• Can a metallic sheeting replace the bracings to resist the lateral forces - seismic forces and wind forces, to add stability of the structure?

    I have a slender structure, 5 m x 2.4 m of height 18 m. I wanted to replace the lateral bracings from level 6 m and above with the metallic sheeting, 6mm or more. I have added the plates of thickness 6mm to simulate the sheeting and by adding intermediate…

  • Importance Factor for Stability

    I'm operating in RAM Frame 16.01.00.20 In the stability coefficients parameters dialogue box, it won't let me alter the importance factor - it is set at 1 and grayed out. My seismic drift load cases are defined using an importance factor of 1.5 as I…

  • RAM Structural System and ASCE 7 Stability Coefficients

    I was checking the structural stability coefficients for a moment frame as recommended here: https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/6011/asce-7-aisc-360-and-the-direct-analysis-method-in-the-ram-structural…

  • Member Section Size affecting stability

    Does the member section affect the stability of a structure? I am working on a RAM Elements model that uses a cantilevered column lateral system and is fairly regular in shape. The model was running when I had the main beam size as a W8x21, however when…

  • Stability Issues in RAM Frame

    I'm modeling a performing arts center with BRBFs for the lateral system. When running the model in RAM Frame I've been getting errors about the model being unstable causing it not to run. I followed the steps listed in this link, http://communities.bentley…

  • RE: STADD.Pro V8i - Direct Analysis Method AISC 350-05 / 10

    The purpose of DIRECT ANALYSIS is to compute the member forces for strength design. For computing drifts, deflections you should use a PDELTA 15 ANALYSIS with the un-reduced stiffness and not a DIRECT ANALYSIS. Both analysis commands could be part of…

  • Arch becomes unstable with member offsets input STAAD

    I'm modelling a pinned arch, with varying section depth along the length of the arch. To account for eccentricity I'm adding offsets to the members. This causes the structure to become unstable for some reason. I've attached the .std file, simply star…

  • 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…

  • STAAD - Box Frame - Error in design

    Dear fellow users, I am trying to design in STAAD a BOX FRAME for a structure. This box frame has an intermediate (smaller) restraint beam which helps for stability. When running the analysis with the necessary loads, it seems that this intermediate beam…
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