The Detroit times. [volume] (Detroit, Mich.) 1903-1920, 1910-10-05

; sxcsed seventy-nvs (I5) per cent
Of that allowed for medium eSeei-
/ Soft steel strsssss shall not OK.
z cesd siehty-nve (6b) per cent 81
8 those allowed for medium s ,csd !.
S transfered from one section 60 an,
{ other By metal end bearings shall
I be machinsd 90 a. to give true
Sec TENSION MEMBERS,
2 Tension members OF all KINDS snal'
: have ssfficient cross sectional sreA
Al all points 10 support the maxi
5 mum load coming upon them WIN
q a stress that shall not exceed ONE
7 quarter (A) OF the breaking stress
of the material Where the see-
3 tion varies owing to the su.,'ns
. OF threads. boring or punching o.
/ holes or other causes. only the net
, section shall be considered.
Sec. 10. TRuSSES. Trusses are
? 10 be considered as combinations
! OF compression and tension mem
/ bers. and shall be designed aeeosu-
ing to foregoing regulations TOT
such members. and In accordance
with the rules OF practice recon-
mended in September. 1910, by the
american Bridge Builders Asso-
citation, They shall be riveted o,
pinned structures. as deter"ihea
Sec. IL. PURLlNS Purlins may
be rolled or buiit-up sections OF
Sec ~. BEARING PLATES.
Standard steel or iron bearing
plates must be provided unoer tue
wall ends OF all beams. gfrders'
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 torth y"
ssc IA. LINTELs. Lntels In
masonry walls shall be OF rolled
shapes or rolled shapes and plates.
Sec. IA. RIvETS. In all riveted
work the holes shall be made one
eighth th) inch larger tnan the
diameter OF the rivet.
Holes must be accurately ptaceo
oprosits each other and no DRIFT
fnx to distort the metal Will De
nermItted. IL the hole requires 20
he enlarged to admit the rivet "
must be reamed and larger rivets
used m,
inch mick or less may be punched
10 full diameter required. out TOT
steel of greater thickness the
holes must be sub-punched ana
reamed or must be drilled from the
solid. .o,..
heads in full contact with the sur
Al all bearings. upon or under
the plates, etc. the rivets must oe
couuter-sunk-
Where possible the rivets must
be machine driven, -, ,ru.
Rivet heads shall be OF uue
hemispherical shape and conceh-
trio with the axis OF the rivsI
Sec i5. EYE BARS AND UPSET
ROD ENDS. In all pinned struc
lures the heads or eye pars anu
rod ends shall have upset eho sh.
NV NO ~ the bar. Steel eyes shall
he anneaIed ard holes shall ne
See ls. PAINTING. All metal
shau have at least one COAT %
mineral paint before being put INTO
Miiled surfaces shall not be
ssc II. ERECTION OF STEEL
PANE In the erection or stev,
frame the various members sna'
be kept plumb and true py nn
cient temporary prav,nx sna en-
closing masonry-is being done;
Sac is STEEL CUT BY 9TH Eh
~<,TTp cToRS. The working
section OF beams. Orders, coiun
or other Important ine.S 49,
not be cut or punched py otne
Contractors without the approval
of the Department OF Bulidinss.
Sec IL. INSPECTION AND
TTSTs. The Department OF Build
inrs may require at any time ce.
tined copies of mill. shop or ne,u
srspection from recognized exper,s,
~ all steel and iron work 10 oe
used in any building.
Tests OF iron and steel shAIi ue
made at the place of manufacture'
from tests pieces cut from the nm
ished material. and all such tests
where possible shall be made our
, ing the rolling or casting OF .ne
me,erial due notice being given
The Department of Buildings OF
sucb rolling or casting and tne
fest to be made promptly SO as
not to delay such rolling or cast
ing. . ., Ru,,d-
inrs desires to make shop or neio
inspection OF finished work or ma
teriaL due notice shall be given 10
The Department and said Depart
ment shall have such work inspect
ed and certified II possible on the
same day. otherwise on the next
day.
ARTICLE Kill