ICONE11-36445 SEISMIC ANALYSIS OF A BURIED JACKET PIPING SYSTEM
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概要
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In the past, a complicated piping system under complex loading and boundary conditions may have to be simplified or decoupled to several simple models for analysis purpose. The results of those simplified analysis are generally approximate and very conservative. With the current advance of today's computer technology, a very detailed analysis using special features of a piping stress analysis program such as Bechtel Standard Program ME101 is feasible to provide more realistic results of such a complex pipe stress analysis problem. This paper presents the analysis methodology of such a complex pipe stress analysis problem - a buried jacket piping system connected between two buildings. The buried jacket piping system is a double containment piping consists of 3″ process piping and 6″ encasement piping. The 3″ processing piping is to transfer radioactive waste material from one building to another for processing. The 6″ encasement piping provides secondary containment in case of a leakage from the 3″ processing piping. One way weight supports, two way plate type guide supports and three way plate type guide supports with lugs are used between the process piping and encasement piping to support and control the 3″ process pipe movements. The 6″ encasement piping is anchored at the penetrations of the two building walls. The pipe mathematical model includes the process piping and encasement piping coupled together by those supports. Soil springs in vertical, lateral and axial direction of the pipe are developed to simulated the under ground condition. Based on this underground soil condition, the piping system is dynamically analyzed for seismic loads, and is statically analyzed for various temperature conditions, weight effects, seismic anchor movement and building settlement effects. The details of analysis and the results such as the interactions due to seismic motions and thermal expansions, soil interaction and the clearance are discussed and evaluated. The paper further compares the results of this analysis and the results of a simplified analysis based on the decoupled models. The final conclusions address the importance of the design parameters for this buried jacket piping system. A detail analysis and solution of this investigation will be discussed. With the results from this study, this paper further proposes a simple approach to decouple this type of analysis. Tables of summaries to facilitate various results and operating/event scenarios are included in this paper. The final conclusion addresses the importance of the critical design parameters for this buried jacket piping system.
- 一般社団法人日本機械学会の論文
著者
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Wong Kenneth
Bechtel Systems And Infrastructure Inc.
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Dong Milton
Bechtel Software Inc.
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Chern Chii
Bechtel Systems and Infrastructure Inc.