CIP RC/PT Girder Help

Overall Design Approach

CIP RC/PT Girder performs analysis and design of frame type bridge structures. Its overall approach is based on creating a finite element analysis model using beam elements; and after analysis, perform code specification checking and design. The following steps are taken in this approach:
  • Create a structural analysis model based on input geometry (layout, cross sections, pier) and modeling (tendon, rebar) information; and apply prestress (PT), self weight (SW), dead load (DL), added dead load (ADL), uniform temperature (TU), gradient temperature (TG), live loads (LL), and pedestrian loads to it.
  • Perform a matrix structural analysis of the created model.
  • Calculate responses, including deflection, reaction, forces, and stresses due to each of the load cases and load combinations.
  • Perform the design of P-jack, f'ci and f'c, i.e., determine the minimum required values.
  • Perform AASHTO Standard (LFD) or LRFD specifications check for stresses, moment capacity, shear capacity and live load deflections.
  • Determine rebar layout for longitudinal and shear reinforcement.

Note that CIP RC/PT Girder does not adjust the analysis results based on the required P-jack or concrete strength, and all results are based on user-specified values.