Section 2.15 Car Frames and Platforms
This protection shall be provided by either of the following:
(a) a guiding means wherein no failure or wear of the guiding member shall allow the car to be displaced more than 13 mm (0.5 in.) from its normal running position
(b) a retention means that shall be permitted to be integral with the guiding means
(a) Rolled and Formed Steel. ASTM A36 or ASTM A283 Grade D or CAN/CSA-G40.21.
(b) Forged Steel. ASTM A668 Class B.
(c) Cast Steel. ASTM A27 Grade 60/30.
(a) ASTM A502
(b) ASTM A307
Rivets, bolts, and rods made of steel having greater strength than specified by ASTM A307 and ASTM A502 shall be permitted to be used, and the maximum allowable stresses increased proportionally, based on the ratio of the ultimate strengths. Elongation shall conform to the requirements of the corresponding ASTM specifications.
Metals other than steel shall be permitted to be used in the construction of car frames and platforms, provided the metal used has the essential properties to meet all the requirements for the purpose in accordance with sound engineering practice and the stresses and deflections conform to 2.15.10 and 2.15.11, respectively.
(a) ASTM D245
(b) ASTM D198
(c) ANSI Voluntary Product Standard PS 1-74 or CSA 0151
All platform materials exposed to the hoistway shall be either of the following:
(b) other materials that, in their end-use configuration, conform to the following requirements, based on the tests conducted in accordance with the requirements of ASTM E84, UL 723, NFPA 255, or CAN/ULC-S102.2, whichever is applicable (see Part 9):
(1) flame spread rating of 0 to 75
(2) smoke development classification of 0 to 450
The entrance side of the platform of passenger and freight elevators shall be provided with smooth metal guard plates of not less than 1.5 mm (0.059 in.) thick steel, or material of equivalent strength and stiffness, adequately reinforced and braced to the car platform and conforming to 22.214.171.124 through 126.96.36.199.
(b) where the elevator is not required to conform to 188.8.131.52(b), the depth of the leveling zone or truck zone, where provided, plus 75 mm (3 in.), but in no case less than 525 mm (21 in.) from the floor surface
Where the car entrance on the truck loading side is provided with a collapsible-type gate and the height of the hoistway door opening is greater than the distance from the car floor to the car top, a head guard extending the full width of the door opening shall be provided on the car to close the space between the car top and the soffit of the hoistway-door opening when the car platform is level with the floor at the truck loading landing entrance.
(b) Leveling/releveling shall be initiated before vertical exposure of the groove is revealed.
(c) Where exposure to the gap is revealed, the car shall not relevel with open doors.
(d) Edges forming the gap shall be configured to prevent hazards.
(b) for steels of greater or lesser strength, as permitted by 184.108.40.206.3, the allowable stresses listed in Table 220.127.116.11 are to be adjusted proportionally, based on the ratio of the ultimate strengths
(c) for metals other than steel, as permitted by 18.104.22.168, the allowable stresses listed in Table 22.214.171.124 are to be adjusted proportionally, based on the ratio of the ultimate strengths
|Member Type||Stress Type||Maximum Stress, MPa (psi)||Area Basis|
|Car crosshead||Bending||95 (14,000)||Gross section|
|Car frame plank (normal loading)||Bending||95 (14,000)||Gross section|
|Car frame plank (buffer reaction)||Bending||190 (27,500)||Gross section|
|Car frame uprights (stiles)||Bending plus tension||115 (17,000)||Gross section|
|140 (20,000)||Net section|
|Hoisting rope hitch plate and shapes||Bending plus tension||75 (11,000)||Net section|
|Platform framing||Bending||95 (14,000)||Gross section|
|Platform stringers||Bending||115 (17,000)||Gross section|
|Threaded brace rods and other tension members except bolts||Tension||60 (9,000)||Net section|
|Bolts||Tension||55 (8,000)||Net section|
|Bolts in clearance holes||Shear||55 (8,000)||Actual area in shear plane|
|Bearing||120 (17,500)||Gross section|
|Rivets or tight body-fit bolts||Shear||75 (11,000)||Actual area in shear plane|
|Bearing||140 (20,000)||Gross section|
|Any framing member normal loading||Compression||Note (1)||Gross section|
NOTE: (1) The maximum allowable compressive stress in any member at normal loading shall not exceed 80% of stresses permitted for static loads by AISC Book No. S326 or CAN/CSA-S16.1.