Shake Table Study on the Effect of Mainshock-Aftershock Sequences on Structures with SFSI

Qin, Xiaoyang; Chouw, Nawawi

doi:10.1155/2017/9850915

Cited by 11 publications

(6 citation statements)

References 15 publications

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“…All the tests were performed using a large laminar box (2 m x 2 m x 2 m) and a shake table at the University of Auckland's Test Hall. Details of the laminar box's design and function can be found in Qin and Chouw 28 …”

Section: Experimental Methodologymentioning

confidence: 99%

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: Experimental Methodologymentioning

confidence: 99%

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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“…To investigate the influence of the soil support, a 2 m × 2 m laminar box was used (Qin and Chouw, 2017). It consists of steel frames and 30 aluminium layers with the ability to move freely in the horizontal direction up to 175 mm.…”

Section: Experimental Set-upmentioning

confidence: 99%

Effect of pier height and support flexibility on seismic response of bridges including poundings

Yang

Meng

Chouw

2022

Advances in Structural Engineering

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In conventional seismic design, bridges usually are assumed to be fixed to a rigid support. This assumption, however, does not correspond to the reality of bridges with shallow footings since they can rock in strong earthquakes. It has been recognised that several factors significantly affect the response of bridges with rocking footings, including support flexibility, pier height and pounding. Most studies so far have mainly focused on a single factor. This research aims to narrow the knowledge gap by investigating the combined effect of pier height, support condition and earthquake characteristics on bridges with rocking ability. A series of shake table experiments on a single-frame bridge with different pier heights and support conditions under hard, medium and soft soil excitations were carried out. The influence of support flexibility was examined by comparing the response of rocking bridges on rigid support with that on soil support. The result shows that regardless of the flexibility of the support, in the case of no pounding, it is beneficial to take rocking footing into account because the maximum bending moment at the pier support can be reduced. However, when pounding was considered, the combined effect can generate an even larger maximum bending moment than that of the fixed-base bridge.

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“…The maximum permitted displacement of each layer of the laminar box is 175 mm in the direction of the shake table motion. More information regarding the characteristics of the box can be found in [17]. The box is filled to a height of 1.43 m with sand with an average density of 1.58 t/m 3 .…”

Section: Laminar Boxmentioning

confidence: 99%

Impact of Seismic Uplift and Soil Support on the Acceleration Distribution of a Liquid Storage Tank

Hernandez‐Hernandez¹,

Larkin²,

Chouw³

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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A rigid base is assumed in most seismic studies of liquid storage tanks. Additionally, recent studies have shown that permitting uplift can significantly reduce the damage to tanks. Uplift is the transient partial separation of the tank base from the supporting foundation. However, uplift of storage tanks is still not well studied and a rigid base is assumed in numerical studies. In this work, the simultaneous effect of uplift and a soil foundation are utilised to evaluate experimentally the effect of these two factors on the acceleration in the tank wall. A low-density polyethylene tank and a shake table were employed. Stochastically generated seismic excitation is employed based on the New Zealand design standard, NZS 1170.5, for medium soil, classification B. Three base conditions were considered: 1) fixed-base tank on a rigid support, 2) freebase tank on a rigid support and 3) free-base tank on a flexible support. To simulate the rigid support condition, the tank is resting on a steel plate rigidly attached to the shake table. A laminar box infilled with sand is utilised to represent a flexible soil condition. Results revealed that the highest acceleration at the tank top occurred when the tank is resting freely on a rigid supporting base. Furthermore, for this case the maximum uplift occurred at the same time as the maximum acceleration. However, for the case of a flexible support, the maximum acceleration occurred at the tank base and did not coincide with the time of maximum uplift. The maximum uplift occurred for a flexible supporting base and is not related to the maximum acceleration at the tank top. Thus, the distribution of the maximum acceleration, and hence uplift, depends significantly on the support condition.

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Shake Table Study on the Effect of Mainshock-Aftershock Sequences on Structures with SFSI

Cited by 11 publications

References 15 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

Effect of pier height and support flexibility on seismic response of bridges including poundings

Impact of Seismic Uplift and Soil Support on the Acceleration Distribution of a Liquid Storage Tank

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