- Durability of HPCs containing ternary and binary cementitious materials
- M. Shekarchizadeh ; F. Ghassemzadeh ; B. Mohammadi ; M. Mohebbi ; S. Sajedi
- 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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- Comparative study of nano-sio2 and silica fume on gas permeability of concrete
- M. Valipour ; A. Mirdamadi ; M. Shekarchi
- 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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- Effect of different pozzolanic admixtures on sulfuric acid resistance of concrete
- M. Moradian ; M. Hallaji ; B. Kiani ; M. Shekarchi
- 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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- Study of variation in surface chloride of concrete containing different pozzolans when exposed to a tidal climate in the Persian Gulf region
- M. Valipour ; S. Khani ; F. Pargar ; M. Shekarchi
- 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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- Welded-wire reinforcement versus random steel fibers in precast, prestressed concrete bridge girders
- G. Morcous ; M. Maguire ; M.K. Tadros
- PCI Journal, Spring 2011, pages 113-129.
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Structure types ; Concrete structures
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- Behavior of precast, prestressed concrete sandwich wall panels reinforced with CFRP shear grid
- G. Lucier ; T.K. Hassan ; B.A. Frankl ; S.H. Rizkalla
- PCI Journal, Spring 2011, pages 42-54.
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Structure types ; 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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- 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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- 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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- 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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- Structural behaviour and design of cold-formed steel wall systems under fire conditions.
- S. Gunalan
- Book Title / Journal: PhD thesis, Queensland University of Technology, Australia
- Year: 2011 , Volume: , Series:
- Structure types ; Steel structures
- Description
- This research has developed comprehensive experimental and numerical thermal and structural performance data for both the conventional and the proposed new load bearing LSF wall systems under standard fire conditions. Finite element models were developed to predict the failure times of LSF walls accurately. Idealized hot flange temperature profiles were developed for non-insulated, cavity and externally insulated load bearing wall systems. Suitable fire design rules and spread sheet based design tools were developed based on the existing standards to predict the ultimate failure load, failure times and failure temperatures of LSF wall studs. Simplified equations were proposed to find the critical temperatures for varying wall panel configurations and load ratios. The results from this research are useful to both structural and fire engineers and researchers. Most importantly, this research has significantly improved the knowledge and understanding of cold-formed LSF loadbearing walls under standard fire conditions.
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- Structural and thermal performance of cold-formed steel stud wall systems under fire conditions
- P. Kolarkar
- Book Title / Journal: PhD thesis, Queensland University of Technology, Australia
- Year: 2011 , Volume: , Series:
- Structure types ; Steel structures
- Description
- this research has developed comprehensive experimental thermal and structural performance data for both the conventional and the proposed non-load bearing and load bearing stud wall systems under fire conditions. Idealized hot flange temperature profiles have been developed for non-insulated, cavity insulated and externally insulated load bearing wall models along with suitable equations for predicting their failure times. A graphical method has also been proposed to predict the failure times (fire rating) of non-load bearing and load bearing walls under different load ratios. The results from this research are useful to both fire researchers and engineers working in this field. Most importantly, this research has significantly improved the knowledge and understanding of cold-formed LSF walls under fire conditions, and developed an innovative LSF wall system with increased fire rating. It has clearly demonstrated the detrimental effects of using cavity insulation, and has paved the way for Australian building industries to develop new wall panels with increased fire rating for commercial applications worldwide.
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- Limiting reinforcement ratios for RC f lexural members
- N. Subramanian
The Indian Concrete Journal, pp. 71-80 - Year: 2010
- Structure types ; Concrete structures
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