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  • Input ground-motion in free-field site response analysis

    Hello there, I am performing a free-field site response analysis. Plaxis's Manual suggests to set a " Compliant base " for the bottom boundary and " Free-field " for the lateral boundaries. Now, in my specific case i have an outcropping ground motion…

  • Subsea Seismic Analysis

    Hello community, I am enquiring about those who have performed seismic analysis on subsea pipelines or piping. I am wondering how others have handled the added mass component for the seismic analysis. It is unclear to me if AutoPIPE is calculating…

  • 30. Impossible to enter Ra, Rm, Tb, Tc, Td values in the earthquake window.

    Applies To Product(s): AutoPIPE Vessel Version(s): ALL Area: General Date Logged & Current Version August 2023 44.00.00.111 Problem: Impossible to enter Ra, Rm, Tb, Tc, Td values in the earthquake window.…

  • 02. How you define a Seismic load combination in AutoPIPE?

    Applies To Product(s): AutoPIPE Version(s): ALL; Area: Load case Date Logged & Current Version Aug 2023 23.00.00.230 Problem: How you define a Seismic load combination in AutoPIPE? Solution: To include the…

  • What will be the staged construction phases if an existing tunnel is modelled which is embedded into the soil under seismic loading?

    I have to model an existing tunnel and perform the analysis under seismic loading. What will be the phases for staged construction in PLAXIS 2D?

  • Does AutoPIPE make consideration for B31 piping code stresses with ASD vs LRFD?

    CAESAR II uses load reduction factors 0.7 for seismic events and 0.6 for wind events. https://docs.hexagonppm.com/r/en-US/CAESAR-II-Users-Guide-2019-Service-Pack-1/Version-2019-11.0-Service-Pack-1/888578 Would this be a valid way to incorporate?

  • Free field boundary conditions for PLAXIS 2D: new improvements and recommendations for practical use

    Application PLAXIS 2D Version PLAXIS CONNECT Edition V22 Update 2 PLAXIS 2D 2023.1 Date created 20 March 2023 Date modified 20 March 2023 Introduction One of the greatest challenges in dynamic finite element analysis…

  • 047. Do the horizontal seismic actions in AutoPIPE Vessel come from the full weight in case (+), and in case (-) come from a reduced weight? (reduced = 60% of weight)

    Answer: The simple answer is - full weight is NOT 60% of weight. Referencing model from SR provided by the user: " Heater _273_OF 43-9146_RC3 ". Run the file and generate the report. Now go to the case 11. The transverse reaction total…

  • What is the reason for designing of column without considering the worst load case even though I add several load combinations?

    In my model I analyze and design a G+8 RCC Structure, and the column is designed for only the first load case even though other load combinations give maximum axial force and moments. I attached the screenshots of output file below.

  • Simulation of Buckling of Bridge Braces — the San Francisco-Oakland Bay Bridge

    Simulation of Buckling of Bridge Braces - T he San Francisco-Oakland Bay Bridge The California Department of Transportation (Caltrans) initiated the California Toll Bridge Seismic Retrofit Program to determine the vulnerability of California's major…

  • Dam Safety in an Earthquake

    Dam Safety in an Earthquake An earthquake can cause a dam to crack or dislocate, or even cause its component blocks to detach. The damage can result in uncontrolled water release or a catastrophic flood. Numerical methods such as finite element analysis…

  • 16. Friction Pendulum System - Seismic Isolation - High Load Multi-Rotational Bearings

    For RM Bridge inside OpenBridge Designer , as shown in the pictures below, the Friction Pendulum System - FPS - is a support device that provides the structure with some level of Seismic Isolation , it is also known as High Load Multi-Rotational - HLMR…

  • RAM Frame and NBCC 2015 4.1.8.11 4)

    Hi, Based on NBCC 2015 4.1.8.11 4) single storey buildings with steel or wood deck as diaphragms can have a higher fundamental period compared to 4.1.8.11 3) as seen in the snap below. However, in the current RAM frame the Ta is only based on clause…

  • RAM Frame - Joint Shape Warning for Braced Frame

    I'm getting some conflicting graphical information and output. I'm designing a special concentrically braced frame (SCBF) with wide flange beams and columns and HSS braces. The frame column webs are oriented in the plane of the frame and all beam and…

  • Staad.PRO Seismic Response Spectrum (CQC)

    Hi. I am working on a steel structure and i have some issues with the seismic loads. That are the flexure MZ diagrams for the pure seismic load case in X direction (longitudinal). It caught my attention the results for the beam element marked in…

  • Dynamic analysis - Boundary Conditions

    Hi there, I am applying the earthquake time history as a prescribed displacement at the base of the model. The problem I am encountering when the strong shaking starts is that the side boundaries deform too much - see below. My lower boundary is a compliant…

  • Seismic Static Analysis Vertical Factor

    Where does the default value of 0.5 for vertical factor when performing adding static earthquake loads come from?

  • CHECK SOFT STOREY USING EUROCODE

    Hi, how to check soft storey using Eurocode in Staad.Pro (Response Spectrum)

  • Seismic Complete Quadratic Combination Force Summations

    Introduction You may have seen that the Dynamic Response force summations don’t match the Combined force summations in a seismic analysis. In this post I will describe why that is and show you how to replicate this in your own analyses. If we look…

  • Soil virtual anchor and seismic wave error.

    Hi, I have the following 4 warning that I unable to find any information about online. How would I go about addressing these warnings and do these warnings affect the static analysis? W2261-3: Invalid Pipe ID in "Virtual Anchor" data for following Soil…

  • 16. How to add a ASME B31E type combination into an ASME B31.3 piping analysis using AutoPIPE

    Applies To Product(s): AutoPIPE Version(s): ALL; Area: Calculations Date Logged & Current Version July 2022 12.08.01.010 Problem: User's scenario: The governing code for my project is ASME B31E (Standard…

  • 04. What is an Anchor Movement Analysis option in AutoPIPE's Batch reporter?

    Applies To Product(s): AutoPIPE Version(s): ALL; Area: Batch reporter Date Logged & Current Version June 2022 12.08.00.063 Problem: What is an Anchor Movement Analysis option in AutoPIPE's Batch reporter? …

  • Apply of LRFD Load Combination - ASCE/SEI 7-05

    Seismic load combinations are: 1.2D + 1.0E + L + 0.2S 0.9D + 1.0E + 1.6H While calculating the E loading, shall we do it for 1.0D + 1.0L OR based on the factors indicated in the mentioned combinations: 1.2D + 1.0L 0.9D **It is known that no…

  • Seismic Analysis - Moments Discrepancy

    Question: Discrepancy was found between the member forces plotted in the “MEMBER FORCES AND MOMENTS” table of the output listing file and the forces used for the member checks from the “Review/Redesign” dialog box in the Postvue data base directory…

  • Static seismic loading as per Eurocode

    Currently, STAAD.Pro only has options for generating Response spectra loads as per Eurocode. Users have requested to implement Eurocode for Static seismic cases as well.
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