Frame Analysis In Staad Pro Manual Download

Frame analysis in staad pro manual download

STADD PRO Analysis of a Portable Frame- Tamil

This section illustrates the analysis and design of the lateral frame elements in an integrated model. This section can only be completed if you have licensed and installed the RAM Frame module.

3D Structural Analysis and Design Software

A little background information is needed before beginning work with the RAM Frame program. In Analysis Mode , the structure is analyzed for individual load cases. Results for the member forces, reactions, drift etc can be obtained for the individual load cases in the Load Cases sub-mode, or the results can be combined in the Load Combinations sub-mode.

In Steel Mode , the previously analyzed load cases are combined and used to determine their design status of steel members. Various design codes can be selected to perform code checks. The steel Mode is sub-divided in to Standard Steel Provisions e. The third mode, Drift Control allows you to investigate the relative participation of the various members with the structure related to the control of drift. The Steel mode and Drift Control modes are discussed in the following sections of this tutorial.

When the framing process is complete, a three dimensional wire-frame view of your model will appear on the screen. The RAM Frame program has a toolbar from which many commands can be issued with just a click of the mouse button. As with the other modules, this tutorial will present the commands as selected through the menus.

There are two pull-down lists in the second row of buttons than can be used to switch the program mode and sub-mode.

Frame analysis in staad pro manual download

They are also useful for checking the mode you are currently in. It also has a light to indicate the status of the current model. If the status indicator light is red, the model has not yet been analyzed.

A yellow light is used when the results are available, but may not be absolutely current due to a change in member size for example. The View menu has controls for displaying general model information such as finite element node numbers or to modify the rotation of the 3d view.

Disclaimer

To view the Wall Mesh for example:. Before performing the analysis you should always establish your criteria using the Criteria menu. To set the general analysis criteria:. By default, all floor levels are assumed to be Rigid diaphragms. A rigid diaphragm creates a horizontal constraint for all of the nodes connected to it.

For sloped levels, the diaphragm constraint is still horizontal. The size of the diaphragm is dictated by the extent of the slab edge. Since we entered the information for our Semirigid diaphragm in modeler, we will demonstrate now how that information is used. The Criteria - Ground Level command is used to specify the level at which the ground intersects the structure.

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The default is for the ground level to be at the base of the model. In this tutorial the default will be accepted and no changes need be made. When a level other than the base is selected as the ground level two things will happen.

First, the program generated loads will be adjusted for the new building height and the forces will be applied to the above ground levels only. Second, the ground level and any level below grade will be laterally restrained as if by a vertical roller. Redundancy factors are determined by the program and then used to modify the load factors applied to the seismic load cases in the generated load combinations.

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It's important to note that the redundancy factors always calculated for every seismic load case, even if your model is in an area of low seismic activity. They only apply to US codes. In order for the program to perform a Finite Element Analysis, every lateral member must have an assigned size. For our model, that was initially done in the Modeler, but the assign menu in RAM Frame can also be used to assign sizes to lateral members as we will illustrate below for braces we want to make Buckling Restrained Braces.

Buckling Restrained Braces require you to designate a section that is appropriate for the core yielding section of the Buckling Restrained Brace. In this model we will assign a solid rod to the bottom braces of the Frame along Grid F and a flat bar to the braces of the level above. This frame will become our Buckling Restrained Brace Frame.

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Obviously these braces are small and slender so to appropriately design we designate these as Buckling Restrained Braces. A variety of information, including the tension-only symbols, the member sizes, end fixity, etc. The assign menu commands can also use used to assign diaphragm connections, frame numbers, wall group numbers and foundations springs.

The load cases for which the structure is to be analyzed and designed must be defined.

Frame analysis in staad pro manual download

User defined and program generated load cases can be created. If the program is to automatically generate seismic load cases it requires information on the structure's mass properties, and for the program to generate wind loads, the building's dimensional properties are required.

Mass information is also used any time that second order analysis is performed. In this model all of the information required by the program to generate seismic and wind forces is already provided.

RAM Frame - Analysis Tutorial

If desired, this data can be overridden. Only the building extents affecting wind generated forces will be modified in this example. The extents that were determined by the program using the slab edges of the model are listed in the Building Extents portion of the window.

Frame analysis in staad pro manual download

To change those values:. The Parapet field is used to indicate the height of the parapet. If a parapet height is specified, additional wind loads will be attributed to that level. If there is another level above the level with a parapet, then the additional wind loads will only get applied to the portion of the lower level that is wider than the level above.

The Exposure column is used to indicate if a particular level does not resist wind loads at all. This might be the case if there is only a partial slab at that level such as in a mezzanine or stair landing between floors. By changing the exposure flag from Full to None a level is designated as having no exposure, and the wind force is distributed to the adjacent levels instead.

It's important to note that the program does not currently calculate wind uplift pressures. The program only calculates horizontal wind forces and applies them to the meshed nodes if the deck is meshed, and the magnitude of the force at the roof level is based on the height of the meshed surface.

Modifying the elevations of the columns has no direct impact on the horizontal wind force. For structures that are partially shielded or structures that have more than one windward and leeward face, the wind loads will have to be entered as User Defined Story Forces or Nodal Loads , rather than using the code generated lateral loads as done in the next section.

RAM Structural System Tutorial

This model already includes the gravity load cases created in the Modeler. These loads cannot be modified or deleted within the RAM Frame program. To define a Wind Load case:. The Wind dialog box should appear allowing you to define specific characteristics of the wind load:. In order to calculate the building frequency for Wind Load or period for seismic load the model must have rigid diaphragm levels with masses defined.

If diaphragm masses are zero the load case will not run. New load cases are now added to the Load Cases list box, one for each direction selected in the direction box. Some building codes require consideration of winds eccentric to the building.

This results in additional wind load cases. Since the wind load here was created with additional tension-only load cases, both the positive and negative direction load cases appear in the list. Also note that the program is set to use the calculated period, but if the calculated period should exceed the upper bound limitation of the code, that maximum period will be used.

The Eigen Solution dialog box should appear allowing you to define the number of periods you wish to generate.

Frame analysis in staad pro manual download

NOTE: When Semirigid diaphragms are generated the program has to calculate how many degrees of freedom the structure contains, then determine how many modes are associated with those degrees of freedom. For demonstration purposes use the number of floors times 6 here. A higher number may be needed for the code required participation, but this should be sufficient for this tutorial. NOTE: The center of rigidity load case has no options and does not affect the analysis at all, it simply allows you to review the center of stiffness graphically in the model.

If you need to edit any of the load cases you can select the load case in the Load List at the bottom of the Load cases window and click Change. When a load with multiple cases is selected, like wind load, the full set of loads will be edited together.

You have now defined all the load cases for which the frames will be analyzed. To start the analysis and display the Analyze dialog box:. The Analyze dialog box displays all the load cases available for analysis. Those load cases which are preceded by a green dot are available to be analyzed. A red light means that something is preventing that load case from being analyzed e.

In this example all load cases should be available. The analysis will commence and a status message box will keep you informed of the progress. Upon completion of the analysis, click [OK] and notice that the status indicator light on the status bar turns green if the self weight reactions of beams and columns are not current then he light will be yellow — see the RAM Manager documentation for a complete explanation on status lights.

This indicates that the structure has now been analyzed for each of the load cases selected, and analysis results can be viewed for each load case separately. If there is a stability problem with your model it will result in a warning during the analysis. Adjusting the member fixity can usually correct a stability problem.

Table of Contents

If there is too little stiffness in your structure, and the analysis is being performed with the P-Delta consideration, that might result in an excess P-Delta warning. You will see a message about the springs taking some of the lateral load. To see the report select Reports-Spring Forces. The results of the analysis of each load case can now be viewed either on-screen or in printed reports. In either case you can select the load case s for which you want results displayed.

If you have analyzed many load cases you may find your reports to be quite lengthy. The Reports — Select Cases command acts as an "Output Filter", allowing you to select which load cases will appear in the output.

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