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CSiBridge V15 Enhancements
Latest release: CSiBridge 15.2.0
CSiBridge V15 Enhancements Subscribe RSS

Computers and Structures, Inc. is proud to release CSiBridge, a new comprehensive state-of-the-art software product for the structural and seismic analysis, design and rating of simple and complex bridges. All operations are integrated across a single user interface that provides an easy-to-use and intuitive workflow environment. Bridge models are created parametrically resulting in enhanced productivity, saving engineering time while redefining the standards of accuracy and versatility.

Please contact sales@csiberkeley.com or (510) 649-2201 for more information.

Significant New Features

Bridge Wizard

  • Step-by-step creation of complete bridge model
  • Detailed guidance for each step
  • Tree view of bridge model updated with each change
  • Automatically update model by changing parameters


Bridge Object Model

  • Switch between spine, shell, and solid models with single click
  • Parametric modeling of steel and concrete deck sections
  • Concrete and steel diaphragms
  • Restrainers and bearings
  • Linear/nonlinear foundation springs
  • Non-prismatic superstructure variation
  • Skewed abutments, bents, and hinges
  • Single-bearing & double-bearing bents
  • Prestress tendon layout
  • Superelevation
  • Curved beams and girders
  • Diaphragms and staggered cross-frames


Bridge Modeling Options

  • Abutments may be modeled as bents
  • Bearing properties and location may be user defined
  • Kinematic effects due to abutment and bearing geometries are included
  • Bridges may be analyzed as full 3D-shell or spine models


Layout Lines

  • Quick definition of highway layout
  • Bearings and stations notation
  • Horizontal and vertical curves
  • Spiral transitions


Section Designer

  • Arbitrary steel, concrete, or composite sections
  • Caltrans sections
  • Calculation of section properties
  • Automated fiber layout for fiber hinges
  • PMM interaction surfaces
  • Moment-curvature relationships


Parametric Deck Sections

  • Concrete box girders
  • Full parametric definition of cross sections
  • Concrete tee beam sections
  • Precast I and U girder sections
  • Steel girders with composite deck
  • Variable section definition parameters


Lanes and Vehicles

  • Lanes based on layout lines or frames
  • Width effects for lanes and vehicles
  • Auto transfer of vehicle loads to bridge structure
  • Extensive vehicle library including AASHTO and other codes
  • Custom vehicles


Post-tensioned Box Girders

  • Quick tendon layout
  • Tendons in frames, shells, and solids
  • External tendons
  • Secondary force calculation
  • Creep, shrinkage, relaxation, anchorage slip, elastic shortening losses
  • Explicit time-dependent effects in tendons
  • Automatic location of tendons in girders


Foundation Modeling

  • Pile or spread footings
  • P-Y multi-liner force deformation assignments
  • Compression only soil springs
  • Grade beams as line springs
  • Soil springs properties may be linear on nonlinear


Loading and Analysis

  • Moving loads with 3-D influence surfaces
  • AASHTO, Chinese, or user-defined nonlinear temperature gradients
  • Multi-step static and dynamic moving load analysis
  • Response spectrum and time-history analysis
  • Geometric and material nonlinearity
  • Pushover analysis
  • Buckling analysis
  • Multi-support base excitation
  • Response spectrum and time-history analysis
  • Parametric loading of superstructure
  • Live load distribution by code or analysis
  • True dynamic effects of moving live loads
  • High frequency blast dynamics using Wilson FNA


Bridge Analysis Options

  • Speed and power of the SAPFire engine
  • Large Capacity Eigen and Ritz model analysis
  • 3D Pushover Analysis
  • Multi Support Excitation Dynamics
  • Energy Dissipation Designs
  • Buckling Analysis
  • Staged Construction
  • Linear and Nonlinear Dynamic Analysis


Staged Construction

  • Segmental, composite, and other bridge types
  • Gantt chart construction scheduler
  • Creep, shrinkage, and strength change
  • Camber calculation and shape finding
  • Automatic cable tensioning
  • Add/remove elements and loads, change section properties, change supports, modify frame end releases


Cable Stayed Bridges

  • Automatic cable shape finder
  • P-Delta plus large displacement geometric nonlinearity
  • Cable target force determination
  • Full 3D gravity, wind and seismic analysis capabilities
  • Multiple point excitation for time-history analysis
  • Large deformation catenary cable analysis
  • Automatic jacking and cable-tensioning control
  • Shape-finding for camber calculation


Influence Surfaces

  • 3D Influence surface plots for joints, frames shells and links
  • Influence line or surface plots for joint displacement or reactions
  • Plots as contours
  • Plots along lane center or lane widths


Bridge Design

  • Bridge Superstructure Design:
    • Composite Steel Girder (AASHTO LRFD 2007 and 2008 interims)
    • Precast I and U Girder (AASHTO LRFD 2007)
    • Concrete Box Girder (AASHTO LRFD 2007)
    • Principal stress checks
  • Automatic load combinations
  • Design checks include:
    • Stress checks
    • Shear checks
    • Flexure checks
    • Principal stress checks


Results and Output

  • Animated displacement and stress plots
  • Graphical results on screen
  • Tabular output to Microsoft Excel
  • Analysis and Design report in Microsoft Word format


Bridge Rating

  • Concrete box girder bridges (AASHTO LRFR 2005)
  • Precast I and U girder bridges (AASHTO LRFR 2005)


Bridge Animations

  • Create real time movie files showing time-history and moving vehicle responses
  • Include multiple vehicles
  • Displays may include displacements and stresses


Step-by-step seismic design of bridges per AASHTO Seismic Design Guide
CSiBridge V15.0.1 Enhancements Subscribe RSS

Significant New Features

  • A new option has been added for the modeling of I-girders in composite steel-girder superstructure sections. In addition to the existing options to model the I-girders as frame objects or as area objects (for both web and flanges), the girders can now be modeled using area objects for the webs and frame objects for the flanges.
  • A new bridge seismic design check has been added to the Chinese version that follows the Chinese code JTG/T B02-01-2008, "Guidelines for Seismic Design of Highway Bridges".
  • Bridge design for prestressed concrete box girder superstructures using Chinese code “JTG-D62-2004” in the Chinese version has been updated as follows: (1) The effect of existing longitudinal rebar is now accounted for in flexural design. (2) A new design check has been added for tendon stress.
  • The Chinese 2002 building design codes are available for concrete and steel frame design in the Chinese version.
  • Concrete frame design has been enhanced to improve the smoothing of P-M-M interaction surfaces in those rare cases where they become non-convex due to kinks in the P-M curves.
CSiBridge V15.1.0 Enhancements Subscribe RSS

Significant New Features

  • Built-in European concrete and steel material properties.
  • Display and output of frame stresses.
  • Load optimization feature to determine the optimal loading scale factors to achieve goals and limits on displacement and force response throughout the structure.
  • Canadian NBCC 2010 loading for wind, seismic, and response-spectrum.
  • American ASCE-7 loading for wind, seismic, and response-spectrum.
  • Italian NTC 2008 response-spectrum functions with geographic database.
  • Specialized bridge groups may now be specified within each bridge object. Each bridge group applies to a particular type of component (slab, girder, bearing, etc.) and an individual bridge object. Depending on the bridge group type, groups may be defined for multiple items, multiple longitudinal ranges, and/or multiple transverse ranges.
  • The specification of rebar for the bridge object superstructure has been enhanced. Distances are now measured along each individual girder. Longitudinal rebar is located relative to the center of the supports or the centers of the girder spans, and shear rebar is located relative to the ends of each girder span.
  • A new design request type has been added for steel I-girder composite bridge superstructures to account for the constructability check according to the "AASHTO LRFD 2007" code, including the 2008 interim provisions. Composite and non-composite behavior can both be considered, with or without using staged-construction analysis.
  • Bridge load rating has been added for steel I-girder composite bridge superstructures according to the AASHTO "Manual for Bridge Evaluation", First Edition, 2008. Separate rating requests are provided for the service and strength checks of both composite and non-composite superstructures. Live-load distribution factors can be automatically calculated using code formulae, specified by the user, or determined from a detailed 3-D live-load analysis.
  • For flexural-strength superstructure design checks by the AASHTO LRFD 2007 code, the effect of user-specified reinforcement is now included for the prestressed box-girder and precast-girder composite sections. Previously only the effect of the concrete and tendons were included in these checks. The effect of reinforcement for the slab of steel-girder composite sections was already being considered.
  • Design checking has been implemented for concrete superstructure sections according to the Canadian "CAN/CSA-S6-06" code. Superstructure types supported include prestressed concrete box girders and composite sections with precast I-girders and U-girders. Separate design checks are provided for stress, flexural strength, and shear strength using MCFT (modified compression field theory). The effect of mild reinforcing is included as well as the prestress tendons. Live-load distribution factors can be automatically calculated using code formulae, specified by the user, or determined from detailed 3-D live-load analysis.
  • Automated load combinations and design load types have been added as required for bridge design according to the Canadian code CSA-S6-06.
  • Canadian steel frame building design code CSA S16-2009.
  • Other minor enhancements.
CSiBridge V15.1.1 Enhancements Subscribe RSS

Significant new features:

  • User-defined stress points may now be specified for Section Designer frame sections.
  • Plotting of bridge superstructure results now includes an option to show the hyperstatic (or secondary) forces and moments acting on the superstructure cross-section for load cases and combos representing prestressing load.
  • The OAPI (Open Application Programming Interface) has been changed so that multiple instances of CSiBridge can now be started from an external program or script.
  • New functionality has been added to the Open API (Open Application Programing Interface) for the design codes.
CSiBridge V15.2.0 Enhancements Subscribe RSS

Significant new features:

  • Design checking has been implemented for concrete superstructure sections according to the "Eurocode EN 1992-2" code (EN 1992-2:2005, Eurocode 2: Design of concrete structures - Part 2: Concrete bridges - design and detailing rules). Superstructure types supported include prestressed concrete box girders and composite sections with precast I-girders and U-girders. Separate design checks are provided for stress, flexural strength, and shear strength using MCFT (modified compression field theory). The effect of mild reinforcing is included as well as the prestress tendons. Live-load distribution factors can be specified by the user or determined from detailed 3-D live-load analysis. Design results are displayed graphically for the entire box section, or on a girder-by-girder basis for multi-celled box girders and composite sections. Detailed tables showing all results and intermediate values are available for display, printing, and export to Excel or Access.
  • Load combinations and design load types have been added for bridge design according to the code EN 1991-2:2003, Eurocode 1: Actions on structures - Part 2: Traffic loads on bridges.
  • Vehicle loads have been added bridge design according to EN 1991-2:2003, Eurocode 1: Actions on structures - Part 2: Traffic loads on bridges.
  • Standardized vehicles are now categorized by Region and Standard, making it easier to add and modify new vehicle loads.
  • A vehicle class is now automatically created for each vehicle so that the user only needs to create vehicle classes when multiple vehicles are to be enveloped.
  • For the optimization of steel-girder bridge design, the "As Designed" location of web stiffeners last used for recalculating the resistance is now saved if the model is unlocked or saved as a new model when closing the optimization form.
  • Steel frame section properties for the AISC Shapes Database Version 14.0 are now available in the section-property database files for U.S Customary and metric units.
  • The definition of material properties has been enhanced to allow user-defined standard materials through the use of XML files. Properties are segregated by region and by code-standard within these files as well as when using the materials in the graphical user interface.
  • New Chinese materials are now available to define concrete, steel, rebar, and tendon properties according to JTG, TB, and GB standards.
  • Concrete materials are now available having properties consistent with the Spanish code "EHE - Instrucción de Hormigón Estructural.
  • Italian material definitions have been added for: (1) Concrete according to standard UNI EN 206-1:2006 and UNI 11104:2004, (2) Steel and rebar according to standard NTC2008.
  • Other minor enhancements.