BRIDGE MODELLING WITH CSI SOFTWARE CSI Bridge 2017

BRIDGE MODELLING WITH CSI SOFTWARE

CSI Bridge 2017 • Version 19 – Latest release 19. 2. 1 • It’s SAP 2000 v 19, but with specific modules for bridge modeling, analysis and design • Analysis engine is exactly the same • Everything you can do with SAP 2000, can also be done with CSI Bridge • It only adds the specific modules for bridges

Modules • Classical Division of Structural Analysis Software • Preprocessor • Analysis engine • Postprocessor • Trend to add a new module • Design

Preprocessor • Similar to SAP 2000 • Introduction to the concept of parametric bridge modeling • Existence of two parallel databases: • Finite elements (classical) • Bridge objects (new) • Automatic generation of the finite elements model from the parametric bridge model, with just one click of a button • The user does not need to worry about joints, elements, meshes or loads • Great enhancement in productivity

Parametric Bridge Modeling • How can you characterize or define a bridge? • Geometrically by the horizontal and vertical layout Straight layout line Curved layout line • Any combination with straight and curved segments, for both horizontal and vertical layouts • Superelevation • Use of geographical bearings (angle with the cardinal points)

Parametric Bridge Modeling • Everything is defined with geometric reference to the layout line • Complex traffic lanes (with offsets and variable widths) • Example with 8 traffic lanes • Variable distance to the layout line • Start and end of the lanes not coincident with the bridge limits

Parametric Bridge Modeling • Wide libraries of standardized libraries • US, UK, China, Canada, Eurocodes, India, New Zealand UIC • Flexibility in the creation of user-defined vehicles • Apply vertical, braking and centrifugal load components together or separately • Flexibility in defining the loaded lanes and reduction scale factors for simultaneity • Definition of the superimposed dead loads (linear and area loads) with reference to the layout line and to the deck edges (width)

Parametric Bridge Modeling • Bridge deck sections’ library • Concrete cross-sections • Composite cross-sections • User-defined cross-sections • Defining the properties • Drawing on Section Designer • Defined parametrically, all parameters can vary along the layout line

Parametric Bridge Modeling

Parametric Bridge Modeling • Span lengths definition • Columns definition: • • height Cross section skews bearings • Abutments definition: • foundations • skews • bearings

Parametric Bridge Modeling • Plan view of spans, location of columns, skews and deck width

Parametric Bridge Modeling • Prestress • Jacking force definition • Losses calculation • Hyperstatic effects • Definition of the vertical and horizontal layout with reference to the layout line • Special module for segmental bridges

Parametric Bridge Modeling • Display the tendon locations along the layout line: • Plan view • Cross section • Elevation view

Generation of the Finite Elements Model • Automatic generation • Frame elements • Shell elements • Solid elements Frames Shells Solids

Parametric Bridge Modeling • Other definitions • • Mild rebar Staged Construction User-defined specific locations along the layout line Diaphragms • Advantages • • Great enhancement in productivity No time spent on meshes and other specific details of a finite elements model More time for Engineering tasks Exploring a greater number of different solutions

Analysis Engine • The same analysis engine used by SAP 2000 • Analyses: • Static • Linear • Nonlinear • • Geometric Nonlinearity(P-Delta effects and large displacements) Material Nonlinearity Time-dependent effects on concrete and tendons Staged Construction • Dynamic • Modal • Response Spectrum • Time-History (linear and nonlinear) • Buckling

Analysis Engine • Elements library • • Frame and cable Membrane, plate and shell Solids Links • • • Tension or compression Dampers (multiple types) Hysteretic Friction Generic (user-defined force-deformation relationship) Among others

Analysis Engine • 64 bit (>4 GB RAM) • Several solvers • Standard • Advanced • Multi-threaded (parallel computing) • Several solvers specially conceived to accelerate dynamic nonlinear analyses • Provides information for diagnosing problems in the system resolution

Postprocessor • Results display similar to SAP 2000: • Deformed shape • Forces in frame elements • Forces/stresses in shell elements Axial force in frames Deformed shape and displacement contours Membrane forces

Postprocessor • Influence lines and surfaces display Axial force in frames

Postprocessor • New module: Bridge Object Response Display Forces Displacements

Postprocessor • New module: Bridge Object Response Display Stresses

Postprocessor • New feature: bridge object response display • Bridge response for • Entire bridge section (blue) • Beams or girders (other colors) • Steel beams and deck sections in composite bridges • Exporting results to Excel

Design • Similar to SAP 2000 • Design of frame objects according to international design codes for steel and concrete structures • Reinforcement design for shell objects • Design of deck section • Serviceability Limit States • Stresses • Ultimate Limit States • Load resistance for prestressed sections • Load resistance of steel sections including class 4 sections

Design • Bridge design response display including forces vs. design forces • Exporting design results to Excel

Other Features • Automation and increased features using API (Application Programming Interface) • It is possible to create plug-ins • Programed by the user • For third-party applications • Example: Structural Optimizer from CSI • Compatible with most major programming languages • VBA (Excel, Auto. CAD, etc. ) • Matlab • VB. net and C#

Examples Prestressed Bridges

Examples Segmental Bridges

Examples Composite Bridges

Examples Cable-Stayed Bridges