Integrated Structure Wizards
midas Gen has various structure wizards to expedite the modeling of structures. For example, you may use the Arch Wizard to create an arch without having to individually model each member. Instead, you simple need to enter parameters such as total arch length, segments spacing, and curvature. The program will then automatically generate the arch for you based on the parameters you entered. The same functionality applies to the wizards that generate frame, beam, truss, and column structures.
For high-rise buildings, multiple stories and floor diaphragms can be automatically generated. For conventional building types, the building generation wizard can be used to generate the entire model. The wizards eliminate the need for repetitive and tedious modeling steps that cumulatively lead to significant amounts of time being expended. These wizards are of particular for projects that contain structures that are comprised of many elements and complex geometry.
A wide assortment of loading options are available for the application of various load types and cases. midas Gen generates static wind and seismic loads on a building structure for each story. All one has to do is to provide the applicable standard and the building data. An extensive database of the most widely used wind and seismic load codes is available.
midas Gen's floor loading function enables you to specify uniformly and distributed dead and live load on specific areas of the floor. The floor loads are then automatically distributed and applied to the individual support elements. This feature saves a tremendous amount of time for larger scale projects such as high-rise buildings in which floor loads must be applied to dozens of floors and the loads must be applied to hundreds of beams, girders, and columns. Modeling these loads may can take exorbitant amounts of time with other programs, but they can be done in just a few minutes with midas Gen.
Hydrostatic pressure loads can be generated by inputting parameters related to fluid and structural properties. This capability makes it possible to design dams, levees, and other fluid retaining structures. The full gamut of seismic loading options are available. Static seismic, time history, pushover, response spectrum, ground acceleration and dynamic nodal loads each have their own specialized modeling interface. Thus with midas Gen you can perform both response spectrum analysis for conventional projects as well as time history analysis for high-end projects such as high-rise buildings or industrial plants built in high seismic zones that require detailed calculations of seismic floor vibrations.
Construction Stage Analysis
Most structural design projects require some degree of construction stage analysis to account for changes in temporary structures, construction loads, and material properties over the course of the construction sequence. A common and less efficient method of performing construction stage analysis is to individually model and analyze each stage. midas Gen enables you to model all of your construction stages off of single base structure. Common elements, loads, and boundaries duplicated for each stage while construction loads and temporary structures can be activated and deactivated to simulate progress of construction. This feature significantly reduces the amount of time and effort required to model detailed and lengthy construction stage sequences.
midas Gen's construction stage analysis capabilities can also calculate the effects of time dependent properties of concrete such as modulus of elasticity, creep and shrinkage. Change in material properties are reflected while simulating construction sequence with respect to the changes in geometry, boundary conditions and loads relative to time. Once the stages are all modeled, the post processor will analyze all of them simultaneously and will generate a separate output file for each stage. This enables you to conveniently view the changes in shear stresses, moments, displacements, axial compressions, and with each progressive stage.
Pushover analysis of 3-dimensional frame structures for performance based designs can be done for reinforced concrete, structural steel and steel-concrete composite sections.
Hinge connections are essential to pushover analysis in order to simulate displacement. Various hinge types for trusses, beams, columns, walls, and springs. Multi-linear hinges and user-defined hinges can be defined as well.
Hinge displacement control and force control features enable you to model force and displacement incrementally. This makes it possible to calculate the reactions of the structure over the course of several sequential steps. This capability is essential in pushover analysis since displacement due to seismic loading occurs incrementally and must be modeled as such in order to create an accurate simulation.
The program also checks for key design criteria such as drift limits, deformation, and strength capacity. This function saves you the time and effort of having to check these design limits yourself.
Inelastic Time History Analysis
midas Gen's seismic analysis functionality also includes highly detailed time history analysis for complex, high-end projects. For the seismic design and assessment of a structure, midas Gen offers a wide range of hysteresis hinge models such as kinematic hardening, Takeda, slip, etc. in the inelastic time history analysis. Hysteretic links have multi-axial response which makes them useful for simulating dynamic loading. Thus they are used to model the energy dissipation which occurs during the analysis.
A database of time history records is included so that you can use the parameters of prominent earthquakes in your project area for your analysis. Thus, you will not need to look up the records on your own and input they yourself. However, it is also possible to import your own time history records should you ever have the need.
Design and Results
Optimal Design Calculator
midas Gen's optimal design feature determines the section dimensions automatically for the minimum sectional area and satisfies the specified design standard through the verifying strength ratio (or stress ratio) in iterative analysis. This is widely used by engineers as a streamlined method of selecting the optimal section shape. This feature will you time that would have been spent on iteratively running the analysis for a variety of sections. This feature also ensures that the optimal section will be calculate, thus eliminating the margin of error that exists when attempting to manually calculate the optimal section.
To accommodate for high-rise building design, midas Gen calculates key criteria multi-story analysis. Story drift is calculated to account for static and dynamic seismic loads. Story shear is calculated for response spectrum and time history loads. The story shear force ratio is also calculated for the columns and shear walls. Results are generated for each story. Thus highly detailed reports for multi-story buildings can be created without the tedious process of modeling each story separately.
Material and Section Properties
In addition to a comprehensive database of section and material properties, midas Gen also has a section property calculator for modeling irregular sections, a tapered section function for modeling haunched beams, a section stiffness scale factor for considering stiffness of cracked sections, a wall element option for modeling shear walls, and a wall stiffness scale factor for considering decreases in shear stiffness due to openings. These applications can be cumbersome to model without specialized functions, but midas Gen will automatically perform all the lengthy calculations and checks after the parameters have been entered.