Research overview – Structures - Welcome to City · Research overview – Structures ... concrete...

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Research overview – Structures Professor A J Kappos Visit of Chinese Academics to the Civil Engineering Department, 20 Sep. 2016

Transcript of Research overview – Structures - Welcome to City · Research overview – Structures ... concrete...

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Research overview – StructuresProfessor A J Kappos

Visit of Chinese Academics to the Civil Engineering Department, 20 Sep. 2016

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The Structures groupProfessor Ashraf Ayoub

Professor Cedric D’Mello

Professor Andreas Kappos

Dr Agathoklis GiaralisSenior Lecturer

Dr Brett McKinleySenior Lecturer

Dr Tatyana MicicSenior Lecturer

Dr Feng FuLecturer

Dr Panagiotis MergosLecturer

Dr Alfredo CamaraLecturer

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£800K investment in equipment for teaching and research

Servo-controlled concrete testing including FRC post-peak

HPC, VHPC & UHPC concrete mixing in large volumes for research with moisture monitoring for repeatable mixing

High flow computer-controlled hydraulic loading for static, cyclic and dynamic & hybrid testing with ring-main

Loading frames including strong-wall for lateral loading of tall structures

The Heavy Structures Laboratory

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Key research areas Types of structures studied:

• Buildings • Bridges• Nuclear structures • Offshore structures

Types of ‘special’ loadings studied:• Earthquake• Blast/explosion• Fire

Types of approaches used:• Analytical (finite element modelling)• Experimental (laboratory and in situ testing)• Empirical (statistical)

including complex/special ones

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• Structural health monitoring via wireless sensor networks using compressive sensing data acquisition techniques (EPSRC funded project)

Pulse-like accelerogramsHurricane wind field

TMDI Inerter

Dr Agathoklis Giaralis WSN

CSP node

Seismic pounding Jack-up platforms• Seismic analysis and assessment of ordinary and special structures using beyond-codes-of-practice Monte Carlo-based and Stochastic Dynamics-based techniques (Internally funded project)

• Vibration control and energy harvesting from wind/wave/earthquake excited structures using the novel lightweight tuned mass-damper-inerter (TMDI) device (EPSRC funded project)

• Wavelet-based stochastic modelling, representation, and simulation of extreme dynamic loads in earthquake, wind, and wave engineering applications (Internally funded project)

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Improving the financial and environmental cost of steel framed buildings

• Product development in composite construction– Floor dynamics, strength,

stiffness, interface strength• Industry supported• Impact

– Six design guides– Two software suites– Products account for c.7% of

commercial market Cellular beams, Ultra shallow floor beams (USFB), Bi-Steel/Corefast, Slimflor, Slimdek, Asymmetric beams (ASB)

Professor D'Mello &Dr Brett McKinley

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LVDTs

Load Cells

RC Foundation

Strong Floor

ActuatorDisplacementTranducers

Reaction Wall

Hydraulic JacksSteel Beam

Wall

MassesRigid Links

Prof. A. AyoubRoyal Academy of Engineering/Pell Frischmann Chair

Shake Table Tests

Static Load Tests

Multi-Scale Analysis

Analysis of Nuclear Structures

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• Seismic assessment and retrofit of reinforced concrete structures with sub-standard detailing

(Mergos and Kappos 2008, 2010, 2012, 2013) Shear failure

Dr Panagiotis Mergos

• Inelastic lateral response of slender concrete walls in tall buildings

(Mergos and Beyer 2013)

• Rocking isolation of structures resting on spread foundations

(Mergos and Kawashima 2005)

• Cumulative damage effects and cyclic testing of structures

(Mergos and Beyer 2014)

FRP retrofit

Cyclic testing of timber walls

Bridge piers with and without uplift

Inter-storey drifts of tall buildings with concrete walls

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Dr Feng Fu

• Progressive collapse analysis of long span structures and tall buildings under earthquake, explosion and fire

• Full scale testing on structures under extreme loading condition

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Analysis of the elastic and inelastic response of R/C structures (buildings, bridges, etc.) using member-by-member models (lumped or distributed plasticity), and members under monotonic and cyclic bending and shear, using member-type, fibre, or finite element models.

Experimental study of reinforced concrete members (beams, walls, slabs) under monotonic and reversed cyclic loading.

Elastic and inelastic analysis of (load-bearing) masonry buildings using equivalent frame or finite element models.

Repair and strengthening of R/C members using conventional methods or FRP’s –Experimental and analytical studies.

Constitutive laws for normal and high-strength confined concrete Analysis of pounding between adjacent structures (buildings, bridge segments) –

Methods based on impact laws and/or dimensional analysis. Vulnerability to earthquakes of R/C and masonry structures – Analytical, empirical,

and hybrid methods. Cost-benefit and life-cycle cost methods for pre-earthquake strengthening of

structures. Improved seismic design methods include performance-based and deformation-

control methods – Design methods involving use of advanced analysis tools.

Prof. A. J. Kappos

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International impact of our research

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Constitutive modelling of confined concrete

Papanikolaou, V.K. and Kappos, A.J. “Numerical study of confinement effectiveness in solid and hollow reinforced concrete bridge piers: Methodology”, Computers and Structures, V. 87, no. 21-22, 2009.

incorporated in ATENA

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Papanikolaou, V.K. and Kappos, A.J. “Numerical study of confinement effectiveness in solid and hollow reinforced concrete bridge piers: Methodology”, Computers and Structures, V. 87, no. 21-22, 2009.

Application of the optical integration method

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Mergos, P.E. and Kappos, A.J. “A gradual spread inelasticity model for R/C beam-columns, accounting for flexure, shear and anchorage slip”, Engineering Structures, V. 44, Nov. 2012.

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Nonlinear rotational

spring

Rigid arm

Rigid arm

Modelling of inelastic shear effects

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Mergos, P.E. and Kappos, A.J. “A gradual spread inelasticity model for R/C beam-columns, accounting for flexure, shear and anchorage slip”, Engineering Structures, V. 44, Nov. 2012.

Analysis of Duong et al. (Un. Toronto) frame specimen, using IDARC-AUTh (b) base shear vs. top displacement prediction by FSB model; c) base shear vs. top displacement predictions by F and FB models; d) pushover curves from different finite element models; e) first storey beam shear force vs. shear strain response inside plastic hinges; f) first storey beam shear force vs. shear strain response outside plastic hinges.

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Mitolidis, G.J., Salonikios, T.N. and Kappos, A.J. “Test Results and Strength Estimation of R/C Beams Strengthened Against Flexural or Shear Failure by the Use of SRP and CFRP”, Composites – Part B: Engineering, V. 43, no. 3, 2012.

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1001001006030060

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X-Section A-A

All steel reinforcement bars used are SMOOTH

Longitudinal bars' reinforcement is RIBBED

X-Section A-A X-Section Β-Β

Stirups' reinforcement is SMOOTH

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Testing of FRP/SRP-strengthened members

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Mitolidis, G.J. Salonikios, T.N. and Kappos, A.J. “Test Results and Strength Estimation of R/C Beams Strengthened Against Flexural or Shear Failure by the Use of SRP and CFRP”, Composites – Part B: Engineering, V. 43, no. 3, 2012.

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The Research Centre for Civil Engineering Structures was established in 2014

Three key research areas– Tall buildings – Long-span bridges– Nuclear structures

Research questions– How can we design or assess complex engineering structures, like

long-span or irregular bridges, for extreme loadings to ensure high performance?

– Can we achieve “S-cubed” tall buildings using energy harvesting-enabled vibration suppression configurations and autonomous structural health monitoring wireless sensor networks?

– How can we design nuclear power plants under multi-hazard risks?”

http://www.city.ac.uk/department-civil-engineering/research-centre-civil-engineering-structures

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Websites:

www.city.ac.uk/engineering-maths/staff/professor-andreas-kapposajkap.weebly.com/english.html

Monet Le Pont du chemin de fer a Argenteuil

Thank you for your kind attention!

[email protected]:


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