Effective stiffness of concrete shear walls based on statistical analysis

Sharifi, Mahdi; Shafieian, Morteza

doi:10.1002/suco.201600202

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…Li and Xiang [20] suggested a formulation for assessing the effective stiffness of RC squat structural walls by performing a comprehensive parametric study. A similar study was discussed in Sharifi and Shafieian [21], who proposed a formulation to de-termine the effective stiffness of slender and squat walls, based on statistical analyses of 154 existing experiments available in literature. Kolozvari et al [22] developed an analytical model able to capture the interaction between axial/flexural and shear responses for RC walls subjected to reversed-cyclic, based on a two-dimensional fiber-based macroscopic model, and the experimental calibration and validation of this analytical wall model was also carried out [23].…”

Section: Evaluation Of Residual Capacitymentioning

confidence: 88%

Numerical Investigations on the Residual Capacity and Economic Losses of Earthquake-Damaged Reinforced Concrete Wall Structures

Ceccarelli¹,

Bianchi²,

Pedone³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The substantial damage to Reinforced Concrete (RC) structural walls observed from postearthquake reconnaissance has prompted the attention on the need for improved code-based design provisions for these structural elements as well as for detailed investigations on their residual capacity, typically neglected in the retrofit/repair evaluation. Although several research works and international guidelines focusing on the seismic performance of damaged structural walls are available from a state-of-the-art review, a specific methodology to evaluate the earthquake-related damage to structural walls is still missing in literature. Therefore, this research work investigates the seismic residual capacity of RC walls through parametric numerical analyses, aiming to provide indications on the assessment methodology to be used in practical applications. The numerical investigation is initially carried out by implementing Finite Element Modelling of RC walls with different mechanical properties and expected failure mechanisms. This allows to evaluate and collect stiffness/strength reduction coefficients to be adopted for different post-earthquake damage conditions. Then, the influence of residual capacity on the economic seismic losses of wall structures is investigated and discussed. Specifically, a multi-story case-study RC building is selected, and pre-and post-earthquake loss assessments are carried out considering alternative wall typologies and damage levels. Analytical-based nonlinear analyses highlight that the loss of stiffness and strength can lead to increasingly higher economic losses depending on the damage level of the structural wall. Moreover, substantial economic losses can be estimated if residual capacity is taken into account even at low-intensity seismic levels. Therefore, such methodology could provide valuable information to support decisions on the post-earthquake repair/retrofit/demolition.

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Section: Evaluation Of Residual Capacitymentioning

confidence: 88%

Numerical Investigations on the Residual Capacity and Economic Losses of Earthquake-Damaged Reinforced Concrete Wall Structures

Ceccarelli¹,

Bianchi²,

Pedone³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…Kwon and Ghannoum [9] examined the accuracy of the lateral stiffness provisions of international standards for concrete buildings. Sharifi and Shafieian [10] proposed relations to determine the effective stiffness based on statistical analyses on slender and squat walls. Linear regression analyses are applied to determine the relationship between effective stiffness parameters such as axial load, reinforcement ratio, and aspect ratio.…”

Section: Introductionmentioning

confidence: 99%

Effective flexural stiffness for reinforced concrete shear walls having confined boundary elements

Foroughi¹,

Yüksel²

2021

JSEAM

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In the design of reinforced concrete (RC) shear walls strength, ductility and effective stiffness of the elements must be taken into account and are important parameters in terms of structural safety. Accurate estimation of the ductility and effective stiffnesses of RC members has always been an attractive subject of study as it provides a reliable estimate of the capacity of buildings under seismic loads. In this study, RC shear wall models with different concrete strength, longitudinal and transverse reinforcement ratios were designed to investigate effective section stiffness and coefficients. The effective stiffness of the cracked section in the RC shear walls designed in different parameters were analytically obtained. Analytically investigated parameters were calculated from TBEC (2018), ACI318 (2014), ASCE/SEI41 (2017) and Eurocode8 (2004, 2005) regulations and nonlinear behaviors. The results obtained according to different design parameters were compared and examined. In the relations suggested for the effective section stiffness coefficient, the confining effect is not taken into account as in the regulations. Therefore, it means neglecting the effects of parameters such as concrete strength, confining effect and axial load levels acting on the section. This situation can lead to unrealistic results in the design and evaluation of RC elements. For this reason, determining the moment-curvature relationship in the design and evaluation of RC elements and obtaining effective section stiffness values are of great importance in order to obtain more realistic results.

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A simplified tri-linear model for monolithic exterior shear keys failing in sliding shear

Birrell,

Astroza,

Murcia-Delso

et al. 2024

Structures

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Effective stiffness of concrete shear walls based on statistical analysis

Cited by 5 publications

References 16 publications

Numerical Investigations on the Residual Capacity and Economic Losses of Earthquake-Damaged Reinforced Concrete Wall Structures

Numerical Investigations on the Residual Capacity and Economic Losses of Earthquake-Damaged Reinforced Concrete Wall Structures

Effective flexural stiffness for reinforced concrete shear walls having confined boundary elements

A simplified tri-linear model for monolithic exterior shear keys failing in sliding shear

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