ASD 7.xx - Dlubal Software

Updated:

07/08/2010

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ASD 7.xx

Allowable Stress Design according to U.S. Standard AISC ASD (9th Edition)

ASD is the RSTAB add-on module for allowable stress design of steel structures. It includes the classification and the check of cross-sections with respect to the effectiveness of the section parts (local buckling). The analysis of axial, bending and shear stresses with the related interactions will be done in accordance with the stability analysis for bending and lateral torsional buckling. Also included is the design of plate girders and web-tapered members.
The design follows the guidelines of the "Manual of Steel Construction", 9th edition, from the American Institute of Steel Construction.
Working with the ASD module is almost identical with the other RSTAB modules and requires no additional training. The workflow is similar to the common design procedure that an engineer would do manually. Since the input is reduced to a minimum, the results can be quickly achieved.

Program Features

Classification of cross-sections for local buckling
Analysis of limiting stresses for tension, compression, bending, shear and torsion as well as the interaction of compression or tension with bending
Stability analysis for flexural and lateral torsional buckling
Special design of I-shaped web-tapered members
Design of slender plate girders
Special design of single angle sections respective to the comments in the Manual of Steel Construction
Spreadsheet and graphic input of the design parameters
Automatic analysis or manual input of the design coefficients Cm and Cb
Optimization of cross-sections
Personalized selection of any design details for inclusion in the global Printout Report
Library including U.S. materials
Specification of the governing internal forces
Parts list relative to members or sets of members
Metric and imperial units


Input Data input is done in spreadsheet-like tables. ASD automatically imports all members and cross-sections from the main program, RSTAB. In the first mask, the user defines which members and which load cases, load groups or load combinations are to be designed. You can select the load combinations and their safety factors which are actually set in RSTAB where different combination schemes can also be created and saved. The second mask manages the materials and cross-sections. Different materials may be used for alternative design. It is also possible to optimize cross-sections.


Analysis On the basis of given internal forces, ASD computes the most efficient section sizes (you only define the row of sections). In case of parametric sections, which are defined by entering the dimensions of flanges or webs, specific parameters like depth or thickness can be optimized. Any welded section may be optimized this way. The optimized sections may be returned to RSTAB for a new calculation run, taking into account the modified stiffness of the structure. Design parameters like Cb and Cm values are preset or may be computed from the end moments. Both the factors K for the effective lengths and the unbraced lengths are set to the member lengths by default.


Results and Output After the design, several result tables are presented. For each section and stress type, the member, x-location, stress point, decisive load case, existing and allowable stresses, and also the stress ratio are specified. On the right, the stress contours on the section are drawn. This picture also includes information about the stress points and the magnitude of the existing stresses. In a comment box, possible design problems or important details are explained. The results are also sorted by members, sets of members and x-location in further masks. A dialog to manage the desired output data ensures an optimal documentation. Any stress component can be manually recalculated since the design details are also listed. The parts list informs you about the various lengths used for each cross-section. Single and total weight are also computed so that a primary price estimation may be done. The graphic view is very important to evaluate the distribution of the stresses in the model. The stress ratio can be shown for each stress type (tension, compression, bending, shear, torsion, interaction of compression or tension with bending) on the members. Different colors are helpful to quickly locate overstressed areas even in large structures.


Mask 2.6 Governing Internal Forces	Stress Ratios: Graphic View in RSTAB

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You can find more information about ASD here:

	Flyer (PDF / 631 kB)
	Manual (PDF / 1.08 MB)
	Hotline
	Training

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