Quasi-static cyclic tests and plastic hinge analysis of RC structural walls

Dazio, Alessandro; Beyer, Katrin; Bachmann, Hugo

doi:10.1016/j.engstruct.2009.02.018

Cited by 224 publications

(157 citation statements)

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“…The factors that are reported to influence L p are: the moment gradient along the member, the depth of the section, the hardening of reinforcement steel, the inclination of the shear-flexure cracks at the plastic hinge region, the penetration of reinforcement bar strains into neighboring elastic regions, the axial load acting on the member, the section shape and the loading direction (see e.g. Priestley and Park, 1987;Zahn, 1986;Hines, 2002;Fardis and Biskinis, 2003;Beyer, 2007;Dazio et al, 2009a).…”

Section: Displacement-based Element Models: Db Dt Dfmentioning

confidence: 99%

The use of post-earthquake residual displacements as a performance indicator in seismic assessment

Yazgan

Dazio

2011

Georisk: Assessment and Management of Risk for Engineered Syste

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PrefaceModern performance based earthquake engineering addresses design, evaluation, construction, maintenance and decommission of structures and requires that their performance during an earthquake can be predicted with a known degree of accuracy. In this framework the importance of residual displacements is twofold: On one hand they represent a significant source of damage affecting mainly the serviceability and the repairability of the structure. On the other hand, after an earthquake, residual displacements are often the only measurable indicator of the shaking occurred during the earthquake. In the framework of a pre-earthquake design or assessment process, the expected residual displacements need to be predicted; while during a post-earthquake assessment the actual residual displacements can be measured.Within his present doctoral dissertation, Mr. Yazgan developed and validated against experimental evidence a new and original methodology to improve the estimate of maximum deformations occurred during an earthquake taking into account both observable damage and measurable residual displacements. The methodology is based on the Bayesian probabilistic theory and, as a particular novelty, explicitly considers model error. To estimate model error Mr. Yazgan carried out a very extensive study on the numerical modelling of structures under earthquake, which also allowed the formulation of practical modelling recommendations. The quantification of model error is of course of fundamental importance also for any realistic pre-earthquake prediction of residual displacements.The thorough and comprehensive work presented by Mr. Yazgan allows a deep understanding of the challenges relevant to the use of residual displacements in the seismic performance assessment of structures and his developments represent a new effective way to achieve this important goal. Zurich, January 2010Dr. Alessandro Dazio SummarySafety assessment of damaged structures is a pivotal part of the post-earthquake recovery process. As a result of the deformation histories that have occurred during the damaging earthquake, the key structural properties of the columns, beams and walls that contribute to the seismic resistance change. The key structural properties include stiffness, strength and deformation capacity. An accurate estimation of the residual key structural properties is crucial in identifying vulnerability of the damaged structure.These residual structural properties are known to be strongly dependent on the maximum deformations that have occurred. A new post-earthquake assessment method is developed following this premise. After an earthquake, the maximum deformations experienced by a damaged structure can be estimated using the developed method.The essential idea behind the method is to probabilistically estimate the experienced maximum deformations based on the post-earthquake residual displacements and the visible structural damage. The major uncertainties related to the estimated maximum deformations are explicitly treated in the me...

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Section: Displacement-based Element Models: Db Dt Dfmentioning

confidence: 99%

The use of post-earthquake residual displacements as a performance indicator in seismic assessment

Yazgan

Dazio

2011

Georisk: Assessment and Management of Risk for Engineered Syste

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“…In order to investigate the contribution of the shear displacements to the total displacement, the shear to flexural displacements ratio (D s /D f ) is generally used as an indicator. This ratio was found to be constant over the inelastic range for flexure-controlled walls [2,6,22,24].…”

Section: Shear To Flexural Displacements Ratiosmentioning

confidence: 99%

Behaviour of U-shaped RC walls under quasi-static cyclic diagonal loading

Constantin

Beyer

2016

Engineering Structures

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a b s t r a c tThis article presents results from the experimental testing of two half-scale RC U-shaped walls under quasi-static cyclic bi-directional loading along the diagonal direction of the U-shaped section, which were recently completed at EPFL. The main objective of the article is to emphasise particularities in the behaviour of U-shaped walls under diagonal loading and to point out related design and analysis issues. Several phenomena specific to diagonal loading are discussed: (1) strain gradient across the wall width promotes out-of-plane buckling of the boundary elements in the flange ends; (2) plane section analysis does not yield reliable moment capacity estimates for the diagonal loading direction and (3) under diagonal loading the compression depth in the flange end boundary elements is larger than for the other loading directions, exposing unconfined concrete to large compressive strains. These phenomena lead to a reconsideration of the following design and analysis issues for U-shaped walls: (a) the distribution of the vertical reinforcement layout; (b) the use of plane section analysis for estimating the strength capacity of the wall; (c) the confinement length of the boundary elements of the flanges; and (d) the assessment of the out-of-plane stability of flange ends.

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“…For completeness, and in order to briefly demonstrate the advantages brought about by the use of the proposed formulation, one case study of a RC wall tested by Dazio et al [9] is discussed in the next paragraphs. The experimental results are compared both in terms of global (forcedisplacement) and local (curvature profiles) quantities, against numerical results from models employing DB/ae, DB/c and FB elements.…”

Section: State Determination and Comparison With Existing Formulationsmentioning

confidence: 99%

“…Different flexural and confining reinforcement were provided to the web and boundary element region which are detailed in Dazio et al [9]. A sketch of the RC walls and an example of a finite element (FE) mesh and sectional discretization used in the comparisons are illustrated in Figure 2 while the employed material properties are reported in Table 1.…”

Section: State Determination and Comparison With Existing Formulationsmentioning

confidence: 99%

“…Two models for classical and axially equilibrated displacementbased formulations are also included in the comparison, featuring one and two finite elements per structural member and four Gauss-Lobatto integration sections within each FE. For the cases where the structural member is discretized with two finite elements, the length of the base element is selected as the height of the plastic zone Lpz, defined in Dazio et al [9] as the height at which the plastic curvature profile is equal to the yield curvature Sectional discretization (adapted from [5]). The experimental and numerical force-displacement responses for all the models discussed above are compared in Figure 3.…”

Section: State Determination and Comparison With Existing Formulationsmentioning

confidence: 99%

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Axially Equilibrated Displacement-Based Beam Element: Implementation in Opensees and Application to Dynamic Analysis of Structures

Tarquini¹,

Almeida²,

Beyer³

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Quasi-static cyclic tests and plastic hinge analysis of RC structural walls

Cited by 224 publications

References 4 publications

The use of post-earthquake residual displacements as a performance indicator in seismic assessment

The use of post-earthquake residual displacements as a performance indicator in seismic assessment

Behaviour of U-shaped RC walls under quasi-static cyclic diagonal loading

Axially Equilibrated Displacement-Based Beam Element: Implementation in Opensees and Application to Dynamic Analysis of Structures

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