Influence of simultaneous multi-axial ground excitation and a compliant base on the response of a non-structural component with multiple supports

Lim, Ellys; Chouw, Nawawi

doi:10.1016/j.engstruct.2018.07.096

Cited by 3 publications

(4 citation statements)

References 19 publications

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“…Uplift of structures under dynamic loads has been widely studied since the 1960s (e.g., 32, 33), Lim and Chouw, 2 Chen et al 34 . The results showed that the fundamental frequency of the soil‐structure system has a significant effect on the duration and amplitude of the uplift, and thus on the contact forces between the ground and the foundation.…”

Section: Resultsmentioning

confidence: 99%

“…Because of this restriction in obtaining the sand-surface position, the authors focus on the footing behaviour. Uplift of structures under dynamic loads has been widely studied since the 1960s (e.g., 32, 33), Lim and Chouw, 2 Chen et al 34 The results showed that the fundamental frequency of the soil-structure system has a significant effect on the duration and amplitude of the uplift, and thus on the contact forces between the ground and the foundation. However, there are scarce experimental works available addressing uplift of shallow foundations on soil.…”

Section: Relationship Between Uplift and Settlement Of Footingmentioning

confidence: 99%

“…In this study, the fundamental frequency is considered instead of the fundamental period considering their direct relationship, 𝑓 = 1∕𝑇. An estimation of the fundamental frequency of the soil-structure system was obtained from Equation (2).…”

Section: Dynamic Propertiesmentioning

confidence: 99%

“…Until the second half of the 20th century, it was commonly assumed that ignoring soil‐structure interaction (SSI) by assuming a fixed‐base condition will lead to conservative designs. However, SSI effects can be detrimental, depending on the ground motion properties, the soil and the structure (e.g., 2, 3). A further progression in the SSI research domain is a consideration of closely adjacent structures.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of the seismic response of a structure set amongst closely adjacent structures

Barrios

Larkin

Chouw

2021

Earthq Engng Struct Dyn

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The influence of soil on the dynamic response of soil-structure systems is usually studied on a stand-alone (SA) structure, even though closely adjacent structures form the vast majority of the population, especially in large cities. When structures are closely adjacent to each other, the wavefield in the soil, generated by the vibration of the footings, produces a complex interaction between them. Scant attention, especially by physical experiments, has been paid to this interaction. This work addresses the seismic response of a single degree-of-freedom structure (structure of focus) considering the influence of one and two closely adjacent neighbours. Experiments were performed using a large laminar box filled with sand sitting on a shake table. Results from utilising four recorded ground motions from the 2010-2011 Canterbury earthquake sequence are analysed. The effect of adjacent structures on the acceleration and displacement of the top mass of each structure, as well as the uplift of the footings, are discussed. Changes in the fundamental frequency due to the presence of neighbouring structures are identified. The use of the SA system, without consideration of closely adjacent structures, may result in a significant error in the estimation of the response of the structure of focus. In general, acceleration, lateral displacement and uplift reduced in comparison with that of the corresponding SA case. A footing settlement mechanism, resulting from uplift of the system that reflects the influence of adjacent structures, is also revealed.

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Section: Resultsmentioning

confidence: 99%

Section: Relationship Between Uplift and Settlement Of Footingmentioning

confidence: 99%

Section: Dynamic Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental study of the seismic response of a structure set amongst closely adjacent structures

Barrios

Larkin

Chouw

2021

Earthq Engng Struct Dyn

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Dynamics of bridge structures

Chouw

2022

Innovative Bridge Design Handbook

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Influence of Transient and Partial Footing Separation on the Seismic Response of Skewed Bridges with Soil Support

Yang

Kun

Meng

et al. 2021

Int. J. Str. Stab. Dyn.

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Previous research has shown that the transient and partial footing separation is one of the effective methods to reduce the impact of earthquakes on bridge structures. The separation will not only temporarily stop the transfer of seismic load to structures, but also activate rigid-like body motions of the bridge piers. Most of current investigations involving footing uplift only focused on straight bridges. The influence of skew angle is rarely considered. Even though skewed bridges are common and more vulnerable to seismic load. This work reveals the simultaneous influence of skew angle and footing uplift on soil on seismic response of bridges. A bridge with a 30∘ or 45∘ skew angle, in addition to a straight bridge, was excited using a large-scale shake table. The ground excitations were stochastically simulated based on design spectrum of New Zealand standard. The result revealed that with increasing skew angle bridges will have frequent footing uplifts. In the case of a straight bridge, although allowing footing uplift is beneficial in reducing the bending moment at the pier support, it increases the longitudinal girder displacement. In contrast, in the case of 30∘ and 45∘ skewed bridges, uplifts increase the bending moments of piers and the displacements of the girder, especially in the transverse direction.

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Influence of simultaneous multi-axial ground excitation and a compliant base on the response of a non-structural component with multiple supports

Cited by 3 publications

References 19 publications

Experimental study of the seismic response of a structure set amongst closely adjacent structures

Experimental study of the seismic response of a structure set amongst closely adjacent structures

Dynamics of bridge structures

Influence of Transient and Partial Footing Separation on the Seismic Response of Skewed Bridges with Soil Support

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