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. 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