Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Modeling Subarea: Original Author: Bentley Technical Support Group Seismic Analysis with AutoPIPE: There are 4 different types of seismic analysis which can be performed. Simplified Static seismic analysis … up to 10 cases (ie. E1..E10). Furthermore, user can add additional Member & Point Static Earthquake Factors (Insert Xtra Data ) which can be applied across any section of piping to simulate different seismic g at different building floors or supported structures Response spectrum analysis applied to complete piping system (Load Dynamic Analysis Response Spectrum tab. Multiple support response spectrum analysis or independent support motion is more accurate analysis and common in nuclear piping design. This will capture response of independent spectrums e.g. at ground and different floor levels applied to groups of pipe supports supported on these levels. See tutorial AutoPIPE_MSRS_Example1.pdf. Time history analysis with ground motion option turned on (Load Dynamic Time History Tab Ground motion enabled). Note: see AutoPIPE's online help for details on each of the items mentioned above. Item #1: I would like to know if Autopipe calculates according to the EN 1998 codes which is needed for Bulgaria? or can I convert information between codes. please let me know since this is critical for the approval for the engineering. Answer: AutoPIPE is able to model various Seismic Earthquake loads as mentioned above. With regards to the Static Seismic analysis feature, AutoPIPE V8i 09.06.00.xx has 5 different codes available: ALA (ASCE 2002) ASCE (2010) GB50011 - 2001 Mexican CFE 2008 User As seen above, En1998 code is not a selection. However, the user can get the code values from another resource and enter them in as a "User" code type. See AutoPIPE online help for details on this feature. The following enhancement has been logged ( TFS-E97721: Add new Seismic code, EN 1998) to add this new seismic code to a future version of AutoPIPE. Item #2: Can we apply a 3-dimensional earthquake combination? some believe that enveloping two planar earthquake combinations (X/Y and Y/Z) is still two dimensional. Answer: This again goes back to what is the requirement that is laid down by the standard which the user's are following. For example, look at the following diagram from our online help for JSME 2008: For JSME 2008, AutoPIPE provides the option to "apply all three directions at the same time", which can be checked or unchecked. You can see that for the dynamic seismic analysis it is considering R1, R2, and R3 (all three directions) to reach a D1xyz (dynamic in x, y, and z direction). However, you can also see that for static analysis, x combined with vertical y and z combined with vertical y. Now these requirements are derived from JSME 2008. Whatever project the user is working on, he should refer to what are the requirements laid down by the standard that they want to follow. See Also Bentley AutoPIPE External Links Bentley Technical Support KnowledgeBase Bentley LEARN Server Comments or Corrections? Bentley's Technical Support Group requests that you please submit any comments you have on this Wiki article to the "Comments" area below. THANK YOU!S
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