Performance-based seismic design and assessment of rocking timber buildings equipped with inerters

Thiers-Moggia, R.; Mariotti, C.

doi:10.1016/j.engstruct.2021.113164

Cited by 19 publications

(6 citation statements)

References 57 publications

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“…On the other hand, rocking structures are capable of uplifting and sustaining a strong nonlinear motion, while limiting the development of base moments since they are not fixed to the foundation or the ground (Thiers-Moggia and Málaga-Chuquitaype, 2021). It has been proposed that this uplift can act as a sort of rocking isolation for both bridges and buildings (Bachmann et al, 2019; Thiers-Moggia and Málaga-Chuquitaype, 2020; Vassiliou et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Physics-informed artificial intelligence models for the seismic response prediction of rocking structures

Shen,

Málaga-Chuquitaype

2024

DCE

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The seismic response of a wide variety of structures, from small but irreplaceable museum exhibits to large bridge systems, is characterized by rocking. In addition, rocking motion is increasingly being used as a seismic protective strategy to limit the amount of seismic actions (moments) developed at the base of structures. However, rocking is a highly nonlinear phenomenon governed by non-smooth dynamic phases that make its prediction difficult. This study presents an alternative approach to rocking estimation based on a physics-informed convolutional neural network (PICNN). By training a group of PICNNs using limited datasets obtained from numerical simulations and encoding the known physics into the PICNNs, important predictive benefits are obtained relieving difficulties associated with over-fitting and minimizing the requirement for a large training database. Two models are created depending on the validation of the deep PICNN: the first model assumes that state variables including rotations and angular velocities are available, while the second model is useful when only acceleration measurements are known. The analysis is initiated by implementing K-means clustering. This is followed by a detailed statistical assessment and a comparative analysis of the response-histories of a rocking block. It is observed that the deep PICNN is capable of effectively estimating the seismic rocking response history when the rigid block does not overturn.

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Section: Introductionmentioning

confidence: 99%

Physics-informed artificial intelligence models for the seismic response prediction of rocking structures

Shen,

Málaga-Chuquitaype

2024

DCE

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“…Nonlinear deformations of PT walls are mostly derived from the gap opening at rocking interfaces, and the rocking mechanism helps to avoid plastic hinges that usually occur in traditional shear walls and induce irreparable damage and large residual deformations associated with reinforcement yielding or buckling, concrete cracking or crushing, etc. In order to improve the inherently low energy dissipation of single rocking walls, a lot of research focused on PT walls supplemented with energy‐dissipating devices such as mild steel reinforcement 14,15 and various dampers 16–19 . Besides, several constructional measures, like the usage of steel armouring 18 and replaceable toes, 20 have been proposed and validated to be effective to minimize or avoid the noticeable damage at wall toes due to highly localized compression.…”

Section: Introductionmentioning

confidence: 99%

“…In order to improve the inherently low energy dissipation of single rocking walls, a lot of research focused on PT walls supplemented with energy-dissipating devices such as mild steel reinforcement 14,15 and various dampers. [16][17][18][19] Besides, several constructional measures, like the usage of steel armouring 18 and replaceable toes, 20 have been proposed and validated to be effective to minimize or avoid the noticeable damage at wall toes due to highly localized compression. Different structural configurations of PT walls have also been developed for wider practice, including but not limited to PT perforated walls, 21 PT coupled walls, 22,23 and PT walls with end columns.…”

Section: Introductionmentioning

confidence: 99%

Shaking table test of a 10‐story self‐centering tube building

Song

Zhou

2023

Earthq Engng Struct Dyn

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The severe damage of conventionally designed buildings and consequent socioeconomic impacts after major seismic events have spurred the development of self‐centering systems with high seismic resilience. Post‐tensioned (PT) walls with rocking interfaces allowed to open and close and unbonded PT bars that provide most of the re‐centering ability have been developed extensively as a promising self‐centering technology. Aiming at providing essential insights into the seismic performance of self‐centering tube systems, a 1/6‐scale ten‐story self‐centering tube building was designed, constructed, and tested on a shaking table subjected to a series of unidirectional and bidirectional ground motions with increasing intensities. The test building consisted of a self‐centering tube that included four PT walls and provided the primary lateral force resistance in both directions, a perimeter rocking frame that was designed mainly to carry gravity loads, and particular connections with slots to accommodate the potential displacement incompatibility among the PT walls and surrounding components. The experimental results indicated the excellent seismic performance of the test building that had reliable structural integrity and experienced only confined damage even when subjected to extremely high intensities. The building also exhibited satisfactory re‐centering ability with minimal residual deformations at the conclusion of testing. It was demonstrated that the self‐centering tube system is a desirable low‐damage alternative to traditional tube systems in earthquake‐prone regions. The benchmark data from this test provided unique suggestions and support for further research on the design methods, numerical modeling, and experimental testing of self‐centering tube systems.

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“…With this design option, the amount of rotation would be very limited. The second kind of control is the use of energy dissipation devices (Figure 1D), such as the base‐plate‐yielding rocking systems, 15 the replaceable reinforcing steel bars in short length, 16 the dampers 17–19 or the inerters 20–24 . The third kind is the combined use of the prestressing cables and energy dissipation devices, such as the combination of cables with the dampers, 25 the energy dissipation bars, 26 the steel sleeve, 27,28 or the O‐shaped connectors 29,30 …”

Section: Introductionmentioning

confidence: 99%

“…The second kind of control is the use of energy dissipation devices (Figure 1D), such as the base-plate-yielding rocking systems, 15 the replaceable reinforcing steel bars in short length, 16 the dampers [17][18][19] or the inerters. [20][21][22][23][24] The third kind is the combined use of the prestressing cables and energy dissipation devices, such as the combination of cables with the dampers, 25 the energy dissipation bars, 26 the steel sleeve, 27,28 or the O-shaped connectors. 29,30 A structure which has been facilitated to experience large rotational motion as a whole body is referred herein as the 'rocking block'.…”

Section: Introductionmentioning

confidence: 99%

Seismic protection by rocking with superelastic tendon restraint

Tsang

Lam

2022

Earthq Engng Struct Dyn

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This article introduces an innovative system for enhancing the seismic performance of a structure through facilitating large rotational (rocking) motion to occur without risking overturning. The innovation of this study is in the use of tendons consisting of Nickel‐Titanium (superelastic) alloy connected in series with steel to impose partial restraints to the structure when experiencing rocking motion. Importantly, the large rotational motion is fully recoverable. Existing installations which can be made to rock may also be retrofitted with the device for improving its seismic resistance. The original contributions of the article are the derivation, and experimental validation, of an analytical model for simulating the seismic performance of a system that has been fitted with the restraining device. In a parametric study employing the newly developed modelling techniques, major trends in the seismic response behaviour of the structure have been identified.

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Performance-based seismic design and assessment of rocking timber buildings equipped with inerters

Cited by 19 publications

References 57 publications

Physics-informed artificial intelligence models for the seismic response prediction of rocking structures

Physics-informed artificial intelligence models for the seismic response prediction of rocking structures

Shaking table test of a 10‐story self‐centering tube building

Seismic protection by rocking with superelastic tendon restraint

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