The Detroit times. [volume] (Detroit, Mich.) 1903-1920, 1911-02-20

In calculations for wind bracing.
the working stresses may be In
creased by twenty-five l2D per
cent.
Section Is. Should new methods
or construction be desired such as
are not now embodied In this or
dinance. such new methods shall
be submitted TO the Department Of
Buildings with full plans. specif-
cations and calculations. and III
these are approved by the Depart
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
i n ahs on,ni or OF he p1p ssnmasrn,.nt
n factor OF safety OF. at least. four
CD shall be developed, the con-
struetion proposed may be APP
ARTICLE H.
Floor and Roof Loads.
Sec. I. MINIMUM LIVE LOADS
REQUIRED. Every floor shall be
OF sufficient strength to bear safely
the weight TO be imposed thereon
In addition TO the weight OF the ma
teriai 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
and structures. shall consist 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 In pounds per square foot uni
formly distributed:
Glass !. store Buildings. Light
Merchandise:
First floor. las pounds: all other
floors. 100 pounds; store buildings,
heavy merchandise, ITS pounds:
storage buildings. heavy merchan-
disc, 200 pounds; manufacturing and
garages and stables 50 pounds
buildings. carrying heavy or fast
running machinery. shall be increased
In strength over the above require
Office buildings. first moor, 125
pounds: all other floors, rs pounds
Class 2. Hotels. Tenements, Board
ing and Lodging Houses:
First moor. 80 pounds; Hobbies:
other public rooms. 50 pounds: pri-
vate rooms and apartments so
pounds: public buildings, first moor,
i2s pounds; all other floors, 90
pounds.
Class 3.
stables and garages, so pounds.
Glass 4. Assembly Halls. Church.
es and Church Houses:
With fixed seats, so pounds with
movable seats. 100 pounds: floors for
pounds; Hobbies and pasmSeways
100 pounds.
Schools:
Assembly halls. 100 pounds; class
rooms. IS pounds: halls and corri-
doris. 80 pounds; stairways. 100
pounds
All other buildings In this class:
First floor. 100 pounds; all other
floors. 80 pounds.
Class s. Theatres:
With fixed seats, so pounds; with
movable seats. 100 pounds; stair
sageways, loo pounds
Attics when not used for habita-
ton. 20 pounds: roofs. 40 pounds:
sidewalks. $50 pounds.
Sec. q 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
OF the live load OF all floors Eek
cept the top or upper floor and the
For warehouses and factories.
live load.
For stores and buildings for
seventy (7o) per cent. of the live
load.
For churches, school houses
and places or public amusement.
seventy 0o) per cent. Of the live
In once buildings. hotels.
dwellings, apartment houses
Tenement houses. lodging houses
and stables. sixty tso) per cent
Variation from the above re-
quirements may be had only on
special and written permission
from the department. Of building:
AND BEAMS. Ali wooden foor-
ing between two ca 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 girders. shall be
proportioned to carry not less
than ten G0) per cent. more live
load. than assumed for such toists,
All beams. rafters, toists or
girders.. shall be proportioned to
carry all OF the dead load in add
ton to the whole of the imposed
uniformity distribstsd live iosd.
CARDS DISPLAYED. 1t shall be
the duty OF every owner OF every
structed. or hereafter to be CON
s sur, or Of his agent or Of the
vide. afix and display conspieu-
ously on each floor Of such build
ing. a placard stating the load per
square foot of floor space which
pa ay %sn safety oor be a sna 70 's s
strength Of the different parts of
any hoor varies. then there shall
be such placards for each
ftsryin .s.n part B. Of un iaSa no0 To-
load any such floors or any
sItent than the load indicated up
on such placards. 1t shall be the
S SnEdn Gf tn the ms eSes2ant 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 placards and COM
putations shall be verified and APP
proved by the department Of
buildings before they are afixed
upon the respective floors OF the
ARTICLE XII.
Structural Iron .nd steel CONSTITUTE
Sec. 1. IRON AND STEEL
STANDARDS. See Article TX,
Sections Is. IL and Is.
Sec 2. PHYSICAL AND CHEM
ICAL PROPERTIES. See Article
Sec. 8. FRAMING OF sTRUC-
TURES. See Article X. Section Q
Sec. 4. FACTOR OF SAFETY.
See Article X, Section ..
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 45ss
of it's yield point and never sx-