The Detroit times., 1910-10-05

lime. - h 3 M (.
isisins wS iIs sSsSi = =
Not less than one payt ~ c.
g three CD parts % $50. ~
siss or srsvei. '1 Is g
mixed with the propef pso6651
OF clean water. y "A s lF<
cubic 9 saaos. Il. q seS Sxss ns
machine mixed. {<y- .;<{'{/(.
All concrete shall be uoo1 ln61 -
diatsly after mixing. an1 che u7|<
's see. i II. s e HaE.S 81 ~ mss
made Of Peytisnd esmsSs 3
may BE- saS:sitSssd i'" sxssss y
walls, piers and buttresses 0oo1ol6<
Ing heavy wsightA provided 800
f crr, N &c, cement srish shai! e.;
scribed In this OrdinanoG : ~ 81
Sec. IL. ARTlFlCTAk oToum
Artincisi stone made oe Por11k61
waterproof material, ,snsy s. 1SS
40 q substitute ler any natuSS|
stone. But no ARTIFICIAL btonS S6SI
osn, more more than nftssn (1yl y9g4
shall be used - = Intel q bSSf5a2 n
part Of any building over four (1/;
the tests for materials prscsfibe '
! In this Ordinances = - - - N
vs Sec; "a, WRoGeHr IRox xlS':
!: toush ana ductile. uniform 4; SS"~t v
: acter and having an intimate ~ ~ &
sis strength OF NOT less tka3 q
rorsyseight Thousand (As.o005
or comraerciai elastic limit twsSfvs ~
SIX thousand Cocoon poundn ~
an eiongation- OF eighteen (iS) SS5H1
fracture whsn tested in smSI ~
/, Sec: a. CAST IRON Escs.i q
) casti r n~ sh sbe Iron e specinsd sl1:e
free from Injurious 'u cola s. .Sus 1ss 3
: n ns Ing an an, ultimate tensile strsnSsi q
9 Ns.ooo) pounds per square inch.- n -
y sample pieces one (il inom G]
! m SasIe' +, cast sa from the same heat ~
: capable OF sustaining on : cleS5x I
span OF four ca feet and eight al
I a inchies; a central load OF ave hun5e1
& the the ro MSy, pounds when trstsd -!
SEQ 10. STEEL cAsrrNco ss..ef' ).
Saunss shall be made by the obS M
hcartn or crucible process and sksik4|
ana shall have the foiiowinr mis3x|
mum requirements: 741
neaied -
3 Sample bars to develop az l<asn
. an ultimate strength 81 ssvSrsv u
thousand T0.6O0) pounds 49, W.
square inch. with q Yield point ~ q
= commercial elastic limit OF thirty1
< one thousand five hundred {si, s0elfcI
% pounds per square inch and A q
. eionsation OF eighteen u0) pS1r a
. cent In two CD inches. includin2 q ~
% LIactuTe and reduction OF twenfy,<<
Sec. IT, per sT ssns n srss. sr~r, q
All structural steel including rivetS D.
shaii have their physical and chsnaS;S
icai properties I'm accordance WITH n
the manufacturers Standard Steel e
Z February 9. 1903. ant As found 1Ss'
turers. - >,rv.z
Sec. H. TESTS The 1spart5 e
any time. certified copies Of fulIr
inspection from recognised export1rrx
for any or all materials used ,l]SS2
buildings OF Types ! and and ~
or built upon. until the Dspart8 p
ment OF Buildings. upon their resf,
o quest. shall have been furuisb{ ~ ~
( with satisfactory proof that suc1[r y,
n.,,.e ana workmanship ARR
n. Sec. H. NEW MATERIAI8 Ho4
2 Tore any new materials not hete< "a
tofore employed are used ~ cone
structional parts OF BUILDINGS 81
structures. permission must 30 ob-.8
tanned from the Department. Of
Buildings, who shall apply such,
tests to the said new materials az IT
may be necessary to determine thG1sz
9 strength and durability OF apclS ~
! materials.
ARTICLE Y.
Calculation of stresses.
Section l. CALCULATION oVo1
CONSTRUCTION. The stresses %
materials hereafter used In thGR1
: construction Of buildings or struc<ot'
lures, shall be the caicuiatedfel
stresses due to the dead load" ~
plus the live load sv9
The allowable factors or units o1fe&
safety, Tor the dimensions Of each -
% piece or combination OF materiaIsxA
required In building or structure II
shall be ascertajned by computatioEft7
according to the rules prescribed13l
o By the modern authorities on nia&o1<
. teriais, applied mechanics, and sn-sa'
Sec. q. TEST OF FRAMEs.sni
When q test OF any framed struc&Dl
ture is required TO ascertain Ito
Z physical strength or its resistance
to Are, frost or water, such Test
shall be made with full finished
sizes, and q similar exposure -
their proposed use In the building
requires. and when the condition
% for such tests are not established
1 in this Ordinance. the method OF
2 the authorities prescribed In The Al
3 previous sections shall be followed
Sec. 3. FACTORS OF SAFETY. j,
2 In computing the working stresseq
8 In the framing OF any building uaxtA
less the safe loads are prescribedk ~
s I'm this Ordinance, the following .a(
factors OF safety shall be used: sbx
z For cast iron or steel subject to ~
compression or tention or transsc 30
o verge strains, J. .s9-
o For cast iron subject to tentioR "A
1 or transverse strains. 10. ARD
2 For cast iron subject to compress n
8 sion for plates and columns or orr e
binary or short length according &c
8 to the uniformity OF the thickness W
8 OF shell. TO s. rs
8 to the uniformity OF the thickness
8 OF shell. to 10. sss
10 For timber subject to tension =
Il anu transverse strain. 9.
y For timber compressions In short Z
- columns or posts, 7.
"A For timber In long columns or
g Natural or artificial stone on ma
II sonry, 10. ~
Is For framed structures composed 4,
10 OF two CD or more pieces or the
10 same material. combinattou
n OF two CD or Inore pieces OF difs<.
q ferent materials. such as 1raine4 ~,
g OF all kinds. brackets, cantileverssfs ~
A trusses and archud fiooIs, or trus- ~
QrfnnrNH concrete