Design Studies 1ASTRUCTURES

Structural Analysis & Design

analyse a structure

design a structure

2/13

given a structure, determine whether it is satisfactory

given some requirements, come up with a structure that satisfies those requirements

Design Problem

many solutions

ill-defined

problem conceptual – solution concrete

3/13

DESIGN PROBLEM (cont)

given

requirements

a) span over an object - sets spatial requirements

b) carry given load - sets structural requirements

a) materials – straws, string and adhesive tape

b) time

4/13

Problem Formulation

required properties

purpose - functiona) allow object to pass through

b) support a load

a) clear span - height and width before and after load

b) stability

c) strength

5/13

Design

what is the answer?

how to achieve required properties?

that is the question

suitable arrangementof suitable elements

= structure

6/13

Considerations modes of failure

a) stiffness - functional

b) stability

• didn’t allow for unsymmetrical loads

c) strength

• didn’t allow object through before or after

• deformations too large

• mechanism not structure • led to collapse through toppling, overturning

• elements broke

• bending of beams, buckling of supports

7/13

Knowledge Required

loads and supports types - load paths

beams, trusses, arches, cables,

types of structures

precedents bridges, bookshelves, floors, roofs, ….

actions and reactions

8/13

Knowledge Required (cont.)

equilibrium / stability moments - types of joints - topology

modes of failure compression, tension, bending, shear, buckling

material behaviour stress and strain

section properties shape and size

9/13

Simple Structural Systemgeneral principles

10/13

Designing the Structure

same as any act of designing

select suitable elements

locate elements

provide necessary relationships

achieve required performance

overall system

11/13

Relationships of Elementsstability

12/13

Topology and Geometry

many different types of elements

many ways to position elements

many ways to relate elements

explore these over 3 years

13/13

Topology and Geometry

14/14

● same topology – different geometry

● same geometry – different topology

● different geometry – different topology