중층 및 고층 목조 건축물의 하이브리드 시스템 유형 분석

김윤미(Kim, Yoon-Mi),김영민(Kim, Yeong-Min) 대한건축학회 2022 대한건축학회논문집 Vol.38 No.11

The hybrid systems of timber buildings were classified into three types according to the composite and combination types: member level, sub-system level, and structural system level. The member level hybrid system is achieved when more than two structural materials including timber are composed to make a single member. A sub-system level hybrid system is achieved when various material types of structural members are mixed to make a single sub-structure. And a structural system level hybrid system is achieved when several sub-systems are combined to make a complete structural system. There were 44 cases of mid and high-rise timber buildings analyzed according to these three hybrid types. Sub-system and structural system level hybrid systems showed more application ratios than the member level hybrid system. As a building becomes taller, the system level hybrid system showed more application ratio. The combination tendency of the structural material showed that the combination of timber and concrete showed the highest application ratio, and that the timber, concrete, and steel showed half of that. As the building becomes taller, the combination of timber, concrete, and steel showed more application ratio to achieve more structural performance.

Wind Resistance Performance Evaluation of Cable-Type Curtain Wall System on Reinforced Concrete High-Rise Buildings

Hyun Soo Park,Jong Ho Won,Woong June Chung 한국콘크리트학회 2019 International Journal of Concrete Structures and M Vol.13 No.2

In this research, a cable-type wall system that could replace the conventional aluminum curtain wall system for reinforced concrete high-rise buildings is proposed. The cable-type wall system is a newly developed system, which could be used as an existing exterior skin system, and can effectively support the wind load acting on the exterior of the high-rise buildings by the pre-induced initial tension force to the cable supporting the glass. The main advantages of the cable-type wall system are that the expense of construction could be reduced due to the simplicity of the construction. The experiment of structural analysis and air/water tightness was performed to evaluate its feasibility of industrialization. The structural performance of the cable-type wall system was evaluated through the structural analysis and the full-scale experiment to predict the initial pre-tension force and the design load displacement of the vertical one-way cable-type wall system that can be used for a typical floor of the high-rise building. The initial pretension force and structural behavior of the cable were analyzed by using the structural design program MIDAS-Gen. The maximum deformation value in the structural test was found to satisfy the AAMA condition, which is equal to the size of the facade skin system. The air/water tightness test was conducted to verify the performance. Test results show that the cable-type wall system satisfies the air/water tightness performance standards ASTM E283, E331 and AAMA 501.1-05 which are the most basic standards that the facade system must provide. As a result of this study, it is expected that the proposed cable-type wall system could be used for facade system, not only the structural performance but also air/water tightness performance are secured.

커튼월시스템의 풍하중 성능평가

최심국,원종호,박현수,하영철 한국풍공학회 2018 한국풍공학회지 Vol.22 No.1

In this research, we proposed a cable wall system that can replace the aluminum curtain wall system. The cable wall system is a new system, which is used as the existing exterior material, and can effectively support the wind load acting on the exterior of the building, by using the initial tension to the cable supporting the glass. The structural performance of the cable wall system was evaluated through the structural analysis and the full scale experiment to predict the initial tension and the design load displacement of the vertical one-way cable wall system that can be used for a typical floor of the high-rise building. The initial tension and structural behavior of the cable were analyzed by using the structural design program MIDAS-Gen. The maximum deflection value in the structural test was found to satisfy the AAMA condition, which is equal to the size of facade system. As a result of this study, it is expected that when the proposed cable wall system is used for facade system, not only the structural performance is secured. Furthermore, the expense of construction will be reduced because of the simplicity of the construction. 본 연구에서는 기존외장재로 사용되고 있는 알루미늄 커튼월시스템을 대신할 수 있는 공법으로, 유리를 지지하는 케이블에 초기장력을 도입하여 건축외장재에 작용되는 풍하중을 효과적으로 지지할 수 있는 케이블월 시스템을 제안하였다. 고층건축물 기준층에 적용할 수 있는 상하로 연결된 수직 일방향 케이블시스템에 케이블의 초기장력과 설계하중에 대한 변위를 예측할 수 있도록 구조 해석과 실물크기의 실험을 통해 케이블월 시스템의 구조성능을 평가하였다. 구조설계 프로그램인 MIDAS-Gen을 이용하여 케이블의 초기장력 및 구조거동을 해석하였고, 구조실험에 나타난 최대 처짐 값은 케이블구조 국제허용 처짐인 AAMA 조건에도 만족한 것으로 나타났다. 또한 구조해석을 통해 나타난 결과 값이 실제 외장재 크기에 동일한 하중조건으로 작용한 구조실험 결과 값과 거의 유사한 것으로 나타났다. 본 연구를 통해 얻어진 결과로, 제안된 케이블월 시스템을 건축외장재에 사용할 경우 구조성능은 충분히 확보될 뿐만 아니라 개방성이 확보되고 시공이 간편하여 공사비용을 절감시킬 것으로 예상된다.

IsoTruss<SUP>®</SUP> 그리드를 적용한 건물구조시스템의 특성

김태헌(Tae-Heon Kim),김영찬(Young-Chan Kim) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.2

본 최근 기존의 모습과는 다른 고층건물의 형태가 대도시에서 랜드마크로서 주목을 끌고 있으며 혁신적인 건물형태에 대한 탐색은 건축분야에서 지속적으로 이루어질 것이다. 본 연구에서는 소규모의 구조체에 활용되고 있는 Isotruss<SUP>®</SUP> 그리드를 건물의 외주골조에 적용하여 구조적 성능을 검토하였다. 구조적 거동을 비교하기 위해 다이아그리드 구조시스템을 준거로 하였다. 동일한 규모의 16층, 32층, 48층 건물을 두가지의 구조시스템으로 설계하였다. 아이소트러스 그리드 구조 부재의 선정은 예비적 설계단계로 생각하여 다이아그리드의 강성에 기준한 설계방법을 이용하였다. 경사기둥의 각도로 아이소트러스 구조는 59°, 다이아그리드 구조는 68.2°로 하였다. 횡강성, 철골량, 외부골조의 횡력 부담비율, 기둥의 축력 강도비, 고유진동수를 비교하였다. 6개의 건물 모델을 해석한 결과 두 구조시스템의 구조적 성능은 유사하나 외주골조의 횡하중 분담율이 아이소트러스 그리드 구조가 93.3%로 다이아그리드 구조의 88.7% 보다 약간 커서 코어 기둥의 배치에 있어 유리하다고 볼 수 있다. 따라서 본 연구에서 제안하는 아이소트러스 그리드 시스템은 입면형태가 독특할 뿐만 아니라 기존의 구조시스템과 동등한 구조적 성능을 보유한 것으로 보인다. Recently, unconventional high-rise building shapes have attracted attention as a landmark of metropolitan cities and the search for innovative building forms in architecture is ongoing. In this study, IsoTruss<SUP>®</SUP> grid(ITG) used in smaller scale structures was applied to building structural systems and its structural performance was examined. The structural behavior of an ITG was compared with that of a diagrid structure as a reference structure. The stiffness-based design method of the diagrid system was used for the preliminary design stage of member sizing in an ITG. The structural design of 16, 32, and 48-story buildings was carried out for the two systems with the same size. The angle of the inclined columns for ITG and diagrid was 59° and 68.2°, respectively. The lateral stiffness, steel tonnage of the exterior frame, axial strength ratio, story drift ratio, and natural frequency of the two systems were compared. Based on the analysis result of 6 buildings, the two systems had similar structural capacity; 93.3% and 88.7% of the lateral load was carried by the perimeter frame in the ITG system and diagrid system, respectively. This suggests that the ITG system is better in arranging core columns. Therefore, the proposed ITG system has not only a unique façade, but also substantial structural capacity equivalent to the existing system.

하이브리드 중간층 지진 격리 시스템과 빌딩 구조물의 동시 최적화

강주원,김현수 한국공간구조학회 2019 한국공간구조학회지 Vol.19 No.3

A hybrid mid-story seismic isolation system with a smart damper has been proposed to mitigate seismic responses of tall buildings. Based on previous research, a hybrid mid-story seismic isolation system can provide effective control performance for reduction of seismic responses of tall buildings. Structural design of the hybrid mid-story seismic isolation system is generally performed after completion of structural design of a building structure. This design concept is called as an iterative design which is a general design process for structures and control devices. In the iterative design process, optimal design solution for the structure and control system is changed at each design stage. To solve this problem, the integrated optimal design method for the hybrid mid-story seismic isolation system and building structure was proposed in this study. An existing building with mid-story isolation system, i.e. Shiodome Sumitomo Building, was selected as an example structure for more realistic study. The hybrid mid-story isolation system in this study was composed of MR (magnetorheological) dampers. The stiffnessess and damping coefficients of the example building, maximum capacity of MR damper, and stiffness of isolation bearing were simultaneously optimized. Multi-objective genetic optimization method was employed for the simultaneous optimization of the example structure and the mid-story seismic isolation system. The optimization results show that the simultaneous optimization method can provide better control performance than the passive mid-story isolation system with reduction of structural materials.

공정하고 충실한 법원업무 실현을 위한 법원공무원 직급 · 직렬구조 개편 방안

이학구 ( Lee Hakgu ),김정환,안문희,김성화,서용성 사법정책연구원 2020 연구보고서 Vol.2020 No.17

법원 일반직공무원 직급구조 및 직렬구조는 국가공무원법상의 9계급을 기본으로 하여 4개 직군, 28개 직렬, 32개 직류로 이루어져 있다. 법원 일반직공무원 직급구조는 국가공무 원상의 직급구조를 기본으로 한다는 측면에서 국가기관 공무원 조직의 보편적인 성격을 갖고 있기도 하지만, 법원 업무 및 법원 인적구성원들의 특수성이 있으므로 다른 국가기관과 다른 측면도 있다. 하지만 법원 일반직공무원 직급구조 및 직렬구조의 공무원 조직의 보편성과 특수성을 함께 고찰하여 연구한 자료들은 많지 않다. 이에 전자소송의 확대, 법원 업무의 전산화에 따른 법원 업무 환경 변화에 능동적으로 대응하고, 내부적으로는 승진 적체 및 직렬 간의 갈등을 해결하기 위해 법원 일반직공무원의 직급구조 및 직렬구조에 대해 연구할 필요성이 대두되었다. 본 연구보고서는 본격적으로 법원 일반직공무원 직급구조 및 직렬구조를 논하기 전에 주요 국가들의 법관 이외의 법원 구성원들의 직제 및 승진 등 인사 구조적인 측면을 조사하고 비교하였다. 미국, 일본, 독일, 프랑스의 법관 이외의 법원 구성원들의 직제 및 법원에서 담당하는 구체적인 업무 등을 파악해서 우리나라 법원 일반직공무원 조직에도 적용 가능한 요소들을 도출하였다. 미국의 직무 중심의 직위분류제에서 법원 일반직공무원이 담당하는 직무를 좀 더 구체적으로 계량화 및 표준화시킬 필요성이 있다는 사실을 알 수 있었으며, 일본, 독일, 프랑스에서 승진 체계의 다양화와 전직의 가능성을 통하여 인사 체계의 개방성을 추구하고 있다는 사실도 알 수 있었다. 하지만 각 나라의 법원 조직 및 법원 구성원들의 공무원 신분 여부 등에 따라 우리나라 법원 일반직공무원의 인사 구조와 다른 측면도 있어 일률적인 기준을 가지고 비교 · 검토하기에는 일정부분 한계가 있다. 그리고 법원 일반직공무원 직무의 법적 근거와 실제 법원에서 이루어지고 있는 사무분담을 이용하여 각 직급에 따라 담당하고 있는 업무를 분석하여 직무의 특성을 파악하였다. 이러한 법원 일반직공무원의 직무 특성을 전제로 법원 일반직공무원 직급 및 직렬구조의 문제점으로 직급체계의 합리성과 탄력성 부족, 성과 관리 및 승진에 문제점 노출, 정보화시대에 미흡한 직급구조 및 직렬구조임이 드러났다. 본 연구보고서는 우선 법원 일반직공무원 직급구조 개편안과 관련해서 9계급을 확대 및 축소하는 방법으로 9계급을 4단계로 축소하는 안, 중간 직급을 확대하는 안, 9급 직급체계를 8급 직급체계로 축소하는 안 등을 제시하였다. 그리고 직급구조 개편의 효과인 법원 일반 직공무원의 승진 문제와 관련하여 가장 큰 파급 효과가 있는 상위 직급 정원을 늘리는 방안도 검토하였는데, 구체적으로는 사법보좌관 업무 확대 및 수석사법보좌관 정원 확대 안, 조정위원의 법원 일반직공무원 보직부여 안, 법원조사관 제도의 법제화 및 직급 상향 안 등을 제시하였다. 그리고 9계급 직급구조와 밀접하게 관련되어 있는 고위공무원 인사운영의 유연성을 확대하기 위하여 행정부의 고위공무원단 제도의 도입 여부 등을 검토하고 고위공무원단 제도를 대체할 수 있는 개방형 직위 확대 방안과 법원조직법 개정을 통한 인사운영의 효율성 증대 방안도 제시하였다. 법원 일반직공무원 직렬구조와 관련해서는 크게 법원사무 직렬과 등기사무 직렬 통합 논의와 소수 직렬의 인사운영의 여러 문제 등에 대해 검토하였다. 우선 법원사무 직렬과 등기사무 직렬의 통합 논의 문제는 오랫동안 법원 내부에서 논의했던 문제인 만큼 법원 구성원들의 설문조사와 그동안 연구해온 자료들 위주로 검토하였다. 연구 결과 가장 큰 문제점으로 대두된 것은 등기사무 직렬의 질적 전문성 강화의 필요성과법원 조직 문화의 통합임을 확인할 수 있었다. 이후 구체적인 해결 방안으로 양 직렬 통합안, 양 직렬 통합 및 직류 유지 안, 전직제도 활용 안, 양 직렬 업무 범위 확대 안, 양 직렬통합 이후 보직관리 방식 개선 안을 제시하였다. 제시된 여러 방안의 장· 단점을 분석한 결과 등기사무 직렬을 유지하면서 직렬 분리로 인한 문제점을 해결할 수 있는 최적의 방안으로 전직제도 활용 안을 제시하였다. 끝으로 본 연구보고서가 법원 일반직공무원 직급구조 및 직렬구조에 대하여 법원 구성원 들의 다양한 의견을 개진할 수 있는 계기가 되길 바란다. 또한 다양한 이해관계를 가진 구성원들의 의견이 수렴되어 법원 구성원이 동감하는 직급구조 및 직렬구조 개편으로 이어지길 바란다. 그리하여 최종으로 법원 일반직공무원 직급구조 및 직렬구조가 공정하고 충실한 법원 업무 실현에 이바지하여 국민의 사법서비스 신뢰로 이어지길 간절히 바라는 마음이다. The class and functional category structure of general public officials in court consists of 4 functional groups, 28 functional categories and 32 functional subcategories based on nine grades under the State Public Officials Act. Although the class structure of general public officials in court has the universal nature of government officials organization as it is based on the national public official class structure, it has different aspects from other state agencies due to the particularity of court affairs and court personnel. Nevertheless, there is not much data that has studied to examine the generality and specificity of the class and functional category structure of general public officials in court. Accordingly, the need to study the class and functional category structure of general public officials in court has emerged in order to actively respond to changes in the court’ work environment due to the expansion of electronic litigation and computerization of court work, as well as to resolve internally delayed promotions and conflicts between functional categories. This research report investigated and compared aspects of personnel structure, including the organization of offices and promotions of court members other than judges in major countries, while discussing the class and functional category structure of general public officials in court. By grasping the organization of offices of court members other than judges in the United States, Japan, Germany, and France and the specific duties of those in charge in the courts, factors applicable to the organization of general public officials in courts in Korea could be derived. This research has come to identify that we need to improve and standardize the duties of general court officials in more detail in the job-oriented position classification through studying the systems of the United States, whereas Japan, Germany and France are pursuing the openness of the personnel system through the diversification of the promotion system and the possibility of job changes. however, there would be some limitations in comparing and reviewing with uniform standards, since there might be aspects that are different from the personnel structure of Korean court officials depending on the courts organization and the status of the court members of each country. Furthermore, this report has analyzed the duties of each class by using the legal basis for the duties of general public officials in court and the actual division thereof to identify the characteristics of such duties. Based on the job characteristics of the court officials, the lack of rationality and resilience of the class system, exposure of problems in performance management and promotion, and the insufficient class and functional category structure in the information age were found to be major problems of the class and functional category structure of general public officials in court. In relation to the reorganization of the class structure of general public officials in the court, this research report proposes a few plans such as a plan for reducing the nine-level class to four levels, a plan for expanding the middle level, and a plan for reducing the nine-level class system to an eight-level class system, each as a measure of expanding and reducing the nine-level class system. The report further reviews a plan to increase the number of higher classes that has the greatest ripple effect in relation to the promotion of general public officials in the court as an outcome of the reorganization of the class structure, thereby it suggests some proposals to expand the work of judicial assistant officials and further to increase the number of senior judicial assistant officials, measures for the mediators to be assigned as general court officials, and plans to legalize of the court investigation officer system and ways to raise the class. Moreover, it also examines the introduction of a senior executive service system of the administration to expand the flexibility of senior civil service personnel management, which is closely related to the nine-level class structure, and suggests a plan to expand the open positions to replace the senior executive service system and increase the efficiency of personnel management through the revision of the Court Organization Act. Regarding the functional category structure of general public officials in court, this report deals with discussions on the functional category integration of court affairs and registration affairs and several issues of personnel management regarding the minor functional category. As the issue of the consolidation of the functional categories for court affairs and registration affairs has been discussed within the court for a long time, this research has been conducted through a survey questionnaires of court and the data that have been studied so far. From the results of this research, it has confirmed that the necessity of reinforcing qualitative professionalism in the registration affairs and the integration of court organizational culture were two of the biggest problems that emerged. Subsequently, as concrete solutions, measures such as two-functional categories integration, the maintenance of functional subcategory in addition to the two-functional categories integration, the use of a job change system, the expansion of the scope of two-functional categories work, and the improvement of the position management method after two-functional categories integration has been brought as viable proposals. After analyzing the merits and demerits of the various plans proposed, a plan to use a job change system was suggested as an optimal method to solve the problems caused by the functional subcategory separation while maintaining the functional subcategory of registration affairs. Lastly, a study on the minor functional category was reviewed by focusing on the functional category having a problem in terms of personnel management among various minor functional categories. Specifically, measures to expand the scope of duties of the functional category for management, the discussion regarding integration of the functional categories for armament and environment, the operational problem of the functional category for emergency preparedness and the functional category for court security management, high class integration of the functional category for technical affairs, and the problem of the salary system of a few specific functional categories were examined. Finally, it is hoped that this research report will serve as an momentum for court members to express their opinions on the class and functional category structure of general public officials in the court. Additionally, it is also hoped that the opinions of members with various interests will be collected, leading to a reorganization of the class and functional category structure that the court members agree with. In the end, it is sincerely wished that the class and functional category structure of public officials in the court will contribute to the realization of fair and faithful court work, ultimately being conducive to public trust in the judicial service as a whole.

다단계 목표계획법을 이용한 복합구조제어시스템의 통합최적설계

박관순,고현무,옥승용 한국지진공학회 2003 한국지진공학회논문집 Vol.7 No.5

이 연구에서는 지진하중을 받는 빌딩구조물에 대한 복합구조제어시스템의 최적설계방법을 제시한다. 복합구조제어시스템의 설계는 구조물의 부재뿐만 아니라 수동제어시스템 및 능동제어시스템의 용량 및 위치 최적화 과정으로 정의된다. 최적설계는 이 연구에서 제안된 다단계 목표계획법(Multi-Stage Goal Programming)을 이용하여 최적화문제를 정식화하고 목표갱신 유전자알고리즘(Goal-Updating Genetic Algorithm을 적용하여 합리적인 최적화를 진행해가는 과정으로 구성된다. 다단계 목표계획법에서는 구조물의 층간 상대변위와 제어시스템의 용량에 대한 설계목표를 여러 단계로 선정하고, 각 물리량과 설계목표간의 정규화된 거리 합으로서 목적함수를 정의한다. 목표갱신 유전자알고리즘은 각 단계별 설계목표를 만족하는 최적해를 검색하고, 현 단계의 모든 설계목표를 만족하는 최적해가 존재할 경우 설계목표를 순차적으로 갱신함으로써 보다 상위수준의 설계목표로 접근해 나아간다. 지진하중을 받는 9층의 빌딩구조물에 대한 수치 예를 통하여 복합구조제어시스템의 통합최적설계 과정을 기술하였고, 구조부재, 수동 및 능동제어시스템이 균등분포된 구조물과 최적 설계결과를 비교하여 제시하는 방법의 효율성을 검증하였다. An optimal design method for hybrid structural control system of building structures subject to earthquake excitation is presented in this paper. Designing a hybrid structural control system may be defined as a process that optimizes the capacities and configuration of passive and active control systems as well as structural members. The optimal design proceeds by formulating the optimization problem via a multi-stage goal programming technique and, then, by finding reasonable solution to the optimization problem by means of a goal-updating genetic algorithm. In the multi-stage goal programming, design targets(or goals) are at first selected too correspond too several stages and the objective function is th n defined as the sum of the normalized distances between these design goals and each of the physical values, that is, the inter-story drifts and the capacities of the control system. Finally, the goal-updating genetic algorithm searches for optimal solutions satisfying each stage of design goals and, if a solution exists, the levels of design goals are consecutively updated to approach the global optimal solution closest too the higher level of desired goals. The process of the integrated optimization design is illustrated by a numerical simulation of a nine-story building structure subject to earthquake excitation. The effectiveness of the proposed method is demonstrated by comparing the optimally designed results with those of a hybrid structural control system where structural members, passive and active control systems are uniformly distributed.

시스템 다이내믹스 기반 해양구조물 분리시스템의 설계검증 방법에 관한 연구

황존규,고재용,이동건,박본영 해양환경안전학회 2020 海洋環境安全學會誌 Vol.26 No.6

본 연구는 시스템 다이내믹스를 기반으로 해양구조물 분리시스템(Separation system)의 설계검증 방법을 제안하였다. 해양구조물 분리시스템은 부가가치 측면에서 EPC 프로젝트의 성공 여부를 결정할 수 있는 상부구조(Topsides)의 가장 중요한 시스템 중 하나이다. 그럼에도 불구하고, 설계검증에 대한 지금까지의 실태는 설계 작업의 프로세스 진행이나 도면작성 및 제공에 국한되어 있어 기본설계 단계에서 설계검증의 미흡으로 인하여 계약 후 잦은 설계변경에 의한 기업손실이 발생되어 왔다. 이러한 맥락에서 본 연구의 목적은 해양구조물의 전체 프로젝트 수행 기간에 성공적인 사업수행을 도모하고자 설계검증 모델을 구축하여 적용하도록 하였다. 제안된 설계검증 방법은 상세설계의 효과적인 실행뿐만 아니라 초기설계 단계에서 기술적 오류나 불일치 사항을 미리 찾아냄으로써 해양구조물의 엔지니어링, 조달 및 건조에 대한 경쟁력을 향상시키는데 기여 할 것으로 예상한다. 본 연구에서는 먼저 건조한 실적선 자료를 바탕으로 설계검증을 수행하여 FPSO 분리시스템에 적용하고 ISO 15288 국제 표준을 준수하였다. 결과적으로, 제안된 설계검증 방법이 해양구조물의 FEED 검증 프로세스에 적용될 수 있으며, 향후 해양 프로젝트의 성공적인 수행에 의한 이익창출을 도모할 수 있을 것이다. 또한, 해양구조물 건조 시 설계변경에 의한 막대한 손실을 최소화 할 수 있을 것으로 기대한다. This paper proposes a design verification method based on system dynamics for offshore separation systems. Oil and gas separation systems are key components of offshore oil platforms; these systems determine the competitiveness of engineering, procurement, and construction (EPC) projects, especially in terms of added value. However, previous research on design verification has been limited to the process and deliverables of design. To address this, the study aims to develop a comprehensive design verification method and the associated functions from the perspective of project management, for the entire project life-cycle of offshore structures. The proposed methodology for design verification is expected to contribute toward effective and detailed designs as well as improve the competitiveness of EPC companies in constructing offshore structures during the early design stages. We first analyzed the separation system of the FPSO using the design verification method adopted by advanced countries and compared it with the system dynamics process formalized as ISO 15288. Subsequently, a tailored process for the design verification of the offshore structure was derived. It is shown that the proposed design verification method can be applied to the front-end engineering design process of offshore structures. Moreover, it can contribute toward the successful performance of offshore projects in the future and also minimize design changes and critical risks during the construction of these offshore structures.

Structural Performance of a Segmental Precast Arch System with Outrigger by Sectional Geometry of Structural Member

전석현,이학준,문종훈,허정원,안진희 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.11

This study investigated the structural behavior of an arch system composed of segmental precast concrete panels and steel outrigger ribs, with respect to the cross-sectional geometries of the structural members. Thus, a three-dimensional finite element (3D FE) analysis of the proposed arch system was conducted at each construction step, and the cross-sectional geometries of the structural members were varied. From the results of the FE analysis regarding the structural-member cross-sectional configurations and geometries, the changes in stress and deformation were identified with respect to the changes in the thickness of the precast panels, thickness of the outrigger ribs, and height of the V-strip. Stresses and displacements of structural members in the proposed arch system were affected up to 48% by the height of the V-strip and the thickness of the outrigger ribs. The thickness of the precast panel affected relatively small on its structural behaviors. Therefore, the height of the V-strip and thickness of the outrigger ribs should be considered as the major design parameters for the design of the proposed arch system.

Implementation of a bio-inspired two-mode structural health monitoring system

Tzu-Kang Lin,Li-Chen Yu,Kuo-Chun Chang,Anne Kiremidjian,Chang-Hung Ku 국제구조공학회 2011 Smart Structures and Systems, An International Jou Vol.8 No.1

A bio-inspired two-mode structural health monitoring (SHM) system based on the Naïve Bayes (NB) classification method is discussed in this paper. To implement the molecular biology based Deoxyribonucleic acid (DNA) array concept in structural health monitoring, which has been demonstrated to be superior in disease detection, two types of array expression data have been proposed for the development of the SHM algorithm. For the micro-vibration mode, a two-tier auto-regression with exogenous (AR-ARX)process is used to extract the expression array from the recorded structural time history while an ARX process is applied for the analysis of the earthquake mode. The health condition of the structure is then determined using the NB classification method. In addition, the union concept in probability is used to improve the accuracy of the system. To verify the performance and reliability of the SHM algorithm, a downscaled eight-storey steel building located at the shaking table of the National Center for Research on Earthquake Engineering (NCREE) was used as the benchmark structure. The structural response from different damage levels and locations was collected and incorporated in the database to aid the structural health monitoring process. Preliminary verification has demonstrated that the structure health condition can be precisely detected by the proposed algorithm. To implement the developed SHM system in a practical application, a SHM prototype consisting of the input sensing module, the transmission module, and the SHM platform was developed. The vibration data were first measured by the deployed sensor, and subsequently the SHM mode corresponding to the desired excitation is chosen automatically to quickly evaluate the health condition of the structure. Test results from the ambient vibration and shaking table test showed that the condition and location of the benchmark structure damage can be successfully detected by the proposed SHM prototype system, and the information is instantaneously transmitted to a remote server to facilitate real-time monitoring. Implementing the bio-inspired two-mode SHM practically has been successfully demonstrated.