Framed_struturesx - sorianas

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25 Νοε 2013 (πριν από 3 χρόνια και 11 μήνες)

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FRAMED

STRUCTURE

Members:

Soriana

Álvarez

#C. 09
-
11053

Teresa Tam


#C. 09
-
11034

Ainara

Ricchiutti

#C. 09
-
11016

Logical Sequence:

1.

Framed Structures


-
Introduction
:




Structural function



Structural types

and

a definition of framed structure


2.
Building components

of the structure


3.
Structural material


-
Wood


-
Concrete



-
Steel


2.

Examples


Structural function

requirements


Physical actions



Mass



Inertia forces



Dimensional changes




Stable



Resist

basic charges



Overload

withstand

foreseeable



Earthquakes


structural objective



Limiting

deformations



Vibrations

prevent




The passage of time.


Structural typology
We are
refering

to

its geometry,

depending mainly on its

use,

taking
into

account the maximum

material efficiency,

and minimum
obstruction

space.


Burnham pavilion

Chicago ILLINOIS

Museum of contemporary culture

London ENGLAND

Framed

Structure


A

framed

structure

in

any

material

is

one

that

is

made

stable

by

a

skeleton

that

is

able

to

stand

by

itself

as

a

rigid

structure

without

depending

on

floors

or

walls

to

resist

deformation
.

Materials

such

as

wood,

steel,

and

reinforced

concrete,

which

are

strong

in

both

tension

and

compression
.


Function is to cover the
surface

The constituent elements


For concrete to steel is
the width and thickness

Beams

Area and shape.


the tensile modulus
elasticity




The
heavy timber frame
, in which large
posts, spaced relatively far apart, support thick
floors and roof
beams.

In the heavy
-
timber system, the beams are
strong enough to allow the upper story and roof
to project beyond the plane of the ground
-
floor
posts, increasing the space and weather
protection. The members are usually exposed on
the exterior.





C
omposed
of many small and closely spaced members
that could be handled easily and assembled quickly by
nailing instead of
by
the slow joinery and
dowelling
of
the past. Construction is similar in the two systems,
since they are both based on the
post
-
and
-
lintel
principle . Posts must rest on a level, waterproof
foundation, usually composed of masonry or concrete,
on which the
sill
(base member) is
attached


The light frame, however, is sheathed with
vertical or horizontal boarding or shingling,
which is jointed or overlapped for weather
protection. Sheathing helps to brace as well
as to protect the frame, so the frame is not
structurally independent as in steel frame
construction. The light frame system has not
been significantly improved since its
introduction, and it lags behind other
modern
techniques


Steel framing is based on the same principle but is
much simplified by the far greater strength of the
material, which provides
more rigidity
with
fewer
members. The load
-
bearing capacity of steel is
adopted for buildings many times higher than
those made of other materials. Because the column
and beam are fused by riveting or welding ,
stresses are distributed between them, and both
can be longer and lighter than in structures in
which they work independently as post
-
and
-
lintel.

Since structural steel must be
protected from corrosion, the
skeleton is either covered by
curtain walls
or surfaced
in concrete or, more rarely,
painted. The steel frame is
used also in single story
buildings where large spans
are
required

The
simple cube then
can be abandoned for
covering systems
employing arches,
trusses, and other
elements in a limitless
variety of forms in
order to suit the
functions of the
building.


EXAMPLES

Tower cranes and
communication towers


the Eiffel Tower (Paris,
Francia)

the Sullivan Center
(
Chicago, USA)

THANKS