적재설비 안정성 확보를 위한 FE 해석 기반의 연결부 모델 개발 = Development of Connection Model based on FE Analysis to Ensure Stability of Steel Storage Racks

다국어 초록 (Multilingual Abstract)

This paper attempts to develop a connection model based on FE analysis that can be applied to the evaluation of earthquake fragility of Steel Storage Racks lacking research in Korea. In order to accomplish this goal, shaking table tests, modal tests, and various member tests (8 case, push-over test) for structural members have been conducted to understand the behavior of steel storage racks. Based on the experimental results, detailed modeling of the joints was conducted using the NX-Nastran program in order to develop a connection model for Steel storage racks to be applied to the seismic vulnerability assessment. Especially, surface to surface contact element and spring element are applied to simulate the connection between the column member and the beam member connected by the simple latch method. Spring element model developed and applied ARX (Auto Regressive eXogenous) based mathematical model. The simulationresults based on the FE model showed excellent reliability with a mutual error rate of less than 8% when compared with the member test results. As a result, it was confirmed that the FE model based connection model developed in the study can be applied to the analytical model for the seismic vulnerability assessment of Steel storage racks.

국문 초록 (Abstract)

본 논문은 국내에서 연구가 미진한 적재설비의 지진 취약도 평가에 적용할 수 있는 FE 해석 기반의 연결부 모델을 개발하는데 목적이 있다. 이러한 목표를 달성하기 위하여, 적재설비 거동을 파악하기 위한 진동대 실험과 Modal Test, 그리고 구성 부재를 대상으로 한 다양한 부재실험(8가지 Push-over Test)을 진행하였다. 실험결과를 바탕으로 지진취약도 평가에 적용하기 위한 적재설비의 연결부 모델을 개발하기 위하여, NX-Nastran 프로그램을 활용하여 연결부의 상세 모델링을 진행하였다. 특히, 단순 걸쇠 방식으로 연결되는 기둥 부재와 보 부재의 연결을 모사하기 위하여 면대면 표면접촉 요소와 스프링 요소를 적용하였으며, 스프링 요소의 모델은 ARX (Auto Regressive eXogenous) 기반의 수학적 모델을 개발하여 적용하였다. FE 모델 기반의 simulation 결과는 부재 실험 결과와 비교하였을 때, 상호 오차율 8% 미만의 우수한 신뢰도를 보여주었다. 결과적으로 연구에서 개발한 FE해석 기반의 연결부 모델은 적재설비의 지진 취약도 평가를 위한 해석 모델에 활용될 수 있음을 확인하였다.

참고문헌 (Reference)

1 International Conference of Building Officials, "Uniform building code (UBC), 1976 EDITION"

2 European Racking Federation, "The seismic design of static steel pallet racks, FEM 10.2.02"

3 Australian Standard, "Steel storage racking, AS4084-2012"

4 BSSC Storage Rack Project Task Group, "Seismic considerations for steel storage racks located in areas accessible to the public, FEMA 460" Building Seismic Safety Council for the Federal Emergency Management Agency 2005

5 Tajjudin, N., "Model predictive control using ARX model for steam distillation essential oil extraction system" Institute of Electrical and Electronics Engineers 2010

6 Abba, M. A., "Investigation of seismic behaviour of steel pallet rack frames" 2 (2): 13-19, 2017

7 Rack Manufacturers Institute, "American national standard specification for design testing, and utilisation of industrial steel storage racks, ANSI: MH 16.1-2012"

8 Rack Manufacturers Institute, "American national standard specification for design testing, and utilisation of industrial steel storage racks, ANSI: MH 16.1-1974"

9 International Code Council, "Acceptance criteria for seismic certification by shake-table testing of nonstructural components, ICC-ES AC156"