CARBON FIBRE FUTURE CONFERENCE ADVANCED MATERIALS FOR ADVANCED MANUFACTURING

Transcription

1 CARBON FIBRE FUTURE CONFERENCE ADVANCED MATERIALS FOR ADVANCED MANUFACTURING MARCH 2017 CFRP-TIMBER COMPOSITE BEAM Mahbube Subhani Research Fellow Sustainable Infrastructure School of Engineering

2 Project APPLICATION OF CFRP FOR CIVIL INFRASTRUCTURE Existing structures Strengthening Retrofitting Design of new structures Reduced cross-section Enhanced performance Use of CFRP create composite structures

3 Durability PREVIOUS PROJECT - 1 CFRP sheet Epoxy layer Assessment of bond strength in CFRP retrofitted beams under marine environment Accelerated ageing Wet-dry cycle Modification of epoxy Effect on bond Strength prediction considering long term effect Deakin University

4 Durability PREVIOUS PROJECT - 2 Strength reduction in square columns confined with CFRP under marine environment Accelerated ageing Wet-dry cycle Effect on bond Effect on confinement considering long term effect

5 Composite Beam PREVIOUS PROJECT - 3 Steel-concrete composite beam (solid slab) CFRP Steel plate Hybrid retrofitting Analytical model modification Partial interaction Beam 6 Beam 7

6 Composite Deck PREVIOUS PROJECT - 4 Steel-concrete composite beam (composite slab) on-going project Strengthening of longitudinal shear of the connections Externally Internally

7 TEAM EXPERTISE PEOPLE FACILITIES PROJECTS CFRP - TIMBER COMPOSITE BEAM Jules Moloney Riyadh Al-Ameri Mahbube Subhani Anastasia Globa Industrial partner

8 Issue CONTINUOUS TIMBER BEAM

9 Proposal CFRP-TIMBER COMPOSITES CFRP Lightweight High strength CFRP-Timber composite Higher moment carrying capacity Reduce cross-section

10 Objectives RESEARCH FOCUS PROJECT 1 Bond analysis between CFRP and timber Effect of adhesive Effect of bond length Effect of timber s grain direction Application of CFRP for positive moment Mode of failure Improvement in load carrying capacity Improvement in ductility Shape of CFRP wrap PROJECT 3 PROJECT 2 Application of CFRP for negative moment Effectiveness of continuation of timber beam using CFRP Improvement in ultimate load and ductility

11 Project 1 BOND: CFRP-LVL Group 1 Group 2 Group 3

12 Test variables BOND: CFRP-LVL Optimum bond length Effective bond length Grain direction parameter Along Across Surface preparation effect Laminates Grain

13 Results BOND: CFRP-LVL Failure modes Group 1 Group 2 Group 3

14 Results BOND: CFRP-LVL Analytical modelling Grain direction parameter Surface preparation parameter Effective length

15 Project 2 POSITIVE MOMENT Grain direction of LVL 240 Grain direction of CFRP Grain direction of LVL Grain direction of CFRP CFRP

16 Results POSITIVE MOMENT

17 Result POSITIVE MOMENT Group Mean P u % increase Mean Stiffness % increase Mean ductility % increase LVL C kn kn/mm LVL S kn 9.20 % 1.62 kn/mm 3.64 % LVL U kn % 1.87 kn/mm %

18 Modelling POSITIVE MOMENT Analytical modelling Non-linear compressive curve of timber ɛ cw f cw h ȳ c F c y c t f Cross-section ɛ tu Strain diagram F fs F t f tu F fl Stress distribution y t

19 Project 3 NEGATIVE MOMENT (ON-GOING)

20 Test set-up NEGATIVE MOMENT (PHASE 1)

21 Test set-up NEGATIVE MOMENT (PHASE 1)

22 Result NEGATIVE MOMENT (PHASE 1)

23 Test set-up NEGATIVE MOMENT (PHASE 2)

24 Photos NEGATIVE MOMENT (PHASE 2 ON-GOING)

25 Mahbube Subhani