midas Civil

A higher standard of bridge design

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Complete Analysis Options


 

 

Construction Stage Analysis

A specific construction stage pertaining to a structural model can be exported as a final stage. With this option, users can perform time history, seismic or moving load analyses at various stages of construction.   0bd9c090-6322-4478-91e6-2eabdc829a6b

The stage tree provides a systematic outline of the entire construction sequence defined for a model. Data defined for a specific construction stage can be readily modified. 

Any construction stage can be easily deleted, or new stages can be inserted. The order of construction stages can also be revised. 

The works tree allows you to systematically check and revise the structure and loading conditions for each construction stage.

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Define each stage based on sequential structural changes reflecting erection and dismantlement of temporary structures, varying boundary conditions, etc.

Define timing steps representing the timing of loading and unloading specific load cases within a given construction stage, without any change in structure

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The construction stage analysis feature allows the user to specify activation and removal of elements with varying maturities, changes with boundary conditions and changes with loadings during the construction sequence. As such, construction stage analysis reflects the erection and dismantlement of temporary structures, complex bridge analysis, construction stage analysis of PSC box bridges reflecting temporary structures, and heat of hydration analysis based on the concrete pour sequence.

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Moving Load Analysis

midas Civil automatically generates a transverse analysis model from the global analysis model. Upon selecting a point in the primary direction, the wizard generates a 2-dimensional frame model, which intersects the point, generating the section properties for analysis. In addition to the geometrical section properties, the user can also assign loads (ex. dead loads, live loads, etc.), tendons and reinforcements.   e70bdd4c-cac2-4ec9-9eb0-5475c07144bf
The moving load tracer determines the location of a moving load that imposes the maximum member forces. Forces and stresses in beam members resulting from detailed analyses of individual elements can then be verified with beam diagrams. With plate models, the local direction force sum combines the nodal forces of plate or solid elements and calculates the member forces at specified positions.   15171b3a-4822-44a5-9230-cd32393db234

For moving load analyses, midas Civil provides a database of standard vehicular loads. Users can also define separate vehicular loads.Available moving load database includes:

- Standard

- AASHTO LRFD

- PENNDOT

- Canada

- BS Eurocode

- China

- India

- Taiwan

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Analysis of Composite Girder Bridge

midas Civil provides various features for composite girder bridge design where it is important to check the member forces for both before and after composite actions. This eliminates the need to managing two different analysis models and results.

 

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Composite section can be easily defined with built-in DB or User defined section. The real benefit of composite section is that we don’t have to create two model files to represent two stages before composite and after composite action.

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midas Civil provides various features for composite girder bridge design where it is important to check the member forces for both before and after composite actions. This eliminates the need to managing two different analysis models and results.

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Analysis of Composite Girder Bridge

Overview 

The prime concern in integral bridges is the effects of temperature variations on the deformation of bridge deck. Expansion and contraction of the bridge deck affects the backfill soil adjacent to the abutments. Backfill compaction due to deck expansion and soil slide due to a deck contraction is repeated. Due to the repeated backfill compaction and soil slide, the modulus of subgrade reaction and the pressure distribution of backfill vary with depth. 

For this, Midas Civil provides Multi-linear type point spring support. Also the program can automatically calculate the soil stiffness by entering the required data such as soil type and subgrade reaction.

 

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Analysis of PSC Box Bridge

Production of maximum stresses at the left/right sides on a transverse cross section of a curved bridge.

Production of member forces of the structure when the maximum force due to a moving load is applied.

Production of various diagrams (member forces, stresses, displacements, reactions, etc.) for reviewing analysis results for each construction stage (stages & time steps)Provision of animations of analysis results for each construction stage.

Output of detail analysis results of a particular section.

Report on prestress losses due to curvature and time variation.

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Tendons can be defined at any location and checked with transverse cross sections.

Short-term prestress losses are considered for the effects of anchor slippage of tendons, friction between tendons and sheaths, and elastic concrete shortening.

Long-term prestress losses are considered for the effects of creep, shrinkage and relaxation of tendons.

Variation of prestresses in tendons are considered for the effects of loading and temperature changes.

 

 

 

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Calculation of prestress loss for tendons with 3D profiles or curvatures Prestressing effects considered for pre-/post-tensioning and internal/external placing methods Free tendon Placement irrespective of nodes

 

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midas Civil provides standardized PSC box sections for PSC box girder bridges for easy and practical modeling and analysis.
Where variable sections exist in a member, within a FCM bridge for example, section properties are automatically calculated upon defining the end sections, and the rate of curvature.
Longitudinal & transverse variable sections can be specified.
When automatically generated variable section data are partially modified, the related sections are automatically updated in the model.
Effective widths are automatically calculated as per design codes and subsequently applied to analysis.

 

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midas Civil provides various features for composite girder bridge design where it is important to check the member forces for both before and after composite actions. This eliminates the need to managing two different analysis models and results.Time dependent material properties are defined to reflect the variation of modulus of elasticity relative to concrete maturity and the long-term deflection effects due to creep and shrinkage.

midas Civil supports time dependent material according to following codes:

CEB -FIP (1990)
CEB -FIP (1978)
ACI209 (1982)
PCA (1986)
AASHTO (2006)
INDIA (IRC: 18-2000)
EN1992-2:2004
User Defined

 

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Segmental Bridge Construction Analysis

midas Civil automatically generates the composition of construction stages and models for MSS/FSM bridges.   4d98bd0f-a4bf-4b36-8137-1756157bb0cf
An FCM bridge model with construction stages can be automatically generated after defining only cross sections, tendon placements and bridge configuration data.
Sections and tendon placements are defined within the wizard.
The wizard defines the entire bridge model including piers and key segments.
Capable of real-time display of construction stages automatically generated by the wizard FCM Bridge Wizard.
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An FCM bridge model with construction stages can be automatically generated after defining only cross sections, tendon placements and bridge configuration data.
Sections and tendon placements are defined within the wizard.
The wizard defines the entire bridge model including piers and key segments.
Capable of real-time display of construction stages automatically generated by the wizard FCM Bridge Wizard.
Using the ILM bridge model wizard, enter the number of segments and the corresponding data to generate the entire bridge configuration. Basic construction stages (activation of segments) can be automatically generated on the basis of the number of segments entered.

Using the bridge data, the number of days for the construction of each segment and each launching length, a detailed construction stage for each launching stage (with activation and deactivation of supports) is automatically generated.
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Suspension Bridge Analysis

Composed of flexible cables. The suspension bridge wizard in midas Civil automatically calculates the cable coordinates and tensions of the final structure. Also, using 3D elastic suspension line elements and equivalent truss elements, midas Civil can consider nonlinear characteristics of the cables. It supports geometric nonlinear analysis as well as construction stage analysis.   db3e82c2-5afd-4dd5-9eab-b73a4734e378
Composed of flexible cables. The suspension bridge wizard in midas Civil automatically calculates the cable coordinates and tensions of the final structure. Also, using 3D elastic suspension line elements and equivalent truss elements, midas Civil can consider nonlinear characteristics of the cables. It supports geometric nonlinear analysis as well as construction stage analysis.   326925ef-8e50-40b9-a4cf-5972e306a47b

Heat of Hydration Analysis

midas Civil provides heat of hydration analysis capabilities considering heat transfer and stresses. Heat of hydration analysis with construction stages reflects the changes of the modulus of elasticity due to maturity, effects of creep and shrinkage, pipe cooling and concrete pour sequence.   79ead1d8-432e-4734-906c-93485a4649f1
midas Civil provides heat of hydration analysis capabilities considering heat transfer and stresses. Heat of hydration analysis with construction stages reflects the changes of the modulus of elasticity due to maturity, effects of creep and shrinkage, pipe cooling and concrete pour sequence.   d3f6d21c-817b-4e1e-8559-b43f3df46c52