• Title/Summary/Keyword: Fire-damaged concrete

Search Result 115, Processing Time 0.026 seconds

Behaviour of Concrete Building with High Temperature (콘크리트의 고온에서의 거동)

  • 이병곤;태순호
    • Journal of the Korean Society of Safety
    • /
    • v.12 no.2
    • /
    • pp.140-145
    • /
    • 1997
  • The main purpose of this study is to establish the reliable method for evaluating fire damage of reinforced concrete building, by using the rational procedure, and to develope the rehabilitation methods of fire damaged concrete structures. Especially, this proposed evaluation method is applied to the fire damaged concrete buildings of domestic, and the rehabilitation methods on the basis of these applied results are proposed and those example are shown. The proposed rational evaluation method for fire damaged concrete building proceeds is estimating the reduction of the mechanical properties of concrete of fire damaged structural members in comparison with the experimental results which are obtained from the compression tests of heated concrete specimens under various temperatures.

  • PDF

Structural Behavior of Fire-Damaged Reinforced Columns with $P-\Delta$ Effect ($P-{\Delta}$ 영향을 화해를 입은 기둥의 거동)

  • Lee, CHa-Don;Lee, Hang-Eun
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2004.05a
    • /
    • pp.514-519
    • /
    • 2004
  • The paper discusses the general behavior of fire-damaged slender reinforced concrete columns on the basis of results obtained from parametric studies. Effects of slenderness ratio, concrete strength, cover thickness, reinforcement ratios, exposed time to fire, and eccentricity on the ultimate capacity of fire-damaged column are theoretically observed. With the increase of slenderness ratio, similar tendency of relative strength reduction was observed between fire-damaged columns and columns at room temperature.

  • PDF

Fire Resistant Performance after Application of Repaired Materials for Fire-Damaged Reinforced Concrete Column (화재피해를 입은 철근콘크리트 단주시험체의 보수재료 적용 후 내화성능 평가)

  • Sim, Sang-Rak;Ryu, Dong-Woo
    • Journal of the Architectural Institute of Korea Structure & Construction
    • /
    • v.36 no.5
    • /
    • pp.147-154
    • /
    • 2020
  • Currently, there are no specific repair methods for RC structures damaged by fire, and repair methods are applied when durability deteriorates due to aging. In addition, a number of recent studies have been reported that have conducted fire resistance assessment of the repair materials themselves, assuming exposure to high-temperature environments such as fires. However, researches that evaluate the fire resistance performance of the repair materials by applying existing repair materials to the actual fire damaged reinforced concrete structures are very rare. Therefore, in this study, a number of existing repair materials were applied to fire-damaged concrete column to compare and evaluate the fire resistance performance with the original cover concrete.

Non destructive test of Fire-damaged reinforced concreted beams with high strength concrete (화재 피해를 입은 고 강도 철근콘크리트 휨 부재의 비파괴 검사)

  • 신미경;신영수;이차돈;홍성걸;김희선
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2003.11a
    • /
    • pp.651-654
    • /
    • 2003
  • Non-destructive testing is essential in the inspection of alteration, repair and new construction in construction industry. This paper is to evaluate the strength variation of fire damaged concrete by non-destructive testing. Furthermore, It is to infer the recovery degree of residual strength of fire-damaged concrete. For this purpose, researchers are exploring the performance of non-destructive testing method using ultrasonic testing and Schmidt hammer in concrete specimens. Testing is performed four-times: before fire test, directly after fire test, after 20 days and after 60 days.

  • PDF

Deterioration of Structural Capacity of Fire-Damaged Reinforced Concrete Column (화해를 입은 철근콘크리트 기둥의 구조성능 저하)

  • 이차돈;신영수;홍성걸;이승환
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2003.11a
    • /
    • pp.371-374
    • /
    • 2003
  • The degree of changes in mechanical properties of fire-damaged reinforced concrete column depends mostly on sectional geometry, duration exposed to fire, and moisture containment. In order to reasonably assess the deterioration of structural capacity of fire-damaged reinforced concrete column, it is necessary to develop a theoretical model predicting column behavior based on nonlinear heat transfer equation in addition to the traditional mechanics. This research focuses on the development of theoretical model to predict moment-curvature relations of fire-damaged reinforced column. The model is used for the assessment of structural capacity of fire-damaged column in terms of moment-curvature relations and PM interaction curves.

  • PDF

Strength Evaluation of Fire-Damaged High Strength Concrete by Non-Destructive Tests (비파괴방법에 의한 화해를 입은 고강도 콘크리트의 강도추정)

  • Kim Hee Sun;Park Jae Young;Choi Eun Gyu;Shin Yeong-Soo
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2004.05a
    • /
    • pp.392-395
    • /
    • 2004
  • When a concrete member is damaged by fire accident, it can lose its strength. And the degradation rate of losing its strength affected by many environmental conditions. But there is few research for equation for strength evaluation of fire-damaged concrete. Besides, it is impossible to destruct structural member from the building for the evaluation. So, I will suggest a new equation for strength evaluation of fire-damaged RC beam using non-destructive test. For this purpose, the researchers are exploring the performance of non-destructive testing methods using Ultrasonic test, Schmidt Hammer test and Coring test against fire damaged concrete specimen.

  • PDF

Evaluation of Material Properties of Fire-damaged Concrete Under Post-fire Curing Regimes Using Impact Resonance Vibration Method (충격 공진 기법을 이용한 화재 손상 콘크리트의 재양생 조건별 재료물성 평가)

  • Park, Sun-Jong;Yim, Hong Jae
    • Journal of the Korea institute for structural maintenance and inspection
    • /
    • v.21 no.5
    • /
    • pp.42-48
    • /
    • 2017
  • When concrete structures expose to fire, the structures were damaged accompanied with degradation of material properties of concrete. In order to determine the reuse of fire-damaged concrete structures, it is needed a careful determination considering conditions of fire damage, such as exposure temperature and exposure time, and also potential to restore fire damage. This study investigates on the evaluation of residual material properties of fire-damaged concrete under different post-fire curing regimes. An experimental study was performed on concrete samples to measure the dynamic elastic modulus by the impact resonance vibration method. Upon the experimental results, the evidence of restoration of material properties was confirmed on specific post-fire curing regimes, higher humidity conditions. Additionally, a correlation analysis was performed on the dynamic elastic modulus with the tensile strength for identifying the effects of post-fire curing regimes on both material properties of fire-damaged concrete.

Applicability of Impact-Echo Method for Assessment of Residual Strength of Fire-Damaged Concrete (화해된 콘크리트의 잔존 강도 평가에 있어서 충격-반향 기법의 적용성)

  • Shin, Sung-Woo;Kim, Seung-Yong;Kim, Jeong-Su
    • Journal of the Korea institute for structural maintenance and inspection
    • /
    • v.17 no.5
    • /
    • pp.105-112
    • /
    • 2013
  • In this study, the applicability of impact-echo method for assessment of residual strength of fire-damaged concrete is investigated. A series of standard fire test is performed to obtain fire-damaged concrete specimens. Impact-echo tests are executed on the specimens and the responses are analyzed. Compressive strengths of the fire-damaged concrete are evaluated and correlated with the ultrasonic wave velocities determined from the impact-echo responses. The effectiveness of impact-echo based ultrasonic wave velocity measurement for assessment of residual strength of fire-damaged concrete is discussed.

Non destructive test of fire-damaged high strength RC columns with polypropylene fiber (화재피해를 입은 PP섬유 혼입 고강도 콘크리트부재의 비파괴 검사)

  • Jung, Hye-Won;Choi, Eun-Gyu;Shin, Yeong-Soo;Lee, Cha-Don;Kwon, Young-Jin
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2006.11a
    • /
    • pp.65-68
    • /
    • 2006
  • This study is aimed to investigate the strength variation of fire-damaged reinforced concrete column with polypropylene by non-destructive test. It is studied to infer the recovery degree of residual strength of fire-damaged concrete. For measuring the surface hardness of RC columns, Schmidt hammer test is used. Testing is performed four-times: before fire test, directly after fire test, after 30 days and after 4 months.

  • PDF

Numerical Study on the Fire Damaged Reinforced Concrete Building Structures Considering Influencing Fire Case and Parameters of Columns (화재피해를 받은 철근콘크리트 건축물의 기둥의 영향인자를 고려한 해석적 연구)

  • Suh, Yeonwoo;Son, Hee Ju
    • Journal of the Korean Society of Safety
    • /
    • v.37 no.4
    • /
    • pp.101-112
    • /
    • 2022
  • Expanding urbanization practices result in high numbers of buildings being developed in city centers. This high building concentration leads to an increased fire risk, resulting in higher casualty rates and increased economic damages compared to fires in the past. The purpose of this study was to analyze the structural behavior of fire-damaged reinforced concrete buildings using analytical methods and to suggest methods of improving fire resistance in the event of a fire. Damage levels were measured using commercial software to apply the finite element method, ABAQUS, and MIDAS GEN to the dataset. Load-deflection curves were calculated using the effective area and moment of inertia of the fire-damaged columns provided by ABAQUS. The results of this analysis indicate that fire-damaged beams with experience greater deflection from indoor fires than they will from outdoor fires. Fires that occurred on the middle floors were more dangerous than those occurring on higher floors, and eccentrically loaded columns experienced more damage than axially loaded columns. The results indicate that these methods accurately predict structural behaviors of fire damaged concrete columns by considering fire exposure area and eccentric loading.