Program Main Features

This program calculates the response of bridge superstructures to dead loads, superimposed dead loads, post-tensioned loads, live loads, user-defined vertical loads, and temperature loads. The program creates some default load combinations; additional custom load combinations which can be defined by the user.

CIP RC/PT Girder also calculates individual girder and total width shear, moment and deflection, axial, support reactions (including live loads), displacements (deflections and rotations), and stresses at default points-of-interest (POI) or at user-specified POIs. CIP RC/PT Girdercan check the stresses (top and bottom of girders) and the ultimate strength of the section at various stages (i.e., Initial and Final,). This program can also check or design the shear capacity of the girders, analyze or determine the approximate level of post-tensioning force required to satisfy the stress requirements, and determine the amount of mild steel required for ultimate strength.

This product is specific to post-tensioned box girder and slab bridges, and may have a monolithic connection at the bent. Span hinges and a variety of column shapes and fixity conditions can also be accommodated.

General

The design is performed according to the requirements of the Indian Road Congress.
Default working units are Metric (S.I.).
Reduce input time using predefined libraries for IRC vehicle types, mild steel reinforcement, and post-tensioning tendons. You can modify or add data to each of the custom libraries. Select IRC design vehicle groups such as Class A and Class 70R or Class B and Class 70R from the locked library loads or define a new design vehicle manually.

Analysis and Model Generation

Select from Initial and Final, or analysis cases.
User-specified points of interest (POI's).
Define piers, hinges, and abutment locations.
Define support conditions at the bottom of the columns (pin, fixed, or by stiffness).
Specify alignment information consisting of a combination of tangent, horizontal curves, and spirals.
Skew is included in the analytical model.
Create monolithic connection(s) between the superstructure and substructure, or specify Drop-Cap, with optional coupling and stiffness coefficients.
Create whole width or per girder/web models.
Analysis results viewable in text or XY graphic formats.
Pier types include drop-cap or integral/monolithic.
Input lump sum losses or specify losses per IRC specifications .
Specify unlimited number of load combinations/limit states.
Analysis results include minimum and maximum effects.
Analysis results for full bridge and individual girders.
Analysis results include individual girder/web and whole width responses for the following: influence lines, shear, moment, axial, deflection/displacements, rotations, reactions, and stresses.
Magnify exterior girder shear for effects of pier skew.

Design

Ultimate moment calculations based on equations or strain compatibility.
Calculate capacity/demand ratio at each POI for stresses, ultimate moment, and shear strength.
Top and bottom flange stresses checked.
Automatic design or specifications check for shear capacity.
Calculation of the approximate level of post-tensioning force (Pjack) required to satisfy stresses.
Automatic computation of the amount of mild reinforcing for ultimate strength.
Design layout of top and bottom flange longitudinal reinforcing.
Specify design parameters for the allowable stress factors and resistance factors.
Program-computed or user-defined live load distribution factor(s).
Program includes multiple lane reduction factors based on IRC 6.
Serviceability/distribution check performed for reinforced concrete sections.

Loads

Specify uniform temperature loads (rise and fall).
Specify superimposed dead loads (FWS).
Specify pedestrian loads.
CIP RC/PT Girder automatically computes loads due to specified Crash barriers, footpath, and wearing surfacte.
CIP RC/PT Girder automatically computes loads due to self-weight if included.
Moving live loads consist of IRC vehicles (lane and truck) or a custom vehicle.
Define concentrated or distributed user-defined loads.

Post-Tensioning

Specify linear or parabolic tendon variations, or user-defined tendon layout.
User-defined friction and wobble coefficients.
Input anchor set.
Option to input the post-tensioning jacking force or enter as a percentage of the ultimate stress.
Jacking can be specified from the left, right, or both ends.

CIP RC/PT Girder computes additional losses due to horizontal curvature effects.

Automatic computation of tendon elongations.

Post-tensioning losses computed according to IRC specification equations, or a lump-sum method.

Bridge Types

Cast-in-place post-tensioned box or I girders.
Cast-in-place reinforced box or I girders.
Cast-in-place reinforced concrete slabs.
Cast-in-place reinforced concrete T-beam bridges
Cast-in-place post-tensioned T-beam bridges
Cast-in-place post-tensioned concrete slabs.

Superstructure Cross Section

Specify parametric or user-defined section properties.
Option for transformed section properties.
Includes cross section variation along the length of the bridge for web transitions and flange/soffit thickening.
Specify linear or parabolic depth variation.
Option to recall previously defined cross sections.
Define vertical or sloped exterior webs.
Input top and bottom fillets between the flange and web junctions.

Column Shapes

Select rectangular, circular, oblong/elliptical, octagonal, or general columns.
Specify linear or parabolic column variation.
Specify unlimited number of columns at a bent.

Export

All analysis results exportable to spreadsheets.
Graphics can be exported to DXF/DGN file formats.