The Detroit times. [volume] (Detroit, Mich.) 1903-1920, 1910-12-07
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;, P=safe load la pounds per saanre
% inches
80 l-length OF column In inches.
30 d-outside diameter or column IN
~ inches
- Ultimate compressive strength
~ 10000 pounds per square inch.
81 Factor Of safety
80 Wrought iron columns must have
80 sufficient sectional area 30 that The
3, stress Ia pounds per square inch
5s under maximum loading shall NOT
80 exceed seventy-fve $50 per cent
40 OF that allowed for medium steel.
Al Soft steel stresses shall not ex.
AZ coed eighty ive (s5) per cent OF
81 those allowed for medium steel.
"a Columns In which the load IL
as transferred from one section TO an
AZ other by metal end bearings shall
Il be machined So as to give true
IS bearing
Sec. y. TENSION MEMBERS.
Tension members OF all kinds shat!
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
: quarter (A) OF the breaking sire 80
OF the material Where the sec
y ton varies owing to the cutting
10 of threads. boring or punching OF
IL holes or other causes. only the mex
l2 section shall be considered.
Sec 10. TRUSSES. Trusses are
to be considered as combinations
3 OF compression and tension mem
1 bers, and shall be designed accord
ing to foregoing regulations Tor
such members, and IN accordance
with the rules OF practice recon-
mended In September 1910. ny tho
. American Bridge Builders Asso-
10 citation. They shall be riveted or
IL pinned structures. as determined
IL BY the conditions.
See. ii. PURLINS. Purlins may
be rolled or bu.lt-up sections or
Sec. II. 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.
6 mension To properly distribute the
Z maximum load upon the masonry.
according to the carrying capacity,
3 Of such masonry, ~ set rorth III
~ Sec. Is. LINTELs. IAnteis In
masonry walls shall be OF rolled
shapes or rolled shapes and plates.
See IA RivETS, In all riveted
work the holes shall be made one
3 eighth Nsl inch larger IMAM the
diameter OF the rivet
E Holes must be accurately placed
q opposite each other and no DRIFT
: Ing TO distort the metal VIII Dc
permitted. if the hole requires 70
be enlarged to admit the rivet IL
10 must be reamed and larger riVets
II Holes In steel three quarter q
IL inch thick or less may be punched
Ia TO full diametes required but Tor
* steel OF greater thickness the
IL holes must he sub punched ana
II reamed or must be drilled from '"s
Is solid
10 Vivets where driven. must com
20 pletely All the holes and have the
2l heads In full contact with the SUIT
10 face
90 At all bearings, upon or under
"a the plates. etc, the riVets must po
81 counter sunk. 49, ,.,
~ be machine driven.
% Rivet heads shall be OF true
% hemispherical shape and conceh-
80 tr,c with the aNis Of the TSst,;
Sec. IS EYE BARS AND Ufaf.I
ROD ENDS. In all pinned struc.
: lures the heads Of eye bars ana
4 rod ends shall have upset ehos
5 no weld will be allowed In the
body of the bar. Steel eyes shali
he ,nnealed ard holes shall he
Sec ls PAINTING All metal
shall have at least one coat OF
3 mineral paint before being put INTO
) Milled surfaces shall not be
Sec Il. ERECTION OF STEEL
. FRAME. In the erection OF STE,
frame the NdfiouS
4 be kept plumb and true py SUN
? Gent Temporary bracing In each
3 STOW while the riveting and en-
: closing masonry is being done ,,,p
c, Sec; =, scr STEEL cT The By w Working
: section OF beams. girders. coiuinns
4 or other important members shail
5 not be cut or punched oy ONE
8 contractors without Z, 1 Ru,,dinss.
OF s .,ro "a INSPECTION AND
rE ssf; ' The Department Of Build
ings may require az any I'M ne acid
Z insuect Ion from recognized experts,
q Of ali steel and iron work 10 oe
7 used In any building
Q Tests OF Iron and steel shali DO
o nade at the place of manufacture.
"a from tests pieces cut from the nm
~ isbed material. and all such tests
i where possible shalf be made our tbe
"a ing the rolling or casting OF tne
"a Material due notice being given
~ the Department OF Buildings OF
iS such rolling or casting ana the
II test to be made pr0inptF
"a NOT TO delay such rolling or cast
% when the Department OF Build,
81 inus desires TO make shop or neIu
% ,nsnection OF finished work or ma
~ tnplaI due notice shall be given TO
% the Department anu sara Depart
OK ment shall have such work ihspeIt-
81 cd and certified II possible on the
OF Gay, OtllfiN VIZ
> way ARTICLE XIII.
reinforced Concrete.
section /. ENPLANAIloS or
, TERN TIE term reinforced con-
a crete" shall be understood TO mean
4 an approved concrete mixture re-
R Enforced by steel or iron or any
shape, 80 that me steer ana ss ,se.
3 and assist In the resistance TO com
preston and shear ~ D,u
Sec. 2 PERMITS AND DRAW
IN,iS Complete drawings: speci-
2 rcations and details of all rein
4 forced concrete construction, snow
s ing the size and position or all re-
6 inforcing members. shall De nieu
with the Department OF Buildings
before n permit to construct such
9 work shall he issued. For all
10 buildings, strain sheets must be
II submitted with the drawings ana
n The live loads in pounds per
IA square foot for which the different
IL members are designed. shall be
Sec. 3. METHOD OF CALCULA-
TON. In calculating the strength
2 OF reinforced and plain concrete
floor construction or for nreproof-
ing, the thickness OF the concrete
: ONLY shall be used exclusive OF any
mastering or floor ballast.
Reinforced concrete slabs. beams
10 aud sirders. shall he designed in
IL accordance with the following as
II SYMPTOMS,
IA ,aJ The accepted theory OF nex-
- ufe shall bc applied To all mem
IL bers resisting bending.
ic OBJ The steel shall take all the
II tension stresses.
rs eel The ratio OF the modulus or
IL lasticity OF concrete 10 that Or
20 steel shall be I 10 IS.
Fl td) Tir~ modulus ~ elasticity
- -. AZ al =