Evening bulletin. [volume] (Honolulu [Oahu, Hawaii]) 1895-1912, 1911-06-08

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Steel in compression ........i0,0OO
Steel In shear ..............10,O0
Concrete in direct compress
SION ......... ............ 5OO
Concrete extreme fibre in COM
preston ......... ......... 700
Concrete in shear ........ so
REINFORCED CONCRETE ASSUME
TIONs.
Section 4G. All reinforced concrete
work shall be designed in accord
ance with best standard engineering
practice. The following assumptions
may be made:
When beams and Orders are made
monolithic with the floor slab, they
may be computed as ct" beams. The
width of slab which may be consider
ed part of the beam will depend upon
the shearing stresses, but in no case
shall such total width exceed three
times the width of the beam
REINFORCED CONCRETE coll
UMNS.
Section AZ. The column rods shall
be tied together by steel hoops spac-
ed not more than twelve Ci2) Inches
apart.
When the unsupported length of a
concrete column exceeds twelve Q2I
| times Its least side or diameter the
allowable compression of the concrete
shall be taken as Ave hundred (5OO)
pounds multiplied by the least side
or diameter OF the column In inches
and divided by the unsupported length
In feet.
For exterior columns subject to &C.
centric loading or bending of an In
! determinate amoum, the above stress
shall he reduced at least twenty (2O)
per cent. When the bending stresses
| In column can be definitely determ-
ined, the combined bending and direct
stresses shall not exceed FIVE hun
dred 5000 pounds per square inch.
In buildings over four (i) stories
high sufficient steel reinforcement
shall be used to carry at least seven
ty-fye $50 per cent of the dead load
OF the floors and roof. figuring ten
thousand 100000 pounds per square
inch on the steel. except when in
buildings of any number OF stories the
columns are large enough 80 that the
concrete alone will carry the total
live and dead loads with stress OF
not over five hundred 5000 pounds
per square inch the amount of steel
reinforcement may be reduced to not
less than one % per cent of the
cross section area OF the column.
Proper provision shall be made for
transmitting the stresses at the
spices in the column rods
In buildings over four az stories
high all spices in the reinforcing
steel below the upper three floors
shall he made by means of rlveted
connections, sleeve nuts, turnbuckles.
| or some approved positive connection.
COLUMNS FILLED WITH CON
CRETE.
Section As. Columns composed OF
!, structural steel shape, lattlced togeth-
err by riveting and filed In solidly
and surrounded by concrete, may be
computed as reinforced concrete col
umns except that the allowable stress
in the steel may be increased to twelve
thousand 12.OOO pounds per square
inch
CONCRETE COLUMN PROTECTION
Sectioy 40. The outer shell OF
concrete filed steel column shall be
considered only as a fireproof cover
ing.
PROTECTION OF STEEL.
| Section so. For the purpose of fire
protection the reinforcing steel shall
be kept away from the surface of the
concrete one and one-halt (1h) inches
In columns, one inch in beams and
Orders, and Y inch in slabs.
STEEL IN CONCRETE.
Section 81. All reinforcing steel
ishall be subject to test by an approx