(a) Allowable Loads
and Stresses for Beams and Floors.
(1) The
stresses shall not exceed 80 percent of those permitted for static loads.
(A) Structural steel by AISC Specification
for Design Fabrication and Erection of Structural Steel Building.
(B) Reinforced concrete by ANSI A89.1
Concrete Building Code Requirements for Reinforced
Concrete.
(2) The
stresses in overhead beams, floors, and their supports shall be based on not
less than the sum of the following loads:
(A)
The load resting on the beams and supports, which shall include the complete
weight of the machine, sheaves, controller, governor, and any other equipment,
together with that portion, if any, of the machine room floor supported
thereon.
(B) Twice the sum of the
tensions in all wire ropes passing over sheaves or drums supported by the beams
with rated load in the car.
NOTE: These tensions are doubled to take care of impact
accelerating stresses, etc.
(3) The stresses in beams, foundations, and
floors for machinery and sheaves not located directly over the hoistway shall
be based on not less than the following loads:
(A) The foundation shall support the total
weight of the machine, sheaves, and other equipment, and the floor, if
any.
(B) The sheave beams and the
foundation bolts shall withstand twice the vertical component of the tensions
in all hoisting ropes passing over sheaves or drums on the foundation or beams,
less the weight of the machine or sheaves.
(C) The sheave beams and the foundation bolts
shall withstand twice the horizontal component, if any, of the tensions in all
hoisting ropes passing over sheaves or drums on the foundation or
beams.
(D) The foundation shall
withstand twice the turning moment, if any, developed by the tensions in all
the hoisting ropes passing over sheaves or drums on the foundation or
beams.
(4) Where stresses
due to loads, other than elevator loads, supported on beams or floor exceed
those due to elevator loads, 100 percent of the permitted stresses may be
used.
(b) Allowable
Deflections. The allowable deflections of machinery and sheave beams, and their
immediate supports under static load, shall not exceed
1/1666 of
the span.
(c) Bolts and Rivets.
(1) Anchor bolts for machines or sheaves
located below or to one side of the hoistway shall conform to ASTM A307.
(A) Total tension in anchor bolts shall not
exceed 12,000 pounds per square inch of net section.
(B) Total shear in anchor bolts shall not
exceed 8,600 pounds per square inch of actual area in the shear plane.
EXCEPTION: Bolts made of steel having greater strength
than specified by ASTM A307 may be used and the maximum allowable stresses
increased proportionately based on the ratio of ultimate strengths. Elongation
shall conform to the requirements of the corresponding ASTM
specification.
(2)
Bolts or rivets used to secure overhead hoisting rope hitch plates shall
conform to ASTM A307 and ASTM A502 respectively.
(A) Where bolts or rivets are subjected to
shearing stresses due to tension in the hoisting ropes, the total shear shall
not be more than 8,600 pounds per square inch of actual area in the shear
plane. The stresses in welds shall not be more than 8,000 pounds per square
inch based on the throat area of the welds.
EXCEPTION: Bolts made of steel having greater strength
than specified by ASTM A307 may be used and the maximum allowable stresses
increased proportionately based on the ratio of ultimate strengths. Elongation
shall conform to the requirements of the corresponding ASTM
specification.
(3)
The fastenings used to attach equipment, except rail brackets, to the
supporting structure shall be designed to withstand seismic forces of 1.0 g.
horizontally and 0.5 g. vertically acting simultaneously when such fastenings
are rigid or when fastenings use rubber or similar material for vibration
isolation of equipment. Fastenings using springs for vibration isolation of
equipment shall be designed to withstand forces double those for rigid
fastenings.
The stresses in parts or structural members made of
steel shall not exceed 88% of the yield strength of the material used in the
fastenings.
(d)
Hitch Plates and Hitch Plate Supports. Total stresses in tension, plus bending
in hitch plates and in hitch plate shapes, shall not be more than 12,000 pounds
per square inch. The hitch plate supporting beams shall be designed to
withstand twice the sum of the tensions in all the hoisting ropes attached to
the hitch plates.
(e) Cast Metals
in Tension or Bending. Cast metals having an elongation of less than 20 percent
in a length of 2 inches, which are subject to tension or bending, shall not be
used to support machinery or equipment from the underside of overhead beams or
floors.
Notes
Cal. Code Regs. Tit. 8, §
3111
1. New
subsection (c)(3) filed 9-5-75; effective thirtieth day thereafter (Register
75, No. 36).
2. Amendment of subsection (a)(1) filed 6-23-77;
effective thirtieth day thereafter (Register 77, No. 26).
3.
Subsection (c)(3) which was filed 9-5-75 (Register 75, No. 36), was approved by
the Building Standards Commission 3-26-76. History note printed in Register 78,
No. 30 for technical reasons.
4. Editorial corrections (Register 95,
No. 34).