Pub Date : 2023-06-01DOI: 10.20898/j.iass.2023.006
J. Fujiwara, Yuki Terazawa, A. Kishida, K. Nishimura, T. Yamashita, Tomohiko Kumagai, T. Takeuchi
The transverse out-of-plane response of the RC moment frame on the arena floor damaged a school gymnasium that was expected to function as a natural disaster shelter. It was composed of heavy RC substructure and a light steel roof, which partially collapsed, resulting in the facility's permanent destruction in the 2016 Kumamoto earthquake. This study describes scaled shaking table tests that simulate out-of-plane response-induced damage to the RC moment frame of the school gymnasium during the 2016 Kumamoto earthquake and verifies the damage mechanism proposed by the previous numerical simulation and the efficiency of a response control by the friction damper support. Furthermore, the study validates two methods for evaluating the response of the RC moment frame and the overall buckling strength of the roof truss member with semi-rigid joints.
{"title":"Scaled Shaking Table Tests Simulating the Damage of the School Gymnasium in the 2016 Kumamoto Earthquake","authors":"J. Fujiwara, Yuki Terazawa, A. Kishida, K. Nishimura, T. Yamashita, Tomohiko Kumagai, T. Takeuchi","doi":"10.20898/j.iass.2023.006","DOIUrl":"https://doi.org/10.20898/j.iass.2023.006","url":null,"abstract":"The transverse out-of-plane response of the RC moment frame on the arena floor damaged a school gymnasium that was expected to function as a natural disaster shelter. It was composed of heavy RC substructure and a light steel roof, which partially collapsed, resulting in the facility's\u0000 permanent destruction in the 2016 Kumamoto earthquake. This study describes scaled shaking table tests that simulate out-of-plane response-induced damage to the RC moment frame of the school gymnasium during the 2016 Kumamoto earthquake and verifies the damage mechanism proposed by the previous\u0000 numerical simulation and the efficiency of a response control by the friction damper support. Furthermore, the study validates two methods for evaluating the response of the RC moment frame and the overall buckling strength of the roof truss member with semi-rigid joints.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44934547","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}
Pub Date : 2023-06-01DOI: 10.20898/j.iass.2023.010
S. Yoshinaka, K. Kawaguchi, J. Fujiwara, A. Kishida, M. Yamakawa
additional-mass-type vibration-control devices, especially TMDs, and confirm their control performance under seismic loadings by both analytical and experimental methods. Firstly, to effectively control spatial structures that have different vibration properties than multi-story frame structures, we propose a spatially distributed MTMD method. This method is characterized by controlling plural modes with closely spaced natural frequencies based on the robust property of the MTMD against variation of natural frequencies. Next, we propose a TMD-with-initial-displacement method to improve transient response. Then, we describe a shaking table test using TMD models and compare test results and analytical results. Lastly, we describe a method of applying a Houde damper system through a real construction project; the Eye of the Yellow Sea Pedestrian Bridge.
{"title":"Vibration Control of Metal Spatial Structures With Tuned Mass Dampers","authors":"S. Yoshinaka, K. Kawaguchi, J. Fujiwara, A. Kishida, M. Yamakawa","doi":"10.20898/j.iass.2023.010","DOIUrl":"https://doi.org/10.20898/j.iass.2023.010","url":null,"abstract":"additional-mass-type vibration-control devices, especially TMDs, and confirm their control performance under seismic loadings by both analytical and experimental methods. Firstly, to effectively control spatial structures that have different vibration properties than multi-story frame\u0000 structures, we propose a spatially distributed MTMD method. This method is characterized by controlling plural modes with closely spaced natural frequencies based on the robust property of the MTMD against variation of natural frequencies. Next, we propose a TMD-with-initial-displacement method\u0000 to improve transient response. Then, we describe a shaking table test using TMD models and compare test results and analytical results. Lastly, we describe a method of applying a Houde damper system through a real construction project; the Eye of the Yellow Sea Pedestrian Bridge.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46252220","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}
Pub Date : 2023-01-01DOI: 10.20898/j.iass.2023.003
Heather Gathman, Ann C. Sychterz
Tensegrity structures are typically composed of bars and cables held together in a state of self-stress. This introduces a challenge regarding the practical use of tensegrity structures, as many structures in civil engineering, such as bridge decks and roof coverings, require a surface element to be integrated into the structure. This paper describes the design development and analysis of a full-scale aluminum plate tensegrity canopy structure, which introduces a plate as a third element type. The primary reason for the plate tensegrity structure as a canopy is its high strength-to-weight ratio while providing a surface. This paper proposes an analysis method for plate tensegrity structures using dynamic relaxation, a static solution of form finding. To employ dynamic relaxation, each plate is transformed into an equivalent framework of 5 nodes and 8 bars, which significantly increases the computational efficiency of the analysis method. In addition to static analysis, a dynamic characterization is performed to ensure resistance to vibrations induced by wind and seismic activity. Results indicate that the aluminum plate tensegrity structure meets current civil engineering criteria for strength and serviceability and that the eigenfrequencies are sufficiently high to be beyond the risk of resonance for wind and seismic activity.
{"title":"Design of a Full-Scale Aluminum Plate Tensegrity Structure","authors":"Heather Gathman, Ann C. Sychterz","doi":"10.20898/j.iass.2023.003","DOIUrl":"https://doi.org/10.20898/j.iass.2023.003","url":null,"abstract":"Tensegrity structures are typically composed of bars and cables held together in a state of self-stress. This introduces a challenge regarding the practical use of tensegrity structures, as many structures in civil engineering, such as bridge decks and roof coverings, require a surface element to be integrated into the structure. This paper describes the design development and analysis of a full-scale aluminum plate tensegrity canopy structure, which introduces a plate as a third element type. The primary reason for the plate tensegrity structure as a canopy is its high strength-to-weight ratio while providing a surface. This paper proposes an analysis method for plate tensegrity structures using dynamic relaxation, a static solution of form finding. To employ dynamic relaxation, each plate is transformed into an equivalent framework of 5 nodes and 8 bars, which significantly increases the computational efficiency of the analysis method. In addition to static analysis, a dynamic characterization is performed to ensure resistance to vibrations induced by wind and seismic activity. Results indicate that the aluminum plate tensegrity structure meets current civil engineering criteria for strength and serviceability and that the eigenfrequencies are sufficiently high to be beyond the risk of resonance for wind and seismic activity.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67610227","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}
Pub Date : 2023-01-01DOI: 10.20898/j.iass.2022.021
Jian Lu, S. Xue, X. Li
Spatial cable-truss structure without inner ring cables (SCSWIRC) is a new type of cable-truss tension structures (CTTS), and its anti-collapse ability is strong, but its construction forming is difficult. The main reason is that there are a lot of struts (or compression struts) when the span of SCSWIRC is larger and struts are easy to cause winding and collision during its construction. In order to solve the difficulty of construction forming, the grid-jumping layout was proposed to simplify SCSWIRC to delete the redundant struts. It is necessary to further study whether the anti-collapse ability of the remaining structure after the grid-jumping layout is affected by grid-jumping layout. Based on transient dynamic theory, the rupture of local cables (struts) of SCSWIRC with grid-jumping layout is studied. The research results show that self-weight has a little influence on the SCSWIRC; the initial prestress only increases the internal forces of components and the same proportion of feasible prestress levels do not amplify the response of SCSWIRC with rupture of local cables (struts); the anti-collapse ability of the remaining structure after the grid-jumping layout of SCSWIRC is still strong and the ability to resist the external loads is good at the same time. The rupture of local cables (struts) for the original scheme and grid-jumping layout schemes do not cause the progressive collapse. The research contents offer useful reference for the safety design of SCSWIRC.
{"title":"Study The Influence of Grid-Jumping Layout on Spatial Calbe-Truss Structure Wihtout Inner Ring Cables with Rupture of Local Cables (Struts)","authors":"Jian Lu, S. Xue, X. Li","doi":"10.20898/j.iass.2022.021","DOIUrl":"https://doi.org/10.20898/j.iass.2022.021","url":null,"abstract":"Spatial cable-truss structure without inner ring cables (SCSWIRC) is a new type of cable-truss tension structures (CTTS), and its anti-collapse ability is strong, but its construction forming is difficult. The main reason is that there are a lot of struts (or compression struts) when the span of SCSWIRC is larger and struts are easy to cause winding and collision during its construction. In order to solve the difficulty of construction forming, the grid-jumping layout was proposed to simplify SCSWIRC to delete the redundant struts. It is necessary to further study whether the anti-collapse ability of the remaining structure after the grid-jumping layout is affected by grid-jumping layout. Based on transient dynamic theory, the rupture of local cables (struts) of SCSWIRC with grid-jumping layout is studied. The research results show that self-weight has a little influence on the SCSWIRC; the initial prestress only increases the internal forces of components and the same proportion of feasible prestress levels do not amplify the response of SCSWIRC with rupture of local cables (struts); the anti-collapse ability of the remaining structure after the grid-jumping layout of SCSWIRC is still strong and the ability to resist the external loads is good at the same time. The rupture of local cables (struts) for the original scheme and grid-jumping layout schemes do not cause the progressive collapse. The research contents offer useful reference for the safety design of SCSWIRC.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67609974","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}
Pub Date : 2023-01-01DOI: 10.20898/j.iass.2022.023
K. Hayakawa, M. Ohsaki, Jingyao Zhang
A meshless and non-parametric approach is proposed for shape design of curved surfaces consisting of approximately developable surface patches. A local Gauss map is defined at the grid point of a surface, and its developability is evaluated based on the area of the local Gauss map. An optimization problem is formulated for minimizing the sum of square areas of the local Gauss map at the grid points of the surface with specified boundary shape. Internal boundaries between the approximately developable surface patches are generated by relaxing the developability at the selected grid points. The effectiveness of the proposed method for generating various shapes of piecewise approximately developable surface is demonstrated in the numerical examples.
{"title":"Meshless Non-Parametric Shape Design of Piecewise Approximately Developable Surfaces Using Discretized Local Gauss Map","authors":"K. Hayakawa, M. Ohsaki, Jingyao Zhang","doi":"10.20898/j.iass.2022.023","DOIUrl":"https://doi.org/10.20898/j.iass.2022.023","url":null,"abstract":"A meshless and non-parametric approach is proposed for shape design of curved surfaces consisting of approximately developable surface patches. A local Gauss map is defined at the grid point of a surface, and its developability is evaluated based on the area of the local Gauss map. An optimization problem is formulated for minimizing the sum of square areas of the local Gauss map at the grid points of the surface with specified boundary shape. Internal boundaries between the approximately developable surface patches are generated by relaxing the developability at the selected grid points. The effectiveness of the proposed method for generating various shapes of piecewise approximately developable surface is demonstrated in the numerical examples.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67610037","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}
Pub Date : 2023-01-01DOI: 10.20898/j.iass.2022.022
Jan Cudzik, Aygün Atasoy
With the development of technology and the materials used, shell structures have developed into more complex forms. This article is a comparison between contemporary and historical shell structures. The change is an effect of the evolution in the design process that is the result of parametric design thinking. The study aims to investigate the impact of new technologies on the architectural form of shell structures. Was there any pivot point in the history of shell structures? The secondary objective of the study is the focus on lighting in such forms and their evolution with the view of the evolution of lighting solutions applied in architecture. With the use of new technologies, shell structures can have a new form and complex detail. They may vary in scale from small objects to large-scale structures.
{"title":"The Impact of Contemporary Technology on Shell Structures: Material and Light Solutions","authors":"Jan Cudzik, Aygün Atasoy","doi":"10.20898/j.iass.2022.022","DOIUrl":"https://doi.org/10.20898/j.iass.2022.022","url":null,"abstract":"With the development of technology and the materials used, shell structures have developed into more complex forms. This article is a comparison between contemporary and historical shell structures. The change is an effect of the evolution in the design process that is the result of parametric design thinking. The study aims to investigate the impact of new technologies on the architectural form of shell structures. Was there any pivot point in the history of shell structures? The secondary objective of the study is the focus on lighting in such forms and their evolution with the view of the evolution of lighting solutions applied in architecture. With the use of new technologies, shell structures can have a new form and complex detail. They may vary in scale from small objects to large-scale structures.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67609993","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}
Pub Date : 2023-01-01DOI: 10.20898/j.iass.2023.002
Gaoxiang Xu, Qiang Qing, Jinghai Gong
Pneumatic formwork is a kind of inflated fabric-polyurethane composite formwork formed by spraying polyurethane on the interior surface of the membrane. A numerical analysis model of composite pneumatic formwork considering the stiffness contribution of polyurethane is proposed to predict the structural response. The analysis model simulates the component of fabric and polyurethane with membrane elements and shell elements respectively, and Tie constraint of surface to surface is defined at the interface. A nonlinear material model for fabric is adopted considering the influence of stress ratio and loading history, and the constitutive relation of polyurethane is described in the foaming plane with different properties for tension and compression. Newton-Raphson incremental iterative method is used to solve the involved nonlinear problems. The simulation accuracy of the proposed analysis model is verified by comparing its predictions with test results about the load-deformation response of an inflated membrane structure and the corresponding composite pneumatic formwork under horizontal loading. The numerical model is further used to investigate the influence of the thickness of polyurethane layer on the improvement of overall structural stiffness of a larger pneumatic formwork under horizontal fresh gale, and the polyurethane is proved to be beneficial for the shape-control of pneumatic formwork.
{"title":"A Numerical Analysis Model of Composite Pneumatic Formwork Considering The Stiffness Contribution of Polyurethane Layer","authors":"Gaoxiang Xu, Qiang Qing, Jinghai Gong","doi":"10.20898/j.iass.2023.002","DOIUrl":"https://doi.org/10.20898/j.iass.2023.002","url":null,"abstract":"Pneumatic formwork is a kind of inflated fabric-polyurethane composite formwork formed by spraying polyurethane on the interior surface of the membrane. A numerical analysis model of composite pneumatic formwork considering the stiffness contribution of polyurethane is proposed to predict the structural response. The analysis model simulates the component of fabric and polyurethane with membrane elements and shell elements respectively, and Tie constraint of surface to surface is defined at the interface. A nonlinear material model for fabric is adopted considering the influence of stress ratio and loading history, and the constitutive relation of polyurethane is described in the foaming plane with different properties for tension and compression. Newton-Raphson incremental iterative method is used to solve the involved nonlinear problems. The simulation accuracy of the proposed analysis model is verified by comparing its predictions with test results about the load-deformation response of an inflated membrane structure and the corresponding composite pneumatic formwork under horizontal loading. The numerical model is further used to investigate the influence of the thickness of polyurethane layer on the improvement of overall structural stiffness of a larger pneumatic formwork under horizontal fresh gale, and the polyurethane is proved to be beneficial for the shape-control of pneumatic formwork.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67610155","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}
Pub Date : 2023-01-01DOI: 10.20898/j.iass.2023.001
Toshiaki Kimura, Hiroki Takeuchi
In this study, we propose a form-finding method for the free-formed reticulated shell structure, considering both structural performance and regularization of node connection patterns. The coordinates of the nodes of the reticulated shells are represented on the non-uniform rational B-spline (NURBS) surface. According to the principal curvature, the clustering classifies the node connection patterns into specified groups. Multi-objective optimization is performed to minimize the strain energy and maximum deviation in clusters. A multi-objective genetic algorithm is used to solve the optimization problem. The mechanical properties of the optimal solution obtained in a numerical example are discussed to confirm the effectiveness of the proposed method.
{"title":"Form-Finding for Free-Form Reticulated Shell Structure Considering Structural Performance and Regularization of Node Connection Patterns","authors":"Toshiaki Kimura, Hiroki Takeuchi","doi":"10.20898/j.iass.2023.001","DOIUrl":"https://doi.org/10.20898/j.iass.2023.001","url":null,"abstract":"In this study, we propose a form-finding method for the free-formed reticulated shell structure, considering both structural performance and regularization of node connection patterns. The coordinates of the nodes of the reticulated shells are represented on the non-uniform rational B-spline (NURBS) surface. According to the principal curvature, the clustering classifies the node connection patterns into specified groups. Multi-objective optimization is performed to minimize the strain energy and maximum deviation in clusters. A multi-objective genetic algorithm is used to solve the optimization problem. The mechanical properties of the optimal solution obtained in a numerical example are discussed to confirm the effectiveness of the proposed method.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67610137","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}
Pub Date : 2023-01-01DOI: 10.20898/j.iass.2023.005
Dabin Yang, Yi Sun, Renjie Liu, Leilei Guo
The inner concave cable-arch structures with V-shape web struts were classified, and single-tensioning construction method and multiple-tensioning construction method for continuous cable-arch structures were described. The optimization of pretension for multiple-tensioning construction method was carried out. FE models of cable-arch structures including the single-tensioning models and the multiple-tensioning models were created. The mechanical behaviors including stress ratios, stiffness, horizontal bearing reaction force and structural stability of the two kinds of models were compared. The results show that the pretension does not significantly influence the maximum resultant displacement, horizontal bearing reaction force, and stability of the single-tensioning cable-arch structures. With pretension increasing the stress ratios can be reduced. The stress ratios and stiffness decrease with the increasing of the rise-to-span ratio, and horizontal bearing reaction force slightly decreases, but structural stability has no obvious changing rules. There is no difference in mechanical behaviors between two types of cable-arch structures with the rise-to-span ratio of 0.2, it is recommended to use the single-tensioning construction method. However, the mechanical behaviors of multiple-tensioning type are generally better than that of single-tensioning type with the rise-to-span ratio of 0.3 and 0.4. It is necessary to consider the cost of construction and mechanical behaviors to determine its tensioning construction method.
{"title":"Classification and Mechanical Behaviors of Inner Concave Cable-Arch Structure with V-Shape Web Struts","authors":"Dabin Yang, Yi Sun, Renjie Liu, Leilei Guo","doi":"10.20898/j.iass.2023.005","DOIUrl":"https://doi.org/10.20898/j.iass.2023.005","url":null,"abstract":"The inner concave cable-arch structures with V-shape web struts were classified, and single-tensioning construction method and multiple-tensioning construction method for continuous cable-arch structures were described. The optimization of pretension for multiple-tensioning construction method was carried out. FE models of cable-arch structures including the single-tensioning models and the multiple-tensioning models were created. The mechanical behaviors including stress ratios, stiffness, horizontal bearing reaction force and structural stability of the two kinds of models were compared. The results show that the pretension does not significantly influence the maximum resultant displacement, horizontal bearing reaction force, and stability of the single-tensioning cable-arch structures. With pretension increasing the stress ratios can be reduced. The stress ratios and stiffness decrease with the increasing of the rise-to-span ratio, and horizontal bearing reaction force slightly decreases, but structural stability has no obvious changing rules. There is no difference in mechanical behaviors between two types of cable-arch structures with the rise-to-span ratio of 0.2, it is recommended to use the single-tensioning construction method. However, the mechanical behaviors of multiple-tensioning type are generally better than that of single-tensioning type with the rise-to-span ratio of 0.3 and 0.4. It is necessary to consider the cost of construction and mechanical behaviors to determine its tensioning construction method.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67610380","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}
Pub Date : 2022-12-01DOI: 10.20898/j.iass.2022.019
C. Robeller, Eduardo De Oliveira Barata, Enrico Valentino Tagliaboschi, Felix Schmidt-Kleespies
The HexBox Canopy demonstrates a new "plug & play" system for the rapid on-site assembly and disassembly without formwork of a segmented timber shell, consisting of relatively inexpensive, prefabricated hexagon-shaped boxes made from plywood plates. With 1531 timber segments making up 201 boxes, the HexBox shell is made exclusively of plywood components without the addition of any kind of metal fasteners for the main load-bearing structure. The major novelty is the wood-only connections between the box components, which are produced from cut-off waste material resulting from the cutting of the main plates of the structure. These connectors are inspired by traditional wedge joints, which were a smart and common method in handcrafted carpentry and cabinetmaking. Rather than attempting ultra-precisely fabricated elements, the wedges allow assembling box-like segments even when there are small imprecisions. Additionally, these joints allow for pulling and forcing the boxes together, closing gaps between the elements which may occur during assembly. Another key aspect is the introduction of an innovative technique that allows for the simple and safe 1K PUR adhesive joining of thousands of miter joints with individual dihedral angles. Conventional clamping tools are indeed designed for orthogonal miter joints and could therefore not be used here.
{"title":"Hexbox Canopy: A Segmented Timber Plate Shell with Hardwood Wedge Joints","authors":"C. Robeller, Eduardo De Oliveira Barata, Enrico Valentino Tagliaboschi, Felix Schmidt-Kleespies","doi":"10.20898/j.iass.2022.019","DOIUrl":"https://doi.org/10.20898/j.iass.2022.019","url":null,"abstract":"The HexBox Canopy demonstrates a new \"plug & play\" system for the rapid on-site assembly and disassembly without formwork of a segmented timber shell, consisting of relatively inexpensive, prefabricated hexagon-shaped boxes made from plywood plates. With 1531 timber segments making\u0000 up 201 boxes, the HexBox shell is made exclusively of plywood components without the addition of any kind of metal fasteners for the main load-bearing structure. The major novelty is the wood-only connections between the box components, which are produced from cut-off waste material resulting\u0000 from the cutting of the main plates of the structure. These connectors are inspired by traditional wedge joints, which were a smart and common method in handcrafted carpentry and cabinetmaking. Rather than attempting ultra-precisely fabricated elements, the wedges allow assembling box-like\u0000 segments even when there are small imprecisions. Additionally, these joints allow for pulling and forcing the boxes together, closing gaps between the elements which may occur during assembly. Another key aspect is the introduction of an innovative technique that allows for the simple and\u0000 safe 1K PUR adhesive joining of thousands of miter joints with individual dihedral angles. Conventional clamping tools are indeed designed for orthogonal miter joints and could therefore not be used here.","PeriodicalId":42855,"journal":{"name":"Journal of the International Association for Shell and Spatial Structures","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46056470","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}
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