Cyclic Testing of Reinforced Concrete Walls with Distributed Minimum Vertical Reinforcement

Lu, Yufeng; Henry, Richard; Gultom, Ronald J.; Quincy, Tsun Ming

doi:10.1061/(asce)st.1943-541x.0001723

Cited by 54 publications

(44 citation statements)

References 16 publications

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“…This type of mechanism in cast in-situ walls has been heavily researched, particularly following observations of damage in RC walls after the 2011 Christchurch earthquake, and found to result in quite poor seismic performance (e.g. [24][25][26]). However, in precast walls with a grout tube connection, it seems that the grout has poorer inelastic bond strength properties compared to in-situ concrete and as such, much greater yield penetration occurs prior to bar fracturing.…”

Section: Vertical Bar Fracturing Failures -Specimens P09 P15 P16 Anmentioning

confidence: 99%

Experimental Testing of Nonductile Reinforced Concrete Wall Boundary Elements

Menegon¹,

Wilson²,

Lam³

et al. 2019

ACI Structural Journal

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interests include the design and experimental assessment of RC walls and the collapse behaviour of non-ductile RC buildings in lower seismic regions. ABSTRACT This paper presents an overview and results of a recent experimental testing program of nonductile reinforced concrete (RC) wall boundary elements. The experimental program consisted of seventeen boundary element prism specimens that are meant to represent the end regions of non-ductile RC walls. The failure mechanisms of interest were global out-of-plane buckling and local bar buckling of the vertical reinforcement. The matrix of test specimens included:high and low slenderness ratios (i.e. high-to-thickness ratio); cast in-situ and precast wall construction methods; and specimens that were detailed with either a single central layer of vertical reinforcement or two layers of vertical reinforcement, one per face. Strain-rate affects were also assessed in the experimental program. The paper is concluded with a detailed discussion of the test results, comparisons with similar experimental programs and design models in literature and guidance on tensile strain limits for the displacement-based design of non-ductile RC walls.

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Section: Vertical Bar Fracturing Failures -Specimens P09 P15 P16 Anmentioning

confidence: 99%

Experimental Testing of Nonductile Reinforced Concrete Wall Boundary Elements

Menegon¹,

Wilson²,

Lam³

et al. 2019

ACI Structural Journal

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“…Numerical modelling of full-scale lightly reinforced walls [28] showed that the discrete cracking pattern was similar to the scaled wall tests. Due to a larger wall length in full-scale walls, for any given wall rotation larger strains are induced at the crack locations compared with the scaled test walls, as explained in Lu et al [38]. Consequently, full-scaled walls will have a reduced plastic rotation capacity and, by association, a reduced interstorey drift capacity.…”

Section: Minimum Vertical Reinforcementmentioning

confidence: 98%

“…Numerical modelling of walls to investigate a wider range of design parameters and to compare requirements in different design standards. [28,30,31,38] Recommend improvements to minimum longitudinal reinforcement criteria for NZS 3101:2006-A3 [46].…”

Section: The Mbie Wall Projectsmentioning

confidence: 99%

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

SHEGAY

Dashti

Hogan

et al. 2020

BNZSEE

Self Cite

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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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“…Such walls consist of two perpendicular wall segments, leading to significant stiffness and strength in both directions, which are contributed to the resistance of action induced by earthquake ground motions. Unlike conventional rectangular shear walls, the seismic behaviors of which have been thoroughly investigated by a significant number of experiments and finite element models, the seismic performances of L‐shaped RC shear walls are rarely available in literature. Zhang et al developed a cumulative damage model verified by the experiments of six L‐shaped shear walls.…”

Section: Introductionmentioning

confidence: 99%

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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Cyclic Testing of Reinforced Concrete Walls with Distributed Minimum Vertical Reinforcement

Cited by 54 publications

References 16 publications

Experimental Testing of Nonductile Reinforced Concrete Wall Boundary Elements

Experimental Testing of Nonductile Reinforced Concrete Wall Boundary Elements

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

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

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