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Pony truss - slenderness ratio using AASHTO / Holt method

Pony truss - slenderness ratio using AASHTO / Holt method

Pony truss - slenderness ratio using AASHTO / Holt method

(OP)
Hello,

Referring to the Holt method of determining top chord slenderness, in AASHTO Pedestrian Bridges, my question is about the CL/Pc table for finding 1/K.

C is related to the stiffness of the pony truss upright and floor beam. If L is short for example then CL/Pc is much smaller than if L is long. With a long CL/Pc then 1/K is a large value, so the inverse, K, is smaller than if L is short. It seems that a bridge with uprights spaced at for example 120" would have a lower slenderness ratio than a bridge with uprights at 24", which is not correct.

What am I missing here?

thanks, Jeff

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