Ord 245-38 Ordtnanc
Book
AN ORDINANCE OF THE CITY OF DELRAY BEACH, FLORIDA,
PROVIDING FOR THE TYPE OF FOOTI}~GS AND FOUNDATIONS
WHICH SHALL BE USED IN THE CONSTRUCTION OF ANY
BUILDING OR BUILDINGS HEREAFTER ERECTED IN THE CITY
OF DELRAY BEACH, FLORIDA.
WHEREAS an emergency exists in the City of Delray Beach,
Florida, and it is necessary for the preservation of the safety
of the citizens of said City that the type of footings end
foundations used in the construction of buildings be regulated
by the City Council,
NOW, THEREFORE, BE IT ORDAINED by the City Council of the
City of Delray Beach, Florida:
J'~SECTION_~._ In the construction of any building or buildings
hereafter erected in the City of Delray Beach, Florida, all
footings and foundations shall be constructed of masonry or
reinforced concrete. Footings shall be so designed that the
allowable bearing capacity of the soil, as given below, shall
uot be exceeded.
Natural earth shall not be loaded to exceed the following
values given in tons per square foot.
Rock . . _ . . . 8, tons
Gravel ~r'o~a~s~ Sand' ~eil'c~m~n%e~ . . 3 tons
Dry hard clay or coarse firm sand . . . 2~ tons
Ordinary clay or sand. ........ ih tons
Soft clay, sandyloam or silt ...... 1 ton
SECTI. ON ~.., For buildings more than three stories in height,
test t~ingS shall be made at the expense of the owner to
determine the nature of the soil.
Where solid natural surface ground does not occur at the'
building site the foundation shall be extended down to natural
solid ground or piles shall be used, unless there is a practA-
cally level fill of good earth which has been in place a suf-
ficient length of time to settle properly. When such filled
ground is used for buildings, tests may be required by the
Building Inspector to show the proper sustaining power of such
fill.
SECT~0N ~,~ Wooden piles used to support the foundation of
a building or structure shall be of any suitable wood and not
less than twelve (12) inches in diameter at the top. All wood
piles shall be driven to a reasonably firm bearing and the tops
cut off level two (2) feet below water level unless used as
specified below.
If wooden capping timbers are used on top of piles, the
top of the capping timbers shall be at least two (2) feet below
water level.
The center of gravity of a piling cluster shall coincide as
nearly as possible with the center of gravity of load sustained.
Wooden piles may be used without any limits as to height
of cut-off, provided they shall not be considered as carrying a
load but only as compressing the soil or provided they are used
for frame buildings or are capped with a continuous concrete
footing.
The safe load of piles shall not exceed the values given
in the following formulae:
For piles driven by drop hs~mer:
T = 2VtH
s
For piles driven by steam hammer:
T = 2WH
s
Where T equals the safe load in tons; W equals the weight
of the hemmer in tons; H equals the height of fall or stroke of
hammer in feet; S equals the penetration in inches under the
last blow, or the average under the last five (§) blows. No
wooden pile shall be loaded more than fifteen (l§) tons.
SECTION 4. The maximum load on concrete piles cast in
place considered over the gross area shall not exceed twenty-
five one hundredths (0.~5) of tile ultimate compressive strength
of the concrete and for driven precase piles the safe load shall
be determined from the foregoing formula for wooden piles.
(Precast piles shall be provtded wtth not less than one
(1~ per cent nor more than five (§) per cent of longitudinal
reinforcement),
All concrete used in piles shall show an ultimate compressive
strength of not less than two thousand pounds (2000 lbs.) per
square inch at twenty-eight (28) days.
The safe load for concrete piles cast in place shall be
determined by test if so ordered by the Building Inspector.
~E~TION ..... . Tests shall be made on at least two (2) piles
on different locations. The test piles shall be loaded to twice
the designed load. The settlement shall be measured until the
last twenty-four (24) hour period shows no appreciable settlement.
The total Settlement in inches shall not exceed one one-hundredth
(1/100) times the test loads in tons, where the foundation
carried a structure continuous over two or more spans, nor twice
the amount where the foundation carried non-continuous spans.
The Building Inspector may if he deems it necessary, order similar
tests of wooden piles or precast concrete piles,
SECTION~~. At his discretion, the Building Inspector may
require from an owner or contractor a certificate by a civil
engineer registered with the State of Florida, showing the
permissible safe bearing aapacity of the soil on any proposed
building site.
SECTION 7 All ordinance~ in conflict herewith are hereby
repealed.
SECT~0~ .8~ This is an emergency ordinance and shall take
effect immediately upon ~ts passage.
PASSED on first reading on September 26, 1938.
PASSED on second reading on October ~D, 1938.
residen - ity CoUnci~
Attest: Approved:
City Clerk '' Mayor