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
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




