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- Experimental and numerical analysis of a novel structure obtained by
joining two tensegrity-based units using simple construction methods-
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Authors: Nobuyuki Hagiwara, Yugo Fujishiro
Abstract: International Journal of Space Structures, Ahead of Print.
Structural systems based on tension and compression play a significant role in maximizing the performance of materials. Among them, structures based on the concept of tensegrity have attracted attention owing to their elegant design features and floating feeling. However, the complex construction of tensegrity-based structures hinders their implementation in practical design and architectural applications. Herein, we propose a novel tensegrity-based unit with simple connectivity and manufacturability. The external form of this unit is similar to that of a space-filling polyhedron. The prototype of the proposed unit is constructed, and the simple tension management of the unit is demonstrated. The mechanical behavior of the assembled structure is investigated by performing loading tests and numerical analyses. The behavior can be accurately predicted and general design can be applied to develop structures for practical applications.
Citation: International Journal of Space Structures
PubDate: 2024-08-17T06:36:20Z
DOI: 10.1177/09560599241267780
- The influence of dimensional parameters on the kinetic range of four
systems of deployable structures with hinged nodes and rigid rods-
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Authors: Adolfo Pérez-Egea, Pedro García Martínez, Manuel Alejandro Ródenas-López
Abstract: International Journal of Space Structures, Ahead of Print.
In several previous studies regarding foldable structures comprised of rods and knots, it has been usual to simplify their geometry to lines and points respectively. However, this study assumes that the dimensions that these elements necessarily acquire (due to their material condition) constitute an important issue in the folding and unfolding process. To test this hypothesis, the research first defines the concept of kinetic range and its various variants and studies how variations in the radius of the rods, the eccentricity of the knots and the opening angle influence this parameter. Furthermore, this study will demonstrate that this parameter is extensible to bar bundle systems and scissors systems and finally will verify that the results obtained by using algorithm-driven models are also verifiable by mathematical methods and experimentation using physical models. As a result, the methodology followed in this article allows the inclusion of a comparative table that classifies the performance of the structural systems studied in order to establish which is the optimum in relation to their kinetic range.
Citation: International Journal of Space Structures
PubDate: 2024-08-13T11:20:57Z
DOI: 10.1177/09560599241267783
- Design and analysis of bending-active configurations through an initial
flat-cut pattern based on the curvature lines-
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Authors: Armin Fathollahi, Valentina Beatini
Abstract: International Journal of Space Structures, Ahead of Print.
Bending active structures involve the deformation of originally flat structures during the erection process. These structures offer a promising approach to enhance design sustainability. However, despite advancements in structural computational methods, their implementation is still limited. This paper examines the constraints associated with this design approach from a designer’s perspective and proposes potential solutions. From this analysis, a design method is developed that utilizes additive manufacturing to explore different solutions during the concept stage. Prior to the form-finding process, a flat, variable-density pattern is created within a parametric environment. This pattern, referred to as the “Soft Pattern based on Control Points” (SPSCP), incorporates multiple design variables to accommodate diverse design requirements. In this preliminary study, we compare the impact of varying the design parameters on a small-scale model, as observed by the naked eye, and through finite element analysis.
Citation: International Journal of Space Structures
PubDate: 2024-05-22T11:28:58Z
DOI: 10.1177/09560599241249856
- Editorial
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Authors: Sigrid Adriaenssens, Alireza Behnejad
Abstract: International Journal of Space Structures, Ahead of Print.
Citation: International Journal of Space Structures
PubDate: 2024-05-06T07:35:54Z
DOI: 10.1177/09560599241253951
- Analysis and comparison on the mechanical behaviors of original
bolt-column (OBC) joint and improved bolt-column (IBC) joint-
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Authors: Zhicheng Xiao, Jingxuan Peng, Chengxin Li, Gengwang Yan, Huijun Li
Abstract: International Journal of Space Structures, Ahead of Print.
In this study, OBC joint is improved by incorporating one web, two flanges, and two additional bolts, putting forward a novel semi-rigid joint referred to as IBC joint. Finite element models of both OBC and IBC joints are established and the former is validated based on previous research. Subsequently, a total of 84 numerical models is utilized to investigate and compare the mechanical behaviors of OBC and IBC joints, taking into account different thicknesses of side plate and flange as wll as various loading conditions. The numerical results indicate that: (I) in comparison to OBC joints, the IBC joints exhibit significant enhancements in strong axis bending performance and axial tensile performance, including average enhancement ratios of 48%, 67%, 44%, and 19% in initial strong axis bending stiffness, ultimate strong axis bending moment, initial tensile stiffness and ultimate tension, respectively; (II) compared to OBC joints, the IBC joints demonstrate reduced capacity in axial torsional resistance and axial compressive performance, with mean decline ratios of 54%, 39%, 14%, and 7% in initial torsional stiffness, ultimate torque, initial compressive stiffness and ultimate compression, respectively; (III) OBC joints have better weak axis bending performance compared to IBC joints, but this gap decreases remarkably with increasing thicknesses of side plate and flange; (IV) the initial out-of-plane shear stiffness and ultimate out-of-plane shear of the IBC joint exhibit average enhancement of approximately 20% and 10%, respectively, when compared to those of the OBC joint; (V) regarding in-plane shear performance, the initial stiffness of IBC joints exceeds that of OBC joints by an average ratio of 61%, while IBC joints with flange thickness over 10 mm demonstrate significant improvement in ultimate capacity; (VI) The mechanical performance of OBC and IBC joints shows varying degrees of improvement with an increase in the thicknesses of side plate and flange.
Citation: International Journal of Space Structures
PubDate: 2024-03-07T06:37:06Z
DOI: 10.1177/09560599241234801
- Target shape approximation of funicular surfaces by load control using RBF
interpolation-
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Authors: Kazuki Hayashi, Jun Yanagimuro
Abstract: International Journal of Space Structures, Ahead of Print.
Existing methods for form-finding prioritize discovering optimal shapes under design load conditions, often overlooking the designer’s shape preferences. To address this problem, this research relaxes the load condition and develops a user-friendly form-finding tool that encapsulates a new method for obtaining funicular surfaces that pass through user-prescribed points through load control. The method involves generating smooth load distributions via RBF interpolation of nodal loads, which are repeatedly adjusted so that the equilibrium shape is close enough to the target points. For faster convergence, the step size of the load adjustment is automatically determined through a coarse line search, and a warm start is introduced in form-finding with the dynamic relaxation method. Despite uneven load distributions, the method ensures high accuracy in approximating the surface shape to the desired points while preserving funicularity against the load distributions. Additionally, the resulting load distribution gives designers valuable feedback on the specified target points, as the degree of load non-uniformity indicates the deviation from the equilibrium shape for uniformly distributed loads.
Citation: International Journal of Space Structures
PubDate: 2024-02-16T12:44:03Z
DOI: 10.1177/09560599241228537
- A form-finding method for adaptive truss structures subject to multiple
static load cases-
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Authors: Jan Gade, Florian Geiger, Roman Kemmler, Manfred Bischoff
Abstract: International Journal of Space Structures, Ahead of Print.
Form-finding is an essential task in the design of efficient lightweight structures. It is based on the crucial assumption of one single shape-determining load case, usually represented by self-weight. Adaptive components integrated into the structure open a way to even more efficient lightweight designs, as such structures can adapt their shapes to varying external loads and redistribute internal forces. This article presents a method for form-finding of adaptive truss structures subject to multiple, independently acting load cases, also incorporating possible design constraints. To ensure the consistency of the manufacturing lengths of passive elements in all load cases, special constraints are considered. The method enables to reduce sensitivity of the structural shape with respect to various different loads by means of actuation to meet design and serviceability requirements with a lower structural mass compared to conventional design strategies. This is demonstrated within a replaced real-world-like setting of an adaptive suspension truss bridge.
Citation: International Journal of Space Structures
PubDate: 2024-01-30T09:27:41Z
DOI: 10.1177/09560599231212707
- Mechanical behavior of PVDF membrane based on the uni-/bi-axial loading
experiments-
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Authors: Liu Ping, Tang Bai-Jian, Li WenRui, Chayut Ngamkhanong
Abstract: International Journal of Space Structures, Ahead of Print.
Recently, composite PVDF membranes with good performance have triggered enormous interest because of their great potential application. However, the uncertainty of mechanical properties limits their application. Herein, this paper reveals the elastic modulus properties of the loading angle between warp and tensile direction using the uni-axial tensile test of SH-1050P membrane textile. In addition, the bi-axial tensile test with different loading ratios was implemented. Both uni-axial and bi-axial ductile load-displacement/stress-strain curves are featured. It is the first to establish a relationship between the elastic modulus and the loading angle using a theoretical method based on the assumption that there is no slippage and crease between yarns and matric. Furthermore, simulations with different textile parameters were carried out to verify the theoretical results. The key finding is that the elastic modulus under uni-axial load can be divided into two stages, which are elasticity and plasticity. Both of which are proportional to the sine function applied to two times the loading angle. The Poisson’s ratio of SH-1050P textile can be considered as a fixed value of 0.11. This conclusion can be extended to similar textiles. The outcome of this paper contributes to a deeper understanding of the PVDF memrane’s mechanical behavior and presents a novel insight into its response to different loading conditions.
Citation: International Journal of Space Structures
PubDate: 2023-12-21T07:21:11Z
DOI: 10.1177/09560599231214638
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