scholarly journals Comparison of Point and Snow Load Deflections in Design and Analysis of Tensile Membrane Structures

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Vuk S. Milošević ◽  
Biserka Lj. Marković
Keyword(s):  
Structural Analysis ◽  
Numerical Models ◽  
Public Spaces ◽  
Point Load ◽  
European Standard ◽  
Membrane Structures ◽  
Direct Sunlight ◽  
Snow Load ◽  
Protective Structures ◽  
Tensile Membrane Structures

Tensile membrane structures are often used as protective structures in order to provide cover from snow, rain, and direct sunlight. They are widely popular because of their advanced structural and architectural properties. Currently, their application is common at sport stadia and public spaces. There are several types of loads acting on tensile membrane structures, most importantly prestress, snow load, and wind load. However, concentrated loads also act on these structures, but they are frequently neglected during the structural analysis. There is yet no European standard on designing tensile membrane structures that would give guidance on structural analysis and incorporation of point load actions in the analysis. In addition, there is little scientific knowledge on how point loads affect tensile membrane structures. This research aims at revealing whether point loads can produce significant membrane deflections and in such way cause damage to the structure or to the objects underneath the membrane. In order to evaluate their importance, point load deflections are compared to deflections induced by snow load. This was done on a large number of numerical models differing in several parameters. Models represent typical geometries of hypar membrane structures on a square base. Obtained results show that, in many cases, point loads can produce larger membrane deflections compared to the snow load. This finding will have an impact on including the point load actions into standardization of design and analysis procedures of tensile membrane structures in Europe.

scholarly journals Effects of different prestress intensities on the displacement of membrane structures under point loads

2016 ◽  
Vol 14 (3) ◽  
pp. 311-318
Author(s):  
Vuk Milosevic ◽  
Biserka Markovic ◽  
Dragoslav Stojic
Keyword(s):  
Membrane Structure ◽  
Numerical Models ◽  
Point Load ◽  
Large Displacements ◽  
Membrane Structures ◽  
Low Stiffness ◽  
External Loads

Membrane structures exhibit large displacements under external loads. These are a consequence of the low stiffness of the membrane. One of the ways to increase the stiffness of the structure is to increase the prestress intensity of the membrane or of the cables. This paper presents a research done on the influence of the prestress intensities on the displacements under point loads since point loads have a significant impact on the displacements in membrane structures. In this research the prestress of the membrane and the prestress of the edge cables have been investigated separately. Ten different intensities of the membrane prestress, and five different intensities of the cable prestress, combined with four positions of the point load have been modeled. The intensity of the point load has been kept constant in all loads cases. The research is conducted on numerical models in software Sofistik. Displacements under given parameters of the membrane structure and the point loads were recorded and maximal displacements were compared. The obtained results provide a better understanding of the relation between the prestress intensities and displacements of saddle shaped membranes. The outcome of the research can be used to better predict and to reduce the displacements of membranes under point loads.

scholarly journals The influence of tensile modulus of membrane material on membrane deflections under point load

2017 ◽  
Vol 9 (2) ◽  
pp. 21-32
Author(s):  
Vuk Milošević ◽  
Biserka Marković
Keyword(s):  
Numerical Models ◽  
Tensile Modulus ◽  
Point Load ◽  
Membrane Material ◽  
Membrane Structures

The properties of membrane structures are mostly defined by characteristics of the membrane material. One of the most important characteristics of membrane material is its tensile modulus. This paper presents a research about the relation of the tensile modulus of membrane material and membrane deflections under point load. The research was conducted on numerical models in specialised software. The value of the tensile modulus of the membrane material was varied and deflections under point load were recorded. Additionally, the orientation of the membrane material was altered and the type of membrane edges was changed. The obtained results helped better understanding of the influence of tensile modulus of the material on membrane deflections under point load.

The Development of a Eurocode “Tensile Membrane Structures”

2014 ◽  
Vol 102 (20) ◽  
pp. 1572-1578 ◽  
Author(s):  
Natalie Stranghöner ◽  
Jörg Uhlemann ◽  
Marijke Mollaert ◽  
Peter Gosling
Keyword(s):  
Membrane Structures ◽  
Tensile Membrane Structures

scholarly journals Thermal-Structural Design of Actively-Cooled Panels Reinforced by Light-Weight Truss Cores

2013 ◽  
Author(s):  
Hongwei Song ◽  
Mingjun Li ◽  
Chenguang Huang ◽  
Xi Wang
Keyword(s):  
Heat Transfer ◽  
Structural Analysis ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Thermal Environment ◽  
Numerical Models ◽  
Lightweight Design ◽  
Optimization Procedure ◽  
Combustion Gas ◽  
Design Variables

This paper focuses on thermal-structural analysis and lightweight design of actively-cooled panels reinforced by low density lattice-framed material (LFM) truss cores. Numerical models for actively-cooled panels are built up with parametric codes to perform the coupled thermal-structural analysis, considering the internal thermal environment of convective heat transfer in the combustor and convective heat transfer in the cooling channel, and internal pressures from the combustion gas and the coolant. A preliminary comparison of the LFM truss reinforced actively-cooled panel and the non-reinforced panel demonstrates that the thermal-structural behavior is significantly improved. Then, an optimization procedure is carried out to find the lightest design while satisfying thermal deformation and plastic strain constraints, with thicknesses of face sheets and topology parameters of LFM truss as design variables. The optimization result demonstrates that, compared with the non-reinforced actively-cooled panels, weight reduction for the panel reinforced by LFM truss may reach 19.6%. We have also fabricated this type of actively-cooled panel in the laboratory level, and the specimen shows good mechanical behaviors.

scholarly journals Tensile membrane structures

2015 ◽  
Vol 8 (4) ◽  
pp. 221-221 ◽  
Author(s):  
Natalie Stranghöner
Keyword(s):  
Membrane Structures ◽  
Tensile Membrane Structures

scholarly journals Structural analysis by interval approach

2008 ◽  
pp. 869-880
Author(s):  
Franck Massa ◽  
Karine Mourier-Ruffin ◽  
Bertrand Lallemand ◽  
Thierry Tison
Keyword(s):  
Sensitivity Analysis ◽  
Finite Element ◽  
Structural Analysis ◽  
Design Process ◽  
Structural Design ◽  
Numerical Models ◽  
Test Case ◽  
Design Phase ◽  
Deterministic Analysis ◽  
Interval Approach

Finite element simulations are well established in industry and are an essential part of the design phase for mechanical structures. Although numerical models have become more and more complex and realistic, the results can still be relatively far from observed reality. Nowadays, use of deterministic analysis is limited due to the existence of several kinds of imperfections in the different steps of the structural design process. This paper presents a general non-probabilistic methodology that uses interval sets to propagate the imperfections. This methodology incorporates sensitivity analysis and reanalysis techniques. Numerical interval results for a test case were compared to experimental interval results to demonstrate the capabilities of the proposed methodology.

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