|
Retrofit
of Structures Summary
of Activities Structures may become inadequate during service due
to various reasons including design and construction errors, deterioration,
damages from earthquakes, fires and overloading, increased loads as a result
of more stringent code requirements (e.g. revisions to take seismic risks
into account) or functional changes. In all such cases, cost effective
solutions are required for the retrofit/strengthening of structures. The
Centre’s research in this area is mainly concerned with the use of fibre-reinforced polymer (FRP) and other advanced
composites in the retrofit of structures. One of its current focuses is the
seismic retrofit of reinforced concrete (RC) buildings. Technological
services provided in this area include the following:
Representative
Projects ·
High-performance structures ·
Shear behaviour and strength of RC beams
strengthened with FRP ·
RC beams strengthened with near-surface mounted FRP ·
Enhancement of seismic resistance of RC structures
through the use of FRP composites ·
Strengthening of steel structures with FRP ·
FRP composites with intelligent sensors for
applications in the civil infrastructure ·
RC columns strengthened with FRP jackets: behaviour, modeling and design ·
Development of
a ·
Optimized thin textile reinforced cementitious composites for flexural strengthening of RC
structures Major Facilities ·
MTS shaking table ·
Loading frames for beam, slab
and column tests ·
MTS testing machine for
compression/tension tests ·
Advanced Finite element
packages
The
flexural capacity of RC beams can be increased by bonding an FRP soffit
plate. A possible failure mode for such beams is debonding
at one of the plate ends.
The
shear capacity of RC beams can be increased by bonding FRP strips. Debonding is the likely strength-governing mode of
failure for a beam bonded with U strips or side strips.
FRP jackets can be used to
confine RC columns to enhance their strength and ductility. FRP jacketing of
RC columns has become a popular seismic retrofit technique.
FRP jacketing can
effectively suppress the local buckling failure of steel tubular columns and
leads to large increases in ductility but limited increases in ultimate load.
Such FRP jacketing therefore offers an attractive seismic retrofit solution. Selected
Publications 1.
Anggawidjaja, D., Ueda, T., Dai, J.G. and Nakai, H. (2006) “Ultimate deformation of RC piers
wrapped with new fiber-reinforced polymer with large fracture strain”, Cement and Concrete Composites, 28(10): 914-927. 2.
Chen, J.F. and Teng, J.G.
(2001) “ 3.
Chen, J.F. and Teng, J.G.
(2003) “Shear capacity of FRP-strengthened RC beams: FRP
rupture”, Journal of Structural
Engineering, ASCE, 129(5): 615-625. 4.
Dai, J.G, Ueda, T. and Sato Y. (2005) “Development of nonlinear
bond stress-slip model of FRP sheet-concrete interfaces with a simple
method”, Journal of
Composites for Constructions, ASCE, 9(1): 52-62. 5.
Dai, J. G., Ueda, T. and Sato, Y. (2007)
“Bonding Characteristics of Fiber Reinforced Polymer Sheet-Concrete
Interfaces under Dowel Load”, Journal of Composites for Construction, ASCE, 11(2): 138-149. 6. De Lorenzis, L. and Teng, J.G. (2007) “Near-surface mounted FRP reinforcement: an emerging technique for strengthening structures”, Composites Part B-Engineering, 38(2): 119-143. 7.
Hollaway, L.C. and Teng, J.G. (Eds) (2008)
“Strengthening and Rehabilitation of Civil Infrastructures Using FRP
Composites”, Woodhead Publishing Limited, 8.
Lam, L. and Teng, J.G.
(2008) “Stress-strain model for FRP-confined concrete under cyclic
axial compression”, Engineering
Structures, in press. 9.
Lu, X.Z., Teng, J.G., Ye,
L.P and Jiang, J.J. (2005) “Bond-slip models for FRP sheets/plates
bonded to concrete”, Engineering
Structures, 27(6): 920-937. 10.
Lu, X.Z., Teng, J.G., Ye, L.P and Jiang,
J.J. (2007) “Intermediate crack debonding in FRP-strengthened RC beams: FE analysis and
strength model”, Journal of
Composites for Construction, ASCE, 11(2): 161-174. 11. Smith, S.T. and Teng, J.G. (2001) “Interfacial
stresses in plated beams”, Engineering Structures, 23(7): 857-871. 12. Smith, S.T. and Teng, J.G. (2002) “FRP-strengthened RC beams-I:
Review of debonding strength models; II: Assessment
of debonding strength models”, Engineering Structures, 24(4): 385-417. 13. Teng, J.G., Chen,
J.F., Smith, S.T. and Lam, L. (2002) “FRP-Strengthened RC Structures”, John Wiley and Sons Ltd, 14. Teng, J.G. and Lam,
L. (2004) “Behavior and modeling
of FRP-confined concrete”, Journal
of Structural Engineering, ASCE, 130(11): 1713-1723. 15.
Teng, J.G., Yuan, H.
and Chen, J.F. (2006) “FRP-to-concrete interfaces between two adjacent
cracks: theoretical model for debonding
failure”, International Journal
of Solids and Structures, 43(18&19): 5750-5778. 16.
Teng, J.G. and Hu, Y.M. (2007) “Behaviour of FRP-jacketed circular
steel tubes and cylindrical shells under axial compression”, Construction and Building Materials,
21(4): 827-838. 17.
Teng, J.G., Huang,
Y.L., Lam, L. and Ye, L. (2007) “Theoretical model for fiber reinforced polymer-confined concrete”, Journal of Composites for Construction,
ASCE, 11(2): 210-210. 18.
Teng, J.G. and 19.
Wang, B., Teng, J.G., De Lorenzis, L., Zhou, L.M., Ou,
J., Jin, W. and Lau, K.T. (2008) “Strain monitoring of RC members
strengthened with smart NSM FRP bars”, Construction and Building Materials, in press. 20.
Zou, X.K., Teng, J.G., De Lorenzis, L. and
Xia, S.H. (2007). “Optimal performance-based design of FRP jackets for
the seismic retrofit of reinforced concrete frames”, Composites-Part B: Engineering,
38(5&6): 584-597.
This book published in 2002 provides a comprehensive
treatment of the behaviour and design of
FRP-strengthened RC structures based on research conducted up to 2001.
This
book published in 2008 discusses the use of externally-bonded fibre-reinforced polymer (FRP) composites to strengthen,
rehabilitate and retrofit civil engineering structures, covering such aspects
as material behaviour, structural design and
quality assurance. Contact
Information of the contact person Prof. Jin-Guang Teng Fax:
+ 852 - 2766 1354 Research Centre for Urban Hazards Mitigation |
