The Detroit times. [volume] (Detroit, Mich.) 1903-1920, 1910-10-05


pine 1850 100
Norway pine - $50 30
For wooden posts where the
length IL not more than twelve
j. strength Of the posts or strut may
be computed by the rule as fol-
lows:
Safe Load
Area OF cross section x &C.
Factor OF Safety.
The factor OF safety to be used
depends upon the place where the
y column or strut IL used. the load
which comes upon Ii, and the
K &palityof the material. In no case
.abRu there be used a factor OF
vifties herein given as &C. for
timber under Crushing Strength
In pounds per square inch.
s Where the length of posts ex-
ceeds twelve t12) times the least
thickness for yellow pine. and ten
Z following formulaes:
For yellow pine--Safe load per
per square fnch=-1 .000-10xLength
IN Inches, breadth in inches.
For oak and Norway pine--safe
iosa per sn square ineh77 ~ ,rcnss
For white pine and spruce--safe
load 1aper square inch=s25---6x
Z length In inches, breadth In inches.
For posts having bad knots. or
other defects, or which are known
% be scientifically loaded. a deduc-
f15) per cent should be made from
Sec. IL WIND PRESSURE. All
Structures exposed to the wind
shall be designed to resist hori-
! 1ontxl wind pressure OF thirty tsol
rrAm fnr fnnt nf
\ eprfnce exposed, from the ground
70 the. top, including the roof.
In all structures exposed to wind.
: II the resisting moments Of the
ordinary materials OF construction.
4 such az masonry. partitions, floors
\ and connections, are not sufficient
20 resist the moment OF distortion
Z due TO wind pressure taken In any
direction kEa: on any part Of the he's. ssrus e.
5, introduced sufficient to make up
the difference I'm the moments.
4 In calculations for wind bracing.
& the, working stresses may be In
I creassd by twenty-five t2sD per
7 cent. 500
Y ARTICLE xI. fss-s
Floor ans Roof Loeas. ~ =
|. sec i. MINIMUM LIVE LOADS
~ SsiRicient strength 10 hear safely
\ the weight to...be imposed. thereon
In addition 30 the 1ws1ght OF the ma
3 tertai ~ (which the sGoor ~ construct.
J. rhs live loads shall consist OF all
(. loads other than the dead loads.
The dad loads tn all buildings
& |. and stfuctures. shall consist OF the
actual weight Of walls. floors, roofs,
partitions and all permanent cor
etructioIl<l 11lzls. 5cg r4.1tss4G - ~
a Edcht door. shall: be constructed %
4 carry The following sminfsnufn five
loads In pounds per DQuare foot uni
formly distributed:s ss'rsssD fh~-~
Class I. store buildings. Light
FIRST fioor, rs pounds: all other
floors. 100 pounds: store buildings.
h<avy rnerchandise, IT'S pounds;
storage buildings. heavy smerchan-
elise. zoo pounds. manufacturing and
nght storage. 130 pounds large
Gar6ges and stables, so poundhtr
The floors of manufactnrins
buildings, carrying heavy or fast
IN strength over the above require
uents. Nrr rs@t,
Ofrice buildings, frst floor, ,igla5
3 pounds. all other floors. rs pounds
Class 2. Hotels. Tenements, board
}nf and Lodging Houses: sra
N. ffTxI uo0r. % pounds. lobbies,
s. halls. corridors. dining rooms and
other public rooms.f so pounds; pri-
. vate rooms. and apartments. so
z pounds: public buildings. first floor.
tIxo pounds; all other floors. 30
rounds
~ Class 3. b
N. Residences, SO pounds: small
: oeabloe and garages. so pounds
Clnse g. Assembly Halls. Church.
: q ana Church Houses: 10
With fixed seats, 50 pounds with
fm3cabIe seats. 100 pounds: floors for
: dahcinR. i25 pounds: sthirwaysc12s
( touhdss Hobbies and passaafsways.
q 100 potindA Wr
IN Schools.
Assembly halls. 100 pounds: class
[cDfns, as pounds: halls and corri-
Ic.4 20 pounds: stairways. Toe
~ other buildings In this class:
To< 6cor. 100 pounds: all other
- ~ pounds 81.
a Ln<n &. Theatres.
I<& 1xed seats. so pounds: with
ocnts. 100 pounds: stair
1II rounds. Hobbies and pas
MI 100 pounds. !,