The Detroit times., 1911-02-23

ture. additional bracing shall be
introduced sufficient 10 make up
the difference In the moments.
In calculations for WIND bracins.
creased by twenty-nve i2o per
cent
section rs, should new methods
or construction be desired such as
are not now embodied IN this orr
dinance. such new methods shall
be submitted 10 the Department OF
Buildings with full plans. specifi-
cations and c-ealculations, and IL
ment. then a full Size unit OF the
construction. such as will be used
In the proposed building ana con-
sisting OF all supporting members.
shall be erected and tested TO the
Satisfaction OF the Department. III
In the opinion OF the Department
"A factor OF safety OF. at least. four
90 shall he developed the con-
struction proposed may be ap-
proved"
Floor and Rosf Loads.
See. !. MINIMUM LIVE LOADS
REQUIRED. Every floor shall he
OF sufficient strength to bear safely
the weight TO be imposed thereon
in addition 10 the weight of the ma
terial OF which the floor is construct
cd.
Tho live loads shall consist OF all
loads other than the dead loads.
The dead loads I'm all buildings
and structures. smtli consist OF the
actual weight or walls, floors. roofs.
partitions and all permanent con-
struction.
Each moor shall be constructed to
carry the following minimum live
loads In pounds per square foot uni
formly distributed:
Class ]. Store Buildings. Light
Merchandise:
First moor. 125 pounds; all other
floors. 100 pounds; store buildings,
heavy merchandise. 175 pounds:
storage buildings. heavy merchan-
dise. zoo pounds; manufacturing and
garages and stables SO pounds.
The floors of manufacturing
running machinery, shall be increased
in strength over the above require
ments.
office buildings, FIRST floor, 1875
pounds; all other floors. 70 pounds.
ing and Lodging Houses:
First floor, so pounds; lobbies.
halls. corridors, dining rooms and
other public rooms. so poundsi pri-
vate rooms and apartments, so
pounds; public buildings. first floor,
125 pounds; all other floors. 90
pounds.
Class g.
Residences. so pounds small
stables and garages. so pounds.
Class :. Assembly Halls. Church
es and Church Houses:
With fixed seats, so pounds: with
movable seats. 100 pounds; floors for
dancing. I25 pounds stalrways. 1875
pounds; Hobbies and passageways.
100 pounds. fA
Schools:
Assembly halls, 100 pounds: class
rooms. rs pounds: halls and CORR
doris. 90 pounds: stairways. 100
pounds.
All other buildings in this class:
First floor. 100 pounds; all other
Class 8. Theatres.
With fixed seats. so pounds: wit
movable seats. 100 pounds: stain
ways, 125 pounds: Hobbies and pas
sageways, 100 pounds.
Attics when not used for hablta-
ton. 20 pounds; roofs. 40 pounds:
sidewalks. $50 pounds.
Sec. 2. REDUCTION OF LIVE
LOAD. In calculating the load on
footings, walls. piers. and columns
in buildings over three CD stories
in height. the following reduction
or the live load OF all fioors lex
cept the top or upper floor and the
roof VIII be allowed.
For warehouses and factories,
seventy-hve C76) per cent. OF the
For stores and buildings for
light notwithstanding purposes.
For churches. school houses
and places OF public amusement.
seventy 7oD per cent. of the live
In ONCE buildings hotels.
dwellings. apartment houses
Tenement houses. lodging houses
and stables. sixty t6o) per cent
OF the live load.
Variation from the above re-
duirements may be had only on
special and written permission
from the department. OF buildings.
AND BEAMS. All wooden floor
ing between two CD joists or sup
ports or any floor arch OF brick.
tile or concrete. or any reinforced
or armored concrete, or other NIL
joists. beams or Orders, shall be
proportional to carry not less
than ten (10) per cent. more live
load. than assumed for such toists.
All beams. rafters. Joists or
girders, shall be proportioned to
carry all of the dead load in addi-
ton to the whole Of the imposed
Sec. 4 FLOOR LOAD PLA-
CARDS DISPLAYED. IL shall be
the duty OF every owner OF every
building OF class I. already con-
structed. or hereafter 10 be con
occupant OF the building. to pro-
vide, affix and display conspicu-
ously on each floor OF such build
ing. placard stating the load per
may with safety be applied TO that
particular floor, and II the
strength of the different part. OF
any floor varies, then there shall
S be such no placards .n for zach Zach
It shall be unlawful 70
part thereof, to greater
extent than the load indicated up
duty OF the occupants OF the
building to maintain such pla-
cards during their occupancy OF
the premises, and the owner OF
ess ou the same h e sep properly ssa
afixed with each change Of oc-
cupancy. These placards and com 2
putations shall be verified and APP
rGnr. By S.to sns tSsyg ars a.sS
upon the respective floors OF the
different buildings.
ARTICLE XII.
Structural Iron and steel Ccnstruc-
sTxNptRr1s. So See Article IN *.
Sections IL. IL and Is.
Ic ssG fRoPh nsnGns A See f Ar,isio
TX. Section Is
Sec. 3. FRAMING OF sTRUC-
TURES. See Article Y, Section 2
Sec. 4. FACTOR OF SAFETY.
See Article X. Section Q.
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 i5es