The Detroit times., 1910-10-05

! LOAD. b ealeulating the load on
s n;. P's scf.s enc 9, ss ssorie:
s 81 the live load 0f all noors Tax
Z cept the top or upper moor ana the
seventy ny Sss sssS per cent q IN:
: For stores and buildings for
3 light manufacturing purposes.
I seventy (7o) per cent. OF the live
8 For churches. school houses
and places Of public amusement.
8 seventy (7o)f per cent. OF the i've
: a IT once y s :, msns h nSssis
2 Tenement houses. lodging houses
5 and stables.. sixty tSO per cent
a OF the live load.
IS Variation from the above re-
n special and written permission
g from the department. OF bulidinKss;
Sec. 3. LOADING OF FLOORS
AND BEAMS. All wooden floor
3 ing between two CD Joists OF SUP
s tile or concrete. or any reinforced
& or armored concrete. or other NIL
I ing between two S2) supporting
joists, beams or girders. shall De
Q han ten -tio) per cent. more live
1 load. than assumed Tor such Joista'
2 beams or girders.
8 All beams. rafters. 1oists or
4 girders. shall be proportiGneaa d 70
6 ton TO the whole Of the imposed
Sec. A. FLOOR LOAD PA
. CARDS DISPLAYED. 1t shall be
! S sns nn,y Of q class ]. already con-
structed. or hereafter to DO con-
6 structed. or of his agent or OF the
I occupant Of the building. TO pro-
vide. affix and display consp,SSS
Q ing, a piacard stating the load per
. may with safety be applied 20 that
8 particular floor; and II tn ns
s any door varies. then there shall
! Varying part Of such h., door c
Io. =, any Sy.,s such 10 door: or sres sny
Z i e ests shs sns9 n. load indicated up
. on such placards- 1t shall be the
3 duty OF the occupants OK the
4 building to maintain such pia,,
Z the premises, and the owner Of
Il the building or his agent shall
g cause the same to- be properly
2 affixed with each change OF oc-
Q cupancy. These placards ana com
2 proved by the department. OF
3 buildings before they are amxed
a upon the respective doors OF the
s different buildings
ARTICLE XII.
sructuraI Iroa and steel Construction.
Sec. 1. IRON AND STEEL
9 STANDARDS See Article Ix.
Sec. :. PHYSICAL AND CHEM
. IcAL PROPERTIES. See Article
Sec. 3. FRAMING OF sTRuc-
TYRES sd See SAc aFt,fl' * * s sSsGrf.
Sec. 5. UNIT STRESSES. In
2 all calculations for iron and steel.
8 the following maximum stresses
will be allowed for safe carrying
8 Medium steel in tension 4o%
Z of its yield point and never ex-
8 ceeding $4,000 pounds per square
8 inch. net section.
1 pounds per square inch. net sec
8 Medium steel In compression:
4 The safe loads as computed by
in the standard Steel Manufac-
Z turers' Hand Book or IN Text
8 Books on Standard Framed Struc-
Q Shop Rivets: L-
inch. sSs s..ris ss'' 1920, ~: PEI ID. :sas:;
) square inch. -.
4 Field Rivets: 49,
Shear. $500 lbs. per square
s Inch; Bearing. 1900 lbs- Per
I square inch
8 Field Bolts:
3 Shear. 5000 lbs. per square
o inch; Bearing. $4,000 lbs. per
square inch.
8 Tension. $4,000 lbs Per square
Compression. - For columns
8 and struts seventy-nvS lIeo per
s medium steel. - 1.0 ~
Cast Iron:
inch: ' ss:sa: 500 i Is. Per Per :SSsr:
8 Compression.-Ths safe loads
4 as computed by column and strut
5 formulea az given IN the standard
6 Steel Manufacturers Hand Book.
Sec. 8. DESIGN. All steel franz
Ing shall be d: ;s led. where p.ss.
I coincide with the gravity line OF
rolled and built-up sect1ons, avoid
9 ing eccentric loading.
z Where eccentric or irregular
stresses must be carefully calcu-
lated and proper material provid-
/ cd 20 care for such loading. using
3 any Of the applicable formulea
Z set forth in standard Text Books
8 on Steel Framed Structures.
8 All connections must be de-
q signed TO safely transmit the
9 supeEimposed loads :,
70 shop work and for all field work
Il whore practicable.
q Where bolts are used In shear,
3 care must be taken to have all
sos lime II ' saa n. Ss.rnx Of tine
Is threaded portions Of q bolt shall
"a not be taken into consideration in
9 calculating the strength OF the
= Sec. =. BEANS AND ORDERS
. For beams and built-up girdsri
the maximum fibre stress shall not
exceed one-quarter (A) OF tn.
8 breaking stress Of the material
when computed according to the
following formulea:
3 my
10
Il Fibre stress In pounds pei
70 square inch.
IS M=bending moment in inch
- pounds.
u y=dlstance In inches from cen
Is ter OF gravity Of section TO ex-
Ia treme hbre.
Is moment OF inertia of the net
10 cross section of section at the poin,
10 In consideration, In tnohes.
II The compression dange of Q
~ beam or gir1er shall be considered
70 as acting a. q column and shall
"A not be allowed to be unsupported
IS laterally for q distance exceeding
IS thirty (30) times In inches the
~ width of the fiange In inches.
IS Plate girders shall be provided
10 with ample stiffeners 10 prevent
10 buckling OF the web.
II Where one or more beam shapes
II are assembled they are to be bolt