 Subjects -> AERONAUTICS AND SPACE FLIGHT (Total: 124 journals)
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Authors: Sigrid Adriaenssens, Alireza Behnejad
Pages: 3 - 3
Abstract: International Journal of Space Structures, Volume 38, Issue 1, Page 3-3, March 2023.
Citation: International Journal of Space Structures
PubDate: 2023-02-28T07:08:21Z
DOI: 10.1177/09560599231158660
Issue No: Vol. 38, No. 1 (2023)
- Optimized orientation of jointing system in free-form lattice space
structures-
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Authors: Hadi Esmailnejad, Mohammad Reza Chenaghlou, Karim Abedi
Abstract: International Journal of Space Structures, Ahead of Print.
The recent decades have witnessed the development of a new generation of space structures called free-form space structures. In this new family of space structures, due to the geometric nature of the structure, the orientation of the members varies substantially within the joints, meaning that the members need to be connected to the joints at different angles. The wide distribution of these angles throughout the structure will significantly affect the cost of fabrication. Therefore, accurate and automatic calculation of connection angles and their optimizations have always been of interest to researchers and manufacturers. This article has the following two main objectives. The first objective is to provide geometric calculations and obtain the connection angles of single-layer lattice space structures. The second, and more important objective is to review the existing methods and to develop a geometrical method for their optimization, referred to as the “node orientation optimization” method throughout this article. Using the mentioned method, a series of optimizations are carried out in a number of free-form lattice space structures and the results are studied.
Citation: International Journal of Space Structures
PubDate: 2023-02-18T05:53:55Z
DOI: 10.1177/09560599231153103
- Snap-interlock module system: Exploring an alternative architectural
construction method-
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Authors: Jin Young Song, Dan Vrana, Seoyoung Heo, Xiangdong He, Jongmin Shim
Abstract: International Journal of Space Structures, Ahead of Print.
Responding to the rise of temporary architecture motivated by fast changing cultural and societal interests, construction methods must be adapted to meet the needs of reconfigurable systems. The prototype of Snap-Interlock Module System (SIMS) proposed in this study aims to integrate the simplicity of dry stacking as a primitive construction method through a coordinated joint system in order to increase material efficiency and structural integrity. This study explores a method of stacking blocks using unique interconnecting mechanisms without bonding agents to allow for reconfigurability. The considered unit of SIMS is configured to have four legs with integrated hooks on both top and bottom, allowing each block to snap into four adjacent blocks on either end. The centerpiece is designed such that each block can individually possess geometric versatility toward organic growth of the whole system. Larger assemblies of SIMS blocks can create full-scale structures without the use of bolting, welding, or other bonding agents. Finite element analysis demonstrates that the explored interlocking motion falls into the elastic range of the considered steel and confirms that structural integrity can be secured at the building scale as well. In order to test the proof-of-concept, 1:3 scaled Polylactic Acid (PLA) blocks are 3D printed and assembled into a 2.5 m tall portal frame, leading to a full-scale structural model executed with six full-scale steel blocks. The assembly and disassembly of both prototype structures are easily executed by a single individual. Despite the limitations of the chosen fabrication methods and material choices, the study promises diverse applications in the changing urban context and contributes to the broader sustainability of our built environment via an alternative and reconfigurable construction method.
Citation: International Journal of Space Structures
PubDate: 2023-01-16T06:59:01Z
DOI: 10.1177/09560599221147468
- 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
- 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
First page: 4
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
- Discussion on cable-strut systems of the suspen-dome structures
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Authors: Renjie Liu, Muqiao Li, Tianchen Cheng
First page: 20
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
- Strengthening techniques for masonry domes: A review
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Authors: Alemdar Bayraktar, Serap Bayraktar, Emin Hökelekli
First page: 30
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
- 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
First page: 40
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
- 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
First page: 64
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
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