Cyclic lateral load behavior of squat reinforced concrete walls

Terzioglu, Tevfik; Orakçal, Kutay; Massone, Leonardo M.

doi:10.1016/j.engstruct.2018.01.024

Cited by 63 publications

(20 citation statements)

References 3 publications

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“…The force-deformation relations (capacity curves on Figure 12) for the structural elements and acceptance criteria for the performance requirements were defined in accordance with Eurocode 8-3 [44], but considered also the guidelines provided by National Institute of Standards and Technology (NIST) [46][47][48], Federal Emergency Management Agency (FEMA) [49][50][51][52] and ASCE [45] for the derivation of the cyclic backbone curves. Furthermore, guidelines [53] and scientific papers presenting the experimental testing of walls (e.g., [54][55][56][57]) were considered for squat walls, because of the unreliability of their failure mechanisms and ductility calculation. Large structural redundancy causes significant robustness, although failure mechanisms of primary elements are mostly non-ductile shear failures, which was taken into account during analyses.…”

Section: Numerical Models and Analysis Methodsmentioning

confidence: 99%

Seismic Performance Assessment of an Existing RC Wall Building with Irregular Geometry: A Case-Study of a Hospital in Croatia

et al. 2020

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Buildings of strategic importance should be able to resist seismic forces in accordance with potential earthquakes that may occur at the location and remain fully operational afterwards. However, many of them were constructed before the modern principles of seismic design were known (especially regarding detailing and ductility), and therefore may be considered substandard. The first step in mitigating the seismic risk of such structures is to assess their seismic performance and, in particular, to identify their structural deficiencies. This study presents a comprehensive methodology for the seismic performance assessment of individual buildings, applied to an existing reinforced concrete (RC) hospital. This building is of an irregular layout, constructed as a structural wall system, and it is located in the seismically active region of Croatia. It includes the assessment of seismic hazards on the location, ambient noise measurements, experimental determination of structural modal parameters, creation of a detailed numerical model calibrated with experimental data, and a seismic performance assessment using various analysis methods. As a result, the building collapse mechanisms were determined and critical structural elements identified, which is the basis for future actions directed to the reduction of its risk (e.g., applications of specific measures for a target retrofit, proposal of evacuation routes and safe places inside the building, etc.).

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Section: Numerical Models and Analysis Methodsmentioning

confidence: 99%

Seismic Performance Assessment of an Existing RC Wall Building with Irregular Geometry: A Case-Study of a Hospital in Croatia

et al. 2020

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“…Therefore, the baseline formulation of the SFI-MVLEM is used to simulate the behavior of the four medium-rise or relatively slender planar RC walls (aspect ratios ranging from 1.5 to 3.0) subjected to in-plane cyclic lateral loading (RW2, Thomsen and Wallace 1995;R2, Oesterle et al 1976;WSH6, Dazio et al 2009; RW-A15-P10-S78, Tran and Wallace 2015). The SFI-MVLEM-SQ is validated against test results obtained for three squat walls (aspect ratios equal to 0.33, 0.50, and 1.0), also tested under in-plane cyclic lateral loading (T5-S1, T2-S3, and T4-S1; Terzioglu et al 2018). The SFI-MVLEM-3D is verified against experimental data for two flanged (T-shaped, U-shaped) slender walls subjected to both uni-and multi-directional lateral loading (TW2, Thomsen and Wallace 1995;TUB, Beyer et al 2008).…”

Section: Description Of Test Specimens and Testing Proceduresmentioning

confidence: 99%

“…Accuracy of the SFI-MVLEM-SQ is evaluated using experimental results obtained from three planar squat specimens tested by Terzioglu et al (2018): (1) T5-S1 with aspect ratio of 1.0, (2) T2-S3 with aspect ratio of 0.5, and (3) T4-S1 with aspect ratio of 0.33. All three specimens experienced significant shear deformations contributing up to 35%, 75%, and 80% to the top lateral displacement of the walls, respectively, and failed in diagonal compression under combined shear and flexural effects.…”

Section: Validation Of Sfi-mvlem-sqmentioning

confidence: 99%

Shear–flexure-interaction models for planar and flanged reinforced concrete walls

Kolozvari

Kalbasi

Orakçal

et al. 2019

Bull Earthquake Eng

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This paper presents information on development, calibration, and validation of three companion macroscopic modeling approaches for nonlinear analysis of reinforced concrete (RC) structural walls, including: (1) the baseline two-dimensional two-node formulation of the Shear-Flexure-Interaction Multiple-Vertical-Line-Element-Model (SFI-MVLEM), (2) extension of the baseline SFI-MVLEM for modeling of squat walls (SFI-MVLEM-SQ), and (3) extension of the baseline SFI-MVLEM to a three-dimensional four-node element for simulation of non-planar RC walls under multi-directional loading (SFI-MVLEM-3D). The models are implemented in the computational platform OpenSees. Models presented are calibrated and validated against experimental results obtained from tests on RC wall specimens that cover a wide range of physical and behavioral characteristics, including: (1) one slender, two moderately-slender and one medium-rise planar RC walls tested under inplane loading used for validation of the baseline SFI-MVLEM, (2) three squat planar RC wall specimens tested under in-plane loading used for validation of the SFI-MVLEM-SQ, and (3) one T-shaped and one U-shaped RC wall specimen tested under unidirectional and multi-directional loading, respectively, used for validation of SFI-MVLEM-3D. The comprehensive comparisons between analytically-obtained and experimentally-measured wall responses suggest that the analytical models proposed can accurately simulate both global and local wall responses, within their range of applicability. The models capture load-displacement response features of the walls, including lateral load capacity, lateral stiffness, cyclic stiffness degradation, and pinching characteristics, as well as nonlinear shear deformations and their coupling with flexural deformations during cyclic loading. Comparisons between experimental and analytical results at local response levels suggest that the models can also replicate distributions and magnitudes of wall vertical strains and curvatures at various locations. Overall, the analytical models presented provide robust and reliable tools for nonlinear analysis of RC walls, with a wide range of applicability.

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“…[ 1 ] Properly designed and detailed structural walls possess the necessary strength, stiffness, and ductility characteristics to ensure life‐safety performance in a building subjected to a design‐level earthquake and to minimize damage on the structure during a service‐level earthquake. [ 2 ] Since the late 1980s, it has been common to use concrete walls with rectangular cross‐sections to optimize economy and design. Much more attentions have been paid to performance study of rectangular RC shear wall too.…”

Section: Introductionmentioning

confidence: 99%

Seismic behavior of flanged reinforced concrete shear walls with high‐strength stirrup under cyclic loading

Zhang

Junxiong

Zhang

2021

Structural Design Tall Build

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Summary Twelve half‐scale flanged reinforced concrete (RC) shear wall specimens with high‐strength stirrup were tested to failure under cyclic loading. The effects of axial load ratio, aspect ratio, and web confinement on seismic performances were critically examined. All specimens showed an expected flexural‐dominant behavior, with the crushing of the compressed concrete and the buckling of reinforcement at the boundary elements. The axial load ratio was found to have significant effects to the seismic behavior of the shear walls. Higher loading capacity and lower ductility capacity can be achieved with increases in the axial load ratio. The hysteretic curves of the walls were all unsymmetrical, especially in T‐shaped walls. The specimens showed higher strength and stiffness, but lower ductility capacity when the web was in compression. The use of high‐strength stirrups can effetely confine the compressed concrete and postpone bucking of longitudinal rebars in the free web boundary, thus preventing premature failure when web was in compression. The plastic deformation capacity of all the test specimens was all excellent, and the ultimate drift ratio of all specimens greatly exceeded the allowable inter‐story drift ratio value (1/120) of RC shear wall in accordance with the design provisions of Chinese GB50011‐2010 code.

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Cyclic lateral load behavior of squat reinforced concrete walls

Cited by 63 publications

References 3 publications

Seismic Performance Assessment of an Existing RC Wall Building with Irregular Geometry: A Case-Study of a Hospital in Croatia

Seismic Performance Assessment of an Existing RC Wall Building with Irregular Geometry: A Case-Study of a Hospital in Croatia

Shear–flexure-interaction models for planar and flanged reinforced concrete walls

Seismic behavior of flanged reinforced concrete shear walls with high‐strength stirrup under cyclic loading

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