Relevant bibliographies by topics / Space trusse

Academic literature on the topic 'Space trusse'

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Published: 14 March 2023

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Journal articles on the topic "Space trusse"

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Wu, Hui, Wen Feng Du, and Yi Jun Wang. "Failure Mechanisms and Progressive Collapse Judgment Criterion of Space Trusses under Strong Earthquakes." Applied Mechanics and Materials 90-93 (September 2011): 1581–85. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.1581.

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Aiming at failure mechanisms and judgment criterion of progressive collapse for space trusses, the responses and the failure mechanisms of diagonal square pyramid space trusses, leaning laid pyramid space trusses and orthogonal square pyramid space trusses with circumferential simple supports under different seismic waves were analyzed in this paper. The results show that space trusses have a good performance of earthquake resistance, but progressive collapse occurs easily. Based on the failure mechanisms of space truss, a judgment criterion of space truss is proposed under strong earthquakes, according to the characteristics of energy, displacements and plastic levels of members. The judgment criterion is expressed by judgment coefficient J. When J>6, space trusses tend to be ductile failure, however, When J> 6, space trusses tend to be progressive collapse.
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Silva, Welington V., Ramon Silva, Luciano M. Bezerra, Cleirton A. S. Freitas, and Jorge Bonilla. "Experimental Analysis of Space Trusses Using Spacers of Concrete with Steel Fiber and Sisal Fiber." Materials 13, no. 10 (May 16, 2020): 2305. http://dx.doi.org/10.3390/ma13102305.

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Space trusses are structural systems, generally made of tubes, used worldwide because of their advantages in covering long-span roofs. In addition to having a low cost, the truss weight is relatively reduced. The load capacity of these structures depends also on the strength of their node connection. Connections made with the superposition of flattened tube ends trespassed by one bolt are, generally, known as typical nodes. They are inexpensive but present eccentricities that reduce significantly the strength of such space trusses. To increase the truss load capacity, this research presents the results of an experimental program to reduce the eccentricities of the typical nodes. This reduction is done with a new type of spacer made of encapsulated concrete with steel fiber or sisal fiber. The experimental tests showed that the trusses with typical nodes collapsed under reduced load by local failure due to high distortions at the nodes. The trusses with encapsulated concrete spacer showed good results, with an increase in collapse load of 36% and failure by buckling bars.
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El-Sheikh, Ahmed. "Sensitivity of Space Trusses to Uneven Support Settlement." International Journal of Space Structures 11, no. 4 (December 1996): 392–400. http://dx.doi.org/10.1177/026635119601100406.

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Uneven support settlements are a liability for every structure. However, as space trusses typically span large areas on few outer supports, they are more likely to encounter some uneven settlements. This paper presents an assessment of the sensitivity of space trusses to settlements in various situations with different aspect ratios and supporting conditions, and under different types and magnitudes of uneven support settlement. Additionally, the effect of composite action between a top concrete slab and a steel truss on truss sensitivity to uneven settlements is assessed. The work is carried out on twelve non-composite and composite square-on-square space trusses.
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El-Sheikh, Ahmed. "Sensitivity of Composite and Non-Composite Space Trusses to Member Loss." International Journal of Space Structures 9, no. 2 (June 1994): 107–19. http://dx.doi.org/10.1177/026635119400900205.

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Since double layer space trusses have typically a large number of redundant members, it is frequently assumed that they are quite safe as the loss of one or more members can be accommodated without any noticeable effect on truss overall behaviour. The present study shows that every truss includes a number of critical members, the loss of any of which would cause force distributions that could lead to an overall premature collapse. The sensitivity of space trusses to member loss is clearly identified. The composite action between a top concrete slab and a space truss is also introduced as a means to control truss sensitivity to member loss. Factors that affect this sensitivity such as the truss supporting conditions are also investigated.
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El-Sheikh, A. L. "Numerical Analysis of Space Trusses With Flexible Member-End Joints." International Journal of Space Structures 8, no. 3 (September 1993): 189–97. http://dx.doi.org/10.1177/026635119300800305.

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The conventional procedure for the analysis of space trusses, lattice domes and similar structures, assumes that member-end joints behave as pure pins or, in some cases, as rigid joints. However, experimental studies have shown that these joints typically exhibit some level of flexural stiffness and are therefore flexible (semi-rigid). It was reported that the characteristics of the space truss jointing system play a major role in truss response (see Refs. 1,2,3). The results of experiments conducted on space trusses with rigid or flexible joints produced less brittle behaviour than that found for assemblies with nominally-pinned joints. A nonlinear beam-column element with end springs has been developed to model the actual rotational stiffness of truss member-node connections, and its stiffness expressions are presented in this paper. Incorporation of this element in the numerical analysis of space trusses has led to better predictions of behaviour and strength when compared to the commonly-used two-noded frictionless truss element. This new element was used successfully in the numerical analysis of two non-composite and one composite double-layer space truss, and the results are presented in this paper.
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El-Sheikh, A. L. "Nonlinear Numerical Analysis of Composite Space Trusses." International Journal of Space Structures 9, no. 4 (December 1994): 219–25. http://dx.doi.org/10.1177/026635119400900405.

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The composite action between an upper concrete slab and a double-layer space truss has been shown to have positive effects on the behaviour of such structures. Primarily, the prevention of the typical brittle behaviour of trusses and the introduction of appreciable ductility are among the important benefits. Substantial improvements have been achieved also in both stiffness and ultimate strength. The analysis of composite space trusses requires a careful study especially in the modelling of the shear connection between the concrete slab and the steel truss, involving shear studs mounted on both the nodes and the members of the top chord. Additionally, parts of the concrete slab may be projecting inside the top chord members, and therefore contribute to the shear interaction. This connection, being far from simple, could be modelled using various techniques. The present paper concentrates on these techniques, and numerical results are produced for each case (using a previously-developed and verified finite element program) and compared with the experimental results of a full-scale composite space truss tested earlier. As a conclusion of this work, two methods for preliminary and final design of composite space trusses are recommended for future use.
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El-Sheikh, Ahmed. "Sensitivity of Space Trusses to Sudden Member Loss." International Journal of Space Structures 12, no. 1 (March 1997): 31–41. http://dx.doi.org/10.1177/026635119701200104.

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Space trusses typically contain a large number of members, and possess a high degree of statical indeterminacy. However, a number of members have been identified as critical to truss integrity, with the loss of any of them likely to produce serious strength reductions. Furthermore, when these members are lost suddenly, e.g. due to the failure of a faulty connection or the buckling of a slender member, their forces are shed into the structure in a dynamic manner, leading to yet more severe damage. This paper presents a numerical study on the sensitivity of space trusses to both gradual and sudden member losses. The effect of composite action between a top concrete slab and a space truss in reducing this sensitivity is assessed. Other factors that are also considered in this work include the truss aspect ratio and supporting condition.
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Luo, Ruifeng, Yifan Wang, Zhiyuan Liu, Weifang Xiao, and Xianzhong Zhao. "A Reinforcement Learning Method for Layout Design of Planar and Spatial Trusses using Kernel Regression." Applied Sciences 12, no. 16 (August 17, 2022): 8227. http://dx.doi.org/10.3390/app12168227.

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Truss layout design aims to find the optimal layout, considering node locations, connection topology between nodes, and cross-sectional areas of connecting bars. The design process of trusses can be represented as a reinforcement learning problem by formulating the optimization task into a Markov Decision Process (MDP). The optimization variables such as node positions need to be transformed into discrete actions in this MDP; however, the common method is to uniformly discretize the design domain by generating a set of candidate actions, which brings dimension explosion problems in spatial truss design. In this paper, a reinforcement learning algorithm is proposed to deal with continuous action spaces in truss layout design problems by using kernel regression. It is a nonparametric regression way to sample the continuous action space and generalize the information about action value between sampled actions and unexplored parts of the action space. As the number of searches increases, the algorithm can gradually increase the candidate action set by appending actions of high confidence value from the continuous action space. The value correlation between actions is mapped by the Gaussian function and Euclidean distance. In this sampling strategy, a modified Confidence Upper Bound formula is proposed to evaluate the heuristics of sampled actions, including both 2D and 3D cases. The proposed algorithm was tested in various layout design problems of planar and spatial trusses. The results indicate that the proposed algorithm has a good performance in finding the truss layout with minimum weight. This implies the validity and efficiency of the established algorithm.
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Yan, Xu, Tie Ying Li, and Yun Jing Nie. "The Construction Process Simulation of a Large-Span Rhombic Space Truss Using FEM Analysis." Advanced Materials Research 368-373 (October 2011): 1101–4. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.1101.

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With the developments of the design theories and the researches, the quantity and the technology of space truss systems in our country have reached the international leading level. In the meantime, the construction methods need to achieve even higher standard. In the article, the rhombic space truss roof of the north station building of Suzhou is selected as the research object. Each step of the sliding and unloading construction is simulated by FEM. The stability and rigidity of the truss are checked in detail. It gives an representative exsample for complicated construction design of large-span space trusses.
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Tabatabaei, Mousa, and Cedric Marsh. "Strengthening Space Trusses by Diagonal Removal." International Journal of Space Structures 8, no. 4 (December 1993): 231–39. http://dx.doi.org/10.1177/026635119300800401.

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Ideally a space truss is composed of bars each of which is suited to the load it carries. In practice, however, it is more convenient to use a limited number of bar sizes, thus only a few of the members will be fully stressed when the maximum load capacity of the space truss is reached. In order to effect a more equitable distribution of forces between chords of equal size such that more chord members are loaded close to their capacity, selected diagonals are removed to control the path followed by the shear forces, and thereby control the forces entering the chords. In this paper the effect of diagonal removal on space trusses is demonstrated and a method for selection of the diagonals whose removal gives optimum increase in the load carrying capacity of a space truss is described.
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Dissertations / Theses on the topic "Space trusse"

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PEREIRA, ANDERSON. "RELIABILITY BASED OPTIMIZATION: APPLICATION TO SPACE TRUSSES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2007. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=10641@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
GRUPO DE TECNOLOGIA DE COMPUTAÇÃO GRÁFICA - PUC-RIO
No projeto de estruturas de engenharia há, freqüentemente, incertezas associadas µas propriedades dos materiais, nas propriedades geométricas e aos carregamentos. A maneira mais comum e tradicional para se levar em conta estas incertezas é através da definição dos valores de projeto como o resultado do produto do valor característico das variáveis aleatórias por um fator parcial de segurança. Esta solução, no entanto, falha ao não permitir a quantificação da confiabilidade do projeto ótimo uma vez que um fator grande de segurança pode não significar uma confiabilidade mais alta. Para se considerar a natureza probabilística de quantidades como propriedades dos materiais, carregamentos, etc., tem-se que identificar e definir estas quantidades como variáveis aleatórias no modelo de análise. Desta maneira, a probabilidade de falha (ou a confiabilidade) de uma estrutura sujeita a uma restrição de desempenho na forma de uma função de estado limite pode, então, ser calculada e formulada como uma restrição num problema de otimização. Neste trabalho, restrição probabilísticas são incorporadas ao esquema tradicional de otimização estrutural. A formulação e os métodos numéricos para este processo, comumente chamado de otimização baseada em confiabilidade, são descritos. O objetivo principal é apresentar um sistema computacional capaz de resolver problemas de otimização de forma e de dimensões de treliças espaciais baseado em confiabilidade. Podem ser consideradas como variáveis, determinísticas ou aleatórias, as seções transversais, as coordenadas nodais, as propriedades dos materiais (módulo de elasticidade e tensão de escoamento) e os carregamentos. De maneira a tratar os problemas de instabilidade global são considerados os efeitos da não-linearidade geométrica no comportamento da estrutura e uma restrição formulada para uma função de estado limite associada na carga de colapso é incluída. Funções de estado limite referentes aos deslocamentos e nas tensões também são consideradas. A flambagem global das barras é considerada por meio da carga crítica de Euler
Uncertainties associated with random variables, such as, the material proprieties and loads, are inherent to the design of structures. These uncertainties are traditionally taken into account in the project before the design by defining design values for the random variables. The design values of the random variables are obtained from statistical properties of the random variables and from partial safety factors. Once these values are defined the variables are treated as deterministic variables in the design process. This approach has been followed in the conventional design optimization and in many design codes such as the Brazilian code for the design of steel and concrete structures. This simple approach, however, does not allow an estimate of the structural reliability of the resulting project which may have a low (unsafe structure) or a very high (expensive structure) reliability. To overcome this problem a reliability analysis must be incorporated into the traditional design optimization. Design optimization, incorporating reliability analyses, has been denoted Reliability-Based Design Optimization (RBDO). In RBDO, the constraints are defined in terms of the probabilities of failure associated with some prescribed failure functions and therefore, it requires, as in the reliability analysis, the definition of the random variables and information about their statistical properties. In this work, RBDO is applied to the shape and sizing optimization of spatial trusses considering geometric nonlinearities. The constraints considered in the RBDO problem are related to the following failure mechanisms: to the global collapse (limit load), to local buckling and yield stress and to serviceability conditions (displacement bounds). The algorithms used for solving the optimization problem and for performing the reliability analysis are described.
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Navarro, Cota Juan Pedro Martin 1963. "DESIGN AND BEHAVIOR OF COMPOSITE SPACE TRUSSES." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276505.

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A fully automated computer program is developed for the optimum design of steel space trusses acting compositely with a concrete slab placed on top. The program sizes the truss members to meet the requirements of the load and resistance factor design specification of the American Institute of Steel Construction using the load combinations of ANSI. Earthquake loading is not considered. The optimum size is based on minimum cost, regarding the amount of welding required at the joints and of the member itself. The total cost is based on all steel work in the truss. Once the truss configuration has been defined, and it has been ensured that linear elastic behavior exists, the structure is analyzed for the construction process, to make sure that no overstressing will take place in any structural element at any time during construction and service. The analysis and design principles are presented and an actual design case is solved. (Abstract shortened with permission of author.)
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Sahol, Hamid Yazmin. "Progressive collapse of double layer space trusses." Thesis, University of Surrey, 2015. http://epubs.surrey.ac.uk/808321/.

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This study deals with the progressive collapse of full scale square-on-square double-layer space truss (DLST) systems. The failure of certain space structures in recent years, ranging from a lattice dome in Romania, Burcharest 1963 to the DLST in Hartford USA, 1978 and the recent collapse of the Sultan Zainal Abidin Stadium, a double-layer space frame constructed in Malaysia, 2009, gives an insight into how sensitive some space structures are to progressive collapse. These tragic incidents have provided very valuable lessons for designers of the importance of understanding progressive collapse in these structural configurations. By understanding what caused such failures engineers may avoid any reoccurrence and in addition help to develop safer structures. Hence, a study of this particular problem has been conducted and the results obtained are presented in the thesis. Evaluation on the consequences of progressive collapse leads to the determination of structural Vulnerability Index due to sudden loss of an individual member (Case 1) or losses of members progressively (Case 2). In order to trace the collapse behavior a nonlinear analysis subject to increasing applied load was used. However, it is difficult for engineers to perform this nonlinear analysis due to its complexity. Hence, a simple linear analysis as an alternative method was used whereby assessment of Vulnerability Index using linear analysis is carried out using two different approaches, i.e. Rate Factor and Probabilistic Approach. Since a DLST has large number of members which correspond to a large data set, hence, these two proposed approaches are suitable. A close statistical correlation between both approaches indicates that there is a high correlation between both approaches. To ensure reliability of the proposed approaches, their results are compared using nonlinear collapse analysis and the results are found to be in good agreement. The solution strategy used to analyse the full scale models was first tested using small scale models. The numerical results of the small scale models have been verified with pre-existing experimental results and good agreements between the results are obtained. Behavior of each DLST member and also the overall structural behavior can be obtained from the nonlinear analysis. There are three different boundary conditions of the DLSTs considered. Vulnerability of the DLSTs susceptible to progressive collapse are identified and then are compared for the identification of efficient structures. The Vulnerability Index of the DLST helps engineers to discover failures that may occur due to damage or loss of its members.
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Nguyen, Thu Ngoc 1967. "Design optimization of a space truss structure." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/46133.

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Mupona, Gaylord Tonderai. "Development of space truss systems in timber." Thesis, University of Cape Town, 2004. http://hdl.handle.net/11427/6712.

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Space trusses are a valuable structural form for architects and structural engineers due mainly to their efficiency in providing large unobstructed areas, associated with faster erection speeds and low maintenance cost. Most space trusses are made of steel and aluminium whilst a few are of timber. Interest is now shifting from the traditional use of timber in plane trusses of relatively short span, to new structural forms for medium to long spans. In adopting such systems in timber for non-traditional roofing applications, the challenge lies in developing structurally sound, visually neat and economically reproducible connectors for 3-dimensional configurations of timber members. The research aimed at developing a new connector for double and triple-layer space grids in timber, intended for medium-span lightweight roofing applications. The origins of the connector date back to 1995, when it was first proposed by Zingoni as the 14FTC-U Timber Space-Truss Connector, and subsequently tested under laboratory conditions over the three years that followed. Unlike connectors for timber space grids proposed by earlier investigators, or the proprietary connector systems that are available for constructions in steel and aluminium, the 14FTC-U connector features a central core of wood in the form of a cuboctahedron or its variants, upon whose faces are attached U-shaped metal brackets that take the timber members. Thus the connector unit is predominantly wood, giving it considerable aesthetic advantages over its all-metal counterparts. While promising, the structural performance of the original connector was not adequate for practical application, hence a programme of further development was embarked upon. As reported in the thesis, the improvements of the connector have culminated in a structurally viable unit that has been successfully employed in a prototype double-layer timber grid.
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Pugh, James Christopher. "A user friendly preprocessor for plane and space frames and space trusses." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/44655.

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A user friendly preprocessor was developed and documented for the plane and space frame and space truss structural analysis programs that are based on the matrix displacements method. This preprocessor is comprised of three programs. The main program in the preprocessor is to allow the user to create error free input data files. This program also allows modifications of existing input data files. The two other programs are the library manager and the graphics presentation. The library manager is used to manage the libraries of the element and material properties. The graphics presentation is used to display a plane structure on the graphics display. In Chapter 2, the development of a user friendly preprocessor is discussed. After a short review of the extension of the analysis program from plane frame to space frame in Chapter 3, the preprocessor and its supporting programs are described in detail in the user manual in Chapter 4. Possible extensions to the preprocessor are discussed in Chapter 5. The appendix contains examples of input data files for these structural analysis programs.


Master of Science
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Parke, Gerard Andrew. "The behaviour of space trusses incorporating novel compression members." Thesis, University of Surrey, 1988. http://epubs.surrey.ac.uk/934/.

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Howells, Hugh Alan. "Collapse behaviour of space trusses with thin-walled members." Thesis, University of Surrey, 1985. http://epubs.surrey.ac.uk/1038/.

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Yates, Keith William. "Optimization of slender space trusses utilizing a continuum model." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-11242009-020159/.

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Andberg, Brent K. "Modal testing and analysis of the NPS Space Truss." Thesis, Monterey, California. Naval Postgraduate School, 1997. http://hdl.handle.net/10945/8683.

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Approved for public release; distribution is unlimited
This thesis deals with modal testing and analysis of the Naval Postgraduate School (NPS) Space Truss. A finite element model (FEM) was developed for the truss using a MATLB program called NRLFEMI (developed at the Nava1 Research Laboratory). Analytical predictions of the natural frequencies for this 3.76 meter by 0.35 meter precision structure were calculated using the NRLFEMI code. These calculated natural frequencies were then compared to experimental data collected during modal testing of the truss in the NPS dynamics and Control Laboratory. Through analysis, the predicted results of the measurements (from the FEM) were satisfactorily correlated to the experimentally obtained results, validating the FEM program. Additionally, a technology demonstration of Fiber Bragg Grating Sensors (FBGSs) was performed. These laser etched, fiber optic sensors are ideally suited for real time evaluation of load, strain, vibration, and other health monitoring functions of structures
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Books on the topic "Space trusse"

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P, Funk Gregory, Dohogne Caroline A, and United States. National Aeronautics and Space Administration., eds. Structural design feasibility study of space station long spacer truss. [Washington, DC: National Aeronautics and Space Administration, 1994.

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W, Smith Suzanne, Javeed Mehzad, and Langley Research Center, eds. Experiments for locating damaged truss members in a truss structure. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1991.

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M, Mikulas Martin, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., eds. Deployable controllable geometry truss beam. [Washington, DC]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1985.

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S, Pappa Richard, and Langley Research Center, eds. Modal identification of a deployable space truss. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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M, Mikulas Martin, and Langley Research Center, eds. Space station truss structures and construction considerations. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1985.

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Schenk, Axel. Modal identification of a deployable space truss. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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Gendy, Atef S. Preliminary analysis and design optimization of the short spacer truss of Space Station Freedom. Cleveland, Ohio: Lewis Research Center, 1993.

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S, Gendy A., and United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., eds. Preliminary analysis and design optimization of the short spacer truss of Space Station Freedom. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1993.

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Sutter, Thomas R. A comparison of two trusses for the space station structure. Hampton, Va: Langley Research Center, 1988.

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Richard, Beacham, and United States. National Aeronautics and Space Administration., eds. Tubular space truss structure for SKITTER II robot. Atlanta, Ga: George W. Woodruff of Mechanical Engineering, Georgia Institute of Technology, 1988.

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Book chapters on the topic "Space trusse"

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Paz, Mario, and William Leigh. "Space Trusses." In Integrated Matrix Analysis of Structures, 221–38. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1611-8_7.

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Podder, Debabrata, and Santanu Chatterjee. "Plane Trusses and Space Trusses." In Introduction to Structural Analysis, 85–120. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003081227-9.

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Ross, C. T. F. "Vibrations of Space Trusses." In Finite Element Programs for Structural Vibrations, 69–75. London: Springer London, 1991. http://dx.doi.org/10.1007/978-1-4471-1886-2_7.

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Ferreira, Antonio J. M., and Nicholas Fantuzzi. "Trusses in 2D Space." In MATLAB Codes for Finite Element Analysis, 57–75. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47952-7_4.

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Ferreira, Antonio J. M., and Nicholas Fantuzzi. "Trusses in 3D Space." In MATLAB Codes for Finite Element Analysis, 77–88. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47952-7_5.

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Rusakov, A. I. "Space Statically Determinate Trusses." In Fundamentals of Structural Mechanics, Dynamics, and Stability, 111–24. First edition. | Boca Raton : CRC Press, 2021.: CRC Press, 2020. http://dx.doi.org/10.1201/9780429155291-15.

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Kattan, Peter I. "The Space Truss Element." In MATLAB Guide to Finite Elements, 91–107. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-70698-4_6.

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Kattan, Peter I. "The Space Truss Element." In MATLAB Guide to Finite Elements, 89–105. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05209-9_6.

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Mustapha, Khameel Bayo. "Plane and Space Truss Elements." In Finite Element Computations in Mechanics with R, 77–122. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, 2018. | “A CRC title, part of the Taylor & Francis imprint, a member of the Taylor & Francis Group, the academic division of T&F Informa plc.”: CRC Press, 2018. http://dx.doi.org/10.1201/b22398-5.

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Hartisch, Michael, Christian Reintjes, Tobias Marx, and Ulf Lorenz. "Robust Topology Optimization of Truss-Like Space Structures." In Lecture Notes in Mechanical Engineering, 296–306. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77256-7_23.

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AbstractDue to the additional design freedom and manufacturing possibilities of additive manufacturing compared to traditional manufacturing, topology optimization via mathematical optimization gained importance in the initial design of complex high-strength lattice structures. We consider robust topology optimization of truss-like space structures with multiple loading scenarios. A typical dimensioning method is to identify and examine a suspected worst-case scenario using experience and component-specific information and to incorporate a factor of safety to hedge against uncertainty. We present a quantified programming model that allows us to specify expected scenarios without having explicit knowledge about worst-case scenarios, as the resulting optimal structure must withstand all specified scenarios individually. This leads to less human misconduct, higher efficiency and, thus, to cost and time savings in the design process. We present three-dimensional space trusses with minimal volume that are stable for up to 100 loading scenarios. Additionally, the effect of demanding a symmetric structure and explicitly limiting the diameter of truss members in the model is discussed.
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Conference papers on the topic "Space trusse"

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Bossens, Frédéric, and André Preumont. "Experiments of Active Tendon Control of Space Trusses." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/movic-8437.

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Abstract After a brief review of the strategy for damping cable structures with active tendons and a summary of the linear theory allowing to predict the closed-loop poles with a root locus technique, the paper presents experimental results obtained with two trusses. The first one is an active truss, clamped at its base and equipped with three guyed cables with active tendons; the second one is a free floating truss of geometry similar to the JPL Micro-Precision Interferometer; the three elementary trusses are connected by cables with active tendons. The experimental results tend to confirm the root locus predictions of the closed-loop poles.
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de Castro, Carlos Henrique L., Paulo B. Gonçalves, and Diego Orlando. "Nonlinear Vibrations and Instability of Shallow Pyramidal Trusses." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46039.

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Pyramidal space trusses are a basic component of several structures, from carbon nanostructures to large geodesic domes. These structures, such as the classical Von Mises truss, have a highly non-linear response in the presence of static and dynamic loads. The geometric nonlinearity is particularly significant, even at low load levels when these structures are shallow, that is, has a small height to base ratio. This paper presents an exact non-linear formulation for a shallow pyramidal truss composed of n equally spaced bars. Based on this formulation, the loss of stability and nonlinear vibrations of these structures under static and dynamic loads is analyzed. To understand its nonlinear behavior, time responses, phase portraits, bifurcation diagrams, energy profiles and basins of attraction are obtained. The results highlight the complex nonlinear dynamics of this class of structures and its major influence in design.
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Soper, R. Randall, Charles F. Reinholtz, Stephen L. Canfield, and Robert L. Williams. "Contention-Free Control of Over-Constrained Variable Geometry Trusses." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/dac-8668.

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Abstract A unified velocity analysis approach for Variable Geometry Trusses (VGTs) is employed to develop a direct strategy for actuator contention avoidance in over-constrained architectures. Techniques of matrix theory are used to meet all boundary and structural constraints simultaneously. The null-space of a square matrix of dimension equal to the number of actuators forms a basis for contention-free trajectories. Further, the unified velocity analysis procedure, is modified to improve efficiency in the case of open serial chains of truss-type or truss-like manipulators. When applied to over-constrained architectures, an iterative velocity analysis procedure results.
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Mahadevan, Sankaran, and Prakash Raghothamachar. "Reliability Analysis of Space Trusses." In Seventh International Conference and Exposition on Engineering, Construction, Operations, and Business in Space. Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40479(204)42.

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Jacobson, Mindy, Wayne Chen, Benjamin Rodini, Yury Flom, and Alan Posey. "Space Based Truss Design for Demise Using Graphite Epoxy and Metal Matrix Composites." In Space 2005. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-6804.

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RIEL, F., and L. MORATA. "Space Station Freedom pre-integrated truss configuration." In Space Programs and Technologies Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1992. http://dx.doi.org/10.2514/6.1992-1308.

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Murphey, Thomas W., Daniel J. Hunt, and Timothy Hunt. "Tubular Truss In Space Manufacturing." In ASCEND 2021. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2021. http://dx.doi.org/10.2514/6.2021-4166.

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Mikulas, Martin M. "Truss Performance and Packaging Metrics." In SPACE TECH.& APPLIC.INT.FORUM-STAIF 2006: 10th Conf Thermophys Applic Microgravity; 23rd Symp Space Nucl Pwr & Propulsion; 4th Conf Human/Robotic Tech & Nat'l Vision for Space Explor.; 4th Symp Space Coloniz.; 3rd Symp on New Frontiers & Future Concepts. AIP, 2006. http://dx.doi.org/10.1063/1.2169281.

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Jenett, Benjamin, Daniel Cellucci, and Kenneth Cheung. "SpRoUTS (Space Robot Universal Truss System): Reversible Robotic Assembly of Deployable Truss Structures of Reconfigurable Length." In AIAA SPACE 2015 Conference and Exposition. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2015. http://dx.doi.org/10.2514/6.2015-4539.

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Rakshit, Sourav, and G. K. Ananthasuresh. "Simultaneous Geometry Optimization and Material Selection for Truss Structures." In ASME 2006 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/detc2006-99349.

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In this work, we explore simultaneous design and material selection by posing it as an optimization problem. The underlying principles for our approach are Ashby’s material selection procedure and structural optimization. For the simplicity and ease of initial implementation of the general procedure, truss structures under static load are considered in this work in view of maximum stiffness, minimum weight/cost and safety against failure. Along the lines of Ashby’s material indices, a new design index is derived for trusses. This helps in choosing the most suitable material for any design of a truss. Using this, both the design space and material database are searched simultaneously using optimization algorithms. The important feature of our approach is that the formulated optimization problem is continuous even though the material selection is an inherently discrete problem.
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Reports on the topic "Space trusse"

1

Swanson, Andrew D., Wayne Yuen, and John R. Mackaman. Space Truss Zero Gravity Dynamics. Fort Belvoir, VA: Defense Technical Information Center, March 1993. http://dx.doi.org/10.21236/ada266130.

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SOLOVYANENKO, N. I. CROSS-BORDER BUSINESS OPERATIONS IN DIGITAL ECOSYSTEMS OF THE EAEU: LEGAL ISSUES. DOI CODE, 2021. http://dx.doi.org/10.18411/0131-5226-2021-70003.

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Cross-border business operations in the digital ecosystems of the EAEU are carried out using electronic document management and the legal structure of the cross-border space of trust. Within the framework of the cross-border trust space, the legal structure of a trusted third party is used, which identifies participants in the electronic document flow; signs an electronic document with an electronic signature and verifies it; registers the date and time of sending and receiving an electronic document; and stores electronic documents. Special legal constructions are used to ensure the reliability of electronic document management.
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Clausen, Jay, D. Moore, L. Cain, and K. Malinowski. VI preferential pathways : rule or exception. Engineer Research and Development Center (U.S.), July 2021. http://dx.doi.org/10.21079/11681/41305.

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Trichloroethylene (TCE) releases from leaks and spills next to a large government building occurred over several decades with the most recent event occurring 20 years ago. In response to a perceived conventional vapor intrusion (VI) issue a sub-slab depressurization system (SSDS) was installed 6 years ago. The SSDS is operating within design limits and has achieved building TCE vapor concentration reductions. However, subsequent periodic TCE vapor spikes based on daily HAPSITE™ measurements indicate additional source(s). Two rounds of smoke tests conducted in 2017 and 2018 involved introduction of smoke into a sanitary sewer and storm drain manholes located on effluent lines coming from the building until smoke was observed exiting system vents on the roof. Smoke testing revealed many leaks in both the storm sewer and sanitary sewer systems within the building. Sleuthing of the VI source term using a portable HAPSITE™ indicate elevated vapor TCE levels correspond with observed smoke emanation from utility lines. In some instances, smoke odors were perceived but no leak or suspect pipe was identified suggesting the odor originates from an unidentified pipe located behind or enclosed in a wall. Sleuthing activities also found building roof materials explain some of the elevated TCE levels on the 2nd floor. A relationship was found between TCE concentrations in the roof truss area, plenum space above 2nd floor offices, and breathing zone of 2nd floor offices. Installation of an external blower in the roof truss space has greatly reduced TCE levels in the plenum and office spaces. Preferential VI pathways and unexpected source terms may be overlooked mechanisms as compared to conventional VI.
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Zucker, Lynne, and Michael Darby. Social Construction of Trust to Protect Ideas and Data in Space Science and Geophysics. Cambridge, MA: National Bureau of Economic Research, December 1995. http://dx.doi.org/10.3386/w5373.

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Maydykovskiy, Igor, and Petra Užpelkis. The Concept of space-time quanta in future technologies. Intellectual Archive, December 2020. http://dx.doi.org/10.32370/iaj.2464.

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The article discusses the possibility of using the technological advantages that appear in connection with the discovery of the physical essence of Time and new interpretation of the structure of space in the form of space-time quanta. One of the problems that can be successfully solved on the basis of the new physical model is the problem of establishing the true nature of gravity. The solution to this problem is directly related to the implementation of the idea of unsupported motion based on the interaction in a certain way of the created asymmetric interference structure of longitudinal waves with the natural structure of spatial frequencies.
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Abed, Dana, Rihab Sawaya, and Nadim Tabbal. Analyzing Voter Turnout in Lebanon: Political Change in Times of Crisis. Oxfam, April 2022. http://dx.doi.org/10.21201/2022.8823.

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In May 2022, Lebanon is hosting its first parliamentary elections since the popular uprising of October 2019, when massive protests took place to denounce the current ruling elites. This research looks at voter turnout and behavior on the eve of the elections and examines the will for political change. It argues that in the current Lebanese context, there needs to be further political awareness-raising, and campaigns should be more inclusive of women and the queer community. Independent campaigns should focus on developing strong governing capacities that voters can trust, and create further space for civic and political engagement on the local and national levels.
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Southwell, Brian, Angelique (Angel) Hedberg, Christopher Krebs, and Stephanie Zevitas, eds. Building and Maintaining Trust in Science: Paths Forward for Innovations by Nonprofits and Funding Organizations. RTI Press, September 2019. http://dx.doi.org/10.3768/rtipress.2019.cp.0010.1909.

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In July 2019, participants gathered in Research Triangle Park, North Carolina, for an event organized by RTI International called Trust in Science. Our goal with the Trust in Science event was to foster collaborations and strengthen connections between nonprofit and funding organizations to address trust-related challenges that are affecting science and scientists. Collaboration between professionals and organizations is easy to cite as an abstract goal but can be challenging to pursue in practice for various reasons. Participants generated and considered both broad challenges and specific contexts in which trust has been strained. We discussed, for example, the use of wearable technologies for data collection, vaccine acceptance, biofuel research, survey research on topics such as sexual harassment monitoring, tools to help people navigate online information, and the development of physical spaces for local community discussion about science and technology. We offer an overview of key themes and ideas that emerged from our interactions. We hope that readers will consider this an open-source set of suggestions for future initiatives and innovations.
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Hammond, Kay, and Catherine Powell. Entry-level tertiary student perceptions of challenges when using a wiki: Trust and peer teaching. Unitec ePress, September 2017. http://dx.doi.org/10.34074/ocds.12017.

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Wikis are widely used in blended learning educational settings with varying degrees of success. Scholarly attention increasingly regards student perceptions and experiences of using wikis as part of ongoing development. Students in entry-level education often belong to high-needs target groups who particularly require positive experiences for a successful transition into tertiary education. This paper reports action research exploring the use of a wiki by certificate-level students at a tertiary institution. The results showed most students did not engage with the wiki. Qualitative student feedback revealed valuable insight into two major social challenges when interacting online: trust and difficulties with peer-teaching. Recommendations are made regarding these social challenges that should be considered by educators aiming to use a wiki or other collaborative online learning and teaching spaces for entry-level education.
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Ihsan, Yilmaz, and Raja Ali M. Saleem. The nexus of religious populism and digital authoritarianism in Pakistan. European Center for Populism Studies (ECPS), December 2022. http://dx.doi.org/10.55271/pp0016.

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Pakistan has a turbulent political history. In the seven decades since its creation, the country has faced four military-led dictatorships and another two decades under indirect military rule. Given this political trend, authoritarianism is not a novel phenomenon in the country. Digital authoritarianism, however, is a relatively new domain of oppression. This paper looks at how a political party in power and the “establishment” (military elite and its civilian collaborators) have been increasing the control of digital mediums as well as weaponizing space. This dual control and usage allow for growing digital authoritarianism. Using the case study of Imran Khan’s government (2018-2022) and its collaboration with the military establishment in enforcing digital authoritarianism, this article uses four levels of an assessment of internet governance in Pakistan (whole network level, sub-network level, proxy level, and user level). In addition, the role of Khan’s political party’s Islamist populist outlook in contributing to authoritarianism is also discussed. A lot of censorship happens around ideas of protecting Islam and Pakistan’s Muslim identity. The review also finds that the establishment uses not only religion but also ultra-nationalism and fears of foreign attacks, primarily by “Hindu” India, as means to closely surveil and curb the rights of citizens which it deems not worthy of trust. Our results find that Pakistan’s digital space is highly oppressive where ideas of religion, ontological insecurity, and nationalism are weaponized to legitimize the state’s growing authoritarianism.
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Clausen, Jay, D. Moore, K. Miller, and L. Haines-Ecklund. VI preferential pathways of a large government building. Engineer Research and Development Center (U.S.), February 2022. http://dx.doi.org/10.21079/11681/43260.

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Trichloroethylene (TCE) releases from leaks and spills next to a large government building occurred over several decades with the most recent event occurring 20 years ago. In response to a perceived conventional vapor intrusion (VI) issue a sub-slab depressurization system (SSDS) was installed 6 years ago. The SSDS is operating within design limits and has achieved building TCE vapor concentration reductions. However, subsequent periodic TCE vapor spikes based on daily HAPSITE™ measurements indicate additional source(s). Two rounds of smoke tests conducted in 2017 and 2018 involved introduction of smoke into a sanitary sewer and storm drain manholes located on effluent lines coming from the building until smoke was observed exiting system vents on the roof. Smoke testing revealed many leaks in both the storm sewer and sanitary sewer systems within the building. Sleuthing of the VI source term using a portable HAPSITE™ indicate elevated vapor TCE levels correspond with observed smoke emanation from utility lines. Sleuthing activities also found building roof materials explain some of the elevated TCE levels on the 2nd floor. Installation of an external blower in the roof truss space has greatly reduced TCE levels. Preferential VI pathways and unexpected source terms may be overlooked mechanisms as compared to conventional VI.
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