OFFICIAL GAZETTE

concrete construction for structural strength
exceeds 15 times the least diameter of the
member, it shall not be calculated by the
formula in paragraph 1.
(Section of Member for Bending)
Article 103. Bending moment in number for bending
shall not exceed the value obtained by calculation
under the following formula :
M=f&S
where M-Bending moment#
f& =Allowable bending stress in the provision
of Article 98
S =Section modulus
(Section with Compression and Bending acted in
Combination at the Same Time)
Article 104. Combined unit stress resulting from
compression stress and bending moment occurring
at same time shall be calculated under the following
formula :
fc = (M/S) + (P/A) (l/(l-Cl/r))
where fc =Combined unit compressive stress
M=Bending moment
S =Section modulus
P =Compression force
A =Section area
1 =Distance between principal supports
r =Radius of gyration about neutral axis
of section due to bending moment.
However, the lumber the diameter of
section in bending moment, perpendicular
to neutral axis
C =0.003 for steel (0.004 in case its support
is hinged), for cast iron 0.005,
for lumber 0.02
2 Combined stress for preceding paragraph shall
not exceed the allowable unit stress as prescribed
in the provision of Article 98.
(Rectangular or T-beam Section)
Article 105. Bending moment in reinforced concrete
rectangular beam with single reinforcement,
or single reinforced T-beam with its
neutral axis located within the slab shall not
exceed the values obtained by calculation under
the following formulas :
M=ni(3 - m) fcbd2/6
M=(3-m) ffbd2/3m
where M=Bending moment
ni=Neutral axis ratio
fc =Allowable unit compressive stress in
concrete in the provision of Article 98
ft =2Allowable unit tensile stress of steel
bar in the provision of Article 98
m=Percentage of steel to concrete in
sectional area
b =Width of beam
d =Depth of beam
2 Ratio of neutral axis in the provisions of preceding
paragraph shall be calculated under the
-25-
following formula :
15
ni= (Vl+2m/15-l)
where ni=Ratio of neutral axis
m=Percentage of steel to concrete in
sectional area
(Reinforced Concrete Construction Member with
Shearing Stress)
Article 106. In section with main reinforcement
bars crossing, of reinforced concrete column,
beam or roof slab or floor slab, unit stress in
shearing figured by the following formula shall
not exceed 1/2 of compressive strength of
concrete at age of 28 days, and at the same
time, it shall be less than 18 kg. per sq. cm.:
f, = S/bj
where fs=Unit shearing for concrete
S=Shearing force
b=Width of beam or slab; however, for
T-beam the width of stem
j =Distance from center of compressive
stress to center of tensile stress
2 In case unit stress in shearing mentioned in
the preceding paragraph exceeds the allowable
unit shearing given in the provision of Article 98
paragraph 2, stirrups or hoopings shall be placed
in that part in accordance with the provisions of
the following items. However, where main bars
are bent up, that part may be considered as
provided with sMrrups or hoops :
(1) Stirrups and hoopings shall be arranged
properly to take care of shearing stress distribution,
and the spacing shall be less than 2/3
of depth of column, beam or roof slab or floor
slab;
(2) Stirrups shall go around outside of tension
bars and shall be carried into near the edge of
compression side and also, they shall be
anchored appropriately.
CHAPTER IV Fireproof Construction, Fireresisting
Construction, Firezone,
etc.
(Fireproof Construction)
Article 107. By fireproof constructions prescribed
in the provisions Article 2 item (7) of the law
means as described by the following terms, excluding
those that the grounds for finishing or
covering part of steel skeleton with metal lath
concrete, metal lath mortar, concrete mortar or
plaster given in (c) of items (1) to (4) inclusive
are those columns and beams given in item (2)
(a) or (b) with least diameter or width less than
25 cm. However, covering or thickness mentioned
in item (1) (c) or item (2) (c) includes
respectively the thickness of finish such as
mortar plaster and the like.
(1) Pertaining to walls that come under one of
the following items :