Space Structures Research Papers - Academia.edu (original) (raw)

Top Papers
Most Cited Papers
Most Downloaded Papers
Newest Papers
People
- by and +1
- •
- Civil Engineering, Space Structures
- by Iasef Md Rian
- •
- Civil Engineering, Space Structures
- by Jan Knippers and +1
- •
- Civil Engineering, Architectural Geometry, Space Structures

In this paper structures that actively use bending as a self-forming process are reviewed. By bringing together important material developments and various historical as well as recently built samples of such structures, the aim is to show coherences in their design approach, structural systems and behaviour. Different approaches to bending-active structures are defined and described. By making this work accessible and categorising it, this paper aims to contribute to an emerging development. A differentiation of such structures is suggested based on their design approaches. Three such approaches are differentiated: the behaviour based approach, the geometry based approach and current research that seeks to integrate the two. In this paper the nature of these approaches and some important project samples are discussed

- by Christoph Gengnagel and +1
- •
- Civil Engineering, Space Structures
- by Christoph Gengnagel
- •
- Space Structures
- by Ebrahim Sanaei and +1
- •
- Deployable Structures, Steel Structure, Geometry, Space Structures
- by Aparna Harichandran
- •
- Tensegrity Structures, Space Structures, Form Finding

Introduced centuries ago, deployable/foldable structures have been more thoroughly investigated during the recent decades. One of the famous types of these structures is the scissor-link configuration, which contains duplets. Most of the studies, however, have been focused on geometric and structural design of single layer forms, formulation for configuration, nonlinear analysis and optimal form findings. From the structural and architectural points of view, however, multi-layer deployable free forms have many advantages. In this work, formulation for multi-layer forms is developed more accurately by satisfying foldability conditions. Feasibility of these types is discussed by proposing simple connections and evaluating different design parameters. Flat multi-layer forms of 6m to 15m span are designed and compared by weight and maximum deflection as objective functions, to select the optimal form. Results show that some geometric parameters have to be defined and then feasibility of the required geometry should be tested numerically.

- by Mehdi Babaei
- •
- Structural Engineering, Optimization techniques, Optimization, Arcitecture

Bending-active structures are composed of curved beam or shell elements which base their geometry on the elastic deformation of an initially straight or planar configuration. In bending-active structures the moment of inertia has a direct influence on the residual stress and is therefore limited by a given minimal curvature in the system and the permissible bending stress capacities of the chosen material. These interdependencies may lead to a scaling issue that limit bending-active structures to a certain size range. This range may be widened if the system's reliance on elastic stiffness is compensated by other stiffening factors such as coupling of structural elements and stress stiffening effects. This paper will analyse the scaling effects in bending-active structures. Some basic systems are studied by means of dimensional analysis and FEM parameter studies to clarify at which power each influencing factor effects scaling. Based on these findings some more complex structures...

- by Jan Knippers
- •
- Civil Engineering, Space Structures

In this paper, the influence of external and internal effect of sulphate on normal and high performance concrete was studied. The aim of this experimental study is to evaluate the effect of external severe sulphate solution on compressive strength of concrete mixes containing two different internal sulphate. The experimental work included of casting and testing of 360 concrete cubes, half of them fully immersed in ground water solution with sulphate SO4 =6965 ppm. The other half of cubes was immersed in tap water to be references. Sulphate resistance cement and ordinary Portland cement with 10% silica – fume used in mixes. Two types of locally available sand were used (standard SO3= 0.2% and non-standard SO3= 1.13%). The results showed that the compressive strength development continuously increases in specimens immersed in tap water and the development rate decreases when the w/c ratio decreases. The harmful effect of internal sulphate in concrete was decreased by using type I cement with 10% silica –fume replacement and low w/c ratio. The effect of internal sulphate was clearly appeared at early ages till 90 days when using non-standard sand in mixture with low w/c ratio 0.31. Using of silica fume concrete with w/c ratio of 0.45 is more effective to enhance the concrete resistance to external sulphate attack.

In this study, isogrid columns used in various space applications are made using a novel in-space manufacturing process termed Bend-Forming. The process uses a machine that bends a continuous strand of wire at specific locations, to form a flat lattice. Several straight wire members are attached at the bend locations using 3D-printed joints, and the lattice is then rolled to form a 3D column. Four columns with varying geometric parameters are fabricated. Compression tests are conducted on these columns, and their buckling and post-buckling behavior is investigated. These experiments show that the structures undergo a smooth formation of buckling deformations, and that contrary to thin-shell columns, they do not exhibit an abrupt destabilization past their first bifurcation. A finite element model is then implemented and numerical results are compared to the experimental responses. The comparison highlights the importance of the joint compliance in the initial response of the structure and identifies the need for modeling softer joints. Nonetheless, the model accurately predicts the maximum loads the columns can withstand and highlights the imperfection-insensitive nature of these structures, as compared to conventional shell structures.

- by Harsh Bhundiya
- •
- Structural mechanics, Space Structures
- by Lakshmikandhan Pkn
- •
- Civil Engineering, Structural Engineering, Space Structures
- by Ramon Sastre
- •
- Civil Engineering, Tensegrity, Space, Space Structures

Double layer grids are an important family of space structures used to cover large spaces. For ease in fabrication, handling and speedy on-site erection double layer grid is widely used. Connecting members of double layered grid plays a vital role in structural strength as well as economical aspect of the structure. The present study is on balancin g both the structural & economic aspect of Connection system of double layered grid structure. An attempt has been made to reduce the weight of recently developed Truncated Hexahedron connector i.e. THH 130 by making it hollow. Both, solid THH130 and hollo w THH130 models have been analysed using ANSYS software and results of stresses have been obtained under different static loads. The comparison of the result validates the possibility of it being economically feasible solution. The term 'space structure' is a three dimensions structural system. It is more advantageo us for easy transportation, fast assembly, mass production, light weight and aesthetic view. A Double Layer Grid consists of two plane grids in the top and bottom layer s, parallel to each other and interconnected by vertical and/or diagonal members. Ahmed El-Sheikh et.al [1] developed a space truss system, named Catrus is introduced, and that has continuous chord members and does not need node components as an attempt to reduce the cost of space trusses without a compromise in their behaviour or ease of construction. Jin-Woo Kim et.al [2] discussed the behaviour of post-tensioned space trusses with HYPAR shape and ultimate load test that was performed on such structures. It was shown that the hypar space truss has significant structural strength with ease in simplifying fabrication and erection processes. Zhang Yulan et al [3] discussed about the structure and design method of ribbed steel ball nodes wherein nonlinear finite element method was applied. The bearing capacity and deformation capacity of ribbed steel ball nodes in complex stress state was analysed to determine mechanical performance of the ribbed steel ball. Koushky A. et al [4] investigated the behavior of space structures with compositive nodes. Structural modeling, closeness of analysis and test results were demonstrated by 3-D modeling, modeling of eccentricity of joints, material nonlinearity and load deflection diagrams of the structures. Ghasemi et al [5] presented the relationship of force-displacement of MERO jointing system. It was shown through the experiments that the behaviour of connector was nonline ar and was affected by the degree of bolt tightness. Arekar et al [6] presented the analytical study of MERO-connector in double layer grid structure using ANSYS software. Neil D. Sheth et al [7] compared the stress pattern of MERO and THH150 and concluded that THH150 is as strong as MERO connector. Faizullah R. Bhania et.al [8] worked to reduce the weight of THH150 by modifying the size of THH150 connector and the stresses were studied under different loading conditions using Finite Element Analysis softwa re – ANSYS and elaborated how the maximum principal stress values varies linearly as load increases linearly and were found quite high near all corner supports and reducing towards central region for all the nodes. The present paper focuses on reduction in weight of THH130 connector which consists of a solid mild steel cube of size 130 mm, with all the eight corners cut at a specific angle so that to get converted into a truncated hexahedral cube with fourtee n plane surfaces; out of which six are perfect octagons and remaining eight are equilateral triangles. The weight of THH130 connector is 16.3 kg. To reduce weight, a 30 mm diameter hole is drilled throughout its core. The weight of Hollow THH130 connector is 14.61 kg. Figure 1 shows the geometry of both, solid and hollow THH130 connectors.

- by Pierre de Kermel
- •
- Civil Engineering, Industrial Design, Space Structures
- by Peter Gosling and +1
- •
- Civil Engineering, Space Structures
- by Larry D Busbea
- •
- Buckminster Fuller, Design Patterns, Topology, Situationist International
- by K.-u. Bletzinger
- •
- Civil Engineering, Design Methodology, Space Structures
- by Cristina Manchado
- •
- Civil Engineering, Design, Tensegrity, Structures

This paper initially investigates the previous works on foldable structures. Subsequently, generation and geometric (architectural) design of compatible foldable structures with scissor-like elements is formulated for various shapes of barrels with no geometric limitations (free forms) for the purpose of configuration processing. Special cases for configuration processing based on given formulation are studied to obtain different geometries. For example, the division of the sum of the internal angles of duplets leads to different geometries. The method employed for this division could be equal between duplets, according to arithmetic or geometric progression, or using algebraic equations. These methods are used to divide the sum of internal angles and radius of curvature; Corresponding geometries are then created and compared. The method to generate a geometry imposed by architectural requirements is also proposed in this work. Using such ordering, one can create and model free form...

- by Ebrahim Sanaei
- •
- Engineering, Deployable Structures, Steel Structure, Geometry
- by Nizar Bel Hadj Ali
- •
- Civil Engineering, Space Structures
- by Michael El-Raheb
- •
- Space Structures
- by Nikos Lagaros
- •
- Civil Engineering, Neural Network, Space Structures, Evolution Strategy
- by M zeinoddini
- •
- Civil Engineering, Space Structures
- by Christoph Gengnagel
- •
- Civil Engineering, Space Structures
- by Mehdi Babaei
- •
- Deployable Structures, Space Structures, Spatial Structures

The structural making of the Eden Domes K. KNEBEL, J. SANCHEZ-ALVAREZ, S. ZIMMERMANN MERO GmbH & Co. KG, D-97084 Wurzburg, Germany INTRODUCTION In the spring of 2001, on the south-western tip of England in Cornwall, the Eden Project was... more

- by Jaime Sanchez-Alvarez
- •
- Materials Science, Space, Space Structures

Tensile integrity (tensegrity, tensegric) structures are suggested for possible use in outer space and on space bodies because of their minimal need for structural materials, ease of transfer and mounting. Structurally their behavior is non-linear. It has been shown here that their structural analysis can successfully be performed by total potential optimization using meta-heuristic algorithms (TPO/MA). The named method is an emerging technique that combines minimum energy principle of mechanics with metaheuristic algorithms. The technique thus defined has been shown to be very efficient, accurate and robust in analyzing structures. The success of the technique is especially profound for non-linear structures. In this study the named technique is applied to tensile integrity (tensegrity, tensegric) structures which are known to be highly nonlinear, thus difficult to analyze.

- by Bahador Mirzaei
- •
- Space Structures, Optimal Design, Barrel Vaults, IMCSS Algorithm
- by K.-u. Bletzinger
- •
- Civil Engineering, Finite Element Analysis, Membrane, Space Structures
- by Adrien Quaglia and +1
- •
- Space Structures
- by Arjang Sadeghi
- •
- Civil Engineering, Space Structures

1. INTRODUCTION As the occurrence of instability phenomenon is the main characteristics in the behaviour of single-layer braced domes, the stability and collapse behaviour of these structures have been studied extensively. One of the most... more

- by G. Parke
- •
- Civil Engineering, Experimental Study, Space Structures

This paper describes the evolution of an innovative concept devised by Dante Bini in the early Sixties and later developed in a series of construction systems. This concept is based on the use of air pressure as a source of power for developing an automatic building process. The idea has further developed into a series of technologies based on the use of energy stored within various components of a self-shaping structure. These concepts may represent a first step toward “Auto-construction”.

- by Dante Bini
- •
- Engineering, Civil Engineering, Space Structures
- by René Motro
- •
- Engineering, Civil Engineering, Control, Actuators

The study of deployable structures has been carried out traditionally by simplifying their constituent elements—joints and rods—to ideal entities. However, in this paper the dimensional thickness of these elements is taken into account, in order to evaluate their incidence on the foldability of four deployable structure systems. We have examined the eccentricity that occurs specifically at the joints themselves. Our study ultimately characterizes the incidence of this factor by defining noteworthy parameters common to both tube bundle and scissor systems, enabling us to establish a comparison and draw relevant conclusions.

- by Pedro García Martínez
- •
- Space Structures
- by Joseph Rizzuto
- •
- Engineering, Civil Engineering, Space Structures

1 INTRODUCTION, BACKGROUND The elemental module that creates this structural typology is made up of four bars connected with each other in a inner joint by means of inserting an additional piece and fixing pins (Fig.1). In addition, it... more

- by Juan Pérez
- •
- Civil Engineering, Space, Space Structures

Recently, as aviation industry has been activated, development of software related to composite materials has been demanded. Composite analysis requires specialized structural analysis and test evaluation. Therefore, it is necessary to use existing commercial software to analyze the composite structure, but existing commercial software only provides limited functions. Especially, since there is no specialized software for corner structure analysis of aerospace composites spa structure, much human resources and time are consumed in structural analysis. In order to solve this problem, we developed a GUI-based automation software based on user-friendly GUI that reflects the existing corner structure analysis procedure and provides multiple breakdown criteria. To verify the reliability of the structural analysis results of the developed software, it was confirmed that there is no problem in the structural analysis performance as a result of comparing with the existing analysis results.

- by Seok-Wun Ha
- •
- Composites, Structural Analysis, Space Structures, Corner Detection
- by M. Sheidaii and +1
- •
- Civil Engineering, Space Structures