- Application of post-installed anchors for seismic retrofit of RC beam-column joints: design method
- G. Genesio ; R. Eligehausen ; S. Pampanin
- 9th Pacific Conference on Earthquake Engineering (PCEE 2011), Auckland, New Zealand
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Repair and Retrofit of Structures
- Keywords: Concrete structures
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- On the interaction of partial interaction and shrinkage in composite steel-concrete t-beams
- M. Bradford
- Book Title / Journal: Procedia Engineering
- Year: 2011 , Volume: Vol.14 , Series:
- Structure types ; Composite structures
- Description
- The use of composite beams of steel and concrete joined by shear connectors goes back well over half a century, and they are now ubiquitous civil engineering structures. Their populaarity and efficiency derive from the fact that the concrete carries compression and the steel carries tension, thereby making best use of the two materials to enhance the strength and stiffness of the beam when the concrete slab is joined mechanically to the steel girder. Without considering long-term shrinkage and creep effects in the concrete, Newmark, Siess and Viest deriived the classic partial interaction solution in 1951, quantifying the increase in beam's stiffness as the stiffness of the mechanical shear connection increases; the solution being represented with hyperbolic trigonometric functions. With no shear connection between the concrete and steel, the deflection of the beam is based on the flexural stiffness of the two materials alone and any uniform shrinkage deformations of the slab will have no effect on the lateral deflection of the beam. On the other hand, if the shear connection between tthe concrete and steel is infinitely stiff, uniform shrinkage of the slab whose lever arm is eccentric the centroid of the transformed cross-section may lead to considerable shrinkage-based deformations, thereby negating the stiffening effects of the fully-composite action. In theory, a fully-composite beam may deflect more than one without any composite action because of shrinkage-based slab deformations. Using a rational technique based on virtual work, the paper presents a solution for a composite beam with elastic shear connection subjected to slab shrinkage deformations. Its focus is on identifying the competing and coupled influences of stiff partial interaction in reducing deformations, and high shrinkage deformations in causing beam deformations. The solutions may be used to optimise beam deformations, being suitable for deesign.
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- Displacement-based seismic retrofit design for non-ductile RC frame structures using local retrofit interventions at beam-column joints
- W.Y. Kam ; S. Pampanin
- 9th Pacific Conference on Earthquake Engineering (PCEE 2011), Auckland, New Zealand
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Repair and Retrofit of Structures
- Keywords: Concrete structures
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- Three-dimensional fe modelling of simply-supported and continuous composite steel-concrete beams
- F. Tahmasebinia ; G. Ranzi
- Book Title / Journal: Procedia Engineering
- Year: 2011 , Volume: Vol. 14 , Series:
- Structure types ; Composite structures
- Description
- Composite steel-concrete beams represent an economic form of construction used in both building and bridge applications. The composite action is usually provided by the presence of shear connectors welded to the top of the steel joist and embedded in the concrete slab. The flexural response is strongly dependent on the rigidity provided by these connectors. Initial studies in this area highlighted that their deformability needs to be evaluated and included in the modeling for an accurate structural representation. For this purpose, different types of push-out tests have been proposed to date to describe the load-slip relationships of shear connectors. These relationships are usually used in numerical simulations when modeling experimental tests or performing parametric studies. In this context, the finite element model proposed in this paper intends to provide a representation of the composite behaviour of floor beams without the need to rely on constitutive relationships obtained from push-out tests. The model is validated against experimental results available in the open literature carried out using simply-supported and continuous static configurations and based on composite beams with solid and composite slabs.
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- Considerations on the seismic performance of pre-1970s RC buildings in the Christchurch CBD during the 4th Sept 2010 Canterbury earthquake: was that really a big one?
- S. Pampanin ; U. Akgüzel ; W.Y. Kam ; P. Quintana-Gallo
- 9th Pacific Conference on Earthquake Engineering, Auckland, New Zealand, Paper 179
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Earthquake engineering
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- Behaviors of square thin-walled steel tubed RC columns under direct axial compression on RC core
- S. Seangatith ; J. Thumrongvut
- Book Title / Journal: Procedia Engineering
- Year: 2011 , Volume: Vol.14 , Series:
- Structure types ; Composite structures
- Description
- This paper presents an experimental study on the behaviors and modes of failure of square thin-walled steel tubed RC columns subjected to concentrically axial load applied directly to the RC core. The main variables were the compressive strengths of the concrete, the wall thicknesses of the steel tube and the tie spacing. The dimensions of the column specimens were 150 mm wide and 750 mm long. A total of 36 specimens, including 24 tubed RC specimens and 12 RC specimens, were tested. It was found that the tubed RC columns have a linear elastic behavior up to approximately 60-70% of their axial compressive capacity. Then, the behavior of the columns is gradually nonlinear and can be classified into 3 types: strain hardening, elastic-perfectly plastic and strain-softening. The mode of failure of the columns is in progressive mode with very large axial deformability. The wall thickness of the steel tube and the compressive strength of concrete are the major factors, influencing the behaviors, axial compressive capacity and modes of failure of the columns. No full interaction and confinement between the RC core and the steel tube were observed and the EC4 design equations for the composite column significantly overestimate the axial compressive capacity of the tubed RC column.
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- Numerical modelling of local cladding-structure interaction
- A. Baird ; Riccardo Diaferia ; A. Palermo ; S. Pampanin
- 4th Structural Engineers World Congress (SEWC2011-Italy), Como, Italy, Paper 92
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Earthquake engineering
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- Effects of soil-foundation-structure interaction on seismic structural response via robust Monte Carlo simulation
- M. Moghaddasi ; M. Cubrinovski ; J.G. Chase ; S. Pampanin ; A. Carr
- Engineering Structures, Vol. 33, No. 4, pages 1338-1347
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Earthquake engineering
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- NMIT Arts & Media Building - Damage Mitigation Using Post-tensioned Timber Walls
- C.P. Devereux ; T.Z. Holden ; A.H. Buchanan ; S. Pampanin
- 9th Pacific Conference on Earthquake Engineering, Auckland, New Zealand, paper 090
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Earthquake engineering
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- Effects of frame aspect ratio on the seismic performance improvement of panel strengthening technique
- D. Okuyucu
- Ph.D Thesis, the Graduate School of Natural and Applied Sciences of Middle East Technical University
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Repair and Retrofit of Structures
- Keywords: Masonry Structures
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- Terra 2008: The 10th international conference on the study and conservation of earthen architectural heritage
- L. Rainer ; A.B. Rivera ; D. Gandreau
- The Getty Conservation Institute
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Repair and Retrofit of Structures
- Keywords: Masonry Structures
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- Assessment of timber floor diaphragms in historic unreinforced masonry buildings
- A. Wilson ; J.M. Ingham ; P. Quenneville
- Proceedings of the International conference on structural health assessment of timber structures
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Earthquake engineering
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- Sustainable evaluation - concepts to assess the applicability of secondary aggregates in concrete
- T. Herbst ; K. Rubner ; B. Hauer ; B. Meng
- SB11 Helsinki World Sustainable Building Conference, Helsinki, Finland
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Structure types ; Concrete structures
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- Chloride ions penetration in concrete with recycled concrete aggregates
- A. Troian ; A. Werle ; M. Kulakowski ; C. Kazmierczak
- 12DBMC - 12th International Conference on Durability of Building Materials and Components, Porto, Portugal
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Structure types ; Concrete structures
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- Carbonation in concrete with recycled concrete aggregates
- A. Werle ; C. Kazmierczak ; J. Sentena ; M. Kulakowski
- 12DBMC - 12th International Conference on Durability of Building Materials and Components, Porto, Portugal
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Structure types ; Concrete structures
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