Design Aspects of a Deployable Tensegrity-Hollow-rope Footbridge

Rhode-Barbarigos, Landolf; Ali, Nizar Bel Hadj; Motro, René; Smith, Ian F. C.

doi:10.1260/0266-3511.27.2-3.81

Cited by 46 publications

(28 citation statements)

References 31 publications

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“…deployability. Rhode-Barbarigos et al (2012b) then studied several deployment methods and showed that utilizing springs, inspired from (Schenk et al 2007), and clustered-cables reduces the number of actuators required for controlled deployment. Bel Hadj Ali et al (2011) proposed an analysis method for clustered tensegrity structures through a modified dynamic relaxation algorithm.…”

Section: The Tensegrity Ring Footbridgementioning

confidence: 99%

“…Two types of DR analyses are conducted to compare the test results with those from experimental tests. Numerical analysis with design stresses includes the values from Rhode-Barbarigos et al (2012b). Numerical analyses with measured cable loads are performed through introducing values that were obtained from measurements taken from the physical model.…”

Section: Deploymentmentioning

confidence: 99%

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Deployment of a Tensegrity Footbridge

2015

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Deployable structures are structures that transform their shape from a compact state to an extended in-service position. Structures composed of tension elements that surround compression elements in equilibrium are called tensegrity structures. Tensegrities are good candidates for deployable structures since shape transformations occur by changing lengths of elements at low energy costs. Although the tensegrity concept was first introduced in 1948, few full-scale tensegrity-based structures have been built. Previous work has demonstrated that a tensegrity-ring topology is potentially a viable system for a deployable footbridge. This paper describes a study of a near-full-scale deployable tensegrity footbridge. The study has been carried out both numerically and experimentally. The deployment of two modules (one half of the footbridge) is achieved through changing the length of five active cables. Deployment is aided by energy stored in low stiffness spring elements. Self-weight significantly influences deployment, and deployment is not reproducible using the same sequence of cable-length changes. Active control is thus required for accurate positioning of front nodes in order to complete deployment through joining both sides at center span. Additionally, testing and numerical analyses have revealed that the deployment behavior of the structure is non-linear with respect to cable-length changes. Finally, modelling the behavior of the structure cannot be done accurately using friction-free and dimensionless joints. Similar deployable tensegrity structures of class two and higher are expected to require simulation models that include joint dimensions for accurate prediction of nodal positions.

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Section: The Tensegrity Ring Footbridgementioning

confidence: 99%

Section: Deploymentmentioning

confidence: 99%

Deployment of a Tensegrity Footbridge

2015

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“…Changing cable lengths allows passing from one equilibrium configuration to another using finite mechanisms, while ensuring stability and stiffness (Rhode-Barbarigos et al, 2012b). The module has a height of 1m and a width of 0.87 m. To fold the simplex to half of its height, the length of horizontal cables has to increase while the length of vertical cables has to decrease.…”

Section: A Structurally Integrated Adaptive Tensegrity Structurementioning

confidence: 99%

Dialectic Form Finding of Structurally Integrated Adaptive Structures

Rhode-Barbarigos¹,

Charpentier²,

Adriaenssens³

et al. 2015

American Journal of Engineering and Applied Sciences

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Structural engineering, prompted by advances in mechanics and computing as well as design principles such as sustainability and resilience, is evolving towards adaptive structures. Adaptive structures are structures that use active components to change shape and properties in response to their environment and/or to their users' desires. Form-found structures, such as tensegrity and shell structures, can be designed to accommodate such changes within their structural behavior. Dialectic form finding is an extension of the traditional form-finding process integrating performance-related constraints and criteria in the search of a geometry in static equilibrium. Two examples of dialectic form-found structurally integrated adaptive structures are presented. The first example is a shape-shifting tensegrity-inspired structure, while the second example is a shapeshifting shell structure. Both systems are designed to explore elastic deformations for shape changes reducing actuation requirements and highlighting the potential of the proposed method.

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“…Adaptive modules with multiple actuators (such as servomotors or hydraulic pistons) may require perfect synchronization, to avoid residual stresses building up, in addition to well-defined maintenance and replacement schemes, to eliminate large out-of-operation costs. From a design perspective, the engineering of such shape shifting modules is often dictated by practical hinge and actuator related constraints such as allowable forces, available sizes and energy consumption [44] rather than energy related performance criteria.…”

Section: Adaptive Enclosuresmentioning

confidence: 99%

Dialectic Form Finding of Passive and Adaptive Shading Enclosures

et al. 2014

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Form finding describes the process of finding a stable equilibrium shape for a system under a specific set of loads, for a set of boundary conditions and starting from an arbitrary initial geometry. However, form finding does not traditionally involve performance constraints such as energy-related criteria. Dialectic form finding is an extension of the process integrating energy-related design aspects. In this paper, dialectic form finding is employed as an approach for designing high performance architectural systems, driven by solar radiation control and structural efficiency. Two applications of dialectic form found shading enclosure structures, a passive and an active one, are presented. The first application example is a site-specific outdoor shading structure. The structure is based on a louver system designed to provide protection from ultraviolet radiation over a pre-defined target only when required, promoting natural lighting and ventilation. The second application example is a shape-shifting modular faç ade system that adapts its opacity in response to environmental fluctuations. The system can thus improve the environmental performance of a building. Moreover, the system explores elastic deformations for shape changes, reducing actuation requirements. These examples OPEN ACCESSEnergies 2014, 7 5202 highlight the potential of the dialectic form-finding strategy for the design of high performance architectural integrated structures.

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Design Aspects of a Deployable Tensegrity-Hollow-rope Footbridge

Cited by 46 publications

References 31 publications

Deployment of a Tensegrity Footbridge

Deployment of a Tensegrity Footbridge

Dialectic Form Finding of Structurally Integrated Adaptive Structures

Dialectic Form Finding of Passive and Adaptive Shading Enclosures

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