Impact of Axial Load on the Seismic Response of Rectangular Walls

SHEGAY, Alex; Motter, Christopher J.; Elwood, Kenneth J.; Henry, Richard; Lehman, Dawn E.; Lowes, Laura N.

doi:10.1061/(asce)st.1943-541x.0002122

Cited by 33 publications

(16 citation statements)

References 10 publications

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“…Results of testing four ductile RC walls under increasing axial load ratio [11] combined with results from a database of previously tested walls in literature showed that deformation capacity (expressed as curvature ductility, ) was found to decrease with increasing axial load. For walls subjected to axial load ratios of 20% or higher, curvature ductility capacity was below 16, the deformation demand limit in NZS 3101:2006-A3 for ductile walls.…”

Section: Axial Load Limits and Deformation Demand Limitsmentioning

confidence: 91%

“…Testing of four RC walls designed with ductile detailing and subjected to a range of axial load ratios. [11,12] Assess effect of end region and web region reinforcement detailing on wall ductility.…”

Section: The Mbie Wall Projectsmentioning

confidence: 99%

“…Variation of hoops, cross-ties, end region confinement length and inclusion of ties in the web region of the wall in the above-noted four RC wall tests. [11,12] Investigate the suitability of wall deformation demand and capacity limits with respect to reinforcement detailing and loading demands.…”

Section: The Mbie Wall Projectsmentioning

confidence: 99%

“…Factors in addition to axial load were identified to affect the curvature ductility capacity of ductile walls, including longitudinal reinforcement ratio, wall geometry and transverse reinforcement detailing in the wall end region. To differentiate between these parameters, the deformation capacity from a collected database of ductile walls (including the four walls tested in [11]) are plotted in Figure 8a against their neutral axis to wall length ratio, / , and sorted by the vertical spacing of transverse hoops to longitudinal bar diameter ratio, / . Typically, design deformation demand limits (such as the limits in NZS 3101:2006-A3) should be representative of the lower-bound capacity of experimental data.…”

Section: Axial Load Limits and Deformation Demand Limitsmentioning

confidence: 99%

“…Cross-sections of walls with (a) confinement length shorter than neutral axis length and no cross-ties on web longitudinal reinforcement; (b) fully confined neutral axis length and cross-ties on web longitudinal reinforcement. Damage to hoop and cross-tie confinement in the tested ductile walls[11].…”

mentioning

confidence: 99%

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Research Programme on Seismic Performance of Reinforced Concrete Walls: Key Recommendations

SHEGAY

Dashti

Hogan

et al. 2020

BNZSEE

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A wide range of reinforced concrete (RC) wall performance was observed following the 2010/2011 Canterbury earthquakes, with most walls performing as expected, but some exhibiting undesirable and unexpected damage and failure characteristics. A comprehensive research programme, funded by the Building Performance Branch of the New Zealand Ministry of Business, Innovation and Employment, and involving both numerical and experimental studies, was developed to investigate the unexpected damage observed in the earthquakes and provide recommendations for the design and assessment procedures for RC walls. In particular, the studies focused on the performance of lightly reinforced walls; precast walls and connections; ductile walls; walls subjected to bi-directional loading; and walls prone to out-of-plane instability. This paper summarises each research programme and provides practical recommendations for the design and assessment of RC walls based on key findings, including recommended changes to NZS 3101 and the NZ Seismic Assessment Guidelines.

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Section: Axial Load Limits and Deformation Demand Limitsmentioning

confidence: 91%

Section: The Mbie Wall Projectsmentioning

confidence: 99%

Section: The Mbie Wall Projectsmentioning

confidence: 99%

Section: Axial Load Limits and Deformation Demand Limitsmentioning

confidence: 99%

mentioning

confidence: 99%

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Research Programme on Seismic Performance of Reinforced Concrete Walls: Key Recommendations

SHEGAY

Dashti

Hogan

et al. 2020

BNZSEE

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Deformation limits of L‐shaped reinforced concrete shear walls: Experiment and evaluation

Han

Chen

et al. 2019

Structural Design Tall Build

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Summary L‐shaped reinforced concrete (RC) shear walls have been studied over the years due to their importance in tall buildings. However, few investigations focus on the progression of damage with increasing deformation, especially on the deformation limits for different performance levels. Hence, an experiment was conducted on 12 L‐shaped RC shear walls subjected to axial and cyclic lateral loadings. The variables were shear span ratio, axial load ratio, and longitudinal boundary element reinforcement ratio. The seismic performances were analyzed and discussed in terms of crack pattern, failure mode, hysteretic response, backbone envelope, and ductility factor. On the basis of the three key performance state points on the backbone envelope, a method was proposed to assess the seismic performances of L‐shaped RC shear walls using six distinct performance levels. These performance levels were provided with relevant deformation limits and proved to be in good agreement with six significative damage states. Further, comparative analysis showed that the deformation limits derived from experiments were significantly underestimated by current codes and methods available in literature, because these prediction models were mainly developed for rectangular shear walls. Considering the contribution of flange, a modification of Cui's method yields good estimations of deformation limits for L‐shaped RC shear walls.

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A parametric investigation on applicability of the curved shell finite element model to nonlinear response prediction of planar RC walls

Dashti

Dhakal

Pampanin

2019

Bull Earthquake Eng

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This study investigates the ability of a finite element model based on curved shell element formulation in predicting nonlinear behavior of planar RC structural walls, identifying the strengths and limitations of this modeling approach. For this purpose, a parametric validation is conducted in addition to verification of the model simulation against experimental results of several wall specimens tested in literature. The effects of variations in total length, thickness, shear-span ratio, axial load ratio, confinement, as well as the horizontal and vertical reinforcement ratios are investigated at both global and local levels. For scrutinizing the global response, lateral load versus total, flexural and shear deformation predictions are used. For local response, sensitivity of the stress and strain distributions throughout the length and height of the wall models to the parameters noted above is evaluated. The capabilities and deficiencies of the modelling approach are discussed in detail in light of the numerical versus experimental as well as parametric verifications. The model is found to be able to predict most of the experimentally observed failure mechanisms of rectangular walls including global out-of-plane instability under in-plane loading, concrete crushing at the base, diagonal tension and diagonal compression as well as sliding shear. The model is not able to represent bar buckling, bar fracture and the potential subsequent secondary failure modes such as instability of the compression boundary zone due to progressive asymmetric concrete crushing at the base. The parametric study indicated sensitivity of the model response to the variation of the parameters known to be influential on the nonlinear response of planar RC walls.

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Impact of Axial Load on the Seismic Response of Rectangular Walls

Cited by 33 publications

References 10 publications

Research Programme on Seismic Performance of Reinforced Concrete Walls: Key Recommendations

Research Programme on Seismic Performance of Reinforced Concrete Walls: Key Recommendations

Deformation limits of L‐shaped reinforced concrete shear walls: Experiment and evaluation

A parametric investigation on applicability of the curved shell finite element model to nonlinear response prediction of planar RC walls

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