The Olneyville times. (Olneyville [Providence, R.I.]) 1887-1917, 1909-09-03

] or steel girders shall be covered similar "a
| columns with bT.ckwork not less than
| four inches i'm thic@ness. except that tho
| outer edge Of the fanges Of beams OF
plates or angles connected 20 the beam ms
may be within two inches Of the outside
Of brick casing II the inside surfaces of
girders project inside Of brckwork they
shall be covered with terra Gotta, con-
crete, or other fireproof material not less
than four inches thick
Girders fsr the support OF the inclosure
walls shall be placed at the floor line Of
each story. The sksleton steel or iron
frame OF a building shall be independent
from that OF an adjoining building. and
the frame OF one building shall not be
boltcd or rivetcd I'm any manner TO that
OF any other building.
REINFORCED CONCRETE CONsTRUC-
TION.
The term reinforced concrete" or con
crete steel I'm this act shall be taken 10
mean an approved concrete mixture rein
forced by steel Of any shape so combined
that the steel will take up the tensional
stresses and assist In the resistance TO
shear
Reinforced concrete construction may
be accepted for freproof buildings: Pro
Vided. that the aggregate shall be hard
burned broken bricks, or terra Gotta clean
furnace clinkcrs free Of combustible mat
ter clean broken stone or gravel or fur
mace Stag together with clean silCeOus
sand. If said sand Is required 10 produce
"A close and dense mixture; and provided.
further. that the minimum thickness OF
concrete surrounding any reinforcing mem
bers onc-qugatcr Of an inch or less IN
diameter shas be one inch; and for mem
bers larger than one-quarter inch, the
minimum thickness Of protecting concrete
shall be four times the diameter Of the
lii IH.t f.y ,ata In ha
event OF bars other than circular cross
section, which lies in the direction in
which the thickness Of the concrete is
measured: but no protecting concrete need
be more than four inches thick for bars
OF any size.
Exposed metal centering or exposed
metal Of any kind will not be considered
a factor in the strength af any part OF
any concrete structure, and plaster fin
ish applied over the metal shall not be
deemed sufficient protection.
Concrete steel may be used for columns
in which the ratio OF length 10 least side
or diameter does not exceed twelve.
The reinforcing rods must be tied to-
gether at intervals Of not more than the
least side or diameter OF the column.
The owner Of any reinforced concrete or
concrete steel construction building must
be prepared 70 make load tests. within
reasonable time after the erection OF the
whole or any part or parts OF such build
ing as often as may be required by the
inspector. The tests must show that the
will sustain a load with
factor Of safety as laid down for floors
and structural members by this act
The modulus Of elasticity Of the con-
crete. IL not shown by direct tests, may
for beams and slabs be taken as one
fifteenth that Of steel, and for columns
one-tenth that Of steel.
ELEVATOR STAIRWAY, AND OTHER
ENCLOSUR
Sec. "a All stairways hereafter placed
in any building more than two stories IN
height. or exceeding five thousand feet IN
area in the first district. or in any build.
ing more than four stories in height on
exceeding six thousand feet in area In the
second district, except dwellings and all
elevators hoistways. hatchwaYs, well |
holes. chutes. dumb walters, and interior
light or vent shafts or shafts of any de-
scripton. hereafter placed in any build
ing except fiTeproof (absolute) buildings,
and dumb walters IL dwellings not eN-
tending over three stories above the base
ment. shall be enclosed in suitable walls
of brick or with a suitable framework OF
iron and burnt-clay filling, or OF such
other firepToOf material or form or con !
struCtion as may be approved by the IN
spector. except that the enclosure walls, !
required by this section in any non-tire-
proof building, used as a warehouse, |
storehouse. store. workshop or factory
shall be OF brick. All such walls or con- !
structon, where the elevator. stairs, hoist,
hatchway chute, dumb waiter, light or |
vent shaft. or other shaft, extends to the !
top floor. shall extend through, and at
least three feet above, the ROOF. ana be !
covered with a roof of incomhustible ma /
terial. with a skylght or sidelights built !
10 nf
shaft roof at least three-quarters the /
area Of the enclosure or shaft, made of
glass set in metal frames as provided In f,
section % OF this act.
IL the enclosure walls are OF brick any |
Of the above shafts may be In the same !
enclosure provided the stairs are con- |
structed OF incombustible material. When |
the shafts do not extend to the ground /
the bottom floor OF the shaft shall be con
structed OF fireproof material.
All openings into any Of the above |
named enclosure walls shall be provided I
with hreproof doors or wire glass win |
iows set i'm metal frames. Lights OF wire
glass i'm metal frames may be placed in T,
such doors and in the enclosure walls, |
but no one pane shall exceed i'm area two /
hundred and fifty inches between mum.
tins. and no one pane OF wire glass in the ,
aforesaid windows shall be larger than /
twenty-four by thirty inches between /
muntins.
Automatic closing fireproof trap doors |
approved by the inspector may be sub /
stituted for the above named enclosure |
walls for hoistways (without cars), /
and chutes.
In all buildings hereafter erected in /
the first or second district that are less |
i'm height or area than hereinbefore men. !
toned in this section, the stairways shall |
be Of such number, and protected in such |
a manner. as may be approved by the in.
spector.
In existing buildings, passenger ele. |
vators. enclosed in open grill work, may |
be erected in staircase enclosure, where |
the entire space occupied by the stairs :
and elevator is enclosed in brick or other !
walls as hereinbefore mentioned that may q.
be approved by the inspector: Provided, |
that in warehouses, storehouses. stores, |
or factories, all openings in !
the enclosing walls must be provided |
with flreproof doors, windows. wire glass,
and metal frames as required elsewhere |
in this section for elevator and stairway |
BRICK. BLOCKS, LIN. |
Tells, ETC.