Journal: Proceedings of IASS Annual Symposia

Abbreviation

Publisher

International Association for Shell and Spatial Structures

Journal Volumes

ISSN

2518-6582

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2017 - 201962020 - 20224
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Publications 1 - 10 of 10
  • X-Shell Pavilion: A Deployable Elastic Rod Structure
    Item type: Conference Paper
    Isvoranu, Florin; Panetta, Julian; Chen, Tian; et al. (2019)
    Proceedings of IASS Annual Symposia ~ Proceedings of the IASS Annual Symposium 2019 - Structural Membrane 2019: Form and Force
  • Reality capture and site-scanning techniques for material reuse planning
    Item type: Conference Paper
    Xiong, Zhijia; Gordon, Matthew; Byers, Brandon; et al. (2022)
    Proceedings of IASS Annual Symposia ~ Proceedings of the IASS/APCS 2022 Beijing Symposium: Sustainable Heritage Challenges and Strategies in the Preservation and Conservation of 20th Century Historic Concrete Shells
    The reuse of building materials requires both broad-ranging and detailed information on available building stocks in order to effectively plan for connecting available materials with their eventual reuse in new buildings. Critical information includes component counts, dimensions, and on-site locations. Currently, this information is usually gathered using manual measurements, though contemporary digitization and scanning technology can be used to efficiently gather dimensional and geometric data about pre-demolition sites. The primary digital technologies to automate this data gathering, being photogrammetry and terrestrial Light Detection and Ranging (LIDAR), have historically shown significant gaps in efficiency and accuracy, while their hardware and software systems are rapidly advancing in capabilities. In this study, contemporary implementations of these methods are compared for their efficiency, interior coverage, and raw accuracy across two case studies with significant geometric differences. These results inform decision-making regarding the appropriate integration of these technologies in industry and identify technologies that require more development for effective use.
  • Assembly-aware design of masonry shell structures: a computational approach
    Item type: Conference Paper
    Kao, Gene Ting-Chun; Körner, Axel; Sonntag, Daniel; et al. (2017)
    Proceedings of IASS Annual Symposia ~ Interfaces: Architecture, Engineering, Science, Annual Meeting of the International Association of Shell & Spatial Structures (IASS),
    This paper proposes a workflow for Assembly-Aware Design (AAD) of masonry shell structures and introduces an interactive tool in a CAD environment to assist the design process while simulating the step-by-step assembly of masonry blocks. Thus designers can explore the design space of masonry shell structures and be aware of structural performance before the assembly phase, at the early design stage. Masonry shell structures are an old construction technique, which has recently received a lot of attention due to new computational methods. Even though the form of such a structure is optimised for structural performance, its incomplete form during construction often requires the support of falseworks, which can be extensive, costly and time-consuming. To tackle this unsolved problem, we developed an assembly strategy that significantly reduces the falsework usage while still maintaining the equilibrium of the incomplete shell at each assembly step. The key idea is to compute a disassembly strategy inspired by the Jenga game and then reverse it to obtain the actual assembly sequence of the masonry blocks. Rather than using discrete element methods to predict the structural behaviour of the masonry blocks, we employed the GPU-based rigid-body dynamic solver from the engine NVIDIA PhysX, this allows very fast computation speeds while still offering sufficient accuracy for our purposes. Finally, we verified our method using small-scale 3D printed models.
  • Gengo Matsui: the contribution of a structural engineer to postwar Japanese architecture
    Item type: Conference Paper
    Maleva, Viktoriya; Garzanti, Alessandro; Shimizu, Yasumasa; et al. (2022)
    Proceedings of IASS Annual Symposia ~ Proceedings of the IASS/APCS 2022 Beijing Symposium: Sustainable Heritage
    In Western practice, building design often results from a process of sequential involvement of an architect and a structural engineer. As such, the collaboration becomes a negotiation between pre conceived spatial qualities and structural requirements, in which the input of the engineer is confined within the dimensioning of a structural system retrofitted within an already projected spatial construct. Although efficient, this repartition of tasks greatly limits the potential of structural design. An alternative to this sequential approach is provided by the Japanese building culture, in which collaborations between architects and structural engineers led to the development of innovative solutions, merging the border between the two disciplines. The present paper aims at investigating this alternative design approach through the key figure of the Japanese structural engineer Gengo Matsui (1920-1996), one of the protagonists in the evolution of Japanese architecture during the 20th century. In particular, the paper discusses the genesis and the early developments of the void slab system as a tangible result of the collaboration with the architect Kiyonori Kikutake (1928-2011). Through a detailed analysis of existing literature and exemplary projects, the current research seeks to illustrate Matsui’s contribution as a structural engineer to the creation of elegant structural systems in which the pragmatic needs for load bearing capacity are seamlessly integrated within ambitious architectural visions.
  • Design-oriented approach to teach structures in architecture based on graphic statics
    Item type: Conference Paper
    Enrique, Lluís; Tanadini, Davide; Block, Philippe; et al. (2018)
    Proceedings of IASS Annual Symposia ~ IASS 2018 Boston Symposium: Education of architecture and technology
  • Structural performance of the grain-informed glued butt joint system for a large-span segmented CLT shell structure
    Item type: Conference Paper
    Adelzadeh, Amin; Karimian-Aliabadi, Hamed; Muster, Marcel; et al. (2022)
    Proceedings of IASS Annual Symposia ~ Proceedings of the IASS/APCS 2022 Beijing Symposium: Timber and Bio-based Concepts for Sustainable Innovation in Construction
    This research is an extension of the work from our previous study on using digital technology to construct lightweight wood-only shell structures from Cross-Laminated Timber (CLT) production waste. In a previous paper, we developed an algorithm that turns CLT offcuts into efficient timber plates and uses them for the construction of a medium-scale compression-only shell demonstrator. Although the FEM analysis and experimental load tests proved the structural efficiency of wooden connectors, we found that realization of a significantly larger span requires a joint system with a higher tension resistance capacity. As a solution, this paper presents a custom adhesive joint system for reaching a higher load-bearing capacity of CLT plates for withstanding both compression and tension forces, enabling the construction of a larger shell structure completely without metal connectors. The joint system consists of an innovative gluing method without any additional bonding agent and wood grain direction optimization that increases the adhesive strength of butt joints where CLT plates are fastened together. The paper discusses the possible applications and limitations of the construction system while presenting the structural analyses for a load-bearing shell demonstrator with a column-free span of 35 meters. To validate the structural performance of the construction system, FEM analysis and MATLAB post-processing of the FEM results are presented.
  • Exploring the potential of equilibrium-based methods in additive manufacturing: the Digital Bamboo pavilion
    Item type: Conference Paper
    Tanadini, Davide; Ohlbrock, Patrick Ole; Kladeftira, Marirena; et al. (2022)
    Proceedings of IASS Annual Symposia ~ Proceedings of the IASS/APCS 2022 Beijing Symposium: Next Generation Parametric Design
    Additive manufacturing allows using naturally grown structural elements in combination with 3D printed components, aiming to foster a more sustainable building culture. However, from a structural perspective, the combined use of natural and artificial materials introduces new uncertainties and challenges in relation to the design and analysis of the global load-bearing behavior of structures, as well as their connection systems. In this context, equilibrium-based methods derived from the lower bound theorem of the theory of plasticity are particularly effective since they are not restricted to a specific structural typology, material, or scale. This paper illustrates the application of equilibrium-based methods such as strut-and-tie modeling and graphic statics to the structural design and analysis of a full- scale demonstrator, the Digital Bamboo pavilion. The load-bearing system of the pavilion is a bamboo space frame reinforced by post-tensioned cables. The bamboo elements are connected via bespoke 3D printed nylon and steel connections. Thanks to the combination of natural and artificial materials, the Digital Bamboo exhibits a filigree high-performance geometry that goes beyond the ordinary space frame architecture.
  • Hierarchical form-finding with Combinatorial Equilibrium Modelling
    Item type: Conference Paper
    Ohlbrock, Patrick Ole; D'Acunto, Pierluigi; Jasienski, Jean-Philippe (2018)
    Proceedings of IASS Annual Symposia ~ IASS 2018 Boston Symposium: Graphic statics
  • Full-scale prototype of a cable-net and fabric formed concrete thin-shell roof
    Item type: Conference Paper
    Méndez Echenagucia, Tomás; Pigram, Dave; Liew, Andrew; et al. (2018)
    Proceedings of IASS Annual Symposia ~ IASS 2018 Boston Symposium: Shell structures
  • The global equilibrium of hypar-combined shells based on the method of graphic statics
    Item type: Conference Paper
    Cao, Ting; Schwartz, Joseph; Kotnik, Toni (2017)
    Proceedings of IASS Annual Symposia ~ IASS 2017 Hamburg Symposium: Graphic Statics
Publications 1 - 10 of 10