The Saint Paul globe. (St. Paul, Minn.) 1896-1905, 1901-08-30
PART v.
CALCULATION, STRENGTH OF MA
TERIALS.
See. 81. Safe Loads for Masonry
Work


See. 81. Safe Loads for Masonry
Work
The safe bearing load to apply to brick
work shall be taken at eight tons per
square foot when lime mortar is USED;
! eleven and one-half tons per square foot
when lime and cement mortar mixed is
used; fifteen tons per square foot when
| cement mortar is used. The safe bearing
load to apply to rubble stone work shall
be taken at twelve tons per square foot
| when Portland cement is used. When &C.
| ment other than Portland is used, nine
tons per square foot; when lime and &C.
ment mortar mixed is used eight tons
| per square foot; and when lime mortar
is used six tons per square foot The
| word ton" wherever used in this orol-
nance, shall be construed to mean ton
| Of 1000 pounds.
The safe bearing load to apply to con-
| crete when Portland cement is used Shall
| be taken at fifteen tons per square foot;
when cement other than Portland is
| used, eight tons per foot.
Sec. 81. Computation for Strength
of Materials
The dimensions of each piece or COM
| bination of materials required shall be
ascertained by computation according
| to the rules prescribed by this Code.
Sec. 33. Factors of Safety
Where the unit stress for any mate
| rial is not prescribed in this Code, the
| relation of allowable unit stress to ulti-
mate strength shall be as one to four for
! metals subjected to tension or trans
! verse stress; as one to six for timber,
| and as one to ten for natural or artlhc1a1
! stones and brick or stone masonry. But
wherever working stresses are prescribed
| in this Code, varying the factors of safe
| ty herein above given, the said working
| stresses shall be used.
! See. "a. Tests for Materials
New structural materials of whatever
| nature shall be subjected to such tests
| to determine it's character and quality as
| the Commissioner of Public Works shall
| direct; the test shall be made under the
! supervision of said Commissioner or the
| Architect or Owner may file with him
! a certified copy of the results of tests,
! such as he may have prescribed, which
| have been made.
| Sec. 35. Strength of Columns
The working stresses used for the cal
| culation Of cast iron, steel, wrought iron
! or wood columns shall be determined by
! the use Of Ranlkin's formula.
Any column scientifically loaded shall
! have the stresses caused by such eccen-
tricity computed, and the combined
! stresses resulting from such eccentric
| ity at any part of the column, added
! to all the other stresses at that part,
! shall in no case exceed the working
stresses as computed by Ranl1in's for
! mula.
The eccentric load of a column shall be
considered to be distributed equally over
! the entire area of that column at the
| next point below at which the column
| is securely braced laterally in the direc-
! ton of the eccentricity.
! Sec. SO. Working Stresses
The safe carrying capacity of the va
! riouS materials of construction Except
| in case of column) shall be determined by
substantially the following working
| sectional area:
COMPRESSION OIRECD.
Rolled steel .16, coo
! Wrought iron ..........................1 2, coo
| Cast iron On Short blocks) ............ l6, 900
| Steel pins and rivets (bearing) go. Is, 900
! Wrought iron pins and rivets Gear
1PS) .......... ..r...... Ia, 900
With Across
Grain. Grain.
Yellow pine, Washington and
oregon nr ...............,....1,10 100 600
! Nhlte pine ..................... 800 300
| Spruce -. Observation-Disclosures. 800 400
Locust .'.....................l,2 40 LOCO
6Eiemlock .''..'.'..'.. '......... goo goo
! Chestnut ............ .......... 500 1000
Concrete PORTLAND cement, l. sand
|
! Concrete Portland) cement, l. sand
! 2; stone OBSERVATION-DISCLOSURES. 20S
| Concrete (Rosendale or equaD ce-
ment, /; sand, 2; stone 4. 125
| Concrete (ROsendale or equaD ce-
| 'ment, /; sand, 2; stone 5........... III
Bubble stone work in Portland ce-
ment mortar .......................... 14O
Bubble stone work in Rosendale ce-
ment mortar Observation-Disclosures. Ill
| Bubble stone work in lime and ce-
ment mortar Observation-Disclosures. 81
Bubble stone work in lime mortar 70
Brick work in Portland cement NOR
tar cement, 1; sand, 3.............. 25O
Brick work in Rosendale or equal
cement mortar, cement, l; sand, 3. 2G8
/ Brick work in lime and cement NOR
/ tar, cement, /; lime, 1, sand, 3d. $50
! Brick work in lime mortar, lime, 1;
Sand, 49,. .......... ................ III
/ GRANTEES according to test L 900 to 3. 600
Ilmestones according to test 100 to 2, 800
| Marbles according to test 800 to /, 200
Sandstones according to test) 400 to 1 800
Brick Cfatwise) $50 to 300
TENSION OIRECT).
Rolled steel Observation-Disclosures. .16 COO
Wrought iron Observation-Disclosures. 12, 900
Cast iron .......................... 5000
Yellow pine. Washington and Ore
| son mr. ............................ ], 200
White pine ................... .......... 500
| spruce ...... ACKNOWLEDGEMENTS. 500
YAK ,.-;r' 1900. OBSERVATION-DISCLOSURES. 1000
hSAuloCk '....... ACKNOWLEDGEMENTS. 6O0
SHEAR
Stee! plateS OBSERVATION-DISCLOSURES. 5000
| Steel shop rivets and pins ......... 10, 900
| Steel field rivets ACKNOWLEDGEMENTS 600
! Steel field bolts ....-...................7 900
Wrought iron web plates ............ 5000
/ Wrought iron shop rivets and pins 1900
Wrought iron field rivets .......... 5000
wrought iron field bolts ........... $500
| Cast iron Observation-Disclosures. 5000
With Across
Fiber. Fiber.
Yellow pine ................ 70 500
| spruce -. ACKNOWLEDGEMENTS. 90 800
| Oak '..s......................s 600
/ LOCUST .-.'..'-. s'...L........... 100 720
! Hemlock ...... .s........,...... 40 275
| chestnut ACKNOWLEDGEMENTS. :. 150
SAFE EXTREME FIBER STRESS
(BENDING).
Rolled steel beams 0oo
| Rolled steel pins, rivets and bolts. 20, 600
Rolled steel beams net fange sec
LIN ........, '>S .. H. 900
Rolled wrought iron pins, rivets and
Rolled wrought iron beams (net
tiange sectioD ...:................... u, 600
! Cast iron, compression side ..16, 600
| Cast iron tension side .. 3 000
yellow. pine Washington and Ore
! Son III '.-..'.....:. ....................1,500
w AIle pine ], 900
spruce 49,. ..''........ ..........s....... 900
OdA .:.....'.'...'ss..'.. ......,.......... 600
LOCUST ..''.... ........................,.1 ], 200
6en!ock ..'.'.'...s ...................... 600
| Granite