소방시설 배관의 내진 안정성 재평가 : 써포트 유형에 따른 스프링클러설비 배관의 공학적 내진 해석 = Re-evaluation of Seismic Stability of Fire Protection Piping Systems

다국어 초록 (Multilingual Abstract)

In recent years, the increasing frequency of moderate to strong earthquakes has underscored the importance of ensuring the seismic stability of nonstructural components as well as structural systems. Fire protection piping systems play a critical role in preventing secondary disasters following earthquakes; however, damage to these systems can result in the loss of firefighting functionality and increased disaster risk. In Korea, seismic design criteria for fire protection systems were established relatively recently, and many existing sprinkler piping systems installed prior to these regulations remain in service without verified seismic performance.
This study aims to re-evaluate the seismic stability of sprinkler piping systems installed before the establishment of seismic design standards, with a focus on the influence of support configurations. The target structure is a reinforced concrete building with one basement level and three above-ground floors, equipped with a wet-type sprinkler system configured as a dead-end piping system. Seismic loads were calculated as equivalent static forces based on design spectral accelerations in accordance with the Korean Building Code (KBC) and ASCE/SEI 7-16.
Finite element analysis was conducted using Bentley AutoPIPE V12.3, and structural stability was evaluated in accordance with ASME B31.1 and ASME B31.9 piping codes. Three support configurations were considered: Case I (Rigid Hanger), Case II (Round U-Bolt), and Case III (Standard Guide). The results indicate that Case I exhibits seismic vulnerability by exceeding allowable stress limits, whereas Case II and Case III demonstrate stable behavior within allowable ranges. Additional analyses revealed that partial reinforcement of hanger-supported piping with U-bolts or guides significantly improves seismic performance.
The findings of this study quantitatively demonstrate that the seismic performance of existing fire protection piping systems is highly dependent on support configurations. Moreover, the results suggest that adequate seismic stability can be achieved through rational, engineering-based design without excessive seismic bracing. This study provides fundamental data for evaluating the seismic performance of existing fire protection piping systems and supports the development of performance-based seismic design and retrofit strategies.

Key words: Seismic Design, Nonstructural Components, Hanger, U-Bolt, Guide Support, Seismic Stability, Static Analysis, AutoPIPE, Seismic Load, Allowable Stress

목차 (Table of Contents)

• 목 차 ⅰ
• 표 목 차 ⅲ
• 그림목차 Ⅴ
• Ⅰ. 서 론 01
• 1.1 연구 배경 및 목적 01
• 1.1.1 연구 배경 01
• 1.1.2 연구 목적 04
• Ⅱ. 내진설계 이론적 배경 10
• 2.1 연도별 지진 발생 현황 10
• 2.2 응력 이론 11
• 2.3 정적 해석 14
• 2.4 국내·외 배관 내진설계 관련 기준 16
• 2.4.1 소방시설의 내진설계 기준 16
• 2.4.2 ASME B31.1 (Paragraph). 104.8.2 해석 25
• 2.4.3 ASME B31.9 (Paragraph). B-3.4 Design by Analysis 26
• Ⅲ. 본 론 28
• 3.1 해석 조건 및 모델링 28
• 3.2 배관 모델링 34
• Ⅳ. 연구 결과 및 비교·분석 44
• 4.1 정적해석 Piping Stress, Forec 및 Moment 결괏값 45
• 4.1.1 Case I 의 Piping Stress, Force 및 Moment 결괏값 45
• 4.1.2 Case II 의 Piping Stress, Force 및 Moment 결괏값 49
• 4.1.3 Case III 의 Piping Stress, Force 및 Moment 결괏값 53
• 4.2 결괏값 비교, 분석 57
• Ⅴ. 결 론 64
• 참 고 문 헌 66
• 영 문 초 록 68
• 감 사 의 글 70