- Non-linear equivalent frame modelling:- Assessment of a two storey perforated unreinforced masonry wall.
- C.L. Knox ; J.M. Ingham
- 2012 New Zealand Society of Earthquake Engineering Conference, Paper 076.
- Book Title / Journal:
- Year: 2012 , Volume: , Series:
- Structure types ; Masonry Structures
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- Assessment of a type of post-tensioned masonry walls system for dwelling construction in seismic prone areas
- A. Orduña ; C. Tula ; R. Licea
- Book Title / Journal: The 15th World Conference on Earthquake Engineering, Lisbon, Portugal, Paper No. 2958
- Year: 2012 , Volume: , Series:
- Structure types ; Masonry Structures
- Description
- This work reports the results of an experimental campaign on a type of dry jointed and prestressed masonry. The
campaign is part of a larger project with the main objective of to develop an innovative wall construction system
for economical dwelling in seismic prone areas of underdeveloped countries. The campaign tested 12 stack bond
prisms and 6 regular bond prisms, in order to measure the strength and Young modulus of the material under
axial compression and to observe the failure modes. Six wallets, postensioned in the head joints direction were
tested in order to determine the diagonal compression strength, the shear modulus, and to observe the failure
mode. Under these simple tests, the proposed material behaves adequately; in particular, the shear failure mode
presents a very large displacement capacity.
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- A gradual spread inelasticity model for R/C beam-columns, accounting for flexure, shear and anchorage slip
- P. Mergos ; A. Kappos
- Book Title / Journal: Engineering Structures
- Year: 2012 , Volume: 44 , Series:
- Structure types ; Concrete structures
- Description
- A new beam-column model is developed for the seismic analysis of reinforced concrete (R/C) structures. This finite element consists of two interacting, gradual spread inelasticity sub-elements representing inelastic flexural and shear response and two rotational springs at the ends of
the member to model anchorage slip effects. The flexural sub-element is able to capture gradual spread of flexural yielding in plastic hinge regions of R/C members. The shear sub-element interacts throughout the analysis with the flexural sub-element, in the location of the plastic hinge regions, in order to capture gradual spread of inelastic shear deformations as well as degradation of shear strength with curvature ductility demand based on an analytical procedure proposed herein. The skeleton curves and hysteretic behaviour in all three deformation mechanisms are determined on the basis of analytical procedures and hysteretic models found to match adequately the experimental
results. Empirical formulae are proposed for the shear distortion at onset of stirrup yielding and onset of shear failure. The proposed element is implemented in the general finite element code for damage analysis of R/C structures IDARC and is validated against experimental results involving R/C column and frame specimens failing in shear subsequent to yielding in flexure. It is shown that the model can capture well the hysteretic response and predict reliably the type of failure of these specimens.
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- Three-Dimensional Analysis of Masonry Vaults Using Limit State Analyis With Finite Friction
- D.F. D'Ayala ; E. Tomasoni
- Book Title / Journal: International Journal of Architectural Heritage
- Year: 2011 , Volume: 2 , Series: 5
- Structure types ; Masonry Structures
- Keywords: vaults ; pavillion vaults ; Friction ; limit analysis ; Masonry Structures
- Description
- Within the past 20 years, a growing number of methods for the analysis of masonry vaults have been developed. However, most methods idealize the vaults as a system of many arches. This oversimplification could be admissible for barrel vaults and spherical domes under simple gravitational loads, but it cannot do justice to the three-dimensional effects developing 10 in other types of vaults, especially in complex vaults without smooth and continuous surface.
Moreover, although the results could be conservative for uniform load distributions, this model limits substantially the set of loading conditions that can be analyzed and hence
provide an accurate assessment of vaults performance. To clear this limitation, this article proposes a tool for three-dimensional analysis of masonry vaults. Using the lower bound 15 approach and taking into account the friction among block interfaces, the proposed analytical method may give a good indication of the actual surface of thrust within the framework of limit state analysis. Therefore, limit state analysis with finite friction is able to provide the crack pattern, the stress resultants and the horizontal thrust at the supports, important elements with regard to strengthening interventions. To show its simplicity and rigor, the procedure has been applied to pavilion vaults. The results obtained are validated by comparison with nonlinear finite element analysis and an application to a real case study is presented.
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- Constitutive models for the material nonlinear analysis of concrete structures including time-dependent effects
- A. Ventura-Gouveia ;
- Book Title / Journal: Ph.D Thesis, Universidade do Minho Escola de Engenharia
- Year: 2011 , Volume: , Series:
- Structure types ; Concrete structures
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- Development of a pedestrian bridge with GFRP profiles and fibre reinforced self-compacting concrete deck
- M. Taheri ; J. Sena-Cruz ; J.A.O. Barros ; P.J.D. Mendes
- Book Title / Journal: Composite Structures, 93, 11, 2969-2982
- Year: 2011 , Volume: , Series:
- Structure types ; Composite structures
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- Numerical analysis of concrete block masonry beams under three point bending
- P.B. Lourenço ; G. Vasconcelos ; V.G. Haach
- Book Title / Journal: Engineering Structures, 33, 12, 3226-3237
- Year: 2011 , Volume: , Series:
- Structure types ; Masonry Structures
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- The development of a simplified modeling technique for the finite element analysis of reinforced masonry shear walls
- M.I. Abdellatef
- Book Title / Journal: M.Sc. Thesis
- Year: 2011 , Volume: , Series:
- Structure types ; Masonry Structures
- Keywords: shear walls ; Finite element analysis ; Masonry Structures
- Description
- Reinforced masonry shear walls are structural elements that are commonly used in construction. It is important to properly model their contribution to the strength and stiffness of the structures in which they appear. Analysts typically represent these shear walls with deep beam elements within building models. However, the assumption that a shear wall behaves as a deep beam breaks down when shear failure occurs, and cracking starts to dominate the behavior of the wall. There is a need to develop a finite element model of these shear walls that is accurate but simple enough to be included as a part of a full building model.
A 2-D masonry shear wall model was developed to meet these requirements. To make it
applicable within standard structural analysis software, the model does not require a detailed
representation of each component of the wall separately. Instead, the reinforcing is smeared and
overlaid with a plane stress masonry element. Plasticity is assumed for the steel and
cracking/damage is assumed for the masonry. Reductions in masonry stiffness were applied to
account for initial cracks, and artificial damping was added to stabilize the solution process after the
occurrence of masonry damage.
Data from two experimental test programs were used to verify the proposed modeling technique along with comparisons with detailed finite element models. It was found that the behavior of the simplified models was quite close to that of the detailed finite element models for all cases considered. When compared to the peak values of cyclic load of the experimental specimens, it was found that initial stiffness, peak load, and displacement at final failure were well predicted although, for short shear walls which are dominated by shear failure of the masonry, damage did not evolve as rapidly in the finite element models as was observed in the experimental specimens. The proposed modeling technique was therefore shown to reasonably predict reinforced masonry shear wall behavior, even with coarse meshing and smeared steel reinforcement, regardless of the wall aspect ratio, amount of axial vertical load applied to the wall, and reinforcement ratio.
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- The AISC 2010 Seismic Provisions for Composite Structures: Towards an Application of PBD Principles for Connection Design.
- R. Leon ; J.W. Hu
- Proceedings of the Ninth Pacific Conference on Earthquake Engineering Building an Earthquake-Resilient Society, Auckland, New Zealand, Paper 241.)
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Structure types ; Composite structures
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- The Influence of Permanent Expanded Polystyrene Formwork on Fire Resistance of Self-Compacting and Normal Vibrated Concretes.
- S. Bakhtiyari ; M. and Rais-Ghasemi
- Asian Journal of Civil Engineering (Building and Housing), Vol. 12, No. 3, pages 353-374.
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Structure types ; Composite structures
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- Processing and properties of recycled aggregate concrete
- HyunGu Jeong
- M. Sc Thesis, Civil & Environmental Eng. Dep., University of Illinois at Urbana-Champaign, Urbana, Illinois
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Structure types ; Concrete structures
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- Factors affecting bond between new and old concrete
- P.M.D Santos ; E.N.B.S. Julio
- ACI Material Journal, Vol. 108, No.4, Pages 449-456.
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Structure types ; Concrete structures
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- Vibration characteristics of concrete-steel composite floor structures
- S.D. Silva ; D. P. Thambiratnam
- ACI Structural Journal, Vol. 80, Issue 6, pages 706-714.
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Structure types ; Composite structures
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- Experimental investigation on the behaviour of concrete-filled steel columns
- P. Gajalakshmi ; H. Jane ; R.S. Raghavan
- Asian Journal of Civil Engineering (Building and Housing), Vol. 12, No. 6, pages 691-701.
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Structure types ; Composite structures
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- Application of polypropylene nonwoven fabrics for cement composites reinforcement
- H. Pakravan ; M. Jamshidi ; M. Latifi ; M. Neshastehriz
- Asian Journal of Civil Engineering (Building and Housing), Vol. 12, No. 5, pages 551-562.
- Book Title / Journal:
- Year: 2011 , Volume: , Series:
- Structure types ; Composite structures
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