Stability Analysis and Design in Staad (Part-1)|| PDelta , Buckling and Non Linear Analysis

[@Enfld1122]

Valuable information. Staad Pro has several types of analysis facilities available, like direct analysis, p-delta analysis,time history, response spectrum, blast analysis etc. Is there any " in-elastic non linear analysis" (simultaneously) available in staad pro? If yes, which methodologies does it follow for analyzing the structure? Kindly suggest any reference book name for referring manual calculation of "in-elastic non linear analysis".pls reply...

[@Torq123]

@@Enfld1122 STAAD doesn't have the feature to handle the material non linearity . The only inelastic rotational effect ( plastic rotation ) is considered for pushover analysis is for steel structures per FEMA guidelines ( non linear static analysis done for seismic evaluation) . Apart from that there are no extensive what you perform material inelastic analysis

[@Enfld1122]

@@Torq123 thanks for replying. It's okay that, staad pro doesn't have features of material non linearity. Does staad pro has feature/s of "GEOMETRIC NON-LINEARITY" & "CONTACT NON-LINEARITY" ? If yes, Which methodology does staad pro adopt for accounting the geometric & contact non-linearity?

[@Torq123]

@@Enfld1122 Yes STAAD does have GNL and to some extend boundary non linearity like compression only and tension only specs

[@Torq123]

@@Enfld1122 For GNL there are different types , PDelta effect is also a types of geometric non linearity. In addition to PDelta analysis STAAD does have rigorous Geometric Non Linear algorithm to capture several effects like Large deformation effect . Here the program solves the geometric non linear responses by the tangent matrix procedures. The applied load is divided into small units and sequentially applied . In every step the stiffness is updated due to the change in geometric shapes . On the other hand the Pdelta analysis is done by force vector iteration.

[@Enfld1122]

@@Torq123 Thank for replying. It has been observed that, there was several lackings/inabilities in staad pro regarding material non-linearity and contact non-linearity, which needs to be incorporated in staad pro for capturing appropriate effect of the same. Please suggest the parameters regarding material and contact non-linearities, so that it can be posted in "STAAD BRAND IDEA" tabs for implementation in advance version of staad.

[@azmat_waseem]

Very Informative... Thanks...

[@Subhajit-Structural-Er]

please try to cover up your contents with BIS code also

[@Subhajit-Structural-Er]

please upload all the webinar on demands on your youtube channel just like it.

[@Torq123]

Thanks you for your feedback ..

[@Torq123]

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[@Enfld1122]

For building like structures, p delta analysis, response spectrum analysis/linear or non linear time history analysis is used, but which analysis method should be adopted for non building structures like underground tanks and sumps, water treatment plant,sewage treatment plant etc.