본 논문는 개폐식 대공간 구조물의 지진하중에 대한 동적응답을 줄이기 위한 목적으로 파라메트릭 설계 기법을 적용한 TMD에 관한 연구이다. 인공지능 알고리즘을 이용하여 감쇠장치의 설치 위치를 자동 탐색하는 컴포넌트를 개발하였다. 이는 구조물의 동적응답을 실시간으로 확인하고, 구조물의 감쇠장치 최적의 위치를 찾을 수 있을 있다. 또한, 여러 대안에 대한 감쇠장치 질량의 최적 값을 찾아주며, 지붕의 열린 상태와 닫힌 상태에 모두 효과적으로 적용될 수 있는 설계안을 찾을 수 있다.

본 연구의 목적은 개폐식 대공간 구조물의 풍하중 산정 및 구조해석의 과정을 자동으로 수행하는 컴포넌트를 개발하는 것이다. 설계한 파라메트릭 모델링을 StrAuto를 통해 구조해석 자동화단계를 거쳐 구조해석용 모델로 변환하는 과정을 실시간 으로 연동하여 구조해석 결과를 자동으로 도출하는 과정으로부터 본 연구에서는 추가로 구조물의 풍하중을 형상에 따라 상세히 할당하는 기능을 개발하였다. 이와 같은 과정을 통해 풍하중에 대한 최적화를 수행하여, 기존 설계된 구조의 물량을 줄이고, 구조적 안정성은 유지하는 방향으로 결론을 도출하였다. 추후에는 본 예제 모델을 통해 진동제어 최적화를 위한 제진 장치 설치위치의 자동탐색이 가능하게 되는 연구를 진행할 계획이다.

In this study, the retractable-roof spatial structure was chosen as the analytical model and a tuned mass damper (TMD) was installed in the analytical model in order to control the seismic response. The analysis model is mainly consisted of runway trusses (RT) and transverse trusses (TT), and the displacement response was analyzed by installing TMD on those trusses. The mass of the single TMD which is installed in the analytical model was set to 1% of the total structure mass and the total TMD mass ratio was set to be 8% or 6%. In addition, the mass of a single TMD was varied depending on the number of installations. As a result of analyzing the optimal number of installations of TMD, the displacement response was reduced in all cases compared to the case without TMD. Above all, the case with 8 TMDs was the most effective in reducing he displacement response. However, in this case, as the load on the upper structure of the retractable-roof spatial structure increases, the total mass ratio of TMD was maintained and the number of TMDs was increased to reduce the mass ratio of one TMD.

In the precedent study, the retractable-roof spatial structure was selected as the analytical model and a tuned mass damper (TMD) was installed to control the dynamic response for the earthquake loads. Also, it is analyzed that the installation location of TMD in the analytical model and the optimal number of installations. A single TMD mass installed in the analytical model was set up 1% of the mass of the whole structure, and the optimum installation location was derived according to the number of change. As a result, it was verified that most effective to install eight TMDs regardless of opening or closing. Thus, in this study, eight TMDs were installed in the retractable-roof spatial structure and the optimum mass ratio was inquired while reducing a single TMD. In addition, the optimum mass distribution ratio was identified by redistributing the TMD masses differently depending on the installation position, using the mass ratio of vibration control being the most effective for seismic load. From the analysis results, as it is possible to confirm the optimum mass distribution ratio according to the optimum mass ratio and installation location of the TMD in the the retractable-roof spatial structure, it can be used as a reference in the TMD design for large space structure.

In this study, TMD(Tuned Mass Damper) is installed in a retractable-roof spatial structure in order to investigate dynamic response characteristics according to mass ratio and installed position of TMD on large spatial structures. The example analytical model is generated based on the Singapore sports hub stadium. Twenty eight analytical models are used to investigate optimal installation position of TMD for the example retractable-roof spatial structure using 4 to 16 TMDs. The mass of one TMD is set up 1% of total mass at the example analytical model. Displacement response ratio of model with TMD is compared with that of base model without TMD. It has been found from numerical simulation that it is more effective to install TMD at the edge of the spatial structure rather than to concentrate the TMD at the center of the spatial structure.

본 연구의 목적은 강성 개폐식 대공간 건축물의 비정형 입체트러스를 파라메트릭 기법을 적용하여 모델링을 구현하는데 있다. 개폐식 대공간 건축물은 비선형성 형상을 모델링하거나 다수의 모델을 대안별로 생성, 해석, 검토하는 과정에 많은 시 간과 기술이 소요되는 것이 현 실정이다. 이러한 문제점을 해결하기 위해서 첫째로, 개발에 사용된 파라메트릭 모델링 전산 도구를 소개하고, 강성 개폐식 대공간 건축물의 비정형 입체트러스를 분석하며, 개발한 입체트러스의 파라메트릭 컴포넌트 로 모델링을 구현하게 된다. 따라서 지붕이 개폐되는 방식으로 구분한 입체 트러스 종류의 모델링을 구현해 낼 수 있는 컴포 넌트를 형상이나 기능에 따른 각각 대안별로 개발하여 효율적인 개폐식 지붕의 모델링을 가능하게 하는 것이 추후 연구사항 이다.

In this paper, a structural design method of a smart tuned mass damper (TMD) for a retractable-roof spatial structure under earthquake excitation was proposed. For this purpose, a retractable-roof spatial structure was simplified to a single degree of freedom (SDOF) model. Dynamic characteristics of a retractable-roof spatial structure is changed based on opened or closed roof condition. This condition was considered in the numerical simulation. A magnetorheological (MR) damper was used to compose a smart TMD and a displacement based ground-hook control algorithm was used to control the smart TMD. The control effectiveness of a smart TMD under harmonic and earthquake excitation were evaluated in comparison with a conventional passive TMD. The vibration control robustness of a smart TMD and a passive TMD were compared along with the variation of natural period of a simplified structure. Dynamic responses of a smart TMD and passive TMD under resonant harmonic excitation and earthquake load were compared by varying mass ratio of TMD to total mass of the simplified structure. The design procedure proposed in this study is expected to be used for preliminary design of a smart TMD for a retractable-roof spatial structure.

A retractable-roof spatial structure is frequently used for a stadium and sports hall. A retractable-roof spatial structure allows natural lighting, ventilation, optimal conditions for grass growth with opened roof. It can also protects users against various weather conditions and give optimal circumstances for different activities. Dynamic characteristics of a retractable-roof spatial structure is changed based on opened or closed roof condition. A tuned mass damper (TMD) is widely used to reduce seismic responses of a structure. When a TMD is properly tuned, its control performance is excellent. Opened or closed roof condition causes dynamic characteristics variation of a retractable-roof spatial structure resulting in off-tuning. This dynamic characteristics variation was investigated. Control performance of a passive TMD and a smart TMD were evaluated under off-tuning condition.

지붕구조의 개폐가 가능한 체육시설 및 복합시설은 대공간구조물의 장점을 잘 나타내고 있으며 대공간구조물의 전천후 사용이 가능하도록 하였다. 개폐식 지붕구조는 구조형식, 마감재료, 개폐방식에 따라서 매우 다양하며 개폐방식에 따라서 중첩방식, 수평이동방식, 주름접기방식 등으로 구분할 수 있다. 특히 중첩방식이나 수평이동방식에 의한 지붕구조의 움직임은 주행하중, 충격하중, 관성력 및 제동력과 같은 동적하중이 구조물에 가해질 수 있으므로 이에 대한 대공간구조물의 진동해석이 필요할 것으로 사료된다. 지붕구조의 움직임에 의한 주행하중은 이동질량 또는 이동하중으로 적용할 수 있으나 비교적 움직임이 느린 개폐식 지붕구조에 의한 동적하중은 아동하중으로 적용하는 것이 타당하다. 따라서 본 논문에서는 지붕구조의 개폐로 야기되는 이동하중에 대한 새로운 적용방법을 제안하고 이를 이용하여 개폐식 지붕의 개폐속도에 따른 대공간구조물의 진동해석을 수행하였다. 본 논문에서 제안된 등가 이동하중은 지붕구조 개폐에 의한 대공간구조물의 진동해석에 있어서 매우 용이하게 활용할 수 있다.

From the past, space structure have been widely used as sports arenas, religious facilities. And the demand and research for retractable structure is increasing recently. Therefore, we classify the retractable mechanism which is divided according to the retractable method of structures and survey the present condition of retractable structures built around the world.