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  Subjects -> AERONAUTICS AND SPACE FLIGHT (Total: 124 journals)
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International Journal of Space Structures
Number of Followers: 19  
 
  Full-text available via subscription Subscription journal
ISSN (Print) 0266-3511 - ISSN (Online) 2059-8033
Published by Sage Publications Homepage  [1175 journals]
  • Development, realization, and experimental validation of an active hybrid
           roof structure based on elastic kinetic and rigid-body transformation

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      Authors: Paul Marker, Robert Jirasek, Therese Schmidt, Achim Bleicher
      Abstract: International Journal of Space Structures, Ahead of Print.
      Elastic kinetic structures are a recent approach to design transformable structures. Their transformation is based on elastic bending, that is compliant component behavior of structural members. This principle can be used to realize transformable structures with a stable deployment process. Regardless of a stable transformation, elastic kinetic structures are prone to static and dynamic loads due to their lightweight design. However, most of current research on these structures solely focuses on the principles of transformation. This paper proposes a concept for an active hybrid roof structure with a transformation based on elastic kinetics and rigid-body motion. The concept exhibits a stable structural deployment and active control components to counteract static and dynamic disturbances. Furthermore, this paper includes the realization and experimental evaluation of a mid-scale prototype structure.
      Citation: International Journal of Space Structures
      PubDate: 2022-11-24T11:00:22Z
      DOI: 10.1177/09560599221134286
       
  • An analysis of the elastic-plastic seismic response of inner and outer
           cable-supported latticed shell structures

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      Authors: Guangying Ma, Yunlong Yao, Guangen Zhou, Xiaocheng Bao
      Abstract: International Journal of Space Structures, Ahead of Print.
      This paper studies the elastic-plastic seismic response of 12 inner and outer cable-supported latticed shell structures under fortification intensity and rare earthquakes. The influencing factors of the 12 models were analyzed. These included span, initial pretension, bottom structure form, connection condition of support, rise-span ratio, and inner cable-supported latticed shell span. Based on the calculation results, we summarize the plastic region of the top latticed shell and the plastic development extent under 7-degree and 8-degree fortification intensity and rare earthquakes, the post-seismic cable force changes, and the development characteristics and distribution rules of residual deformation of top latticed shell. Our investigation indicates that the span, bottom structure form, and connection condition of the support are most sensitive to the elastic-plastic response of the inner and outer cable-supported latticed shell. A strong earthquake can cause a loss of pretension, which primarily happens at inner looped cables and inner inclined cables of the inner cable-supported latticed shell. Cable force change is more sensitive to the asymmetric bottom structure, the latticed shell with a high rise-span ratio, and the span of the inner cable-supported latticed shell. The inner and outer cable-supported latticed shell model loses less cable force after a strong earthquake, and the post-seismic loss ratio is less than 10%, even under the impact of a severe, 9-degree earthquake.
      Citation: International Journal of Space Structures
      PubDate: 2022-11-03T11:39:49Z
      DOI: 10.1177/09560599221132498
       
  • On designing plane-faced funicular gridshells

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      Authors: Cameron Millar, Toby Mitchell, Arek Mazurek, Ashpica Chhabra, Alessandro Beghini, Jeanne N Clelland, Allan McRobie, William F Baker
      Abstract: International Journal of Space Structures, Ahead of Print.
      Concepts from isotropic geometry, Timoshenko’s shell theory, Airy stress functions and Maxwell’s reciprocal diagrams are combined in the design of plane-faced funicular gridshells. The notions of self-Airy and mixed-Airy gridshells are introduced, with an emphasis on self-tied gridshells. This paper extends the work of J.C. Maxwell for 2D pin-jointed trusses to 2.5D gridshells with the addition of a new reciprocal figure called the slope diagram. The form, force and slope diagrams are combined by a mixed area calculation to produce another new figure called the Maxwell-Mondrian diagram. A powerful new design process leveraging the relationship between the gridshell geometry and the Airy stress function is presented.
      Citation: International Journal of Space Structures
      PubDate: 2022-11-03T11:36:22Z
      DOI: 10.1177/09560599221126656
       
  • Strengthening techniques for masonry domes: A review

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      Authors: Alemdar Bayraktar, Serap Bayraktar, Emin Hökelekli
      Abstract: International Journal of Space Structures, Ahead of Print.
      Historical masonry domes are an important part of the architectural and engineering heritage in the World. They have been extensively used to cover the spaces of temples, mausoleums, palaces, forts, baths, churches, mosques, etc. Damages and collapses of masonry domes occurred as a result of earthquakes or lack of maintenance. Therefore, many efforts have been devoted to clarifying the theoretical and experimental responses of masonry domes by researchers. In addition to traditional techniques, significant developments have been achieved on the strengthening of masonry domes using innovative techniques. The study firstly presents a complete review on the state of knowledge about theoretical and experimental responses and strengthening of masonry domes under static and dynamic loads. Then crack patterns and failure mechanisms of masonry domes are explained, and traditional and innovative strengthening techniques that can be rehabilitated the masonry dome without any harmful intervention or disagreement with conservation principles are introduced and evaluated in detail.
      Citation: International Journal of Space Structures
      PubDate: 2022-10-18T01:51:52Z
      DOI: 10.1177/09560599221126652
       
  • Discussion on cable-strut systems of the suspen-dome structures

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      Authors: Renjie Liu, Muqiao Li, Tianchen Cheng
      Abstract: International Journal of Space Structures, Ahead of Print.
      According to the architectural requirements, the roof structure of a large-span gymnasium adopts the suspen-dome structure. In the scheme selection stage of the pre-stressed cable-strut system at the bottom part of the suspen-dome structure, a Levy-type scheme and a Loop-free scheme are established. The finite element models are established, and the static analysis under the design loads, the whole process analysis of load-displacement, and the dynamic response analysis after accidental cable break are carried out. The architectural expression of the two schemes are discussed. The component material consumption, the structural stiffness, the tension distribution characteristics, and the static bearing capacity of the two schemes are discussed. The failure mode and the progressive collapse resistance of the two schemes after accidental cable break are also discussed. The results show that the Loop-free scheme requires significantly less in terms of component material consumption than the Levy-type scheme. The static failure mode of the two schemes is strength failure, but the Loop-free scheme has greater bearing capacity. The Loop-free scheme has greater structural stiffness, lower cable forces, and uniformly distributed cable forces in each layer, and lower stress on the top reticulated shell members. Neither of the two schemes experience progressive collapse after accidental cable break. Due to the rupture in the loop cable of the Levy-type scheme, the rigidity of the rear region decreases greatly, and the cable force loss is large. On the contrary, internal force redistribution occurs in the Loop-free cable scheme and the cable force loss is not obvious, hence the progressive collapse resistance is better than that of the Levy-type scheme.
      Citation: International Journal of Space Structures
      PubDate: 2022-08-16T06:15:07Z
      DOI: 10.1177/09560599221119042
       
  • Numerical simulation of snowdrift on an air-supported membrane structure
           and response analysis under snow loads

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      Authors: He Yanli, Yan Xiaolin, Li Xiongyan
      Abstract: International Journal of Space Structures, Ahead of Print.
      The air supported membrane structure is a typical nonlinear flexible long-span space structure, the wind-induced drift and the resulting accumulation and distribution of snow particles on the structure may be the primary design concern among all loads in heavy-snowfall region. Thus, an accurate prediction of snow distribution on membrane surface is vital to structural design. A numerical simulation method is used to estimate snowdrift in this paper. Based on Euler-Euler method in multi-phase flow theory, this numerical model adopted Mixture model and combined with the snow deposition and erosion model, the snowdrift on an air-supported membrane coal shed is simulated, the distribution factor for roof snow load is given under different wind speed and different directions to estimate the worst load case, snow load on the air-supported membrane structure is significantly affected by snowdrift which causes significant non-uniform snow load. Furthermore, the response analysis of the air-supported membrane structure under snow load is studied, for comparison, uniform snow load case, non-uniform snow load case, and simulated snow load case under 0° wind direction are all considered. The results show that non-uniform snow load caused by snow drifting is more dangerous and should be considered.
      Citation: International Journal of Space Structures
      PubDate: 2022-07-13T09:50:27Z
      DOI: 10.1177/09560599221108624
       
  • Structural parts as quadrics: Elasticity ellipses revisited

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      Authors: Tamás Baranyai
      First page: 213
      Abstract: International Journal of Space Structures, Ahead of Print.
      Elasticity ellipses or central ellipses have been long used in graphic statics to capture the elastic behaviour of structural elements. The paper gives a generalisation the concept both in dimensions and in the possibility of degenerate conics/quadrics. The effect of projective transformations of these quadrics is also given, such that the entire mechanical system can be transformed preserving equilibrium and compatibility between its elements.
      Citation: International Journal of Space Structures
      PubDate: 2022-03-08T11:51:05Z
      DOI: 10.1177/09560599221081013
       
  • Equivalent static loads for double-layered domes supported by multistorey
           buckling-restrained braced frames

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      Authors: Deepshikha Nair, Yuki Terazawa, Toru Takeuchi
      First page: 227
      Abstract: International Journal of Space Structures, Ahead of Print.
      Curved gridshells are excited not only in the horizontal direction but also experience large anti-symmetric vertical accelerations when subjected to horizontal earthquake ground motions. In addition to the coupled response, gridshells exhibit closely spaced modes and substructure-roof interaction. Nevertheless, previous studies have proposed elastic horizontal and vertical equivalent static seismic forces considering these complex dynamic response characteristics. These are determined from the input horizontal acceleration at the substructure’s roof level, an assumed acceleration distribution, nodal roof masses and amplification factors derived from the dynamic characteristics of the dome and substructure. To extend this methodology to nonlinear substructures with displacement-dependent damping devices, this paper investigates the applicability of ductility reduction factors (or Rμ factors) to estimate the inelastic response spectra and an alternative equivalent linearisation approach to compute the peak horizontal acceleration of multistorey substructures with buckling-restrained braces. This is achieved by modelling the curved roof as a rigid mass for the substructure model, and using its idealised base shear-roof displacement relationship obtained from modal pushover analyses. The peak horizontal acceleration of the substructure is then used to obtain the equivalent static loads of the curved roof using amplification factors, and the accuracies are verified against the results from nonlinear response history analyses. It was confirmed that the Rμ [math]factors combined with the roof amplification factors provide a simple way to estimate the peak roof response with sufficient accuracy for preliminary design of domes with multistorey substructures having low post-yield stiffness.
      Citation: International Journal of Space Structures
      PubDate: 2022-06-13T02:05:07Z
      DOI: 10.1177/09560599221097834
       
  • Form-finding of shells containing both tension and compression using the
           Airy stress function

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      Authors: Masaaki Miki, Emil Adiels, William Baker, Toby Mitchell, Alexander Sehlström, Chris J. K. Williams
      First page: 261
      Abstract: International Journal of Space Structures, Ahead of Print.
      Pure-compression shells have been the central topic in the form-finding of shells. This study investigated tension-compression mixed-type shells by utilizing a NURBS-based isogeometric form-finding approach that analyses Airy stress functions to expand the possible plan geometry. A complete set of smooth version graphic statics tools is provided to support the analyses. The method is validated using examples with known solutions, and a further example demonstrates the possible forms of shells that the proposed method permits. Additionally, a guideline to configure a proper set of boundary conditions is presented through the lens of asymptotic lines of the stress functions.
      Citation: International Journal of Space Structures
      PubDate: 2022-06-27T11:51:22Z
      DOI: 10.1177/09560599221102618
       
  • Revisiting the Eden Project: The geometry of the Domes

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      Authors: Jaime Sanchez-Alvarez
      First page: 283
      Abstract: International Journal of Space Structures, Ahead of Print.
      The Eden Project in Cornwall, UK, has probably the largest greenhouse complex in the world, comprehending eight interconnected spherical geodesic domes. The geometric design and optimisation of the double-layered spherical structures focussed primarily on the hexagonal grids of the external dome surfaces, where optimisation consisted of minimising the number of component types, being these components, faces, line lengths and angle combinations at grid nodes. The present article reviews the general geometric definition of the Eden Domes and elaborates, for the first time since the domes design around the year 2000, on their geometric optimisation. The results of this rationalisation are presented in colour images, which were produced with state-of-the-art (2021) software tools 20 years after the design development. The images reveal the geometric ‘economy’ – here, the extreme reduction of geometric component types – and the high symmetrical order of these structural configurations. The aim of the present paper is to present the thorough geometric specification of the Eden Domes in a single document that answers in detail the question of how the Eden Domes grids were geometrically constructed.
      Citation: International Journal of Space Structures
      PubDate: 2022-07-29T05:53:23Z
      DOI: 10.1177/09560599221110220
       
 
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