The Detroit times., 1910-10-05

z stross In poundo Der square tncn
: under maximum loading snsh nos
: 81 sfe sss, allowed Tor medium steel.
! Soft steel stresses shall not OK.
coed eiGhty-nve (sD per cent OF
those allowed for medium steel
4 Columns In whtch the iosa
s transferred from one section 20 iii
\ be mnchinsd 80 az to give true
. oe see TENSION MEMBEIts.
2 Tension members OF all kinds shaii
8 have suficient cross sectional area
4 at all points TO support ,ns ss,,n
n stress that shall not exceed one
quarter (h) Of the breaking stress
Of the material. Where the Sec
Q ton varies owing TO the cutting
0 OF threads. boring or punen nm n Of
1 holes or other causes. only tne net
section shall be considered.
Sec. 10. TRUSSES Trusses are
2 TO be considered az combinations
3 OF compression and tension mem
4 beers. and shall he designed accord
s Ing TO foregoing resuia.ions 80
6 such members. and In accordance
7 with the rules Of practice recon-
3 mended in September. 1910, by the
q american Bridge Builders Assoc
o citation. They shall be riveted or
l pinned structuIes. as determineo
Sec IL PURIINs Purlins may
2 be rolled or buiit-up sections or
Sec. IL. BEARING PLATES.
Q Standard steel or iron eearihs
q wall ends of all beams. girders.
& trusses and columns. OF such OIL
mensiou 10 properly distribute the
7 maximum load upon the masonry.
8 according TO the carrying capacity,
9 OF such masonry. as set iortn In
'hs Sec Is. LiNTELs. Lintels In
q masonry walls shall be OF rolled
4 shapes or rolled shapes and plates.
Sec. Ia RIvETS. In all riveted
2 work the holes shall be MADE one
s,sms,eS r ;. IN, then r, ,aass' '"-A
{ Holes must be accurately placed
: opposits each other and no dritt-
ing to distort the metal Will DC
= permitted. II the hole requires 20
3 be enlarged to admit the rive. ~
0 must be reamed ana larger f'e''
| used. .x,
: inch thick or less may be puhcneo
. 10 full diameter required, put .or
5 steel OF greater thickness IA.
4 holes must be sub-punched aho
rsamsd or must be drilled from the
8 solid. .or.
a pletely All the holes and have the
! heads in full contact with the sur
2 face. a.r
1 the plates. ETC.. the rivets must Do
! Where possible the rivets must
be machine driven. ,,.
J Rivet heads shall be Oh rne
! hemispherical shape and conceh-
q tric with the axis OF the rivet.
Sec is. EYE liars AND UPSET
, ROD ENDS. In all pinned struc
: lures the heads of eye bars ana
rod ends shall have upset eno n.
5 no weld viii be s siiowe sxs IN shall
he anneaied and holes shall ne
or sse 1s. PAINTING. All metal
, .bau have at least one coat %
mineral paint before being put f''o
! ou Miliad surfaces shall not be
pa sse IL. ERECTION OF STEEL
\ FRAME. In the erection OF steI,
3 frame the various members s..
1 be kept plumb and true % zach
s,orv while the riveting and en-
: cio.in9 masonry II being done,
Gee is. STEEL CUT BY OThEE
, CONTRACTORS. The J,,,,,ns
section OF beams giroers, anal
or oSne cut or punched by other
NOV rec,ors without the approval
of the Department OF gyiiSinsA ND
sss; II h. peusrtment of Build
inrs may require at any time. Ger Ger
2 tavssa COPIES of mill, shop or neto
! inspection from recognized eApe -:
Of all steel and iron WORN 70
: tests Of iron and steel shaii De
uade ar the place Of manufacture.
4 from tests pieces cut from the M
ished material. and All suoh . aur.
WI the rolling or casting of the
msteriai. due notice being given
the Department Of Buildings o.
such rolling or casting and tne
I test TO be mace pr9tnpr cast-
when the Department Of Build,
= ,rrs desires to make shop or nelo
3 inspection Of finished Work or NM "a
the Department and said Depart
( ment shall have such work inspect
< ed and certified II possible on the
Z same day, otherwise on the next
8 day.
ARTICLE XIII.
Reinforced Concrete.
Section 1. EXPLANATION OF
. TERM The term reinforced con-
a crete" shall be understood 10 mean
4 an approved concrete mixture. re-
S inforced by steel or Iron or any
8 shape. 90 that the steel and Iron
viii take up all tension stresses.
and assist In the resistance TO COM
sec. Z. PERMITS AND DRAW
2 IN0S. Complete drawings: speci-
4 fications and details OF all rein
forced concrete construction. show
s ing the size and posiuon OF All as re-
Z with the Department OF Buildings
before a permit TO construct such
work shall be issued. For all
o buildings, strain sheets must De
i submitted with the drawings ana
& The live loads in pounds per
a square foot for which the different
IS members are designed, shall be
ID marked on each and every moor
II plan OF the drawings submitted
Sec 3. METHOD OF CALCULA-
TON. In calculating the strength
used for walls, columns. beams.
moor construction or for nreproof-
ing. the thickness Of the concrete
only shall be used exclusive OF any
plastering or door ballast
Reinforced concrete slabs, beams
9 and sirders. shaii Be oS ncs,snso an IN
< 1a) The accepted theory Of HEX
ure shall be applied TO all men,
Is bers resisting bending.
6 (b) The steel shall take all the
4 tension stresses.
g elasticity to that Of steel shall be
Il td) The modulus of elasticity
2 shall remain constant at all WORK.