1,720,981 research outputs found
Computational Design Methods Comparison for the Optimization of Variable Section Continuous Beams
Full text linkIn recent years, novel computational tools such as generative or parametric design revolutionized the existing approaches to architecture and engineering, substantially affecting and also improving the structural optimization field. This latter can be formally conceived as three different sub-problems, thus involving size optimization, shape optimization, and topology optimization. In this study, the authors mainly focused on solving joint size and shape optimization problems for a continuous variable section simply supported beam domain by comparing the optimization precision obtained among two different computational design methodologies. The former method relies on visual programming parametric design based on Grasshopper software, whilst the second approach is based on the analytical resolution of the multi-domain beam's differential equations directly implemented in MATLAB software. The presented case study refers to Mitsutani and da Rocha's Japan pavilion for the Expo event of 1970 held in Osaka City. This structure today does not exist anymore since it was dismantled and demolished. This was a reference benchmark in the architectural field characterized by an optimized shape with circular soffit geometry at constant curvature. The achieved optimization outcomes synthesize the benefits of controlling the architectural elements whilst improving the efficiency and stability of the proposed conceptual design
Ordered superstructures at organic/inorganic interfaces by equilibrium and out-of-equilibrium processes
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Instability induced ordered structures during the transfer of a Langmuir-Blodgett monolayer: an experimental and theoretical study
No full textDAMAGING CONFIGURATIONS IN ARCH STRUCTURES WITH VARIABLE CURVATURE AND TAPERED CROSS-SECTION
Full text linkArch structure is a widely used and important structure type all over the World. Due to its beautiful form and large spanning capacity, arch structure is widely used in bridges, tunnels and other buildings. Recently, the large span space arch structure has a stage of development. The defects of arch structure, such as connection, material, fatigue, stress concentration and welding, will directly affect the safety of these kind of structures. The study of the evolution of the damage in arches is a topic of interest since the antiquity. A well-done structural design should always account for the evolution of the damage in time, in particular if it can bring to a change in the static behaviour of the structure itself under different loading conditions. In this paper, a model for the calculation of localized damaged in arch structures is presented. In particular, using an analytical solution for the computation of the displacements field and the consequent internal actions of very general shapes with variable curvature and tapered cross-section, the damage is modelled by localized depletion of the cross-sectional properties (inertia) in the different points along the arch axis. Moreover, the depleted parameters are the cross-section and the bending stiffness of the arch. The model is applied to the study different configurations of the damage (localization of plastic hinges or different pattern of defects) and to consider the evolution of the damage in time
MULTI-BODY ROPE APPROACH FOR THE FORM-FINDING OF SHAPE OPTIMIZED GRID SHELL STRUCTURES
Full text linkOver the past decades, different approaches, physical and geometrical, were implemented to identify the optimal shape, reducing the internal stresses, of grid shells and vaults. As far as their original organic shape is concerned, the design of grid shell structures inspired architects and structural engineers worldwide and in any time. The method, here presented, is developed and extended, from its original formulation, employing a self-made code based on the dynamic equilibrium, ensured by the d'Alembert principle, of masses interconnected by rope elements in the space-time domain. The equilibrium corresponding the optimized shape to be defined, is obtained through an iterative process in the falling masses connected by a net for the definition of the "catenary surface" coinciding with the best shape of the shell (form minimizing the bending moment) according to the conditions of zero velocities and accelerations of the nodes. The implementation of the method is realized in MATLAB and set up for Python in an interpreted high-level general-purpose programming language. By the use of this code as well as its object-oriented architecture the MRA Python code will be linked to the Grasshopper environment for the direct visualization of the shapes and their fast-parametrization phase
Parametric design: Formal and structural connection for a pedestrian bridge in the archaeological area of Roca Vecchia (IT)
No full textThe work done, lays the foundations for a design methodology that connects the formal and structural aspects of an architecture passing through the parametrization of geometric shapes. To carry out the steps of the design method, the design of a steel pedestrian bridge was experimented. The analysis of the structure made use of the AutoDesk Structural Analysis Robot calculation software; the geometry was parameterised using the AutoDesk Dynamo Studio software (Robot plug-in). The architectural design was carried out using the aforementioned softwares, managing to connect the formal and the structural part of the project, reaching a focus on the forms of architecture that directly influence the structural functionality
Parametric design: Formal and structural connection for a pedestrian bridge inin the archaeological area of roca vecchia (it)
No full textThe work done, lays the foundations for a design methodology that connects the formal and structural aspects of an architecture passing through the parametrization of geometric shapes. To carry out the steps of the design method, the design of a steel pedestrian bridge was experimented. The analysis of the structure made use of the AutoDesk Structural Analysis Robot calculation software; the geometry was parameterised using the AutoDesk Dynamo Studio software (Robot plug-in). The architectural design was carried out using the aforementioned softwares, managing to connect the formal and the structural part of the project, reaching a focus on the forms of architecture that directly influence the structural functionality
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