension of the column is 500 mm x 500 mm reinforcing steel Fe 415- 0.5% of gross concrete area.

BT-4

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DEPARTMENT OF CIVIL ENGINEERING VALLIAMMAI ENGINEERING COLLEGE

Prepared By; Mr.J.Arunraj Christados, Ap/civil

UNIT 4

COMPOSITE BOX GIRDER BRIDGES

Introduction - Behaviour of box girder bridges - design concepts.

PART -A

1. List the various forces acting in any composite connection BT-1

2. Define box girder bridges BT-1

3. List out the advantages of box girder bridges BT-1

4. What are the design concepts in box girder bridges BT-2

5. Recall the trusses? BT-1

6. Write short notes on composite trusses BT-2

7. Under what circumstance composite box girders are favored? BT-4

8. How composite construction proves to be more advantageous for bridges? BT-3

9. Discuss about shear span? BT-2

10. Explain behavior of composite bridge. BT-3

11. Examine the transformed section? BT-3

12. Compare the significance of non-dimensional slenderness with respect tocomposite columns?

BT-4

13. State the suitability of composite trusses BT-1

14. Sketch some typical connections adopted in composite trusses. BT-3

15. Define the term Elastic shear flow. BT-1

16. Draw a multi cell box girder bridge and mention the components parts involved. BT-2

17. Defend the term Shear lag in the design of composite box girder bridgestructure.

BT-5

18. Select the use of neoprene pads. BT-5

19. Develop the advantage of box girder bridge over I Beam girder BT-6

20. Assemble the function of intermediate cross girder in hogging moment region? BT-6

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DEPARTMENT OF CIVIL ENGINEERING VALLIAMMAI ENGINEERING COLLEGE

Prepared By; Mr.J.Arunraj Christados, Ap/civil

PART-B

1. a) Elaborate the bending, torsion, and distortion behavior of box girder bridges. b) What are the basic variables required to make a cross section of box girders. Discuss in detail

BT-2

2. Design a composite truss of span 10 m with following data: Truss spacing = 10 m

Slab thickness = 150 mm

Profile depth = 75 mm

Self-weight of deck slab = 2.8 kN/m2 Maximum laterally unrestrained length on top chord = 1.5 m

Adopt M 30 grade concrete

BT-6

3. Discuss the following: a) Advantages of box girder bridges.

b) Efficiency of single and multicelled box girder bridges.

BT-2

4. Explain the behavior of box girder bridge under bending, torsion, torsional warping and Distortion

BT-2

5. Briefly describe the following i) Initial design criteria of composite girder bridges

ii)Cross-section arrangement

iii) Section depth iv)Economic and practical consideration

BT-3

6. Briefly discuss about the ultimate limit state design of box section beams with and without longitudinal stiffeners

BT-1

7. Define the terms.

a) Longitudinal stiffeners b) Studs c) connecters

BT-1

8. i) Recall the advantages of composite construction in bridges. ii) Detail the AASHTO specification with regard to the design of composite bridges.

BT-1

9. Test the composite box girder to suit the following data. BT-4

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DEPARTMENT OF CIVIL ENGINEERING VALLIAMMAI ENGINEERING COLLEGE

Prepared By; Mr.J.Arunraj Christados, Ap/civil

Span of the girder = 10 m Dead load moment = 370 kNm

Live load moment = 725 kNm

Thickness of slab = 100mm

Concrete strength = 25 MPa

Modular ratio = 9

10. Compare the various forms of composite box girder bridges with neat sketches. What are the advantages of box Girder Bridge?

BT-4

11. Illustrate the behavior of ultimate limit state design of box section beams with and without longitudinal stiffeners.

BT-5

12. Write the step-by –step procedure adopted in box girder bridges. BT-3PART-C

1. Explain in details about single cell and multicellular box girder bridges. BT-2

2. List out the case studies on Prestressed box girder bridges. BT-1

3. Sketch in details about type of box girder bridges. BT-3

4. Write the detailed study report on R.C.C box girder bridges and Prestressed box girder bridges.

BT-6

UNIT 5

CASE STUDIES

Case studies on steel - concrete composite construction in buildings - seismic Behaviour of composite structures.

PART -A

1. Mention the types of commonly used structural steels. BT-1

2. Explain Seismic response spectrum analysis. BT-2

3. Write two economic benefits of steel composite structures. BT-3

4. Mention the types of load combination to be considered while design acomposite structure under seismic consideration.

BT-1

5. Write two factors to be considered while designing the composite structureunder seismic loads.

BT-3

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Prepared By; Mr.J.Arunraj Christados, Ap/civil

6. Formulate the mathematical model of a simple beam subjected to seismic force. BT-6

7. Define the second order effect? BT-1

8. Which type of composite column is suitable in seismic region? BT-2

9. List out the seismic behavior of slab BT-1

10. Memorize the seismic behavior of beam BT-1

11. Repeat the seismic behavior of column BT-1

12. Discuss in details about seismic behavior of connections BT-2

13. Classify the response of composite structures to seismic effects? BT-2

14. Employ additional precautions are to be taken for composite structure to resistseismic forces?

BT-3

15. Give two classical examples of composite structures. BT-3

16. Compare the properties of steel and concrete member. BT-4

17. How to safe guard the bridge girders falling from piers when it is subjected toseismic forces?

BT-5

18. Evaluate the conditions are considered in the design of steel composite joints forseismic zone?

BT-5

19. Differentiate between the linear static and linear dynamic procedure for seismicanalysis for seismic analysis of steel concrete composites.

BT-4

20. What do you know about force transfer of composite members? BT-6

PART-B

1. Discuss a case study on steel concrete composite construction in buildings BT-2

2. Explain the seismic behavior of composite beams and columns BT-1

3. Describe in detail about the steel concrete steel sandwich construction design criteria and possible failure modes. Also discuss the various applications

BT-1

4. Discuss a cost effective study of steel concrete composite construction over conventional construction in building sector

BT-4

5. Explain the factors to be considered while the designing the composite structure under

BT-2

6. Seismic loads. Also explain the seismic behavior of composite beams. BT-1

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Prepared By; Mr.J.Arunraj Christados, Ap/civil

7. Write notes on seismic behavior of: i. Composite columns

ii. Composite slabs

BT-2

8. Write notes on seismic behavior of Composite connections BT-3

9. Discuss the common construction methods in composite design in respect of buildings.

BT-3

10. i) How are composite structures made seismic resistant. ii) Detail the codal provision relating to the design of composite structure for seismic loads

BT-3

11. Explain the effect of rigid and semi rigid connectivity between column and beams when frames are subjected to seismic forces. Discuss the codal provisions

BT-5

12. Discuss in details about rigid and semi rigid connection in composite structures BT-6

PART-C

1. List out the factors should consider in seismic Behaviour of steel concrete composite structures.

BT-1

2. Explain in details about seismic behavior of composite beam and column structures

BT-2

3. Differentiate in details about seismic case study on steel concrete composite structures.

BT-4

4. Write in details about seismic connection suitable in steel concrete composite structures.

BT-6

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