• STAAD - Change material after analysis for service check

    According to application notes by AISC, for Direct Analysis Method the UNREDUCED STIFFNESS shall be used for service checks. Now, due to limitations by Staad for DAM (for instance, not TENSION MEMBER available), I proceed to: 1. Reduce module of elasticity…

  • Design of Solid slab (Conventional slabs)

    Hello Everyone For a while, I was using an Advanced Concrete Design (RCDC) for the design of a solid slab. Today I tried to learn the RAM concept for the slab designs but I saw a design of strips that had never seen before (When I was using RCDC and…

  • RCDC Detailing Failure

    How to rectify this failure known as 'Detailing failure' in RCDC

  • How to Modify Notional Load Factor Applied to Auto Generated Load Combinations in STAAD.Pro Connect Edition?

    The default notional load factor applied to gravity loads when using the automatic load combination generator is 0.002. Is it possible to automatically generate load combinations in the most recent version of STAAD with a notional load factor other than…

  • "Bentley.Staad not responding" when using notional loads for Direct Analysis

    I am using STAAD Connect version 21.00.02.43. I have been trying to create a staad file for direct analysis with notional loads.However, when opening the file as indicated in the image, the software stops responding. This does not happen when removing…

  • What is the difference between ITERDIRECT and PDITER options for PERFORM DIRECT ANALYSIS command?

    My understanding is that with the PDITER command with every PDelta Iteration the Taub values for Direct analysis is computed and the iteration stops when Taub converges. In which case I cannot understand the purpose of the ITERDIRECT command. Could…

  • Seismic load by applying notional load

    Hello, I am trying to use notional loads(ASCE7-05 Section 11.7.2) as seismic load that's why the building is assigned to Seismic Design Category A. And I will use direct analysis method when designing the building as well. I wonder there is no…

  • RE: Notion load factor for 0.002 or 0.003

    Regarding 1, in Direct Analysis the Taub values are determined iteratively based on the axial force in the member. When you set the notional load factor to 0.003 these iterations are not carried out and Taub is considered as 1 which is what the code recommends…

  • RE: Blast analysis using Direct analysis method

    It would not be appropriate to do a direct analysis with a time history loading. Instead what you can do is a Direct analysis for all other cases and then analyze the time history loading using a PDELTA KG. That accounts for the pdelta effects in the…

  • RE: Divergent in load cases

    The MX releases for the members 81 and 475 were taken out as shown next *81 START MX MY MZ *475 END MX MY MZ 81 START MY MZ 475 END MY MZ The following code commands were redundant and were commented out *PARAMETER 2 *CODE AISC A modified…

  • RE: Tension members in Staad

    Gilbert : As of now, STAAD.Pro does not allow Tension/Compression members to be used in a DIRECT ANALYSIS. If TENSION/COMPRESSION is assigned, these attributes are turned off and the members are simply treated as TRUSS members which can take both tension…

  • RE: Steel & Concrete Load Combinations & Analysis

    Using the two analysis types as part of the same analysis model should be fine. I verified it with the attached example. Direct_Analysis_Steel_and_Concrete_Model.std

  • RE: STAAD Direct Analysis Method FLEX and AXIAL Parameters

    While taking a look at the model, I noted a few points Point 1 The error was stemming from the fact that MY MZ releases were applied to these members in addition to the TRUSS specification. So you need to change the MEMBER RELEASE as shown next …

  • STAAD.Pro Interactive LEARN Session: Direct Analysis and AISC 360 Specifications

    Hi everyone. It is my pleasure to welcome you to this Interactive Learn Session to discuss about your queries related to Direct Analysis as per AISC 360 specifications and how to do it in STAAD.pro. This would be a great opportunity for all to share ideas…

  • RE: STAAD.Pro Interactive LEARN Session: Direct Analysis and AISC 360 Specifications

    During the SIG session this morning someone was asking about the Tau-b reporting. Just wanted to mention that information on Tau-b are printed as part of the analysis output file. If such messages are not required to be printed, one can turn those off…

  • STAAD.Pro Interactive LEARN Session: Direct Analysis and AISC 360 Specifications – April 23

    Are you running into problems while carrying out Direct Analysis for AISC 360 using STAAD.Pro? Don’t worry, I’m here to help! Join me LIVE for an Interactive LEARN Session on April 23 from 2 :00 p.m.-6:00 p.m. ET in the Structural Analysis and Design…

  • RE: Ram Frame Pnt > Pe2x errors

    There might not be anything wrong with your model, this just happens under some circumstances. There is a fairly lengthy explanation of how this check is performed in the manual Section 3.2.1 AISC 360 (ASD and LRFD) and beyond, and I see you’ve already…

  • Re: Tech Reference Manual section 5.37.5

    So as to be of a little more immediate help to your question regarding using the Direct Analysis: 5.37.5 DIRECT Analysis (Available effective STAAD.Pro 2007 Build 03) General format: PERFORM DIRECT ANALYSIS ( {LRFD or ASD} TAUtol f1…

  • Re: DIRECT ANALYSIS AISC 360-10

    Exactly, the displacement i have compared are the nodal displacement to check the drift of the structure. Is it possible to get the displacement of the nodes with full EI after analysis to check the serviceability (drift) limits, i believe that the reduced…

  • RAM Concept Moment Diagrams

    Good morning, I have a query in regards to the moment plans that are generated for Mx and My. Are the values that are shown for the whole design strip, or are they per m? The reason I ask is that I am comparing the results to those from the same…

  • Re: DIRECT ANALYSIS AISC 360-10

    While using the REDUCEDEI 1 or 0, there is no change in the deflection values (i.e. getting the same deflection values while running with REDUCEDEI 0 or 1 ), please advice (may i assume that the deflections are calculated with full EI in all the cases…

  • Re: Direct Analysis Method Screencast

    Hi Bendog, You can view that screencast and others on the Bentley Structural Team blog. Here's a direct link to the STAAD.Pro Direct Analysis screencast. Be sure to keep coming back to Be Communities for the latest content and help from your peers…

  • DAM with Tension-only members

    Are there any plans to revise STAAD so that it will be able to use the direct analysis method (DAM) on stuctures with tension-only members? In the mean time, does anyone have a suggestion on how the direct analysis method could be simulated on structures…

  • DIRECT METHOD ANALYSIS - GENERAL

    I'm trying to crosscheck a AISC design example regarding the DIRECT METHOD ANALYSIS. My problem is that, if I check the moments and the displacements obtained by the Staad Model, I cannot get the same results given in the example. Could anybody…

  • Re: DIRECT ANALYSIS AISC 360-10

    I am getting the same displacement by changing the REDUCEDEI also, please refer to the below and advice, The displacement results shows that the full EI is used for calculating the deflections? please advice The below results with command, PERFORM…
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