Documents published in Scipedia

• Buoycrete, a light-weight concrete in combination with a membrane mold

  A. Pronk, G. Visch

  membranes2023.

  
  

  Abstract

  In this study, the authors present Buoycrete, a new material and work method invented by the company Boskalis. “Buoycrete” is a new cement mixture and work method. This mixture and the work method related to this material are developed by Boskalis and are patented in 2017. The material is a lightweight concrete mixture that is ‘neutrally buoyant’ and non-dissolvable. The concrete is intended to be used under water. The neutral buoyancy makes that the concrete does not sink or float. In other words, within the cement mixture under water, right after application, there is no resultant vertical force apparent because of the neutral buoyancy. The cement slurry will be kept in place only by the internal cohesion of the Buoycrete slurry itself. This allows for fast and flexible adjusting of the concrete shape under water before the concrete cures. The unique cement-based grout opens up a wide array of possible application areas and markets, especially since application equipment, mixing equipment and curing characteristics are analogue to normal cement mixtures. Currently, there are no comparable light-weight cement mixtures available on the market. This paper will start with an overview of concrete structures in combination with fabrics and will present the structural behavior, construction methods and applications of Buoycrete. It demonstrates that Buoycrete combined with fabric formwork creates new possibilities for the restauration of key walls but can also be used for the realization of façade elements, shell structures and other free forms.

  Abstract
  In this study, the authors present Buoycrete, a new material and work method invented by the company Boskalis. “Buoycrete” is a new cement mixture and work method. [...]

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• An Analytical Method for Precise Forming of Membrane Structure Considering the Spindle Direction of Membrane Material

  Y. Pang, S. Shen, G. Qiu, J. Gong

  membranes2023.

  
  

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• Shaping Steel Grid Shells by Applying a Visual Programming Language

  J. Dzwierzynska

  membranes2023.

  
  

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• A new numerical model for deployment process of inflatable aerodynamic decelerator based on the reverse modelling technique and control volume method

  Q. Lei, X. Wang, Y. He, H. Yang

  membranes2023.

  
  

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• Tracing non-linearities in the load bearing behavior of structural membranes: an investigation of typical shapes and load cases

  A. Goldbach, K. Bletzinger

  membranes2023.

  
  

  Abstract

  . One of the prevalent challenges in the design, numerical analysis and verification of structural membranes lies in the non-linearity of their load-response curves. Structural analysis has to be performed with a geometrically non-linear approach, due to the interaction of form and forces and thus a linear extrapolation or combination of analyis results is not possible. The appropriate modeling of the environmental impacts (such as wind and snow) also has a significant influence on the analysis results. Furthermore, non-linear material behavior can be of interest. The resulting load-response curves (e.g. stresses, deformations) are typically non-linear and their interpretation towards the underlying safety requirements is not straight forward. In addition, the prestress also has a major influence on membranes' structural behavior. However, the current European regulations for the proof of the limit states (ULS and SLS) of any building requires a simplified categorization of the structural behavior. This research investigates the load-bearing behavior of typical re-occurring membrane shapes in the context of current verification requirements. Typical load cases are applied and the structural behavior is shown under consideration of the mentioned non-linearities.

  Abstract
  . One of the prevalent challenges in the design, numerical analysis and verification of structural membranes lies in the non-linearity of their load-response curves. Structural [...]

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• Computational sensitivity analysis of hybrid lightweight structures

  M. Fußeder, T. Oberbichler, K. Bletzinger

  membranes2023.

  
  

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• Shape-adaptive Climate Loading of Tensile Surface Structures

  Z. Zajac, R. Lang, I. Němec

  membranes2023.

  
  

  Abstract

  This paper deals with climate loading of tensile surface structures. The approaches for the snow load calculation were summarized and a new usage for tensile surface structures based on established procedures has been proposed. The snow load distribution and accumulation was presented in the form of an algorithm implemented in a finite element software. The results of the algorithm for snow load accumulation were verified on simple examples with vertical, inclined and curved surfaces.

  Abstract
  This paper deals with climate loading of tensile surface structures. The approaches for the snow load calculation were summarized and a new usage for tensile surface structures [...]

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• Correlation between uniaxial and biaxial creep behaviour of ETFE foils

  F. Surholt, J. Uhlemann, N. Stranghöner

  membranes2023.

  
  

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• Design and Construction of an Asymptotic Geodesic Timber Gridshell

  E. Schling, Z. Wan, P. D'Acunto

  membranes2023.

  
  

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• Does the stress-strain behaviour of PTFE-coated glass fibre fabrics depend on the load history?

  J. Uhlemann, N. Stranghöner

  membranes2023.

  
  

  Abstract

  It is known that PTFE-coated glass fibre fabrics show a mechanical saturation behaviour under repetitive monotonous loads [1]. That means that the stress-strain behaviour changes from load cycle to load cycle. This behaviour is convergent so that stiffness values strive towards asymptote values. However, when using these fabrics in membrane structures they are subjected to various natural load histories which lead to biaxial stresses with different stress ratios in different orders. The question arises whether loads of different orders lead to a different material response. If so, stiffness parameters would not be global but would have to be given dependent on the order of loads.

  Abstract
  It is known that PTFE-coated glass fibre fabrics show a mechanical saturation behaviour under repetitive monotonous loads [1]. That means that the stress-strain behaviour [...]

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