Journal of the International Association for Shell and Spatial Structures最新文献_第8页

A Pavilion Made from Scrap Acrylic and Physically Form-Found at Full Scale 一个由废旧亚克力和物理形式制成的展馆

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Journal of the International Association for Shell and Spatial Structures Pub Date : 2021-01-01 DOI: 10.20898/J.IASS.2021.002

E. M. Segal, Albert Chao, Lisa Ramsburg, P. Draper

引用次数: 0

Adaptive Framework for Structural Pattern Optimization 结构模式优化的自适应框架

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Journal of the International Association for Shell and Spatial Structures Pub Date : 2020-12-01 DOI: 10.20898/J.IASS.2020.012

Diego Rivera, Renaud Danhaive, C. Mueller

{"title":"Adaptive Framework for Structural Pattern Optimization","authors":"Diego Rivera, Renaud Danhaive, C. Mueller","doi":"10.20898/J.IASS.2020.012","DOIUrl":"https://doi.org/10.20898/J.IASS.2020.012","url":null,"abstract":"This research outlines a new computational workflow for the design and optimization of patterned, perforated surface structures. Well-designed surface structures can be highly efficient on their own, but their potential for structural efficiency can be notably improved by deliberately\u0000 introducing specific aperture patterns. Patterned surfaces can also be used to produce more stimulating architectural environments, and even those of increasing complexity can be realized thanks to recent developments in digital fabrication. With this said, designers currently lack a streamlined\u0000 and rigorous approach for the exploration of patterned surface structures. This research aims to address this issue by advancing a recent work that employs NURBS-based isogeometric analysis to integrate structural analysis into an accessible CAD modeling platform. Specifically, this paper\u0000 proposes an adaptive pattern optimization framework formulated to save designers appreciable computational time. Not only does this framework offer a way to quickly visualize various design solutions, but it also provides the designer an important opportunity for design interaction and control\u0000 over design evolution, in turn lending itself as a versatile tool for the exploration and conceptual design of patterned surface structures.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":"7 1","pages":"296-306"},"PeriodicalIF":0.8,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79121375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Voss Surfaces: A Design Space for Geodesic Gridshells Voss曲面:测地线网格壳的设计空间

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Journal of the International Association for Shell and Spatial Structures Pub Date : 2020-12-01 DOI: 10.20898/J.IASS.2020.008

N. Montagné, C. Douthe, X. Tellier, C. Fivet, O. Baverel

{"title":"Voss Surfaces: A Design Space for Geodesic Gridshells","authors":"N. Montagné, C. Douthe, X. Tellier, C. Fivet, O. Baverel","doi":"10.20898/J.IASS.2020.008","DOIUrl":"https://doi.org/10.20898/J.IASS.2020.008","url":null,"abstract":"The design of envelopes with complex geometries often leads to construction challenges. To overcome these difficulties, resorting to discrete differential geometry proved successful by establishing close links between mesh properties and the existence of good fabrication, assembling\u0000 and mechanical properties. In this paper, the design of a special family of structures, called geodesic shells, is addressed using Voss nets, a family of discrete surfaces. The use of discrete Voss surfaces ensures that the structure can be built from simply connected, initially straight laths,\u0000 and covered with flat panels. These advantageous constructive properties arise from the existence of a conjugate network of geodesic curves on the underlying smooth surface. Here, a review of Voss nets is presented and particular attention is given to the projection of normal vectors on the\u0000 unit sphere. This projection, called Gauss map, creates a dual net which unveils the remarkable characteristics of Voss nets. Then, based on the previous study, two generation methods are introduced. One enables the exploration and the deformation of Voss nets while the second provides a more\u0000 direct computational technique. The application of theses methodologies is discussed alongside formal examples.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":"97 1","pages":"255-263"},"PeriodicalIF":0.8,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80552419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Parametric Study of Non-periodic and Hybrid Auxetic Bending-Active Gridshells 非周期和混合抗弯主动网格壳的参数化研究

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Journal of the International Association for Shell and Spatial Structures Pub Date : 2020-12-01 DOI: 10.20898/J.IASS.2020.010

Y. Sakai, M. Ohsaki

{"title":"Parametric Study of Non-periodic and Hybrid Auxetic Bending-Active Gridshells","authors":"Y. Sakai, M. Ohsaki","doi":"10.20898/J.IASS.2020.010","DOIUrl":"https://doi.org/10.20898/J.IASS.2020.010","url":null,"abstract":"This paper presents a design method of Auxetic Bending-Active Gridshells (ABAGs), which are curved surfaces generated from the initial flat grid with 2-dimensional auxetic patterns. One of the mechanical properties of ABAGs is that a dome-like shape of a curved surface can be easily\u0000 obtained by bending a grid due to negative Poisson's ratio for in-plane deformation. Shapes of auxetic patterns are relevant to Poisson's ratio. Non-periodic and/or hybrid 2-dimensional auxetic patterns are developed for designing the initial flat grid of ABAGs. Shape parameters are the sizes\u0000 of each plane unit for tuning its reentrant pattern, and two types of reentrant shapes are mixed on an initial flat grid. Using the non-uniform patterns, we can obtain an asymmetric and more complex free-form surface of ABAGs than those composed of a uniform reentrant pattern. Discrete Gaussian\u0000 curvature at each node on a curved surface is computed for quantitatively evaluating the properties of shapes of the obtained surfaces. Possibility of ABAGs as a new design tool is demonstrated by showing that various shapes are generated through large deformation analysis with the forced\u0000 displacements at the supports.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":"34 1","pages":"275-284"},"PeriodicalIF":0.8,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77540694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A Graphical Method for Determining Truss Stability 确定桁架稳定性的图解法

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Journal of the International Association for Shell and Spatial Structures Pub Date : 2020-12-01 DOI: 10.20898/J.IASS.2020.011

A. McRobie, Cameron Millar, W. Baker

{"title":"A Graphical Method for Determining Truss Stability","authors":"A. McRobie, Cameron Millar, W. Baker","doi":"10.20898/J.IASS.2020.011","DOIUrl":"https://doi.org/10.20898/J.IASS.2020.011","url":null,"abstract":"Graphic statics has been used for over 150 years, having been pioneered by the likes of Maxwell, Cremona, Culmann and Rankine, and has recently seen a resurgence in popularity because of its use in design. However, it is only concerned with equilibrium; as any engineer will testify,\u0000 whilst equilibrium is necessary, it is not sufficient and stability must also be obtained. This paper develops a novel graphical method for determining the stability and stiffness of prestressable structures. By considering the weighted sum of the Maxwell-Minkowski diagram, the stiffness and\u0000 stability of the structural mechanisms can be determined. This work extends to cover structures with multiple mechanisms and has been compared to results obtained through experimentation and the finite element method. Furthermore, it extends the work on stiffness to provide a graphical method\u0000 to estimate the natural frequency of a truss. Whilst this method accurately determines the stiffness of structures, it represents a significant development in the field of graphic statics as it allows an engineer to 'eye-ball' the stability of a given truss. Engineers can also manipulate the\u0000 form and force diagrams, as desired, to adjust the stiffness of their structure accordingly, whilst being able to visualise the process. Much of the previous work in this area relies heavily upon large matrices, while this method allows a more intimate and hands-on alternative.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":"45 1","pages":"285-295"},"PeriodicalIF":0.8,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77267312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Coupled Sizing, Shape and Topology Optimisation of Bistable Deployable Structures 双稳态可展开结构的尺寸、形状和拓扑耦合优化

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Journal of the International Association for Shell and Spatial Structures Pub Date : 2020-12-01 DOI: 10.20898/J.IASS.2020.009

L.I.W. Arnouts, T. Massart, N. D. Temmerman, P. Berke

{"title":"Coupled Sizing, Shape and Topology Optimisation of Bistable Deployable Structures","authors":"L.I.W. Arnouts, T. Massart, N. D. Temmerman, P. Berke","doi":"10.20898/J.IASS.2020.009","DOIUrl":"https://doi.org/10.20898/J.IASS.2020.009","url":null,"abstract":"Bistable scissor structures, consisting of beams connected by hinges, are transportable and can be transformed from a compact to a deployed configuration. Geometric incompatibilities can be introduced during transformation to obtain a bistable structural response which enforces some\u0000 instantaneous structural stability in the deployed state. The design of bistable scissor structures requires assessing both the non-linear transformation behaviour, as well as the service state, since a proper structural design has to provide stiffness in the deployed state as well as flexibility\u0000 during transformation. These contradicting requirements were formulated previously in Arnouts et al. [1] as a multi-objective shape and sizing optimisation (SSO). The originality of this contribution is the elaboration of a design methodology coupling a novel topology optimisation (TO) to\u0000 SSO and demonstrating its performance for the design of a bistable deployable wall. In this novel step, the number of bistable deployable modules (BDM) of the structure is optimised at low computational cost by finding the location of BDM, yielding mixed structures composed of BDM and non-bistable\u0000 modules (NBDM) of lower weight and complexity than structures entirely built from BDM. TO is incorporated and assessed in the design methodology prior or subsequent to the SSO step. It is shown that the mixed structures combining BDM and NBDM resulting from the new coupled TO-SSO approach\u0000 outperform pure BDM based structures.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46014705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Tendon Geometry Optimization Using Path Integrals 使用路径积分的肌腱几何优化

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Journal of the International Association for Shell and Spatial Structures Pub Date : 2020-12-01 DOI: 10.20898/J.IASS.2020.007

Jack Lehrecke, Juan Pablo Osman-Letelier, M. Schlaich

引用次数: 1

Necessary Height of the Vertical Stiffeners in Steel Silos on Discrete Supports with Accounting of Imperfections 考虑缺陷的离散支撑筒仓垂直加强筋必要高度

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Journal of the International Association for Shell and Spatial Structures Pub Date : 2020-09-01 DOI: 10.20898/j.iass.2020.002

Lyubomir A. Zdravkov

{"title":"Necessary Height of the Vertical Stiffeners in Steel Silos on Discrete Supports with Accounting of Imperfections","authors":"Lyubomir A. Zdravkov","doi":"10.20898/j.iass.2020.002","DOIUrl":"https://doi.org/10.20898/j.iass.2020.002","url":null,"abstract":"To ensure unloading of the whole amount of stored product by gravity, the steel silos are often placed on supporting frame structure. The values of stresses in the joints between the thin shell and supporting frame elements are extremely high. It can cause local loss of stability in\u0000 the shell. To prevent it, many designers place stiffening elements above the supports. Here the question is how high should be the stiffening elements? The appropriate solution is that they should rise to that level till which the values of meridional normal stresses above the supports and\u0000 in the middle between them are equalized. But where is this level? Many researchers worked on values and ways of distribution of normal meridional stresses above the supports of the cylindrical shells. As a result of their efforts are determined critical height Hcr of the\u0000 shell and the ideal position HI of intermediate stiffening ring. But these heights are considerably different between each other. To which of them our vertical stiffening elements should achieve? Considering the nonlinear behaviour of the steel, the effects of changes in\u0000 geometry during loading and imperfections caused by welding works, the author tried to obtain an answer to this question.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":"31 1","pages":"201-210"},"PeriodicalIF":0.8,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90971573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of Load Factor to Be Applied in Buckling Design of Cylindrical Lattice Shells Under Asymmetric Snow Load 非对称雪荷载作用下圆柱格壳屈曲设计的荷载系数评估

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Journal of the International Association for Shell and Spatial Structures Pub Date : 2020-09-01 DOI: 10.20898/j.iass.2020.005

S. Kato, Yutaka Niho

{"title":"Evaluation of Load Factor to Be Applied in Buckling Design of Cylindrical Lattice Shells Under Asymmetric Snow Load","authors":"S. Kato, Yutaka Niho","doi":"10.20898/j.iass.2020.005","DOIUrl":"https://doi.org/10.20898/j.iass.2020.005","url":null,"abstract":"The load factor is one of the keys in anti-buckling design for safety together for construction cost, and studies have been becoming demanded in a recent situation that super large and super light spatial structures have been constructed. This paper investigates the relationship between\u0000 reliability index β and snow load factor γs for anti-buckling design of a simply supported cylindrical lattice shell roof under simultaneous action of both dead load and asymmetric snow load. The cylindrical lattice shell analyzed is composed of an equilateral triangle\u0000 grid of which members are of steel circular hollow sections. Members are connected rigidly to nodes at their both ends. The snow distribution as a main target is assumed in a way that the snow depth on the half of the arch-like roof is half of the amount on the other half roof. The snow fall\u0000 depth is here assumed 50cm evaluated as 100-year return period, and its probability is assumed as Gumbel distribution with 100-year reference period. The probability distribution of buckling strength Pcr including geometrical and material nonlinearities is approximately evaluated\u0000 based on a first-order perturbation. The reliability is calculated based on AFOSM, and the relationship in a form of β to γs is finally expressed for design use.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":"21 1","pages":"211-226"},"PeriodicalIF":0.8,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82271626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Airplane Hangars of Pier Luigi Nervi: Digital and Scaled Models Pier Luigi Nervi的飞机机库:数字和比例模型

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Journal of the International Association for Shell and Spatial Structures Pub Date : 2020-09-01 DOI: 10.20898/j.iass.2020.004

G. Barazzetta, E. Mossa, C. Poggi, M. Simoncelli

{"title":"The Airplane Hangars of Pier Luigi Nervi: Digital and Scaled Models","authors":"G. Barazzetta, E. Mossa, C. Poggi, M. Simoncelli","doi":"10.20898/j.iass.2020.004","DOIUrl":"https://doi.org/10.20898/j.iass.2020.004","url":null,"abstract":"The paper presents a complete study of the work done by Pier Luigi Nervi for the design and construction of a series of concrete hangars between 1935 and 1940. This research is enclosed in the framework of the exhibition entitled \"Pier Luigi Nervi, il modello come strumento di\u0000 progetto e costruzione\" that gathers researches from Università degli Studi di Bologna, Università di Roma Tor Vergata and Politecnico di Milano. The exhibition was used as a starting point for a general discussion about the meaning of the logical passage that leads engineers\u0000 and architects from physical scaled models to numerical structural models. The Politecnico di Milano contributed to re-writing the first experiences of Pier Luigi Nervi and Arturo Danusso in the structural modeling. Scaled models, nowadays substituted by finite element methods, were widely\u0000 used in the past, for the understanding of the structural behavior of complex structures. Unfortunately, many of these masterpieces have been destroyed during the years (as happened to the two original models tested by Pier Luigi Nervi and reproduced for the exhibition). In the\u0000 last part of the paper, based on numerical results, the structural behavior of these hangars is deeply discussed, underlining all the principal strengths and weaknesses of these complex structures.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":"51 1","pages":"187-200"},"PeriodicalIF":0.8,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91218544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2