Cal. Code Regs. Tit. 8, § 3103 - Hydraulic Elevator Car Frame and Platform Stresses and Deflections
Where:
Fa = Allowable axial compressive unit stress (not exceeding 17,000-0.485(L/R)2).
Fb = Allowable bending unit stress (15,000 psi if area basis is gross section or 18,000 psi if area basis is net section).
fa = Actual axial compressive unit stress based on gross section.
fb = Actual bending unit stress.
L = Free length of uprights in inches (distance from lowest fastening in crosshead to top fastening in plank).
R = Least radius of gyration of section in inches.
The moment of inertia in the crosshead shall be not less than twice that of the stile section about an axis parallel to that of the crosshead section. The connection between the crosshead and the stile shall have sufficient rigidity to transmit the bending moment in the stile into the crosshead.
fb = KL/4HZu
where:
fb = The bending stress in each upright in the plane of the frame due to the live load W on the platform for the class of loading A, B, or C for which the elevator is to be used.
K = Turning moment in inch-pounds as determined by the class of loading by the following formulas:
K = WE/8
K = W [E/2 - 48] or K = WE/8
whichever is greater
K = WE/4
For explanation of symbols L, H, and Zu see Design Section 3101(g).
fa = Compressive stress in each upright.
The slenderness ratio L/R for uprights subject to compressions other than those resulting from buffer action shall not exceed 120.
EXCEPTION: Where the upper side-brace connections on passenger elevator car frame uprights are located at a point less than 2/3 of L from the bottom (top fastening in car frame plank), a slenderness ratio of L/R not exceeding 160 shall be permissible.
The moment of inertia of each upright shall be not less than determined by the following formula:
I = KL3/18EH
For explanation of symbols see Design Section 3101(g).
Notes
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.