International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 05 | May -2017
p-ISSN: 2395-0072
www.irjet.net
The Behavior of Tensile Fabric Membrane Structure Attarwala Shehzad I1, Ankit Agrawal2, Ar Parimal Jhuvar3 1P.G.
Student, Parul Institute of Technology, Waghodia Professor, Parul Institute of Technology, Waghodia 3Architects Planners Valuers & Interior Designers, Nisarg Rachna,Bharuch 2Assistant
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Abstract - Membrane Structures are highly popular in
architectural design now a days. There is trend of using membrane structures. It satisfies both attractive architect’s design as well as structural design. Due to its light weight, earthquake force is neglected, whereas wind load is critical for the structure. Fabric resists tension and has no compression or bearing. Due to its light weight and stretch property, they can be used on places such as stadiums, large parking etc. Computer aids like Form Finder, Dlubal RFEM and AutoCAD is used for modeling and analysis. A general introduction is presented on material properties, membrane types and design process. A part of dissertation is to the behavior of fabric membrane such as stress-strain distribution and application of wind load on membrane. The study aims to reach the conclusion that, does it is advisable to use fabric membrane as a roof for any residential building.
The dissertation work aims, to study the concept and behavior behind the design, analysis and construction of tensile fabric membrane structure. Study is to carry out more research on fabric membrane in order to develop understanding about fabric properties, its innovative design, construction work and future scope. Objective of the study is to observe the variation in the analysis results between two fabric membrane materials, with same structure design. As there no such IS code provision, analysis will be based on previous studies and results respectively. On the basis of design and analysis, it is objective to state wither fabric membrane structure is suitable as a roof for residential building or small houses or Not?
Key Words: Fabric, Form-Finding, Membrane, Strain, Stress
[1]. INTRODUCTION Tensile membrane structures forms a part of a unique technology which gives designers, architects and engineers the ability to experiment with form (Shape) and create exciting structures. These structures do not only visually exciting, but are environmentally good and economically competitive as well. Since the materials are lightweight, they are very efficient in long span applications and are frequently constructed with considerable savings in the foundation and supporting structure costs. As an additional benefit, they do additional than just transmit forces to the ground. They provide the basic architectural form and provide much of the building cover. Conventional structures depend on internal rigidity (stiffness) to attain stability and to carry loads. Fabric structures constructed of elements that have small or no bending or shear stiffness (cables and membranes) must depend on their form and internal tensile forces to carry loads. These structures are complicated to design as they have a tendency to be highly non-linear behavior; also their shape is not known when design starts. Tensioned fabric increases its capacity to carry load as it deform. They can maintain high ratio of applied load to self –weight, as compared to steel and concrete structure for same span.
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Figure 1: Conceptual design of fabric structure 1.1 Why Tensile Shape Like This Large flat pieces of fabric are very poor on resisting loads. Imagine four person each pulling the strings attached through a tennis ball Fig 2, A fifth person pushing down on the ball can deflect it easily, same as flat tent roof. Again, Try lifting two opposite strings up and lowering the other two. Fig 3, The ball will be now locked in space. Applying this principle to fabric membrane and we achieve ‘anticlastic’ double curvature surface. It sounds impressive but actually it is simply resulting from one of the three fabric shapes; the hyper, the cone and the barrel Fig 4.
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