The Daily Ardmoreite. [volume] (Ardmore, Okla.) 1893-current, 1907-09-15

steel resists the shrlnkage and pre-.
vents the cracks The result o.
these and other discoveries "a.
that the combination Of steel and
concrete ~as studied and from these
studies have developed the modem
systems Of so-caIied reinforced 3r
arm0-ed concrete
Today there are scores Of sys-
tens based on certain vel known
laws zach system has i,s o~r
methods % aiming ,1s sane md
aai each system -r.e- % accomplish
.aese ends either iH some parlc.
o-a-ly economical ~ag CT 5y some
method Ea.ch may be- patented.
The theory on which ali ,hs re-
.a'orc-d concrete is -.s.ened is H
Itself very slup.. one "a an,
steel or wooden truss sJl.e C.. the
members O.. pieces COMPOSING it are
s-1.ec, 90 fl.Iag force % are
Intensive The other members ere
subject '5 forces % pressure o- are
.lcJ- f-e-s.tl-.
"Whe1 a wooden b-am is loaded
:he n9fes @: the laders.dg are h.
.eus.5.e. and those 5, the upper side
ilcouF uFrer-us.tl-. 10 designing a con.
/ cr te ;slss 1r beam ~e Use slfi.
! c.el. alC-a; @: steel 20 take the
tensile strains and use concrete
20 AXE comprehensive strains. This
j. The whole Thing IN nutshell
| Take tie cas- O: a simple beam.
steel rods are So placed that they
come .n The line o' greatest ten.
sion The amour, O.; this tension
is accurately figured and the
amount o: steel Is JUS; enough 70
Do The WOrk IN the proper way.
Where there Is a concrete floor
The amour; Of steel aad the thick.
ness Of the concrete are d ;ermin.
I'd 5y the span and the load which
il Is necessary for the floor 10
carry. The steel reinforcement may
be In the form o, rods Of expanded
metal o. eleciric.welded fabric, or
any other form Of steel which is
adequate for the work. IL concrete
Is properly portioned, properly mix
ed and PLACID, and II the steel is
properly designed and put in In &C
cordance With the designs such q
concrete floor will safely carry the
full load for Shch II Is figured.
You will notice that ! repeated
the word properly again and again
and this Is because every failure o.
reinforced concrete which has takeI
place 70 date has been caused b!
something which vas not proper
The most frequent causes OF fail
ure In the comparatively few build
ings where accidents have occurred
, has been the careless placing 0
the reinforcement. Some OF n
buildings were not properly design
Z ed. some have failed because th
4 cement used va. not Of good qual
1 ity; others because the mixture wa
not properly proportion d. and 81
! on. There has never been failur'
A in any building done as il shoul,
4 have been done.
The benefits OF concrete construc
, tion. the reasons why 1t is probable
that reinforced concrete will soon b,
our chief material for the consruc
tion Of buildings are very numerous
First-The cost OF timber is in
. creasiug rapidly and the forests ar,
being depleted with little hope o
renewal.
Second-The material Of whicl
concrete is made is steadily growing
cheaper
Third-Concrete is substance
which will not burn, and build
: ing constructed entirely OF con
crete is practically fire proof.
Fourth-Concrete buildings can b,
built very rapidly.
Fifth-The older the concrete. IN,
stronger and better it gets. Fol
these reasons concrete is continu
= ally growing stronger while an!
. wooden or partly wooden structur,
Is continually depreciating in every
way.
At the present time our firm
! has under construction eight build
iugs which are either wholly or in
part reinforced concrete
For instance, one OF these build
ings is a fourstory wholesale gro
Gerry warehouse. The first floor Is
calculated for a safe load OF i00
pounds per square foot. The second
floor 300 pounds per square foot
and the third and fourth floors l50
pounds per square foot and the
roof IS pounds per square foot