Mechanical properties of sandwich panels constructed from polystyrene/cement mixed cores and thin cement sheet facings

Tabatabaiefar, Hamid Reza; Mansoury, Bita; Zand, Mohammad Javad Khadivi; Potter, Daniel

doi:10.1177/1099636215621871

Cited by 26 publications

(9 citation statements)

References 20 publications

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“…In this method, the nonlinear backbone curves and trial and error were used to obtain the strain-compatible values of soil damping and shear modulus. The detailed steps of this method can be found in Tabatabaiefar et al (2013), Fatahi and Tabatabaiefar (2014) and Tabatabaiefar et al (2017). Sun et al (1998) investigated cyclic shear strain (γ c ) depended shear modulus and damping ratio (ξ) of cohesive soils and provided backbone curves recommended for seismic site-response assessments.…”

Section: Soil Modelmentioning

confidence: 99%

Effects of dynamic soil-structure interaction on seismic behaviour of high-rise buildings

Xiao-feng

Far

2021

Bull Earthquake Eng

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It is conventional to assume that the role of the soil-structure interaction (SSI) is beneficial to the buildings under seismic loading. However, lessons learned from recent earthquakes revealed that this assumption could be misleading, and SSI may have different effects on the seismic response of different structural systems. In this study, an enhanced soil-structure numerical model is developed and verified using ABAQUS software to assess the impact of SSI on high-rise frame-core tube structures. The seismic responses of 20, 30, and 40-storey buildings constructed on soil class Ee (according to Australian Standards) under four earthquake acceleration records have been studied. The results in terms of maximum lateral deflections, foundation rocking, inter-storey drifts and storey shear forces for the rigid base and flexible base frame-core tube structures have been discussed and compared.Generally, SSI has a remarkable impact on the seismic behaviour of high-rise frame-core tube structures since it can increase the lateral deflections and inter-storey drifts and decrease storey shear forces of structures. However, It is worth noting that the seismic responses of soil-structure systems under near and far field earthquakes are considerably different.

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Section: Soil Modelmentioning

confidence: 99%

Effects of dynamic soil-structure interaction on seismic behaviour of high-rise buildings

Xiao-feng

Far

2021

Bull Earthquake Eng

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“…In fact, the use of ductility factors permits the maximum deformations to be expressed in nondimensional terms as indices of inelastic deformation for seismic design and analysis. 26 Various methods have been presented by different studies 25,[27][28][29][30][31] to estimate the maximum and yield displacements based on the pushover test results. In this study, according to Park (1988), 25 the yield displacement is determined based on the equivalent elasto-plastic curve with the same elastic stiffness and ultimate load as the real F I G U R E 8 Failure mode of the walls under compressive lateral loads F I G U R E 7 Data acquisition system used in the experimental study structure.…”

Section: Resultsmentioning

confidence: 99%

Experimental investigation on in‐plane lateral stiffness and degree of ductility of composite PVC reinforced concrete walls

Far

Nejadi

Aghayarzadeh

2021

Structural Concrete

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This study investigates the in-plane lateral stiffness and ductility of composite PVC encased concrete walls subject to the lateral loads using pushover tests to determine lateral strength and ductility characteristics of composite PVC encased walls filled with plain concrete, macro-synthetic fiber reinforced concrete (RC), and steel RC. Eighteen concrete wall specimens were cast and subjected to pushover test to determine the load-deflection curves. Based on the capacity curves resulting from the pushover tests, the yield and maximum displacements and subsequently structural ductility and performance factors according to Australian Standard for seismic design of buildings have been determined. The determined parameters as well as the initial and effective lateral stiffness values measured from the load-deflection curves for all three cases were compared and the final findings have been discussed. Based on the outcomes of this study, it has become apparent that the tested composite PVC encased macro-synthetic fiber RC walls can exhibit superior performance in terms of ductility when compared to the unreinforced concrete specimens. In addition, the results indicated that the initial in-plane lateral stiffness values of the tested composite PVC encased macro-synthetic fiber RC walls increased by 25% compared to the tested walls filled with plain concrete. In order to enable structural designers to design composite PVC encased concrete walls, ductility factors for this type of walls have been extracted from the test results for the three mentioned cases and proposed for practical applications. It has been concluded that all the PVC encased concrete walls evaluated in this study can be categorized as fully ductile structures.

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“…In the present work we simulate the realization of a drone after the replacement of the laminate of the supporting structure of the rotors (made up of only carbon fiber and epoxy resin) with a sandwich consisting of a polystyrene core (center) and a skin made of carbon fiber and epoxy resin; the two laminates will be compared both as regards the weight and the mechanical performances obtained. The use of polystyrene has already been studied either as the core of a sandwich or doped with other elements such as carbon nanotubes [24][25][26]. The drone considered in this work is the marketed DJI S900, a hexacopter with six arms that support the six rotors.…”

Section: The Drone Structurementioning

confidence: 99%

Designing drones by combining finite element and atomistic simulations: a didactic approach

Raffaele,

Caccamo,

Castorina

et al. 2020

Preprint

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A didactic multiscale approach for drone modeling is proposed. Specifically, we investigate the drone structure at both macroscopic and microscopic scales, by making use of finite element and atomistic simulations, respectively. The structural analysis is performed with the aim to equip the drone with specific sensors and measuring instruments capable to detect the existence of volcanic ash, SO 2 , CO 2 and other pollutants in the atmosphere after a vulcanic eruption. We show that, by modeling the tubular structure of the drone with a sandwich constituted by a a polystyrene core, carbon fiber skins and epoxy matrix, a weight saving of 7 grams for each drone arm can be obtained, in comparison to the standard commercial drones, although a slight worsening of the mechanical performances is observed. In addition, the molecular structure of the polystyrene chains has been investigated by using atomistic Molecular Dynamics simulations, providing further information on the local structure of the polymer chains. Additional improvements of the weight saving could be obtained by means of the the topological optimization techniques on the body of the drone and on the supports for landing.

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Mechanical properties of sandwich panels constructed from polystyrene/cement mixed cores and thin cement sheet facings

Cited by 26 publications

References 20 publications

Effects of dynamic soil-structure interaction on seismic behaviour of high-rise buildings

Effects of dynamic soil-structure interaction on seismic behaviour of high-rise buildings

Experimental investigation on in‐plane lateral stiffness and degree of ductility of composite PVC reinforced concrete walls

Designing drones by combining finite element and atomistic simulations: a didactic approach

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