(a) The minimum fiber stress for beams and girders shall be 1,200 pounds. The modulus of elasticity shall be 1,700,000.
(b) Girders may be solid wood, built-up wood or structural steel.
(c) All joints of solid or built-up wood girder shall be made over piers or columns.
(d) Steel posts shall be of an approved type firmly bedded in concrete and have a flanged top firmly fastened to the underside of the girder. The width shall be equal to the width of the girder. Where an adjustor is used, the adjusting device should be immobilized.
(e) Maximum clear spans between supports under wood beams or girders in dwellings shall not exceed the following size:
SIZE OF FIRST FLOOR BEAMS FOR ONE-STORY DWELLINGS TO CARRY FIRST FLOOR, CEILING AND PARTITIONS | |||||
SPAN OF BEAM | SPAN OF JOISTS | ||||
12 Ft. | 13 Ft. | 14 Ft. | 15 Ft. | 16 Ft. | |
8 Ft. | 6x8" | 8x8" 6x10" | 8x8" 6x10" | 8x8" 6x10" | 8x8" 6x10" |
9 Ft. | 8x8" 6x10" | 6x10" | 6x10" | 6x10" | 6x10" |
10 Ft. | 8x10" | 8x10" | 8x10" | 10x10" | 10x10" |
11 Ft. | 8x10" 6x12" | 8x12" | 8x12" | 8x12" | 8x12" |
12 Ft. | 8x12" | 6x14" | 6x14" | 6x14" | 12x12" |
(f) If the total of the spans of joists framing into the girder on both sides exceeds thirty- two feet, or if loads are concentrated, the size and span of the girder shall be determined by established engineering practice.
Steel beams and girders and their spans shall be determined by established engineering practice.
(g) Ends of wood girders entering masonry or concrete walls shall be provided with a one-half inch air space on the top, sides and end, unless an approved wood of natural decay resistance or a moisture-treated wood is used.
(h) Built-up or laminated beams shall be bolted, spiked or fastened together and splices shall be made in a manner so that the unit stresses of such beam shall not be exceeded.
SIZE OF FIRST FLOOR BEAMS FOR TWO-STORY DWELLINGS TO CARRY FIRST FLOOR, SECOND FLOOR AND PARTITIONS SIZE OF BEAM | |||||
SPAN OF BEAM | SPAN OF JOISTS | ||||
12 Ft. | 13 Ft. | 14 Ft. | 15 Ft. | 16 Ft. | |
8 Ft. | 6x10" | 8x10" 6x12" | 8x10" 6x12" | 8x10" 6x12" | 8x10" 6x12" |
9 Ft. | 8x10" 6x12" | 8x10" 6x12" | 8x12" | 10x10" | 10x10" |
10 Ft. | 8x12" 6x14" | 6x14" | 6x14" | 6x14" | 10x12" 8x14" |
11 Ft. | 8x12" 6x14" | 6x14" | 8x14" | 8x14" | 8x14" |
12 Ft. | 10x12" 8x14" | 10x14" | 10x14" | 10x14" | 12x14" |
(Ord. 42-1981. Passed 2-23-81.)