Software details, features and how to purchase

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WinSEISAB is an analysis tool that allows the bridge engineer to keep pace with developments in seismic design of bridges.

WinSEISAB analyzes bridge structures to determine the seismic demand placed on various bridge components. The program capabilities include the analysis procedures specified in the 1996 AASHTO Standard Specifications for Highway Bridges Division I-A Seismic Design.

MODEL GENERATION is included in WinSEISAB to eliminate user specification of the numerous nodal points required to model the dynamic characteristics of a bridge subjected to earthquake ground motions. In addition, to simplify the input process for a response analysis, numerous default values are assumed to minimize required user input data.

HORIZONTAL ALIGNMENT of the roadway layout line is easily described using information which generally appears on the bridge general plan. The coordinates are generated along the bridge superstructure centerline from the specified layout line. The bridge centerline may be offset from the layout line. Multiple reversed curves and broken alignments are permitted in WinSEISAB.

SPAN data is used to describe the superstructure configuration and cross section and material properties. Predefined cross section and material properties can be specified to take advantage of repetitive occurrences. Non-prismatic spans are modeled as a series of prismatic segments and additional span weight can be specified on a segment basis.

SUPPORTS are easily described using the ABUTMENT and BENT information panels. Supports may be directed normal (perpendicular or radial) or skewed with respect to the bridge centerline. Multiple column bents, which may be offset with respect to the bridge centerline, are easily described using WinSEISAB column layout capabilities.

CONNECTION designations such as PIN, FIX, TRANSVERSE and FREE are used to describe connections at abutments, bents and hinges. Alternatively, individual support bearings can be modeled using the WinSEISAB Bearing Element.

EARTHQUAKE RESTRAINER units may be included at abutments, bents and hinges. Output results include hinge displacements and restrainer forces.

FOUNDATION soil springs and pile footings may be included at the abutments and bents to model soil foundation effects.

RETROFIT DETAILS DATABASE is an optional add-on module containing over 200 seismic retrofit details used by the California Department of Transportation, Caltrans, during its Phase I, II and Local Agency seismic retrofit programs.

Please send all inquires to Koung Thao at

WinSEISAB Features

  • Window Graphical User Interface
  • Complete Bridge Model Generation to Determine Seismic Loads
  • Analysis Types: Static (Dead Load), Uniform Load Method, Single Mode, Frequency and Response Spectrum.
  • Response Spectrum Curves: AASHTO, Old Caltrans, Caltrans SDC (ATC32) and Arbitrary
  • Horizontal and Vertical Acceleration Loadings
  • Include Earthquake Restrainers and Foundation Soil Springs
  • Combination Factor, Default = 0.3
  • Graphics: Undeformed Structure, Node Numbers, Static Displacements, Mode Shapes and Animation
  • English and Metric Output Reports
  • PennDOT approved software
  • VERSION UPDATED: User can now open a dialog that graphically displays the layout of piles within the footing
  • VERSION UPDATED: A new mass participation table is now reported along with the vibration characteristics. The new table includes the mass participation per mode and the total accumulated mass participation
  • VERSION UPDATED: A system of graphics that help post-process the results has been added
  • VERSION UPDATED: Column tolerance - US vs SI update
  • VERSION UPDATED: FE connections - The number of allowable member connections as a node was increased from 50 to 100 in RENUM
  • VERSION UPDATED: Piles and representation of pile footings are now shown in the model graphics
  • VERSION UPDATED: Distinction was made between frequency and circular frequency
  • VERSION UPDATED: AASHTO ARS curve according to AASHTO guide specifications for LRFD seismic bridge design 2011 2nd edition now added TO v5.1.0

Our Software Selection


    WinSEISAB is an analysis tool that allows the bridge engineer to keep pace with developments in seismic design of bridges.

  • WinABUD

    WinABUD designs or checks a reinforced concrete abutment using the 1996 AASHTO with Interims and Revisions by Caltrans.

  • WinRECOL

    WinRECOL analyzes, designs or checks a reinforced concrete columns.

  • WinFAD

    WinFAD is a computer program developed to assist the bridge engineer in designing or checking spread and pile concrete footings subjected to eccentrically applied axial loads that produce biaxial bending moments.

  • WinBDS

    WinBDS analyzes or designs orthogonal bridge frames and is applicable to the majority of concrete bridges being designed today.

  • CAPP

    CAPP is a fully functional 2-D pushover program with unique and unprecedented analytical and modeling capabilities.


    AVI FILE CREATOR allows the user to create computer animation of the section under the applied loading while simultaneously showing a graph of the response.

Software Requirements and Ordering Information

WinSEISAB is a Windows based program that runs under any Windows 32-bit OS, and has the following hardware requirements.
  • 16Meg RAM (32Meg of RAM recommended)
  • 5MB of free hard drive space needed for WinSEISAB
What is included?
  • Software media
  • On-line Help System
  • Warranty
  • 30 Day Free Support
Please send inquires to Koung Thao at
Annual support, maintenance and enhancements will be provided by TRC for an additional, optional fee.

Customer Support includes:
  • Customer assistance by fax,telephone and e-mail.
  • Assistance in data preparation and interpretation of results.
You can always email our technical support at