A Study on the Static Behavior of a Temporary Bridge using the Preflex Method

doi:10.15683/kosdi.2026.3.31.048

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2026 Vol.22, Issue 1 Preview Page Next Page

Original Article

A Study on the Static Behavior of a Temporary Bridge using the Preflex Method 프리플렉션 방식을 이용한 가설교량 정적 거동 연구: 백진호¹ㆍ장현옥²ㆍ정병목³ㆍ김성겸⁴*
Jinho Baek¹, Hyunock Jang², Byungmok Jung³, Seong-Kyum Kim⁴*; ¹Ph.D. Student, Department of Civil Engineering, Kumoh National Institute of Technology, Gumi, Republic of Korea
²CEO, J Engineering and Construction Co., Ltd., Suwon, Republic of Korea
³Manager, R&D Center, Buil Construction Co., Ltd., Gunsan, Republic of Korea
⁴Associate Professor, School of Architecture, Civil and Environmental Engineering, Kumoh National Institute of Technology, Gumi, Republic of Korea

31 March 2026. pp. 48-61

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Abstract

Purpose: This study verified that the static behavior of a preflex type temporary bridge using the results of a numerical analysis method and load test of a full-scale specimen. Method: Based on the preliminary design by exact solution and numerical analysis method, preflex type specimen 1 and reinforced cross-section specimen 2 were manufactured and loading tests were performed. Result: The deflections of prestressing girders confirmed its integrity with a behavior of 97.7 to 100.0% compared to the theoretical deflection, the deflections of the 4 point loading test was 105 to 106.0% of the deflection of the exact solution and specimen 1 was found to have 6.0 to 34.5% more capacity of nominal stress than specimen 2. Conclusion: Compared to reinforced cross-section girder bridges, preflex type temporary bridges have a capacity of nominal stress. Therefore, preflex type temporary bridges have been proven to enhance engineering design efficiency.

Keywords

Preflex Type Temporary Bridges

Reinforced Section

Full-Scale Specimen

Static Loading Test

Residual Stress

연구목적: 본 연구는 프리플렉스 방식 가설교량의 정적거동특성을 수치해석적인 방법과 실대형 실험체의 하중재하실험결과로써 비교검증 하고자 한다. 연구방법: 이론적 정해 및 수치해석 방법에 의한 예비설계를 기반으로 프리플렉스 방식 실험체 1과 보강단면 실험체 2를 제작하고 재하실험을 수행하였다. 연구결과: 프리플렉션 도입 거더는 정해의 처짐 대비 97.7~100.0%의 거동으로 일체성을 확인하였고, 4점 재하 실험의 처짐은 정해 대비 105~106.0% 발생하였으며 실험체 1은 실험체 2 대비 6.0~34.5%의 여용력을 확보한 것으로 나타났다. 결론: 보강단면 가설교량에 대한 프리플렉스 방식 가설교량은 단면 작용응력의 여용력을 확보함으로써 공학적 설계의 효율도를 향상시킨 거더임을 검증하였다.

키워드

프리플렉스 방식 가설교량

가설교량

실대형 실험체

정적 하중 재하 실험

프리플렉스 잔류응력

여용력

References

Choi, B-.H., Kim, T.-B., Park, S.-K. (2017). “Flexural performance of multistage prestressed and self-weight preflex girder.” Journal of Korean Society of Steel Construction, Vol. 29, No. 4, pp. 311-321. 10.7781/KJOSS.2017.29.4.311
Choi, G.-Y. (2025). A Study on the Reinforcement for Support Point of Preflex Girders with Variable Cross Sections. Ph.D. Dissertation, Joongbu University.
Choi, K.-Y. (2013). Development of Preflex Composite Girder using Composite of Temporary Beam, Master Thesis, Kyung Hee University.
Korea Construction Standard Center (2019). KDS 24 14 30.
Korean Agency for Technology and Standards (2018). KS D 3515 Rolled Steels for Welded Structure.
Lee, J.-W., Ha, T.-Y., Yang,I.-W., Han, J.-W. (2016). “An experimental study on structural behavior of segmental joint in prestressed composite girder.” Journal of the Society of Disaster Information, Vol. 12, No. 4, pp. 422-431. 10.15683/kosdi.2016.12.31.422
Sim, J.-H., Park, J.-U., Park, K.-H. (2009). “Effect of load carrying capacity with method of application of prestress on long-span temporary bridges.” Journal of the Korea Academia-Industrial Cooperation Society, Vol. 10, No. 6, pp. 1275-1280. 10.5762/KAIS.2009.10.6.1275
WonGiSul Publishing Co. (2011), Temporary Structure Planning and Design. Seoul, Korea

Information

Publisher :The Korean Society of Disaster Information
Publisher(Ko) :한국재난정보학회
Journal Title :Journal of the Society of Disaster Information
Journal Title(Ko) :한국재난정보학회논문집
Volume : 22
No :1
Pages :48-61
DOI :https://doi.org/10.15683/kosdi.2026.3.31.048

[1] Choi, B-.H., Kim, T.-B., Park, S.-K. (2017). “Flexural performance of multistage prestressed and self-weight preflex girder.” Journal of Korean Society of Steel Construction, Vol. 29, No. 4, pp. 311-321. 10.7781/KJOSS.2017.29.4.311

[2] Choi, G.-Y. (2025). A Study on the Reinforcement for Support Point of Preflex Girders with Variable Cross Sections. Ph.D. Dissertation, Joongbu University.

[3] Choi, K.-Y. (2013). Development of Preflex Composite Girder using Composite of Temporary Beam, Master Thesis, Kyung Hee University.

[4] Korea Construction Standard Center (2019). KDS 24 14 30.

[5] Korean Agency for Technology and Standards (2018). KS D 3515 Rolled Steels for Welded Structure.

[6] Lee, J.-W., Ha, T.-Y., Yang,I.-W., Han, J.-W. (2016). “An experimental study on structural behavior of segmental joint in prestressed composite girder.” Journal of the Society of Disaster Information, Vol. 12, No. 4, pp. 422-431. 10.15683/kosdi.2016.12.31.422

[7] Sim, J.-H., Park, J.-U., Park, K.-H. (2009). “Effect of load carrying capacity with method of application of prestress on long-span temporary bridges.” Journal of the Korea Academia-Industrial Cooperation Society, Vol. 10, No. 6, pp. 1275-1280. 10.5762/KAIS.2009.10.6.1275

[8] WonGiSul Publishing Co. (2011), Temporary Structure Planning and Design. Seoul, Korea

Journal of the Society of Disaster Information ISSN:1976-2208(Print) 2671-5287(Online) 한국재난정보학회논문집

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