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This article analyses 1.36 million realistic soil-structure interaction (SSI) scenarios in a systematic fashion to define the correlation between soil, structural, and system parameters and interaction effects on the structural response.... more
This article analyses 1.36 million realistic soil-structure interaction (SSI) scenarios in a systematic fashion to define the correlation between soil, structural, and system parameters and interaction effects on the structural response. In the analyses, a soil-shallow foundation-structure model that satisfies design building code requirements is utilized. It has been identified that soil shear wave velocity, shear wave velocity degradation ratio, structure-to-soil stiffness ratio, and structural aspect ratio combined with the system stiffness are the key parameters whose variation significantly affects variation in structural response. The critical range of variation of these parameters resulting in a detrimental SSI effects is also defined.
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A shake-table investigation is conducted on a 40% scale model frame-wall system to validate the concept of rocking walls as primary seismic systems. The rocking wall concept was implemented on confined masonry walls, but the findings can... more
A shake-table investigation is conducted on a 40% scale model frame-wall system to validate the concept of rocking walls as primary seismic systems. The rocking wall concept was implemented on confined masonry walls, but the findings can be extended to any rocking wall system. As the inherent damping of this system is low, a pair of supplemental steel hysteretic energy dissipating dampers is used at the base of the wall. It is concluded that with careful detailing, damage is not only eliminated but the structure re-centers itself following a large earthquake.
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This article highlights soil-structure interaction (SSI) effects on the seismic structural response accounting for uncertainties in the model parameters and input ground motions. A probabilistic Monte Carlo methodology was used to conduct... more
This article highlights soil-structure interaction (SSI) effects on the seismic structural response accounting for uncertainties in the model parameters and input ground motions. A probabilistic Monte Carlo methodology was used to conduct approximately six million dynamic time-history simulations using an established rheological soil-shallow foundation-structure model. Considering the results yields outcomes that contradict prevailing views of the always beneficial role of SSI. In other words, the likelihood of having amplification in structural response due to SSI is large enough that it cannot be readily ignored. This research provides a significant first step towards reliability-based seismic design procedures incorporating foundation flexibility.
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The seismic performance of a test structure fitted with semi-active resetable devices is experimentally investigated. Shaking table tests are conducted on a ⅕th scale four-storey building using 27 earthquake records at different intensity... more
The seismic performance of a test structure fitted with semi-active resetable devices is experimentally investigated. Shaking table tests are conducted on a ⅕th scale four-storey building using 27 earthquake records at different intensity scalings. Different resetable device control laws result in unique hysteretic responses from the devices and thus the structure. This device adaptability enables manipulation or sculpting of the overall hysteresis response of the structure to address specific structural cases and types. The response metrics are presented as maximum 3rd floor acceleration and displacement, and the total base shear. The devices reduce all the response metrics compared with the uncontrolled case and a fail-safe surrogate. Cumulative probability functions allow comparison between different control laws and additionally allow tradeoffs in design to be rapidly assessed. Ease of changing the control law in real-time during an earthquake record further improves the adaptability of the system to obtain the optimum device response for the input motion and structural type. The findings are an important step to realizing full-scale structural control with customized semi-active hysteretic behaviour using these novel resetable device designs. Copyright © 2008 John Wiley & Sons, Ltd.
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Uncertainties involved in the characterization and seismic response of soil–foundation–structure systems along with the inherent randomness of the earthquake ground motion result in very complex (and often controversial) effects of... more
Uncertainties involved in the characterization and seismic response of soil–foundation–structure systems along with the inherent randomness of the earthquake ground motion result in very complex (and often controversial) effects of soil–foundation–structure interaction (SFSI) on the seismic response of structures. Conventionally, SFSI effects have been considered beneficial (reducing the structural response), however, recent evidence from strong earthquakes has highlighted the possibility of detrimental effects or increase in the structural response due to SFSI. This paper investigates the effects of SFSI on seismic response of structures through a robust Monte Carlo simulation using a wide range of realistic SFS systems and earthquake input motions in time-history analyses. The results from a total of 1.36 million analyses are used to rigorously quantify the SFSI effects on structural distortion and total horizontal displacement of the structure, and to identify conditions (system properties and earthquake motion characteristics) under which SFSI increases the structural response.
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The Earthquake Engineering Online Archive. Seismic behaviour of bridges on isolating bearings. Tan, Fun Kwai; Cooke, Nigel; Moss, Peter J.; Carr, Athol J. Research Report 86/13, University of Canterbury, Department of Civil ...
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... While most books published in the past few decades in the rapidly developing field of seismic engineering have not been able to avoid obsolescence, two by Professor Paulay have become classics. ... REFLECTIONS BY ATHOL CARR. ...
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The effects of diaphragm mass distribution are investigated for building pounding. Elastic diaphragm-to-diaphragm collisions are explained by considering the total momentum over the length of each diaphragm at three critical instants... more
The effects of diaphragm mass distribution are investigated for building pounding. Elastic diaphragm-to-diaphragm collisions are explained by considering the total momentum over the length of each diaphragm at three critical instants during collision. Expressions for ...
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The effects of various structural parameters and ground motion characteristics on the seismic response of base-isolated multistory structures are investigated. Results are used to develop two simplified analysis methods for practical... more
The effects of various structural parameters and ground motion characteristics on the seismic response of base-isolated multistory structures are investigated. Results are used to develop two simplified analysis methods for practical design. The first method, which is called the ...
The Behavior of Bearings Used for Seismic Isolation under Shear and Axial Load. [Earthquake Spectra 15, 199 (1999)]. Atsushi Mori, Peter J. Moss, Nigel Cooke, Athol J. Carr. Abstract. The investigation described in this paper ...
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WSPC Journals Online,WorldSciNet.
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The Earthquake Engineering Online Archive. A Refined Finite Element Analysis of Thin Shells Including Dynamic Loadings. Carr, Athol J. UCB/SESM-1967/09, Dept. of Civil Engineering, University of California, Berkeley, 1967-06, 224 pages... more
The Earthquake Engineering Online Archive. A Refined Finite Element Analysis of Thin Shells Including Dynamic Loadings. Carr, Athol J. UCB/SESM-1967/09, Dept. of Civil Engineering, University of California, Berkeley, 1967-06, 224 pages (555/C266/1967). ...
Two identical small scale six storey three dimensional reinforced concrete framed structures were constructed consisting of columns, beams and floor slabs. Each structure had a single bay in each direction and was approximately one fifth... more
Two identical small scale six storey three dimensional reinforced concrete framed structures were constructed consisting of columns, beams and floor slabs. Each structure had a single bay in each direction and was approximately one fifth of full size. All members were designed ...
This paper describes an experimental programme in which two one-storey single-bay specimens were tested under cyclic lateral loading. The first specimen was designed according to the normal practice for framed masonry structures, whereas... more
This paper describes an experimental programme in which two one-storey single-bay specimens were tested under cyclic lateral loading. The first specimen was designed according to the normal practice for framed masonry structures, whereas new reinforcing details were provided in ...
Finite Element Analysis of Orthogonally Stiffened Annular Sector Plates. [Journal of Engineering Mechanics 115, 2074 (1989)]. Alavandi Bhimaraddi, Peter J. Moss, Athol J. Carr. Abstract. The finite element analysis of an orthogonally ...
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WSPC Journals Online,WorldSciNet.
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