The Detroit times., 1911-02-20

sooD2

S00D2
P=safe load in pounds per square
inches.
l=length of column I'm inches.
d=outside diameter OF column In
inches.
Ultimate compressive strength
$4,000 pounds per square inch.
Factor OF safety=8.
Wrought iron columns must have
sufficient sectional area so that the
stress In pounds per square inch
under maximum loading shall not
of that allowed for medium steel.
Soft steel stresses shall not ex-
coed eighty-five (S5) per cent or
those allowed for medium steel.
Columns In which the load II
transferred from one section to an
other by metal end bearings shall
be machined So as to give a true
bearing.
Sec. Q. TENSION MEMBERS.
Tension members OF all kinds shall
have sufficient cross sectional area
at all points to support the maxi
mum load coming upon them with
a stress that shall not exceed one
of the material. Where the Soc
tion varies owing to the cutting
OF threads. boring or punching OF
holes or other causes, only the net
section shall be considered.
Sec. 10. TRUSSES. Trusses are
to be considered as combinations
OF compression and tension MEM
ing to foregoing regulations for
such members, and In accordance
with the rules OF practice recon-
mended in September. 1910. by tho
American Bridge Builders Assoc
citation. They shall be riveted or
1T Ina n
Sec. IL. PURLINS. Purlins may
be rolled or built-up sections or
Sec. IL. BEARING PLATES.
Standard steel or iron bearing
plates must be provided under the
wall ends OF all beams, girders,
trusses and columns. of such d.
mension to properly distribute the
maximum load upon the masonry.
according to the carrying capacity,
of such masonry, as set forth In
this Ordinance.
Sec. IS. LINTELS. Lintels in
masonry walls shall be of rolled
shapes or rolled shapes and plates.
Sec. IL. R1vETS. In all riveted
work the holes shall be made one
eighth CID inch larger than the
diameter OF the rivet.
Holes must be accurately placed
opposite each other and no drift
Ing to distort the metal will be
permitted. III the hole requires 10
be enlarged to admit the rivet TX
must be reamed and larger rivets
used.
Holes in steel three-quarter (%)
inch thick or less may be punched
to full diameter required, but Tor
steel OF greater thickness the
holes must be sub-punched and
reamed or must be drilled from the
solid.
Rivets where driven, must COM
pletely I'LL the holes and have the
heads in full contact with the sur
face.
At all bearings. upon or under
the plates. etc, the rivets must be
counter-sunk.
Where possible the rivets must
be machine driven.
Rivet heads shall be OF true
hemispherical shape and concen-
trio with the axis OF the rivet.
Sec. 10. EYE BARS AND UPSET
ROD ENDS. In all pinned struc-
lures the heads OF eye bars and
rod ends shall have upset ends
no weld will be allowed in the
body OF the bar. Steel eyes shall
be annealed ard holes shall be
drilled.
Sec. 1s. PAINTING. All metal
mineral paint before being put Into
Milled surfaces shall not be
Sec. IL. ERECTION OF STEEL
FRAME. In the erection OF steel
frame the various members shall
be kept plumb and true by sum
Client temporary bracing In each
story while the riveting and en-
closing masonry is being done.
sec. Is. STEEL CUT BY OTHER
CONTRACTORS. The working
section OF beams. girders, columns
or other important members shalI
contractors without the approval
OF the Department OF Buildings.
sec. 10. INSPECTION AND
TESTS. The Department OF Build
ings may require az any time SeeeIIs,
inspection from recognized experts,
OF all steel and iron work TO be
used I'm any building.
Tests OF iron and steel shall be
made at the place OF manuiacture'
ished material, and all such tests
where possible shall be made dur
ing the rolling or casting OF the
material. due notice being given
the. Department OF buildings OF
test TO be made promptly so as
not TO delay such rolling or cast
when the Department OF Build
ings desires 10 make shop or Held
inspection OF finished work or ma
terial. due notice shall be given TO
the Department and said Depart
ment shall have such work inspect
ed and certified II possible on the
same day. otherwise on the next
ARTICLE Kill
Reinforced Concrete.
Section 4. EXPLANATION OF
TERM. The term reinforced con-