Efficient construction of concrete shells by Pneumatic Forming of Hardened Concrete: Construction of a concrete shell bridge in Austria by inflation

Kromoser, Benjamin; Kollegger, Johann

doi:10.1002/suco.201900169

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…Дослідження, проведені на сьогодні в області поведінки великопролітних арочних систем і оболонок в часі [2,3,4], вимагають подальшого поглиблення, тому що здебільшого вони не враховують специфіку тривалих експлуатаційних впливів, через які можуть утворюватися не тільки значні деформації, а й перерозподіл навантажень, викликаючи зміну первинної конструктивної схеми об'єкта. Виходячи з цього, розгляд питань, пов'язаних безпосередньо з аналізом напруженодеформованого стану арочних систем і оболонок будівель при тривалій експлуатації (особливо якщо це пам'ятки архітектури та містобудування з класом наслідків відмови СС3), слід вважати доцільним.…”

Section: постановка проблемиunclassified

Study of Deformability of the Large-Span Roof Structural System in the Form of an Asymmetrical Shell

Naboka,

Firsov

2024

MEC

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The scientific article is devoted to a complex study of deformability of saddle-type shell of negative Gaussian curvature of a public object that has been in operation for a long time for further general restoration of the building’s roofing system. The authors have developed a specific algorithm for conducting experimental research, providing additional static load on a shell at the lower point of the gentle axial line of the supporting arches. To smoothly carry out the loading procedure, we mounted containers in barrel form on the roof surface and gradually filled them with water. We carried out an experimental evaluation of the bearing capacity of the shell with the determination of the redistribution of forces along the length of the section in the lower zone of the conventionally outlined arch. The experimental test results revealed that the deformability of the shell surface under short-term loading did not exceed 2.0 mm, and, under long-term loading, it was no more than 4.0 mm. Analysis of the qualitative features of structure deformation shows that the displacement of the roof’s points, located symmetrically to the vertical axis, has the opposite sign to the sign of the displacement of the actual ‘saddle’ point (the case of symmetrical deformation). We conducted a numerical verification of the behaviour of the investigated structure by forming a detailed finite element spatial model of the shell. Comparison of the results of numerical calculation with the results of field tests shows the coincidence of qualitative and quantitative parameters, which, in turn, characterises the developed theoretical model as fully adequate and suitable for analysing the stress-strain state of similar large-span structural systems. Based on the results of comprehensive theoretical and experimental research, we made proposals for the further restoration of the roofing structure with the limitation of the self-weight of the covering to 1 kN/m2. Engineers and scientists can use the research results to reconstruct similar authentic structural systems. Keywords: calculation, restoration, loading, deflection, shell, negative Gaussian curvature.

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Section: постановка проблемиunclassified

Study of Deformability of the Large-Span Roof Structural System in the Form of an Asymmetrical Shell

Naboka,

Firsov

2024

MEC

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“…To tackle the problem of inefficiency faced in the conventional method of shell construction, several new methods have been proposed over the years. These include construction using flexible membranes [ 5 , 6 , 7 , 8 ], pneumatic formwork [ 9 ], pneumatic forming of hardened concrete [ 10 , 11 ], and modularization. Currently, the modularization of concrete shells for later assembly from individual prefabricated modules is the most advanced method, see, e.g., [ 12 ], and a significant number of methods for efficient module production, the most widely used of which are adjustable formwork [ 13 ] and automated formwork production using CNC-milling [ 14 ] or wire-cutting [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Application-Driven Material Design of Printable Strain Hardening Cementitious Composites (SHCC)

et al. 2022

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The creation of concrete shells from customized prefabricated modules is a novel approach that facilitates the construction of free-form surfaces considerably. In the framework of the Adaptive Concrete Diamond Construction (ACDC) project at TU Dresden, a material for 3D printing of the outer contours of such modules has been developed based on the principles of Strain Hardening Cementitious Composite (SHCC). In addition to its high ductility, the required material must also be suitable for 3D printing while enabling the achievement of high geometric accuracy in the manufacture of the modules. To gain the required performance, cellulose ether and starch ether were used specifically to extend the open time, for a longer period of maintaining initial workability, as well as for enhancing shape stability and surface quality. An extensive experimental program was carried out to evaluate the outcomes of the material modifications, including flow table tests, water retention tests, and several specific tests to determine the adhesiveness of the fresh SHCC. For hardened SHCC, surface roughness was assessed using a laser 3D scanner in addition to testing its mechanical properties.

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“…Pneumatic Forming of Hardened Concrete is a relatively new approach developed at the TU Wien [3], [23]- [25]. Similar to the pneumatic formwork method, a thin membrane is filled with air and serves as a supporting structure, but only after hardening of the concrete above it.…”

Section: Introductionmentioning

confidence: 99%

3D Printing and Assembling of Frame Modules Using Printable Strain-Hardening Cement-Based Composites (SHCC)

Ivaniuk¹,

Eichenauer²,

Tošić³

et al. 2022

Preprint

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Despite all their advantages, load-bearing concrete shell structures with double curvatures are not frequently in use. The main reason is the complexity of their construction. In such a context, this article starts with a brief, critical review of existing technologies while their pros and cons are highlighted. Against that background the authors then propose a new approach for the highly automated fabrication of gridshell structures from variable modules. To demonstrate the feasibility of such a new technology, a demonstrator called ConDIT 1.0, a sphere-like shell structure composed of several frames was designed and built. The frame modules were fabricated automatically using extrusion-based 3D printing and a printable, strain-hardening cement-based composite (SHCC). This article presents the design of ConDIT 1.0, the mechanical material characterization of printed SHCC, the technology of module production, the results of geometry verification for print modules using 3D scanning, and the procedure for the demonstrator’s assembly. TRANSLATE with x English ArabicHebrewPolish BulgarianHindiPortuguese CatalanHmong DawRomanian Chinese SimplifiedHungarianRussian Chinese TraditionalIndonesianSlovak CzechItalianSlovenian DanishJapaneseSpanish DutchKlingonSwedish EnglishKoreanThai EstonianLatvianTurkish FinnishLithuanianUkrainian FrenchMalayUrdu GermanMalteseVietnamese GreekNorwegianWelsh Haitian CreolePersian TRANSLATE with COPY THE URL BELOW Back EMBED THE SNIPPET BELOW IN YOUR SITE Enable collaborative features and customize widget: Bing Webmaster Portal Back

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Efficient construction of concrete shells by Pneumatic Forming of Hardened Concrete: Construction of a concrete shell bridge in Austria by inflation

Cited by 9 publications

References 9 publications

Study of Deformability of the Large-Span Roof Structural System in the Form of an Asymmetrical Shell

Study of Deformability of the Large-Span Roof Structural System in the Form of an Asymmetrical Shell

Application-Driven Material Design of Printable Strain Hardening Cementitious Composites (SHCC)

3D Printing and Assembling of Frame Modules Using Printable Strain-Hardening Cement-Based Composites (SHCC)

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