Every evening, Wilmington daily commercial., 1906-01-25

,,.iorn skvscrapers are specifically
ILL for in the new building ordi-
NV ~ now pending before City Council.
I,on and steel construction has been
n.ahllv studied by Building Inspector
Sc.rnely. who drafted the ordinance, and
=. Sas made full provision for it.
~ material can be used in any
Chi iron or steel column of less
',..rSess than one thirty-second of its
Nl'rrnorted width measured between
.-r,re. of rivets transversely, or one
's.,.ortl the distance between centres Of
siret. In the direction of the stress.
The ends of all columns must be faced
90 rlane surface at right angles 10 the
s,i. of the columns and the connection
s.tveen them shall be made with splice
s,ots. near the floor line. The joint may
L Elected bv rivets of sufficient size and
number. and the splice plates shall be Of
spafcienf sectional area 10 make up the
forzontal shear for wind or any eccen-
tric stresses of column splcod. When
me- section of the columns TO be spliced
4. such that the spliceplates cannot bee
nsed. a connection formed Of plates and
ANGLES may be used designed to properly
distribute the stress.
Steel and wrought IRON columns must
he made in one, two or three-st0ry
lengths. and the materials must be rolled
IN one length wherever practicable TO
avoid intermediate splices. Where any
mart of the section Of a column projects
beyond that of the column below, the dif
ference must be made up by filling plates
secured 10 the column by the proper num-
ber Of rivets. Shoes of iron or steel, as
described for cast iron columns, or built
shoes Of plates and shapes, may be used,
complying. with the same requirements.
Ail cast iron columns must be of good
Workmanship and material.
In addition to the requirements, wher-
ever the core of a cast iron column has
shifted more than one-fourth the thick
ness Of the SHE'LL the strength must be
computed assuming the thickness Of
metal all around equal TO the thinnest
rart and the column must be condemned
II the computation shows the strength
to be less than required by these regula-
tons Wherever blowholes OF imperfec-
tons are found in a cast iron column
which reduces the area of the cross sec
ton at that point more than ten per
cent. such column win be condemned. The
Top and bottom flanges, seats and lues
must be of ample strength, re-enforced
by fllets and brackets. They can not be
less than one inch in thickness when fin
ishei
An columns must be faced at the ends
% a true surface perpendicular to the
axis Of the column. Column joints must
be secured by not less than four bolts,
each not less than three-quarters of an
inch in diameter. The holes for these
bolts must be drilled to a template. The
core of a column below a joint can not be
larger than the core of the column above,
and the metal shall be tapered down for
distance of not less than six inches OF a
joint plate may be inserted of sufficient
strength 20 distribute the load
Iron or steel shoes or plates must be
used under the bottom tier Of columns to
properly distribute the load on tho
foundation. Shoes shall be placed on top.
top.
Cast iron posts or columns not cast
with one open side OF back, before being
Get up in place shall have a three -eighths
VI au lNlu uolt ulllltQ III lue smart OF
each post or column or any other similar
size hole OF holes which the inspector
may require 10 exhibit the thickness OF
The castings, must be drilled in the posts
OF columns by the manufacturer or con.
tractor furnishing the same at his OWL
expense
Iron or steel posts or columns with one
OF more open sides and backs must have
tohd iron plates ON top of each, except.
ing where pierced for the passage OF
pipes.
hvets in iron or steel ianges must bC
spaced So that the least value of a rivet
lor either shear or bearing is equal TO ol
greater than the increment or strain due
70 the distance between adjoining rivets
All other rules given under riveting shall
be followed. The length Of rivets be
tween heads shall be limited to foui
tunes the diameter The compression
uange OF beams or plate girders shall bl
secured against buckling if its length
exceeds thirty times its width If splice.