• Title/Summary/Keyword: seismic performance

Search Result 1,658, Processing Time 0.051 seconds

Seismic Performance Evaluation of Small-size Pilloti-type Reinforced Concrete Buildings using Nonlinear Dynamic Analysis (비선형 동적해석을 이용한 소규모 필로티형 철근콘크리트 건축물의 내진성능평가)

  • Yoo, Changhwan;Kim, Taewan;Chu, Yurim
    • Journal of the Earthquake Engineering Society of Korea
    • /
    • v.20 no.4
    • /
    • pp.191-199
    • /
    • 2016
  • Piloti-type building is one of typical vertical atypical buildings. These buildings can fail by weak-story or flexible-story mechanism on the first story. They should be designed by taking into account the special seismic load, but those less than six stories are not required to confirm the seismic performance from structural engineers in Korea. For this reason, small-size pilloti-type RC buildings need to be checked for seismic performance. Based on this background, this study performed nonlinear dynamic analysis using the PERFORM-3D for small-size pilloti-type RC buildings and assessed their seismic performance. Examples are two through four story buildings with and without walls in the first story. The walls and columns in the first story satisfied the target performance in the basic of flexural behavior due to quite a large size and reinforcement. However, wall shear demands exceed shear strength in some buildings. When designed for KBC2009, wall shear strength exceed shear demand in some buildings, but still does not in others. Consequently, wall shear must be carefully checked in both existing and new small-size pilloti-type RC buildings.

Computerized Modules for Seismic Performance Evaluation of Existing Buildings (기존건축물 내진성능평가를 위한 전산시스템 모듈 개발)

  • Hwang, Sunwoo;Kim, Taejin;Kim, Jong-Ho
    • Journal of the Earthquake Engineering Society of Korea
    • /
    • v.20 no.4
    • /
    • pp.269-276
    • /
    • 2016
  • Seismic performance evaluation of existing building usually needs much time and man power, especially in case of nonlinear analysis. Many data interaction steps for model transfer are needed and engineers should spend much time with simple works like data entry. Those time-consuming steps could be reduced by applying computerized and automated modules. In this study, computational platform for seismic performance evaluation was made with several computerized modules. StrAuto and floor load transfer module offers a path that can transfer most linear model data to nonlinear analysis model so that engineers can avoid a lot of repetitive work for input information for the nonlinear analysis model. And the new nonlinear property generator also helps to get the nonlinear data easily by importing data from structural design program. To evaluate the effect of developed modules on each stages, seismic performance evaluation of example building was carried out and the lead time was used for the quantitative evaluation.

Decision Making of Seismic Performance Management Using Seismic Risk Assessment (지진위험도평가 방법을 이용한 내진성능관리 의사결정)

  • Kim, Dong Joo;Choi, Ji Hye;Kim, Byeong Hwa
    • Journal of the Earthquake Engineering Society of Korea
    • /
    • v.23 no.6
    • /
    • pp.329-339
    • /
    • 2019
  • The strategy for the management of earthquakes is shifting from post recovery to prevention; therefore, seismic performance management requires quantitative predictions of damage and the establishment of strategies for initial responses to earthquakes. Currently, seismic performance evaluation for seismic management in Korea consists of two stages: preliminary evaluation and detailed evaluation. Also, the priority of seismic performance management is determined in accordance with the preliminary evaluation. As a deterministic method, preliminary evaluation quantifies the physical condition and socio-economic importance of a facility by various predetermined indices, and the priority is decided by the relative value of the indices; however, with the deterministic method it is difficult to consider any uncertainty related to the return-year, epicenter, and propagation of seismic energy. Also this method cannot support tasks such as quantitative socio-economic damage and the provision of data for initial responses to earthquakes. Moreover, indirect damage is often greater than direct damage; therefore, a method to quantify damage is needed to enhance accuracy. In this paper, a Seismic Risk Assessment is used to quantify the cost of damage of road facilities in Pohang city and to support decision making.

Seismic Performance of High-Rise Intermediate Steel Moment Frames according to Rotation Capacities of Moment Connections

  • Han, Sang Whan;Moon, Ki-Hoon;Ha, Sung Jin
    • International Journal of High-Rise Buildings
    • /
    • v.4 no.1
    • /
    • pp.45-55
    • /
    • 2015
  • The rotation capacity of the moment connections could significantly influence on the seismic performance of steel moment resisting frames. Current seismic provisions require that beam-to-column connections in Intermediate Moment Frames (IMF) should have a drift capacity as large as 0.02 radian. The objective of this study was to evaluate the effect of the rotation capacity of moment connections on the seismic performance of high-rise IMFs. For this purpose, thirty- and forty-story high-rise IMFs were designed according to the current seismic design provisions. The seismic performance of designed model frames was evaluated according to FEMA P695. This study showed that the forty-story IMF satisfied the seismic performance objective specified in FEMA P695 when the rotation capacity of the connections was larger than 0.02. However, thirty-story IMFs satisfied the performance objective when the connection rotation capacity is larger than 0.03.

Seismic performance of a wall-frame air traffic control tower

  • Moravej, Hossein;Vafaei, Mohammadreza;Abu Bakar, Suhaimi
    • Earthquakes and Structures
    • /
    • v.10 no.2
    • /
    • pp.463-482
    • /
    • 2016
  • Air Traffic Control (ATC) towers play significant role in the functionality of each airport. In spite of having complex dynamic behavior and major role in mitigating post-earthquake problems, less attention has been paid to the seismic performance of these structures. Herein, seismic response of an existing ATC tower with a wall-frame structural system that has been designed and detailed according to a local building code was evaluated through the framework of performance-based seismic design. Results of this study indicated that the linear static and dynamic analyses used for the design of this tower were incapable of providing a safety margin for the required seismic performance levels especially when the tower was subjected to strong ground motions. It was concluded that, for seismic design of ATC towers practice engineers should refer to a more sophisticated seismic design approach (e.g., performance-based seismic design) which accounts for inelastic behavior of structural components in order to comply with the higher seismic performance objectives of ATC towers.

Estimation Method for Seismic Performance and Damping Requirement of Elastic Perfectly Plastic Structures using Newmark and Hall's Response Spectrum (Newmark & Hall의 응답스펙트럼을 이용한 완전탄소성 구조물의 내진성능 및 요구감쇠비 산정법)

  • Kim, Hyeong-Gook;Kim, Kil-Hee
    • Journal of the Architectural Institute of Korea Structure & Construction
    • /
    • v.32 no.2
    • /
    • pp.11-19
    • /
    • 2016
  • An estimation method for seismic performance and damping requirement of elastic perfectly plastic structures is proposed in this paper. To assess the seismic performance of structures without iterative analysis and non-convergence problems of the capacity spectrum method, the capacity curve and the demand spectrum are assumed to be functions of the ductility factor. The damping requirement to achieve a prescribed performance target is evaluated using the relationship between the amplification factors in Newmark & Hall's response spectrum and a prescribed inelastic displacement. Time history response analysis is carried out and the results are compared with those obtained using the proposed method to confirm its validity. The analytical results shown that, if the ductility value is less than 6 for elastic perfectly plastic structures, the proposed method is effective at estimating seismic performance and damping requirement of structures, using a single process during the preliminary design phase for building structures or damping devices.

Seismic Performance Evaluation of Steel Moment Frame Factory Building with Slender Braces (세장한 가새가 사용된 철골모멘트골조 공장시설물의 내진 성능평가)

  • Kim, Dong Yeon;Cho, Jae Chul;Hwang, Sunwoo;Kim, Taejin;Kim, Jong Ho
    • Journal of the Earthquake Engineering Society of Korea
    • /
    • v.22 no.1
    • /
    • pp.33-43
    • /
    • 2018
  • 'Seismic Performance Evaluation Method for Existing Buildings (2013)' developed in accordance with the overseas guidelines ASCE 41 - 06 is the most widely used procedure among domestic seismic performance evaluation guidelines in Korea. However, unlike ASCE 41 - 06, it stipulates that the final performance should be derived as the gravity load distribution ratio of the lateral force resistance system in the guideline. Therefore, in the case of a dual steel structure system with slender braces, where the internal moment frame is mostly responsible for the gravity load, the evaluation of slender braces based on gravity load distribution ratio is difficult to be achieved. In this research, we propose an objective evaluation process for such system by evaluating seismic performance for large-scale factory facilities as an example.

Seismic Fragility Evaluation of Isolated NPP Containment Structure Considering Soil-Structure Interaction Effect (지반-구조물 상호작용 효과를 고려한 지진격리시스템이 적용된 원전 격납건물의 지진 취약도 평가)

  • Eem, Seung Hyun;Jung, Hyung Jo;Kim, Min Kyu;Choi, In Kil
    • Journal of the Earthquake Engineering Society of Korea
    • /
    • v.17 no.2
    • /
    • pp.53-59
    • /
    • 2013
  • Several researches have been studied to enhance the seismic performance of nuclear power plants (NPPs) by application of seismic isolation. If a seismic base isolation system is applied to NPPs, seismic performance of nuclear power plants should be reevaluated considering the soil-structure interaction effect. The seismic fragility analysis method has been used as a quantitative seismic safety evaluation method for the NPP structures and equipment. In this study, the seismic performance of an isolated NPP is evaluated by seismic fragility curves considering the soil-structure interaction effect. The designed seismic isolation is introduced to a containment building of Shin-Kori NPP which is KSNP (Korean Standard Nuclear Power Plant), to improve its seismic performance. The seismic analysis is performed considering the soil-structure interaction effect by using the linearized model of seismic isolation with SASSI (System for Analysis of Soil-Structure Interaction) program. Finally, the seismic fragility is evaluated based on soil-isolation-structure interaction analysis results.

Seismic Performance Evaluation of School Buildings in Gyunggi Region Considering Seismic Hazard Map (상세재해지도를 고려한 경기지역 학교건축물의 내진성능평가)

  • Ryn, Han-Gook;Park, Tae-Won;Lee, Sang-Hyun;Chung, Lan;Cho, Seung-Ho
    • Journal of the Korean Society of Safety
    • /
    • v.24 no.4
    • /
    • pp.66-73
    • /
    • 2009
  • Since the school buildings are generally used as public shelters when the natural disasters such as flood and earthquake occur, it must be designed to show enough structural performance when subject to earthquake. Major failure mode of the school buildings observed in past earthquakes were shear failure of column of which length is shortened by infilled masonry blocks. In this study, the seismic risk of the reinforced concrete school building structure was evaluated by using the seismic performance evaluation methods of low-story RC structures developed in Japan and the required seismic performance index which is obtained according to the KBC2008 seismic hazard map and soil types. In this paper, the seismic performance of the school building is evaluated by considering this short-column effects, building shape and deterioration.

A Study on the Methods of Enhancing the Seismic Performance for Reinforced Concrete School Buildings - Ordinary Moment Frame (철근콘크리트 보통모멘트 골조형식 학교건축물의 내전성능 향상 방안 연구)

  • Kim, Hyeon-Jin;Lee, Sang-Hyun
    • Journal of the Korean Society of Safety
    • /
    • v.24 no.4
    • /
    • pp.74-81
    • /
    • 2009
  • In this study, the seismic performance of RC school buildings which were not designed according to earthquake-resistance design code were evaluated by using response spectrum and push-over analyses. The torsional amplification effect due to plan irregularity is considered and then the efficiency of seismic retrofitting methods such as RC shear wall, steel frame, RC frame and PC wing wall was investigated. The analysis result indicate that the inter-story drift concentrated in the first floor and most plastic hinge forms at the column of the first story. Among the retrofitting methods, the PC wing wall has the highest seismic performance in strength and story drift aspect. Especially, it can make building ductile behavior due to the concentrated inter-story drift at the first column hinge is distributed overall stories. The axial force, shear force and moment magnitude of existing elements significantly decreased after retrofitting. However, the axial and shear force of the elements connected to the additional retrofitting elements increased, and especially the boundary columns at the end of the retrofitting shear wall should be reinforced for assuring the enhancement of seismic performance.