• Title/Summary/Keyword: 내하율

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A Feasibility Study of Loading Test for Safety Assessment : Concrete Bridges (재하시험 수행에 관한 적정성 연구 : 콘크리트 교량)

  • Hwang, Jin Ha;An, Seoung Su;Kim, Ju Han
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.15 no.6
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    • pp.147-155
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    • 2011
  • The bridges where serious damages, defects, material degradations, etc. are not found can be presumed to have enough safety for the specified design loads, nevertheless, in many cases the loading carrying capacity is rated through loading tests. The safety specifications and manuals get no further than qualitative instructions for performing loading test or not. Some studies presented the improved appraisal methods for determining the load carrying capacity; however, the feasibility studies for loading test are scarcely carried out. This study examines an existing question, whether the loading tests are necessarily required in the safety assessment or not, and suggests an alternative for that via a statistical analysis for dozens of condition evaluation reports for concrete bridges.

A Study on Structural Safety Evaluation of Improved PSC Beam Bridges Considering To-Box Reinforcement Effect (박스형 보강효과를 고려한 개선된 PSC Beam교의 구조 안전성 평가에 관한 연구)

  • Han, Sung Ho;Shin, Jae Chul;Bang, Myung Seok
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.11 no.5
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    • pp.197-211
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    • 2007
  • The deteriorated PSC Beam bridge is necessary improved reinforcement method. In the study, it is proposed the box reinforcing method which could make the stiffness of the PSC Beam bridges increase more stably through the secondary composition effect of open type PSC Beam bridge's girder which is converted into the consolidation box type and the half panel is formed between the lower flange of the PSC Beam about the deteriorated PSC Beam bridge suffering the capacity decline. In case the proposed reinforcement method combine with the existed external prestressed method, the close analysis depending on the time is conducted by the construction stage because of searching the effect of reinforcement quantitatively. The reinforcement method of the box type which is proposed an efficiency improvement in objective in application case, by a reinforcement method after proposing the whole and bend sectional reinforcement method, against a each reinforcement method evaluated the upward camber which it follows in secondary composite effect and a member stress characteristics. Also, the structural safety of PSC Beam bridge is evaluated quantitatively by examining of rating factor through load carrying capacity evaluation.

Correlation Analysis between Safety Evaluation Indices and Load Carrying Capacity in Bridges (교량 안전성 평가 지표와 내하율의 상관관계 분석)

  • Kyu San Jung;Dong Woo Seo;Jae Hwan Kim;Kun Soo Kim;Ki Tae Park;Woo Jong Kim
    • Journal of Korean Society of Disaster and Security
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    • v.16 no.3
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    • pp.27-34
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    • 2023
  • In Korea, safety inspections of bridges are conducted periodically in accordance with law. Bridges are classified according to type, length, etdc., and the content and frequency of safety inspections are different. Bridges safety evaluation is performed on relatively large bridges, and safety evaluation of small bridges, which account for the majority of all bridges, is not mandatory. Therefore, in this study, in order to confirm the safety of small-scale bridges, a correlation analysis study was conducted with the common load carrying rate for each safety evaluation indicator. For this purpose, inspection reports of bridges from local goverments were collected, and the values for each bridges for about 50 indicators in the report were converted into data. By performing cleaning on the collected data and analyzing the correlation with the common load carrying rate, the top indicators related to safety for each bridges type were derived.