The Detroit times. [volume] (Detroit, Mich.) 1903-1920, 1910-12-07

sOOI)2

20 inches.
20 Length OF column In inches.
80 d=outside diameter OF column In
81 inches.
l2 Ultimate compressive strength
10 10000 pounds per square inch.
- Factor OF safsty=e.
35 Wrought iron columns must have
SO sufficient sectional area 30 that me
SS under maximum loading shall not
80 exceed seventy nve (76) per cent
40 or that allowed for medium steel
III Soft steel stresses shall not sx.
az coed eighty-nve (S6) per cent or
SO those allowed for medium steel.
"a Columns In which the load u
IS transferred from one section to an
~ other by metal end bearings shall
~ be machined 50 as to give true
Sec .. TENSION MEMBEts
Tension members Of all kinds shall
have sufficient cross sectional area
at all points To support the maxi
6 mum load coming upon them with
9 a stress that sheil not exceed one
quarter I'd OF the breaking stress
s OF the material Where the sec
tlon varies owing to the cutting
10 OF threads, boring or punching OF
IL holes or other causes. only the mex
IL section shall be eons'dered:
2 to be considered as combinations
3 OF compression and tension mem :
bers, and shall he designed accord
ing to foregoing reguiations Tor
6 such members. and In accordance
with the rules OF practice recon-
S mended I'm September. 1910, by the
Q American Bridge Builders Asso-
10 citation. They shall be riveted or
IL pinned structures, as determined
- by the conditions ,
Sec. IL. PURLINS. Puriins may
be rolled or built-up sections or
z truesed angles.
2 Standard steel or iron bearing
3 plates must be provided under the
wall ends Of all beams. girders
trusses and columns. OF such d.
s mension to properly distribute the
Z maximum load upon the masonry
according to the carrying capacity,
Of such masonry, as set rorth /"
Sec. IS. LINTELs Llntels IN
2 masonry walls shall be OF rolled
9 shapes or rolled shapes ana pIstes:
SEC. IA RIvETS. In all riveted
work the holes shall be mace one ne
3 eighth (h) inch larger than the
4 diameter Of the rivet.
2 Holes must be accurately placed
4 opposite each other and no driIt-
Z ing to distort the metal VIII De
y permitted. IL the hole requires 20
10 must be reamed and larger rl'els
II used. m,
~ Holes in steel three-Quarter "a
IL inch thick or less may be puncheu
IA TO full diameter required, put .or
is steel OF greater thickness inc
Is holes must be sub-punched ana
II reamed or must be drilled from the
Is solid.
10 Viyets where driven. must com
20 pletely M the holes ana nave tne
u heads in full contact win tue SUI
% At all bearings. upon or under
"a the plates. etc. the rivets must 10
20 counter-sunk, 1890,
81 be machine driven.
2s Rivet heads shall be OF true
20 hemispherical shape and conceh-
40 tric with the axis OF the rivet;
Sec, IS: EYE vA al p; AND u ,,1nc-
ROD ENDS. In al! plnheea ars and
I rod ends shall have upset ends-
K no weld will be allowed In the
= body of the bar. Steel eyes shs l
be anneaIed ard holes shall he
o Sec 10. PAINTING All metal
= shail have at least one coat Oh
3 mineral paint before being put INTO
building. ha
D pa sec i. ERECTION OF STEEL
o FRAME In the erection OF ster,
4 frame the various members shni
4 be kept plumb and true by sun
8 Client temporary braclng IN
. sio,ins masonry Is being done;
SEC IL STEEL CUT BY OTHER
coSTeACTORS. The working
2 section of beams, Orders. co'uinnSI
or other important memo ev othsr
= Characters without the approval
7 OF the Department Of B4i,dinsss.
Sec 10; INSPECTION, pn nEp
5 ings may require at any time e seI,
tiSed copies OF mill shop or neld
8 inspection from recognized eNperts,
OF all steel and iron WORK 10 oe
: used In any building
: Te.ts OF iron and steel shall be
made at the place OF MANUFACTURE
% from tests pieces cut from ,he M
n ished material, and all sue. tests
q INC the rolling or casting OF the
a n,atsrial due notice being given
Il the Department OF Buildings OF
Is such rolling or casting anu 'a
e not to delay such rolling or cast
10 When the Department OF Build.
n inss desires TO make shop or neio
70 inspection OF finished work or ma
"a terial. due notice shall be given 10
"a the Department and said Depart
~ mant shall have such work inspect
"a ed and certified IL possible on the
,S day.
Reinforced Concrete.
Section /. EXPLANATION VI
= crete" shall be understood to mean
nm approved concrete mixture. re-
s inforced by steel or iron or any
s shape. 80 that the steel ana r. ,s.n
& and assist In the resistance TO COM
q nrcssion and shear
See . Permits AND DRAW RAW,
. IN,iS Complete DRAWINGS spec
2 ncations and details OF all rein
forced concrete construction, show
4 ing the size and position OF all re.
g inforcing members. shall be hied
with the Department OF buiid,ms ms
9 work shall be issued. For all
10 buildings. strain sheets must be
ii submitted with the drawings and
IL specifications.
ia square foot for which the different
II members are designed. shall be
ls marked on each and every floor
II plan of the drswi1s pr s1 ns1SIm
. TION. In calculating the strength
2 OF reinforced and plain concrete.
4 used for walls, columns. beams
s floor construction or Tor hreprooi
q ing. the thickness OF the concrete
7 only shall be used exclusive or any
8 plastering OF floor ballast.
= Reinforced concrete slabs. beams
10 and sirders, shall be designed In
ii accordance with the following as
H. SYMPTOMS:
IA (a1 The accepted theory. of fex-
IA ure shall b. applied 10 all mem
H. bers resisting bending.
lG (b) The steel shall take all the
II tension stresses.
is (cl The ratio OF the modulus OF
IL elasticity of concrete TO that ~
"a steel, shall be I to Is y
II tdD The modulus OF elasticity
~ shall remain constant at all work
e3 ing stresses.
"a Ce) The stress strain curve OF
20 concrete In compression shall be