Computational Structural Engineering (전산구조공학)

Computational Structural Engineering Institute of Korea (한국전산구조공학회)
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Development of Stress Indices for Trunnion Pipe Support

원통형 배관 지지대의 응력계수 개발

  • Published : 1996.09.01
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Abstract

A finite element analysis of a trunnion pipe anchor is presented. The structure is analyzed for the case of internal pressure and moment loadings. The stress results are categorized into the average (membrance) and the linearly varying(bending) stresses through the thickness. The resulting stresses are interpreted per Section III of the ASME Boiler and Pressure Vessel Code from which the Primary (B/sub 1/) and Secondary(C/sub 1/) stress indices for pressure, the Primary(B/sub 2R/, B/sub 2T/) and Secondary(C/sub 2R/, C/sub 2T/) stress indices for moment are developed. Several analyses were performed for various structural geometries in order to obtain empirical representation for the stress indices in terms of dimensionless ratios.

배관을 구속시키기 위한 원통형 배관 지지대(Trunnion Pipe Support)가 부착된 배관의 응력해석을 위하여 유한요소해석을 사용하였다. 해석결과로 부터 얻어진 응력은 두께에 대한 평균(막응력) 및 선형 응력(굽힘응력)으로 분류되었으며, 분류된 응력값은 압력에 에 의한 일차응력계수(B/sub 1/)와 이차응력계수(C/sub 1/), 모멘트에 의한 일차응력계수(B/sub 28/, B/sub 2T/)와 이차응력계수(C/sub 28/, C/sub 2T/)를 추정하기 위하여 ASME Code에 정의된것과 일치하게 해석되었다. 무차원의 함수로써 응력계수에 대한 경험식을 개발하기 위하여 여러 모델의 해석을 수행하였다.

Keywords

References

  1. ASME Boiler and Pressure Vessel Code Nuclear Power Plant Components American Society of Mechanical Engineers
  2. Welding Research Council Bulletion 198 Secondary Stress Indices for Integral Attachments to Straight Pipe W. G. Dodge
  3. Welding Research Council Bulletion 198 Stress Indices at Lug Supports on Piping Systems E. C. Rodabaugh;W. G. Dodge;S. E. Moore
  4. ASME Journal of Pressure Vessel Technology v.104 no.2 Stress analysis and stress index development for a trunnion pipe support M. H. Sadd;R. R. Avent
  5. ASME Journal of Pressure Vessel Technology v.106 no.2 Development of B1 and C1 stress indices for trunnion elbow supports D. K. Williams;G. D. Lewis
  6. ASME PVP-Vol. 129 Stress indices for piping elbows with trunnion attachments for moment and axial loads R. F. Hankinson;L. A. Budlong;L. D. Albano
  7. ANSYS Engineering Analysis System User's Manual for Revision 5.1 Swanson Analysis System
  8. Applied Numerical Analysis(3th ed.) C. F. Gerald;P.O. Wheatley
  9. ASME Code Case N-391-1 Procedure for Evaluation of the Design of Hollow Circular Cross Section Welded Attachments on Class 1 Riping