Hygroscapes: Innovative Shape Shifting Façades

Abdelmohsen, Sherif; Adriaenssens, Sigrid; Gabriele, Stefano; Olivieri, Luigi; El-Dabaa, Rana

doi:10.1007/978-3-030-03676-8_26

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…With natural wood, sample thickness is typically shown to affect motion response. Previous studies show that thicker wooden samples demonstrate lower angles of curvature with slow speed rate of response (Abdelmohsen et al, 2019b;El-Dabaa et al, 2020a). Natural wood, however, has a uniform thickness for the whole sample and is not a parameter that can be controlled or regulated.…”

Section: Controlled Printed Hygroscopic Parametersmentioning

confidence: 99%

“…Longer samples tend to have higher deflection value and response speed. In this paper, 1:3 dimensional ratio was used as a base for the experiments, as it was demonstrated in earlier studies that it exhibits fairly higher deflection with angle of curvature 368 than ratio 1:2 with 288 and 1:1 sample ratio with 208 (Abdelmohsen et al, 2019b), while samples with more than 1:4 ratio with 0.3 mm are fragile.…”

Section: D Printing Of Wooden Actuatorsmentioning

confidence: 99%

“…Researchers revealed that several aspects increase the angle of deflection and speed as a tangential cut of wood with grain orientation parallel to the short side of the sample, dimensional ratio of the samples (Abdelmohsen et al, 2019b) and type of wood as hardwood has faster response and more deflection value than softwood (Abdelmohsen et al, 2019c). In addition, results show that the thicker the wood is, the least deflection value and speed response it achieved (El-Dabaa et al, 2020b).…”

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confidence: 99%

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4D printing of wooden actuators: encoding FDM wooden filaments for architectural responsive skins

El-Dabaa

Salem

2021

OHI

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PurposeConventional motion mechanisms in adaptive skins require rigid kinematic mechanical systems that require sensors and actuation devices, hence impeding the adoption of zero-energy buildings. This paper aims to exploit wooden responsive actuators as a passive approach for adaptive facades with dynamic shading configurations. Wooden passive actuators are introduced as a passive responsive mechanism with zero-energy consumption.Design/methodology/approachThe study encodes the embedded hygroscopic parameters of wood through 4D printing of wooden composites as a responsive wooden actuator. Several physical experiments focus on controlling the printed hygroscopic parameters based on the effect of 3D printing grain patterns and infill height on the wooden angle of curvature when exposed to variation in humidity. The printed hygroscopic parameters are applied on two types of wooden actuators with difference in the saturation percentage of wood in the wooden filaments specifically 20% and 40% for more control on the angle of curvature and response behavior.FindingsThe study presents the ability to print wooden grain patterns that result in single and double curved surfaces. Also, printing actuators with variation in infill height control each part of wooden actuator to response separately in a controlled passive behavior. The results show a passive programmed self-actuated mechanism that can enhance responsive façade design with zero-energy consumption through utilizing both material science and additive manufacturing mechanisms.Originality/valueThe study presents a set of controlled printed hygroscopic parameters that stretch the limits in controlling the response of printed wood to humidity instead of the typical natural properties of wood.

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Section: Controlled Printed Hygroscopic Parametersmentioning

confidence: 99%

Section: D Printing Of Wooden Actuatorsmentioning

confidence: 99%

mentioning

confidence: 99%

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4D printing of wooden actuators: encoding FDM wooden filaments for architectural responsive skins

El-Dabaa

Salem

2021

OHI

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“…Various innovative approaches have been explored over the last decades to design building skins with multifunctional characteristics. These approaches include the integration of functional material components into the skin designs such as hygroscopic building materials Simonson et al (2004), Holstov et al (2015), Abdelmohsen et al (2019), spectrally selective glazing (Kim et al, 2017), or spectrally selective coatings (Liang et al, 2019b), and the use of dynamic façades (Attia et al, 2018; Gehbauer et al, 2020; Karanouh and Kerber, 2015; Yi and Kim, 2021). In the area of dynamic façades, Khadra and Chalfoun (2014) developed a double-layer, South-facing façade that consisted of a layer facing the interior of the building and another layer facing the exterior.…”

Section: Introductionmentioning

confidence: 99%

Modeling and design optimization of shape memory alloy-enabled building skins for adaptive ventilation

Fang

Hernandez

2022

Journal of Intelligent Material Systems and Structures

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This paper presents a modeling and design study of shape memory alloy (SMA)-based skins that enable adaptive ventilation in buildings. The skins are formed by panels with attached SMA wires and can be periodically arranged to form a building envelope. When the environmental temperature is below the SMA austenitic transformation temperatures, the SMA wires are relaxed and the panel forms a closed surface, preventing circulation of exterior airflow into the building. When the environmental temperature exceeds such SMA transformation temperatures, the SMA wires contract and bend the panel to create an opening that enables circulation of airflow into the building. The response of the adaptive skins is evaluated through a thermomechanically coupled finite element model. The applied thermal loads are determined from published field measurements. Metallic materials and fiber-reinforced composites are explored as candidates for the panel. Genetic algorithms are employed for optimization, where the objective is that the panel exhibits a large opening when the environmental temperature exceeds a prescribed ideal temperature and stays closed otherwise. Optimization results show that two-layered composite panels with ply angles of 45°/−45° and thicknesses of 0.1/0.25 mm (layers ordered from the interior to the exterior side) display the most favorable performance.

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Encoding Latent Properties of Hygromorphic-Thermobimetal Composites as a Passive Mechanism for Adaptive Building Skins

El-Dabaa

Abdelmohsen

Mansour

2020

Architecture and Urbanism: A Smart Outlook

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Hygroscapes: Innovative Shape Shifting Façades

Cited by 7 publications

References 9 publications

4D printing of wooden actuators: encoding FDM wooden filaments for architectural responsive skins

4D printing of wooden actuators: encoding FDM wooden filaments for architectural responsive skins

Modeling and design optimization of shape memory alloy-enabled building skins for adaptive ventilation

Encoding Latent Properties of Hygromorphic-Thermobimetal Composites as a Passive Mechanism for Adaptive Building Skins

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