User-defined sections can be created using the Sectional Property Calculator (SPC). *.dxf files can be directly imported, making it easy to create sections. The section property calculations are provided for the input section configuration by generating fully automated optimum meshes. Furthermore, it is possible to create composite sections composed of several materials.

A scale factor for moment of inertia (Iyy) about y-axis can be applied to check sectional stresses reflecting an effective width. Scale factors for the distances from the neutral axis to the top and bottom extreme fibers (z_top & z-bot) are also specified. The scale factors are applied only to stress calculations and do not affect the calculations for forces and deflections. For steel composite sections and prestressed concrete sections, additional options that calculate the effective width are provided.

midas Civil provides two types of design check in Composite Design (Composite Steel Plate Girder Design & Composite General Section Design). By inputting the design variables, longitudinal & transverse stiffeners information, and shear connector information into the Composite Design function, the design can be reviewed for the entire model or for selected sections. The design results can be checked in the detailed report, table, and graphical views.

The Tapered Group function makes it possible to create tapered sections more quickly. This function is also provided to solve the inconvenience of creating multiple tapered section properties when tapered sections are applied to multiple elements. By using the tapered group function, the user can implement cross-sectional changes in multiple elements linearly or polynomially. This function is available for all structures with varying sections including balanced cantilever bridges, arch rib with tapered sections, etc.

This function is used for buckling analysis in midas Civil. After a simple setup, the program proceeds with the buckling analysis using the geometric stiffness matrix and the stiffness matrix of the structure. The geometric stiffness matrix is calculated from the static load analysis results selected by the user.

The Steel Design function verifies the strength of overall steel members reflecting live load reduction factors, correction factors for seismic loads and moving loads. It also reanalyzes and reevaluates strength for selected members due to varying design properties and criteria. It provides an optimal section design feature.

The Prestressed Composite Bridge Wizard makes it easy to model precast girder bridges. Both straight and curved bridges are possible, and boundary conditions, dead loads, and moving loads are considered for the basic model required for structural analysis. Furthermore, construction stage is considered simultaneously; therefore, the user can review the construction stage composition of Precast girder bridges.

The Tendon Property function allows the user to consider the tension method and the time dependent properties of tendons. The Tendon Profile function can implement the shape of the tendon as coordinates, and accurate structural analysis can be performed by setting detailed options such as the transfer length and debonding length into the Tendon Profile function. In the Tendon Prestress function, jacking force (or jacking) can be considered, so the actual tensioning can be implemented accurately. Tendon optimization can be an iterative modeling process. For this inconvenience, the Change Tendon Profile function is provided.

In the Load Combination function, the user can combine several load cases used in structural analysis. Among the various options provided by the Load Combination function, the Auto Generation option creates load combinations that satisfies the desired design standards of the user.

An alternative way to apply earth pressure loads is to assign appropriate spring supports to the abutment and/or piles to represent the soil properties. midas Civil provides an automatic generative function for the calculation of the spring stiffness for abutments and piles. The calculation method is based on the formulation proposed by B.M. Lehane.

The Hydrostatic pressure load function can be applied to plates, plane stress, plane strain, or solid elements. Originally, it is a function that inputs pressure loads due to the flue potential, but it can be applied to the earth pressure as it can be considered for not only linear shapes but also curved shapes.

The thermal contraction/expansion of the deck influences the earth pressure. It is one of the design conditions for the abutment wall. midas Civil provides element temperature loads, temperature gradient loads, etc, to consider all thermal load types.

Domain and sub-domain settings are required to perform design for plate elements in midas Civil. After setting up to the sub-domain, Plate Beam or Plate Column Design of the RC design function and the checking function can be used.

Different load (analysis) cases can retain separate boundary conditions within a model. Even in the case where static analysis and dynamic analysis are associated with different boundary conditions, the two analyses can be carried out within the same model instead of two different model files.

In the RC Design function, the user can perform section review according to country-specific design standards. Furthermore, inputs required for design can be easily entered. The RC Design function is divided into Design and Checking. The Design function uses analysis results and design inputs to design each member, and provides the optimal amount of reinforcement needed for the structure. The Checking function performs component specific design using analysis results and design inputs, and reviews the appropriate design conditions.

midas Civil offers a variety of wizards for structures that are frequently modeled by engineers. Through the wizard, users can quickly solve repetitive modeling tasks or defining many construction stages. Furthermore, the wizard is provided based on the construction method or the shape of the structure. e.g.)Contruction method (ILM Bridge Wizard, FCM Bridge Wizards, MSS Bridge Wizard, and FSM Bridge Wizard), Structure type (Suspension Brigde Wizard, Cable-Stayed Bridge Wizard, RC Slab Bridge Wizard, RC Frame/Box Wizard, Grillage Model Wizard, and Transverse Model Wizard).

General Section Designer is a tool that calculates the section properties, interaction curves, moment curvatures, and stress distributions of the general shape of sections.

Heat of hydration analysis of massive concrete structures can be performed using the solid element and construction stage analysis functions in midas Civil. Furthermore, ambient temperature analysis and stress analysis can be performed using the functions provided.

The Cable Stayed Bridge Wizard is a function that is available for user modeling convenience. With this function, the user can create a 2D model considering the symmetrical and asymmetrical shape of cable stayed bridges, the shape of girders (trusses or beams), and the elevation of bridges.

The Unknown Load Factor is an optimization function for determining the optimal load factor that satisfies specific constraints of structures. It can be used effectively to calculate the initial tension introduced into cables of cable-stayed bridges or to obtain jack-up loads for adjusting the moment distribution of long-span bridges

Several repetitive calculations are required in order to calculate the optimum cable tension in a cable-stayed bridge. However, the Cable Force Tuning function is used to shorten this repetitive calculation process by calculating the displacement/member force/stress effects on the cable tension (or load factor) adjusted by the user using the influence matrix. The outputs or results are then shown in a real-time graph.

The FCM Wizard creates an analytical model by considering the bridge model, loads, and construction stage plans. The FCM Wizard provides a simple and clear input box which allows users to easily create and review bridge models. Furthermore, the FCM Wizard provides two analytical model methods to create balanced cantilever bridges of various shapes.

midas Civil provides FCM Camber Control, FCM Graph View, and Table functions in order to clearly derive the results of the construction stage analysis of balanced cantilever bridges. The amount of camber is shown in tables and graphs throughout the entire construction stage.

midas Civil provides design optimization according to various design standards including AASHTO, Eurocode, BS code, IRC and AS code. Structural design (structural analysis to section design) can be quickly performed in one model file. Furthermore, design is performed separately of structural analysis, enabling rapid design optimization.

The Suspension Bridge Wizard function automatically generates 2D or 3D suspension bridge models while calculating the undeformed lengths of cables and hangers at the same time. Upon finilizing the model, the final undeformed lengths, the geometric shape, and the internal member stresses are calculated using the function in the Suspension Bridge Wizard Control.

The suspension bridge model needs to be analyzed in order to determine ther accurate initial configuration of the global system of a bridge. Two options are provided for the analysis. The Initial Force method determines an initial configuration of a suspension bridge model by updating initial forces. The Optimal Approach method determines an initial configuration of a suspension bridge model by updating design parameters that satisfy the specified constraint condition.

The effect of large displacements can't be ignored when calculating forces for the erection of suspension bridges. Nonlinear construction stage analysis is carried out while reflecting the equilibrium element nodal forces calculated in the completed state analysis. Construction Stage Analysis Control provides several options for large displacement analysis, geometry nonlinear, and cable force analysis.

The moving load analysis in midas Civil is effectively performed based on the influence line/surface analysis. To do this, create a traffic line lane or traffic surface lane. It is possible to define traffic lanes for various shapes of elements. Furthermore, by providing options to respond to country-specific design standards and structure types, it is possible to define traffic lanes according to the intention of the engineer. In particular, the optimization function allows the program to automatically consider the location of more moving loads without defining additional traffic lanes.

midas Civil provides vehicle load models for each country-specific design code. Furthermore, user-defined functions are also provided to cope with various design environments. In the moving load case function, the user can define moving load cases that meet the country’s design standards by combining traffic lanes and vehicles.

When moving load analysis is completed, the user can check the envelop results of the analysis, such as the maximum/minimum member force/displacement. The moving load tracer function shows the distribution of the vehicle moving load that represents critical results of the analysis with influence line/surface diagrams. Furthermore, this function selects a specific moving load and converts it to a static load so that it can be used as a load for further analysis.

In midas Civil, the user can consider time-dependent characteristics of concrete such as Creep, Shrinkage, and Aging. Furthermore, the user can also consider the time-dependent characteristics of steel such as the relaxation. All time-dependent characteristics are based on the design code, and user-defined options are also provided to consider various design conditions.

Constitute the planned construction stage in the Define Construction Stage function. In midas Civil, the construction stage consists of groups of elements, boundaries, and loads that are activated/deactivated in each stage. Each stage can be subdivided into steps, allowing various construction stages to be compromised.

The Construction Stage Analysis Control provides various options for efficiency improvement. The user can also increase the accuracy of the analysis results by using options related to geometric nonlinearity, time-dependent materials, cables, tendons, and more.

midas Civil provides methods for using eigen vectors and ritz vector for the eigenvalue analysis. The eigenvalue analysis provides the main dynamic characteristics of a structure such as vibration modes (mode shapes), natural periods of vibration (natural frequencies), and modal participation factors.

In midas Civil, it is possible to analyze the response spectrum for the Z direction and the X-Y plane direction of the global coordinate system. For the modal combinationm, the user can use the Complete Quadratic Combination (CQC) method and the Square Root of the Sum of the Squares (SRSS) method depending on the user’s choice. Design spectrum and earthquake data for seismic design are provided by region and design codes.

midas Civil provides a modal superposition method and direct integration for time history analysis. The Time forcing function allows users to consider dynamic loads such as ground acceleration, dynamic nodal loads, and time varying static loads in order to perform various different analyses. Furthermore, it also allows users to consider time variable static loads for various analyses.

General Link elements are used for modeling damping devices, base isolators, compression-only or tension-only elements, plastic hinges, soil springs, etc. General Link elements can be assigned to linear and nonlinear properties using spring properties.

Users can quickly apply settings for nonlinear analysis in the Nonlinear Analysis Control function. Iteration methods for nonlinear analysis are provided with Newton-Raphson, arc-length, and displacement control. Three different methods (Energy Norm, Displacement Norm, and Force Norm) are provided to adjust the convergence of analyses.

midas Civil provides pushover analysis to support a performance-based design. The Pushover Global Control function provides detailed options for analysis. After completing the analysis, the user can review the analysis results in tables, graphs, texts, etc.

Rail Track Analysis Model Wizard receives simple input values for rail, bridge structure, and embankment models, and automatically creates an analytical model that includes sections, boundary conditions, and loads. The wizard provides three modeling options:
- Automatic modeling for simplified separate analysis
- Automatic modeling for moving load analysis
- Automatic modeling for stage analysis

As a post-processing feature, Rail Track Analysis Report Wizard can be used to analyze all models and obtain compiled excel files. It provides a final summary sheet with checks based on UIC 774-3. These check limits are manually modified for regional codes. The report will contain tabulated data as well as graphical outputs for individual rail stresses, rail and deck relative displacements, and deck absolute displacements.

Generate time-forcing functions without considering the length of the element along the track. The required nodal spacing along the track is automatically detected by the program. The train load generator function also creates a time-force curve for train loads. Furthermore, the dynamic nodal load for time history analysis is automatically inputted using the time-force curve created in the node located in the designated track.

The user can apply spring stiffness to nodes using the Point Spring function. Linear, compression/tension-only, and multi-linear using user-defined force-displacement curve are used to define the spring stiffness. If the spring stiffness data is available, the user can consider spring supports by entering the stiffness value directly into the 6x6 stiffness matrix using the general spring function.

The surface spring function applies spring stiffness per unit area or unit length to selected elements. Spring support can be considered for analysis purposes by providing two methods. A nodal spring method which distributes stiffness to nodes, and a distributed spring method which distributes stiffness evenly to elements.

In order to derive a more accurate p-y curve of the soil, the user can collaborate with MIDAS IT’s geotechnical program GTS NX. After modeling the structure in midas Civil, the user can import the model into GTS NX. Furthermore, for the accurate Soil-Structure Interaction Analysis, analysis results such as displacement or reaction forces of nodes applied with spring supports can be exported from midas Civil to GTS NX. And the p-y curve of spring supports can be imported from GTS NX to midas Civil.