Folded Plate Structure 2m1864

Folded Plate Structure When Engineering Meets the Arts …… Ehsanul Kabir Lecturer Dept. of Civil Engineering, PCIU

Outline  Definition  Folding Systems in Nature  The Principle of Folding  The Basic concept of Folding  Structural Behavior of Folding  Types of Folded Structure  The Application of Folded Structures  Advantages and Disadvantages of FoldedPlate Structure  Some Real Life Examples of Folded Plate

Definition Folded plates are assemblies of flat plates rigidly connected together along their edges in such a way that the structural system capable of carrying loads without the need for additional ing beams along mutual edges.

Engineer Eudene Freyssinet performed the first roof with the folded structure in 1923 as an aircraft hangar at Orly Airport in Paris.

Folding Systems in Nature The principle of folding as a tool to develop a general structural shape has been known for a long time. Folded structure systems which are analogous to several biological systems such as found at broadleaf-tree leaves, petals and foldable insect wings, are adopted to be employed in a new, technical way.

Leaf of Palm Tree

Beetle Insect With Foldable Wings

Seashell

The Principle of Folding The structural characteristics of folding structures depend on Pattern of Folding  Basic Geometrical Shape  Material  Connection of different Folding Planes  Design of Bearings

The Basic concept of Folding

The concept of stiffness generation

Structural Behavior of Folding Load Distribution process :  At first, the external forces are transferred to the shorter edge of one folding element.  There, the reaction as an axial force is divided between the adjacent elements.  Then the forces transferred to the bearings.

Structural Condition Of Folding Structures.

Types of Folded Structure Based on geometric shape folded structures can be divided into:  Folded plate surfaces structures  Folded plate frames structures  Spatial folded plate structures

Types of Folded Structure Classification of folded structures based on the material they are made of:  Folded structures made of reinforced concrete  Metal folded structures  Folded structures of wood  Folded structures of glass  Folded structures of plastic materials  Folded constructions made in combination of different materials

 As Roof Structure

 As Floor Structure Securing The Foundation Pit With Larsen Planks

Mezzanine ceiling called "Kielsteg"

Church of Notre Dame de Royan,

Miami Marine Stadium, Florida

The Application of Folded Structures

 As Wall Structure

 As Steel Sheet Piles

Advantages and Disadvantages of Folded-Plate Structure

 Advantages:  Very light form of construction. To span 30 m shell thickness required is 60 mm only.  The use of concrete as a building material reduces both materials cost and a construction cost.  Longer span can be provided.  Flat shapes by choosing certain arched shapes.  Esthetically it looks good over other forms of construction.  Disadvantages:  Shuttering is difficult.  Greater accuracy in formwork is required.  Good labor and supervision necessary.  Rise of roof may be a disadvantage.

Some Real Life Examples of Folded Plate Structure

Air Force Academy Chapel, USA Architect: Walter Netsch, Length: 280 ft, Height: 150 ft, Width: 84 ft, Year: 1962 Source: en.wikipedia.org/wiki/United_States_Air_Force_Academy_Cadet

Some Real Life Examples of Folded Plate Structure

Yokohama International enger Terminal, Architect: Alejandro Zaera-Polo & Farshid Moussavi Floor Area: 34,732 m2, Length: 430m, Height: 15m, Width: 70m Source: www.osanbashi.com/en/outline/features.html

Some Real Life Examples of Folded Plate Structure

Bangabandhu Sheikh Mujibur Rahman Novo Theatre, Architect: Ali Imam, Year: 2004, Seating capacity: 275 people Source: www.novotheatre.gov.bd

Some Real Life Examples of Folded Plate Structure

More In Bangladesh:

Bangladesh National Museum

Kamalapur Rail Station

Some Real Life Examples of Folded Plate Structure

More In Bangladesh:

Mohakhali Bus Terminal

Mausoleum Of Three Leaders

Recommendation Specially during disaster, many people become homeless. We can use the concept of folded plate structure to make portable shelter for the homeless people. Significant works on this project is already in progress. It is very cheap and easily useable by anyone. We just have to adopt it for our people.

ReCover Accordion

Light Weight Emergency

And Last… The concept of Folded plate system is a wonderful gift of nature to us. We should use this concept for more innovative ways to improve our structures.