Documents published in Scipedia

• The Determination of the Mechanical Performance of Membrane Structures in Architectural Applications

  C. Maywald, T. Balster

  membranes2023.

  
  

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• Comparative Assessment Of Life Cycle Aspects Of Lightweight And Conventional Structures And Their Integration Into An Educational Approach

  H. Boegner-Balz, S. Von der Weth, K. Moritz

  membranes2023.

  
  

  Abstract

  . The article provides information on how teaching sustainability can be applied in a practical context. A comparison of the life cycle of two roof variants and their evaluation shows how the teaching concept can be implemented.

  Abstract
  . The article provides information on how teaching sustainability can be applied in a practical context. A comparison of the life cycle of two roof variants and their evaluation [...]

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• Tensile Behaviour of ETFE Foils with Various Types of Area Weld Seams

  D. Runge, J. Uhlemann, N. Stranghöner

  membranes2023.

  
  

  Abstract

  ETFE foils are already an established building material in membrane construction. Many prestigious buildings have already been realised with the transparent and printable foils. The manufacturing and installation of the mostly double-curved ETFE foil structures are made possible by the weldability of the fluoropolymer. The manufactured weld seams can be divided into area and edge weld seams. Both types of ETFE weld seams provide a lower uniaxial tensile strength in comparison to the base material. Weld seams in ETFE structures are the decisive points for the limit state design, see also FprCEN/TS 19102, which for the first time provides a standardised design concept for membrane structures based on the Eurocode design philosophy. With the release of prCEN/TS 19102, a minimum tensile strength and a partial safety factor for area weld seams are given relying on the partial safety concept of the Eurocodes according to EN 1990. Nevertheless, the given values are not based on a comprehensive experimental test evaluation so far. In the frame of this contribution, for the first time, results of investigations into the tensile strength of different configurations of area weld seams are presented. These configurations include different manufacturers, foil products, foil thicknesses, test temperatures, types of area weld seams and welding processes. Based on these results, a general minimum requirement for the tensile strength of area weld seams could be determined for future standardization processes beside that a new reliability analysis according to EN 1990 for the determination of the partial safety factor for area weld seams has been carried out. These new results will be used to improve the design concept of the future Eurocode for membrane structures which will be developed on the basis of prCEN/TS 19102. In this contribution first results of this investigations are presented

  Abstract
  ETFE foils are already an established building material in membrane construction. Many prestigious buildings have already been realised with the transparent and printable [...]

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• Thermomechanical characterisation and linear viscoelastic modelling of ETFE membranes

  A. Comitti, F. Bosi

  membranes2023.

  
  

  • 1
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• Experimental Study on Precise Forming of Inflated Membrane Structure Using Airship Membrane Material

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

  membranes2023.

  
  

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• 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.

  
  

  • 3
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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.

  
  

  • 1
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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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