Interaction of Shear Walls and Frames

Khan, Fazlur R.; Sbarounis, John A.

doi:10.1061/jsdeag.0001091

Cited by 73 publications

(6 citation statements)

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“…This type of model aims to account for both bending and shear deformations, and they were proposed to consider that lateral deformation in buildings is due to a combination of both flexural and shear deformations 25 . It has been shown that using only shear‐building models may result in significant errors when estimating the dynamic response of building structures, 26,27 and it is worth to note that this has also been the case in structures where the main lateral force resisting system is based on shear walls 28 …”

Section: Experimental Validationmentioning

confidence: 99%

Lower bound of structural damage to achieve practical identifiability of nonlinear models in seismic structural health monitoring

Hernandez,

Erazo

2023

Earthq Engng Struct Dyn

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This paper examines the effect of structural damage on the practical/computational identifiability of the parameters that define nonlinear models of building structures subjected to earthquake‐induced base motions. The objective is to determine the level of physical damage expected to successfully estimate the nonlinear parameters of restoring force models. For this purpose, the analyses aim to determine if the parameters that define a hysteretic (Bouc‐Wen type) model can be identified within a predefined level of accuracy from accelerations measured during seismic events that cause minor damage. The identified model is then interrogated to determine if it can provide accurate predictions of the response and damage level experienced during strong ground motions that cause moderate‐to‐severe damage. The damage model adopted is a Park–Ang type model and the unscented Kalman filter is used for parameter estimation. The results are verified using simulated two‐dimensional building models and validated using experimental data from a large‐scale shake table test.

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Section: Experimental Validationmentioning

confidence: 99%

Lower bound of structural damage to achieve practical identifiability of nonlinear models in seismic structural health monitoring

Hernandez,

Erazo

2023

Earthq Engng Struct Dyn

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“…As higher-mode effects are identified as a significant design challenge for tall and slender structures, substantial studies have been conducted to systematically investigate the contribution of higher-mode effects in structures with various boundary conditions, by adapting modal analysis tools, [27][28][29][30] or by developing closed-form solutions by simplifying the structures using a continuum beam analogy. 10,[31][32][33][34] Results of these studies demonstrated that the dynamic response of tall and slender structures can be directly controlled by varying the degree of rotational and translational fixities at their bases-while limiting the base rotational fixity can effectively reduce the first-mode response, limiting the base translational fixity is more effective in mitigating the higher-mode responses. This suggested the possibility of utilizing a basemechanism that limits the overall dynamic response of the superstructure by controlling both the overturning moment (i.e., rotational fixity) and shear (i.e., translational fixity) demands at the structure's base.…”

Section: Mitigating Higher-mode Effects Using Base-mechanismsmentioning

confidence: 99%

Shear‐controlling rocking‐isolation podium system for enhanced resilience of high‐rise buildings

Zhong

Christopoulos

2022

Earthq Engng Struct Dyn

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Rapid urban growth has been paired with a rapid increase in the demand for high‐rise buildings, and has accelerated the need for developing more resilient high‐rise buildings in earthquake‐prone regions. Current best practices for the seismic design of high‐rise buildings follow a performance‐based design approach that allows the designer to use innovative structural systems, select performance objectives, and verify seismic performances targeted at multiple levels of seismic intensity. As shortcomings in conventional code‐designed high‐rise buildings continue to be revealed by strong earthquakes, the importance of more resilient high‐rise systems is increasingly evident. Several high‐performance systems have been proposed to limit the excessive seismic demands attributed to higher‐mode effects in high‐rise buildings. However, these systems still face design challenges associated with distributed damage and residual deformations. This paper proposes a novel self‐centering base mechanism for high‐rise buildings that independently limits both shear forces and overturning moments at the base to mitigate higher‐mode effects, while eliminating residual deformations and controlling concentrated stresses within the structure that otherwise would need to be designed for. The schematic overview of the proposed system is first introduced, followed by the detailed design of a physical embodiment developed based on a reference 42‐story RC core wall building. Results of a numerical case‐study comparison confirm that an enhanced seismic performance is achieved through the proposed system with minimum damage and negligible residual deformations even following major seismic loading. The proposed system, with further investigations, also has the potential to be applied to a wider range of structural systems.

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“…The links represent the slabs that horizontally connect RC walls and frames; the links are treated as rigid members because of the extremely high in-plane stiffness of the slabs. CSFCBM was first proposed by Khan and Sbarounis (1964) to evaluate the interaction between walls and frames in multi-story buildings. The model was later used to identify approximate responses of multi-story buildings, such as lateral displacements and shear forces in walls, under various lateral load distributions (Heidebrecht and Smith 1973;Smith et al 1981Smith et al , 1984.…”

Section: Csfcbmmentioning

confidence: 99%

Simplified procedure for rapidly estimating inelastic responses of numerous high-rise buildings with reinforced concrete shear walls

Suwansaya

Warnitchai

2022

Preprint

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Nonlinear response history analysis (NLRHA) is considered the most accurate procedure for evaluating the seismic performance of high-rise buildings. However, it requires considerable expertise and a significant amount of analysis time, making it inappropriate for evaluating numerous high-rise buildings; for example, estimating the seismic losses of a city for an earthquake scenario. To overcome this limitation, a simplified procedure developed based on the uncoupled modal response history analysis (UMRHA) and coupled shear-flexural cantilever beam model (CSFCBM) is proposed. The underlying assumption is that the UMRHA procedure can compute the nonlinear seismic responses mode-by-mode, where each vibration mode is assumed to behave as a single-degree-of-freedom system. The nonlinear seismic responses are approximately represented by the sum of the modal responses of a few vibration modes. However, UMRHA requires knowledge of the modal properties and modal hysteretic behaviors. Therefore, the CSFCBM is introduced here to estimate the required modal properties and modal hysteretic behaviors. The inelastic seismic demands of the building can be determined using the UMRHA procedure with the computed modal properties obtained by CSFCBM. The accuracy of this proposed procedure is verified considering four high-rise buildings of 19, 30, 34, and 45 stories with reinforced concrete shear walls. The inelastic demands computed by the NLRHA procedure are used as a benchmark and compared with those of the proposed procedure. The results indicate that the proposed procedure provides reasonably accurate demand estimations for all case study buildings with significantly less analysis time than that required by NLRHA.

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Interaction of Shear Walls and Frames

Cited by 73 publications

References 0 publications

Lower bound of structural damage to achieve practical identifiability of nonlinear models in seismic structural health monitoring

Lower bound of structural damage to achieve practical identifiability of nonlinear models in seismic structural health monitoring

Shear‐controlling rocking‐isolation podium system for enhanced resilience of high‐rise buildings

Simplified procedure for rapidly estimating inelastic responses of numerous high-rise buildings with reinforced concrete shear walls

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