• 제목/요약/키워드: piloti

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KDS 41 17 00에 따라 설계된 저층 필로티 건물의 지진 취약도 (Seismic Fragility of Low-rise Piloti Buildings Designed According to KDS 41 17 00)

  • 주창혁;김태완
    • 한국지진공학회논문집
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    • 제26권2호
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    • pp.49-58
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    • 2022
  • The 2017 Pohang earthquake caused severe damage to low-rise piloti buildings. The damage was caused mainly by column shear failure, and some core walls were as well. The damaged piloti buildings in Pohang City could be relieved if they were designed correctly according to the standards at that time. However, the post-earthquake investigation revealed design, construction, and permission problems. To solve the problems, the Piloti Building Structure Design Guidelines that include strict specifications were published in 2018. Separately, KDS 41 17 00, the seismic design standard for buildings, was enacted in 2019 and it included the guideline contents. Therefore, at least after the publication of the guidelines, piloti buildings, designed by the standard and guidelines, can be expected to possess better seismic performance than existing piloti buildings. To confirm this, the probability of exceedance for several damage state thresholds was estimated for existing and designed piloti buildings. As a result, the probability of damage of designed piloti buildings was very low compared to existing ones. Consequently, it was confirmed that the guideline and standard adequately supplement the structural fragility of existing piloti buildings.

중심코어를 가지는 저층 철근콘크리트 필로티 건물의 내진성능 (Seismic Performance of Low-rise Piloti RC Buildings with Concentric Core)

  • 윤태호
    • 한국산업융합학회 논문집
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    • 제25권4_2호
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    • pp.611-619
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    • 2022
  • In this study, the seismic performance of low - rise piloti buildings with concentric core (shear wall) position is analysed and reviewed based on KDS 41. The prototype is selected among the constructed low - rise piloti buildings with concentric core designed based on KBC 2005 which was used for many low - rise piloti buildings construction. The seismic performance of the building shows plastic behavior in X-direction and elastic behavior in Y-direction. The inter-story drift is lager than that of concentric core case and is under the maximum allowed drift ratio. The displacement ratio of first story is much lager the that of upper stories, and the frame structure in the first story is evaluated as vulnerable to lateral force. Therefore, low - rise piloti buildings with concentric core need the diminishment of lateral displacement and reinforcement of lateral resistance capacity in seismic design and seismic retrofit.

지진하중이 작용하는 RC 필로티 건축물의 동적해석 (Dynamic Analysis of RC Piloti-Type Building Subjected to Earthquake Loads)

  • 김주원
    • 한국전산구조공학회논문집
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    • 제34권3호
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    • pp.121-128
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    • 2021
  • 본 연구에서는 비틀림비정형성과 수직비정형성을 가진 RC 필로티 건축물의 지진동에 대한 거동을 층강성을 적용하여 간단하게 모델링하는 선형 동적해석 프로그램을 개발하고자 한다. 개발된 동적 해석 프로그램을 적용하여 필로티 건축물의 동적 거동 및 필로티층 각 기둥의 전단력을 분석하고, 필로티층에 전단벽 또는 가새를 보강하였을 때 보강효과를 평가하고자 한다. 모서리코어가 있는 필로티 건축물에서 필로티층의 코어 반대편 모서리를 전단벽이나 K형 가새로 보강하였을 때 변위와 기둥 전단력이 크게 감소하는 것으로 나타났으며, 모서리 양면을 K형 가새로 보강하는 것보다 한 면을 전단벽으로 보강하는 것이 보강효과가 큰 것으로 나타났다.

기존 저층 필로티 건물의 스펙트럼 변위 기반 손상도 기준 개선 (Improvement of Spectral Displacement-Based Damage State Criteria of Existing Low-Rise, Piloti-Type Buildings)

  • 김태완
    • 한국지진공학회논문집
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    • 제25권5호
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    • pp.201-211
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    • 2021
  • The Ministry of the Interior and Safety in Korea developed seismic fragility function for various building types in 2009. Damage states for most building types were determined by structural analyses of sample models and foreign references because actual cases damaged by earthquakes rarely exist in Korea. Low-rise, piloti-type buildings showed severe damage by brittle failure in columns due to insufficient stirrup details in the 2017 Pohang earthquake. Therefore, it is necessary to improve damage state criteria for piloti-type buildings by consulting actual outcomes from the earthquake. An analytical approach was conducted by developing analysis models of sample buildings reflecting insufficient stirrup details of columns to accomplish the purpose. The result showed that current spectral displacements of damage states for piloti-type buildings might be too large to estimate actual fragility. When the brittle behavior observed in the earthquake is reflected in the analysis model, one-fourth through one-sixth of current spectral displacements of damage states may be appropriate for existing low-rise, piloti-type buildings.

아라미드 섬유시트로 기둥 보강된 필로티 구조물의 내진성능 평가 (Seismic Performance of Piloti-Type Structures with Columns Strengthened with Aramid Fiber Sheets)

  • 양근혁;문주현;임채림;노광근
    • 한국구조물진단유지관리공학회 논문집
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    • 제27권6호
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    • pp.201-210
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    • 2023
  • 이 연구의 목적은 필로티 건축물에서 아라미드 섬유시트의 연성보강 효과를 평가하는데에 있다. 필로티 구조물은 총 2개가 제작되었으며, 반복 횡하중 정적 실험으로 휨 거동을 평가하였다. 연성보강 효과는 횡하중-변위관계, 변위연성비, 일손상지수 및 비틀림 거동으로부터 검증되었다. 실험결과 기둥이 아라미드 섬유시트로 보강된 필로티 건축물은 최대하중 이후 기둥에서 효과적인 구속효과로 전단파괴 방지 및 비틀림이 최소화되었으며, 전반적으로 연성적인 거동을 보였다. 결과적으로 기둥이 아라미드 섬유시트로 보강된 필로티 건축물의 변위연성비 및 일손상지수는 보강되지 않은 필로티 건축물보다 각각 4.63배 및 42.81배 높았다.

필로티형 저층 내력벽주택의 내진설계 고려사항 (Considerations for Seismic Design of Low-Rise Residential Bearing Wall Buildings with Pilotis)

  • 이승제;엄태성
    • 한국지진공학회논문집
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    • 제23권1호
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    • pp.31-42
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    • 2019
  • In this study, the results of an analytical investigation on the seismic behavior of two residential 4-story bearing wall buildings with pilotis, each of which has symmetric or unsymmetric wall arrangement at their piloti level, are presented. The dynamic characteristics and lateral resistance of the piloti buildings were investigated through linear elastic and nonlinear static analyses. According to the results, the analytical natural period of vibration of the piloti buildings were significantly shorter than the fundamental period calculated in accordance with KBC 2016. In the initial elastic behavior, the walls resisting in-plane shear contributed to the lateral stiffness and strength, while the contribution of columns resisting flexural moments in double curvature was limited. However, after the shear cracking and yielding of the walls occurred, the columns significantly contributed to the residual strength and ductility. Based on those investigations, design recommendations of low-rise bearing wall buildings with piloti configuration are given.

포항지진의 피해 결과를 반영한 기존 저층 필로티 건물의 지진취약도함수 (Seismic Fragility Function for Existing Low-Rise Piloti-Type Buildings Reflecting Damage From Pohang Earthquake)

  • 김진영;김태완
    • 한국지진공학회논문집
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    • 제25권6호
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    • pp.251-259
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    • 2021
  • Current seismic fragility functions for buildings were developed by defining damage state threshold based on story drift concerning foreign references and using the capacity spectrum method based on spectral displacement. In this study, insufficient details and dependence on the core location of piloti-type buildings were not reflected in the fragility function because it was developed before the Pohang earthquake. In order to develop an improved one for piloti-type buildings, several types of core were selected, damage state threshold was determined based on the capacity of structural members, and three-dimensional analyses were utilized. As a result, seismic fragility functions based on spectral acceleration were developed for various core locations and different shear strengths of the column stirrup. The fragility of piloti-type buildings significantly varied according to core location, an additional single wall, and whether the contribution of column stirrup was included or not. To estimate fragility more reasonably, it is necessary to prepare the parameters to reflect actual state well.

코어 외 추가 벽체와 기둥 띠철근 간격이 필로티 건물의 내진성능에 미치는 영향 (Effect of Stirrup Spacing of Columns and an Additional Wall other than Core Walls on the Seismic Performance of Piloti-type Buildings)

  • 이수정;김태완
    • 한국지진공학회논문집
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    • 제28권4호
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    • pp.171-181
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    • 2024
  • For low-rise piloti-type buildings that suffered significant damage in the Pohang earthquake, the seismic performance of those designed by codes issued before and after the earthquake has been recently revised. This study started with the expectation that many of the requirements presented in the current codes may be excessive, and among them, the spacing of column stirrup could be relaxed. In particular, the recently revised design code of concrete structures for buildings, KDS 41 20 00, suggests that the column stirrup spacing is 1/2 of the minimum cross-sectional size or 200 mm, which is strengthened compared to KBC 2016, but relaxed than the current KDS, 41 17 00, which is 1/4 of the minimum size or 150 mm. As a result of the study, it was found that the target performance level was sufficiently satisfied by following the current standards and that it could be satisfied even if the relaxed spacing was followed. Therefore, the strict column stirrup spacing of KDS 41 17 00 could be relaxed if a wall other than core walls is recommended in the current guideline for the structural design of piloti-type buildings.

초등학교(初等學校) 필로티 공간(空間)의 이용실태(利用實態) 및 계획방향(計劃方向)에 관한 연구(硏究) (A Study on Usage Pattern and Plan of the Piloti Space in the Elementary School)

  • 이상호;이상규;김성주;백지원
    • 교육시설
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    • 제7권4호
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    • pp.17-26
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    • 2000
  • The purpose of this study is to suggest how to use the piloti space at a primary school planning which is the critical element of an exterior space. On the process, we define the Piloti function as the connection of exterior spaces and the community and the parking lot. These research data give us helpful ideas to plan a positive exterior space at an elementary school by use of piloti space, in terms of its suitable location and size.

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2017년 포항지진으로 피해를 입은 국내 필로티형 건물의 지진 거동 (Seismic Behavior of Domestic Piloti-type Buildings Damaged by 2017 Pohang Earthquake)

  • 김태완;추유림;김승래;번다리 디워스
    • 한국지진공학회논문집
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    • 제22권3호
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    • pp.161-168
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    • 2018
  • Pohang earthquake occurred on November 15, 2017, with a magnitude of 5.4. The damage of the structure caused by the Pohang earthquake was the most significant in 4-story piloti-type buildings, where the damage patterns were different according to the location of columns and walls at the first story. One building with a staircase at a corner shows shear failure at columns, and Another building with a staircase in the middle shows no failure or shear failure at staircase walls. Therefore, two different piloti-type buildings were selected; one has a staircase at a corner and another has in the middle, and the seismic behavior of the buildings were examined by nonlinear dynamic analysis applying a ground motion measured at Pohang. Analytical model well simulated the actual behavior of the piloti-type buildings during the earthquake. Analysis results showed that walls have an insufficient shear strength wherever the location of the staircase is and columns with insufficient transverse reinforcement could be failed when the staircase is located at a corner. Conclusively, structural engineers should design columns and walls in piloti-type buildings to possess sufficient capacity according to the location of staircase.