The Detroit times. [volume] (Detroit, Mich.) 1903-1920, 1911-02-21

In calculations for wind braeing.
the working stresses may be In
cent
Section Is. should new methods
OF construction be desired such as
are not now embodied In this or
dinance. such new methods shall
be submitted TO the Department or
Buildings with full plans. specin-
cations and calculations, and IL
ment. then a full size unit OF the
construction, such as will be used
In the proposed building and con-
sisting of all supporting members.
shall be erected and tested to the
satisfaction OF the Department IL
In the opinion OF the Department
a factor OF safety OF, at least. four
90 shall be developed. the con-
s s,rSet,cn proposed may be APP
ARTICLE III.
Floor and Roof Loads.
Sec. I. MINIMUM LIVE LOADS
REQUIRED. Every floor shall be
Of SUFFICIENT strength to bear safely
In addition TO the weight OF the ma
terial OF which the floor IL construct
ed.
The live loads shall consist OF all
loads other than the dead loads.
The dead loads I'm all buildings
uAiuCtuftsg bnhil COUsIhl OF the
actual weight OF walls. floors. roofs,
partitions and all permanent con-
struction.
Each floor shall be constructed to
carry the following minimum live
loads TN pounds per square foot uni
formly distributed:
Glass !. store Buildings. Light
Merchandise
First floor. 125 pounds: all other
fioors, 100 pounds; store buildings,
heavy merchandise, IT'S pounds:
storage buildings. heavy merchan-
light storage. iso pounds; large
garages and stables. SO pounds.
The floors OF manufacturing
buildings. carrying heavy or fast
running machinery, shall be increased
in strength over the above require
office buildings. first floor. 125
pounds; all other floors. rs pounds.
Class q Hotels. Tenements, Board
ing and Lodging Houses;
First floor. so pounds; Hobbies.
halls, corridors, dining rooms and
vate rooms and apartments, so
pounds; public buildings. first floor,
l26 pounds; all other floors. 90
pounds
Glass 8.
Residences. 80 pounds; small
ShopANo ahd bdiabtb, W DOunQS.
Glass 4. Assembly Halls. Church
es and Church Houses:
With fixed seats, so pounds; with
movable seats, 100 pounds; floors for
dancing, 125 pounds; stairways. 1875
pounds; Hobbies and passageways.
100 pounds.
Schools:
Assembly halls. 100 pounds: class
rooms. 70 pounds; halls and CORR
doris. 80 pounds; stairways, 100
pounds.
All other buildings In this class;
First floor, 100 pounds; all other
Glass 5. Theatres:
With fixed seats, 80 pounds: with
movable seats 100 pounds; stair
ways. l25 pounds: Hobbies and pas
sageways. 100 pounds.
General: r
Attics when not used for habita.
ton. 20 pounds; roofs. 40 pounds;
sidewalks, ESQ pounds.
Sec. 2. REDUCTION OF LIVE
LOAD. In calculating the load on
footings, walls. piers, and columns
in height. the Following reduction
OF the live load OF all floors eek
cept the top or upper floor and the
roofl will be allowed
For warehouses and factories,
,s.sventy-five 06) per cent. Of the
For stores and buildings for
light manufacturing purposes.
seventy (7O per cent. Of the live
For churches. school houses
and places Of public amusement.
seventy (7o) per cent. Of the live
), IN once buildings. hotels.
hon apart% iUaE,nr houses SUu:s
and stables. sixty ssoS per cent.
OF the live load.
Variation from the above re-
quirements may be had only on
frs sse the d s5eApSa 81 0 TLoosE
AND BEAMS. All wooden floor
Ing between two CD Joists or sup
ports. or any floor arch OF brick,
or aImored concrete, or other NIL
Ing between two CD supporting
Joists. beams or Orders. shall be
proportioned to carry not less
than ten t1o) per cent. more 1--we
load. than assumed for such toists.
beams or girders.
All beams. rafters. toists or
girders, shall be proportioned to
carry all of the dead load in add
tion to the whole Of the imposed
Sec. 4 FLOOR LOAD PLA-
CARDS DISPLAYED. 1t shall be
the duty OF every owner OF every
building Of class already con-
structed. or hereafter to be con
occupant OF the building. to pro-
vide, affix and display conspicu-
ously on each floor or such build
ing. a placard stating the load per
SSuars ,, foot a OF floor To- SPACE which
particular floor. and II the
strength Of the different parts of
any floor varies, then there shall
be such placards for each
Il yaryn .Sa,, par. ). of un iasa fo0 e.
load any such floors or any
extent than the load indicated up
on such placards. II shall be the
S SSdn Sf to the ms oHsaRant SUCH Of p Ia.
cards during their occupancy of
the premises, and the owner. OF
the building or his agent shall
cause the same to. be properly
cupancy. These piacards and com
putations shall be verified and APP
buildings before they are afixed
upon the respective floors OF the
different buildings.
ARTICLE XII.
Structural Iron and steel CONSTITUTE
Sec. 1. IRON AND STEEL
STANDARDS. See Article TX,
Sections Is. II and Is.
Sec. 2. PHYSICAL AND CHEM
ICAL PROPERTIES. See Article
Sec. 3. FRAMING OF sTRuC-
TURES. See Article X, Section 2.
Sec. 4. FACTOR OF SAFETY.
See Article X, Section 8.
Sec. 8. UNIT STRESSES. In
all calculations for iron and steel,
the following maximum stresses
will be allowed for safe carrying
capacity:
Medium steel In tension 45%
OF Its yield point and never ex-
ceeding $4,000 pounds per square
Inch. net section.