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Q: What is the function of portal in bridge trusses?
  • A. To resist lateral forces
  • B. To resist horizontal forces
  • C. To provide additional stability
  • D. To allow thermal expansion
Correct Answer: Option C - Portal usually is a sway frame extending between a pair of trusses whose purpose is to transfer the reactions from a lateral bracing truss to the end posts of the trusses and then to the foundation. This action depends upon the ability of the frame to resist transverse forces. The portal is normally a statically indeterminate frame.
C. Portal usually is a sway frame extending between a pair of trusses whose purpose is to transfer the reactions from a lateral bracing truss to the end posts of the trusses and then to the foundation. This action depends upon the ability of the frame to resist transverse forces. The portal is normally a statically indeterminate frame.

Explanations:

Portal usually is a sway frame extending between a pair of trusses whose purpose is to transfer the reactions from a lateral bracing truss to the end posts of the trusses and then to the foundation. This action depends upon the ability of the frame to resist transverse forces. The portal is normally a statically indeterminate frame.