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INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Composite columns/walls with several encased
steel profil...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Overview
1 Presentation of INSA Rennes
2 A little bit ab...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Location
 45 min from the coast
 2 hours from Paris
 ...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Presentation of INSA Rennes
Founded in 1966, INSA-Rennes...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Presentation of INSA Rennes
INSAdeRennes5/25 Seminar UWS...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
A little bit about me
Huy through time
2005: Graduated f...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
My research areas
Computational modeling of composite st...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
My research areas
1Q
2Q
3Q
4Q
5Q
( )scD x
zp
Force-based...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
My research areas
Experimental and numerical studies of ...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
My research areas
Experimental and numerical studies of ...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Outline
3 Hybrid columns/walls with several encased stee...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Hybrid columns/walls: resistance to bending and shear
• ...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Hybrid columns/walls: resistance to bending and shear
Ga...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Hybrid columns/walls: resistance to bending and shear
Pr...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Hybrid columns/walls: resistance to bending and shear
C-...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Hybrid columns/walls: resistance to bending and shear
Es...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Hybrid columns/walls: resistance to bending and shear
Ca...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Hybrid columns/walls: resistance to bending and shear
Tr...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Hybrid columns/walls: resistance to bending and shear
Tr...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Hybrid columns/walls: resistance to bending and shear
Ch...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Hybrid columns/walls: resistance to bending and shear
Nu...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Hybrid columns/walls: resistance to bending and shear
 ...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Collaboration INSA-UWS: Hybrid columns/walls under
Eleva...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Collaboration INSA-UWS: Hybrid columns/walls under
Eleva...
INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS
Thanks for your attention !
... any questions ?
25/25 Se...
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Seminar at University of Western Sydney

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DESIGN METHOD FOR COMPOSITE COLUMNS with several encased steel profiles under combined shear and bending

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Seminar at University of Western Sydney

  1. 1. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Composite columns/walls with several encased steel profiles Ass. Prof. Quang-Huy Nguyen Structural Engineering Research Group, INSA de Rennes, France 11 July 2014 1/25 Seminar UWS, July 11, 2014
  2. 2. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Overview 1 Presentation of INSA Rennes 2 A little bit about me 3 Hybrid columns/walls with several encased steel profiles 4 Collaboration INSA-UWS 2/25 Seminar UWS, July 11, 2014
  3. 3. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Location  45 min from the coast  2 hours from Paris  An internationally renowned centre for third-level education and research  420 000 inhabitants, 60 000 students and 4 500 researchers Rennes, University city in the heart of Brittany 3/25 Seminar UWS, July 11, 2014
  4. 4. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Presentation of INSA Rennes Founded in 1966, INSA-Rennes is one of France’s top graduate engineering schools, specialised in : • Information, Communication Systems &Technologies • Materials, Structures & Mechanical Engineering INSA‐Rennes figures • + than 1700 students • 7 masters in engineering • 6 research laboratories • 160 PhD‐students • 274 Engineers awarded a  diploma in 2012 • 7 300 INSA graduated engineers worldwide 8th best engineering school in France (2013 national ranking). INSA‐Rennes is ranked among the top universities of Science and Technology in Europe, pluridisciplinary and international. 4/25 Seminar UWS, July 11, 2014
  5. 5. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Presentation of INSA Rennes INSAdeRennes5/25 Seminar UWS, July 11, 2014
  6. 6. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS A little bit about me Huy through time 2005: Graduated from INSA Rennes, France; 2005-2009: PhD in structural engineering from INSA Rennes and University of Wollongong, Australia; From 2010: "Maître de Conférences", INSA Rennes. 2009-2010: Research Engineer at Structural Engineering Research Group, INSA Rennes; 6/25 Seminar UWS, July 11, 2014
  7. 7. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS My research areas Computational modeling of composite steel-concrete structures Material and geometrical nonlinearities; Time effects: creep and shrinkage; Vibration; Buckling. 7/25 Seminar UWS, July 11, 2014
  8. 8. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS My research areas 1Q 2Q 3Q 4Q 5Q ( )scD x zp Force-based formulation x y 1g 1g lx ly 2g 2g 1a 2a 2b 1b 1a 2a1b 2b z Co-rotational kinematic M A 1R 2R 0 90 100mmL  a a (1) (2) 1mmb  1 3mmh  2 1mmh  (1) (2) Section a-a 1 2 12GPa 24GPa 0GPasc E E k    Computational modeling of composite steel-concrete structures 8/25 Seminar UWS, July 11, 2014
  9. 9. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS My research areas Experimental and numerical studies of Concrete-Timber Structures Push-out static, cyclic and fire tests; Modeling of seismic and fire behaviour of composite Concrete-Timber floors. Concrete-timber floor Fire test Firetest9/25 Seminar UWS, July 11, 2014
  10. 10. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS My research areas Experimental and numerical studies of new “hybrid” Steel- Concrete Structures Static Pushover tests of Composite columns reinforced by several fully encased steel profiles; Finite Element analysis of hybrid structures using Abaqus; Developing of Finite Element model for buckling analysis of hybrid columns. Hybrid beam/column Hybrid joinst 10/25 Seminar UWS, July 11, 2014
  11. 11. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Outline 3 Hybrid columns/walls with several encased steel profiles Definition Pre-design of test specimen Estimation of design resistance Abaqus 3D model 11/25 Seminar UWS, July 11, 2014
  12. 12. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Hybrid columns/walls: resistance to bending and shear • Composite walls or columns reinforced by several fully encased steel sections are specific composite concrete-steel structural elements used in heavily loaded structures. • They belong to structures defined as “hybrid”, which means that they are neither reinforced concrete structures in the sense of Eurocode 2, nor composite steel concrete structures in the sense of Eurocode 4. Hong Kong International Finance Center: Hybrid column with 3 steel section as reinforcement 12/25 Seminar UWS, July 11, 2014
  13. 13. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Hybrid columns/walls: resistance to bending and shear Gaps in knowledge are mostly related to the problem of force transmission between concrete and embedded steel profiles: • for the anchorage in concrete of the extremities of steel profiles; • for the transfer of longitudinal and transversal shear between materials. Objectives • Fill gaps in knowledge and provide design guidance for concrete components reinforced by several fully encased steel sections  based on the logics of composite sections and of reinforced concrete sections, like equivalent sections and struts and ties mechanisms  refer to design values for bond, for shear connectors, resistances, etc, as they are stated in Eurocode 2 and 4. • The generic design approach will then be used to design experiments, the results of which will serve to validate and calibrate the generic design approach. • The outcome will be design guidance implementable in Eurocode 2 or 4. 13/25 Seminar UWS, July 11, 2014
  14. 14. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Hybrid columns/walls: resistance to bending and shear Pre-design of specimens The specimens are first pre-designed based on:  the capacity of two hydraulic jacks of INSA Laboratory (3000 kN).  the assumption of full plastic bending moment  the assumption of equal resistances between flexion and transverse shear. Choices of data  Distance between two axes of supports (effective length): L = 3750 mm  Design concrete resistance: fc = fck = 40 MPa ;  Steel profile resistance: fy = 460 MPa (S460);  Steel rebar resistance: fyk = 500 MPa;  Dimensions of the cross-section: height h = 820 mm and width b = 200 mm. Specimen Steel profile Longitudinal rebar Stirrups and pins Stirrup spacing (mm) Connector Connector spacing (mm) C-W 3 HEB100 8 HA20 HA12 200 40 Nelson H3L16mm 200 Resistance to combined bending and shear Test set up for bending & shear 14/25 Seminar UWS, July 11, 2014
  15. 15. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Hybrid columns/walls: resistance to bending and shear C-W specimen 15/25 Seminar UWS, July 11, 2014
  16. 16. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Hybrid columns/walls: resistance to bending and shear Estimation of bending resistance • Number of shear studs to ensure the full interaction : Longitudinal shear force acting on the shear studs from mid-span to the support is: Design resistance of one Nelson H3L16mm stud • Bending moment resistance (EC4 §6.7.3.2):  Corresponding jack load: L min Rd 1196 19 shear studs per half span 64 V n P    ( / 2) ( 0) 21196kNL s s s yV F x L F x A f      2 Rd 0.8 / 4 64kNu v f d P     pl,Rd 1342 kNmM  pl,Rd pl,Rd4 4 1373 1431 kN 3.75M M F L     Ed N Rd M Ed V h / 2L h b a z a z c z c z s y sF f A 0.85 cf cF s y sF f A s y sF f A 16/25 Seminar UWS, July 11, 2014
  17. 17. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Hybrid columns/walls: resistance to bending and shear Calculation of transverse shear resistance • Complete section is divided into two sub-sections • Distribution of transverse shear force into the sub-section:  Method based on the theory of elastic beams (Plumier et al. (2013))  Method based on EC4-1 §6.7.3.2(4) Sub-section 1: 1 Ed1 Ed Ed0.681 eff eff EI V V V EI   Sub-section 2: Ed2 Ed Ed1 Ed0.319V V V V   pl,Rd1 Ed1 Ed Ed pl,Rd 0.699 M V V V M   Ed2 Ed Ed1 Ed0.301V V V V   Conclusion: Two methods give almost the same transverse shear distribution. h b a z a z c z c z a h c a b b h  17/25 Seminar UWS, July 11, 2014
  18. 18. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Hybrid columns/walls: resistance to bending and shear Transverse shear resistance of sub-section 1 ha za za Ed1V 100 270 270 Ed1V aV aV aV cF cF za za 45° Ed1V cF aV z / 2a za za za cF aV aV 45  Ed1V Proposed strut-and-tie model  c Ed1 a a a Ed1 a 2 2 6 6 c a a a c a a a a c a a E h z F V G A E h z G A V V G A E h z     c Ed1 a Ed1 0.234 0.113 F V V V   Conclusion: The results shown that the part of applied shear VEd1 in sub-section 1 going into the three steel profiles is about 34%. This is to say that the concrete struts take 66% of applied shear VEd1. Rd, 1 Rd1 Rd, 3 z h 1944 kN 0.234 min 8.85 8142 kN 0.113 c c a a a a y F f V V A f               The failure of the sub-section 1 would be caused by the crushing of compression struts. 18/25 Seminar UWS, July 11, 2014
  19. 19. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Hybrid columns/walls: resistance to bending and shear Transverse shear resistance of sub-section 2 • This sub-section can be considered as RC section so the transverse shear resistance can be computed according to EC2. cw c 1 c Rd2 Rd,max 0.81 797 kN cot tan b h f V V         Transverse shear resistance of total section The transverse shear resistance of total section is indeed deduced from: • Shear resistance of sub-section 1 • Resistance of concrete compression strut of sub-section 2 • Resistance of transverse tie (stirrups) Rd1 Rd2 Rd Rd,s 1944 2781kN 0.699 0.699 797 min 2648 kN 663 kN 0.301 0.301 663 kN V V V V                       (stirrup yielding)  Corresponding jack load: Rd Rd2 1326kNVF V  Bending/shear resistance ratio of C-W specimen: 1431 / 1326 1.08 19/25 Seminar UWS, July 11, 2014
  20. 20. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Hybrid columns/walls: resistance to bending and shear Choices of elements types: • Concrete: Solid element • Steel profile: Solid element • Steel reinforcement: Truss element Prediction of ultimate load using Abaqus 3D model Material models: • Concrete damaged plasticity model • Elastoplastic model for steel 20/25 Seminar UWS, July 11, 2014
  21. 21. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Hybrid columns/walls: resistance to bending and shear Numerical results Design load 1326 kN 21/25 Seminar UWS, July 11, 2014
  22. 22. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Hybrid columns/walls: resistance to bending and shear  A design method has been developed for composite elements reinforced by several encased steel profiles: o Number of connectors to ensure the full interaction o Resistance to bending: based on EC4 - plastic resistance moment of a composite cross-section o Resistance to shear: proposed strut-and-tie model  The design method is more or less calibrated by 3D numerical model  The experimental tests need to be conducted to validate this method. Conclusions 22/25 Seminar UWS, July 11, 2014
  23. 23. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Collaboration INSA-UWS: Hybrid columns/walls under Elevated Temperatures  Aims o Understand the interaction mechanism in hybrid structures when subjected to elevated temperatures o Extend the knowledge of concepts such as stiffness, strength and ductility to hybrid structures with exposed to elevated temperatures o Establish reliable design guidelines for hybrid structures in existing international standards Interaction between Steel and Concrete on Concrete Components Reinforced by Steel Profiles under Elevated Temperatures Quang-Huy Nguyen, INSA de Rennes Olivia Mirza, UWS 23/25 Seminar UWS, July 11, 2014
  24. 24. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Collaboration INSA-UWS: Hybrid columns/walls under Elevated Temperatures  Approach o Numerical Analysis Phase: Thermomechanical 3D Abaqus model o Experimental Phase o Developing a Generic Approach Phase Section A-A 82 20A A unit: cm 200 Interaction between Steel and Concrete on Concrete Components Reinforced by Steel Profiles under Elevated Temperatures Quang-Huy Nguyen, INSA de Rennes Olivia Mirza, University of Western Sydney 24/25 Seminar UWS, July 11, 2014
  25. 25. INSA Rennes Huy’s Bio Hybrid columns/walls Collaboration INSA-UWS Thanks for your attention ! ... any questions ? 25/25 Seminar UWS, July 11, 2014

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