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Title The 20mm-thick blast protective panel, PROTECT (Poly Resilience-Oriented hybrid TEChnology plaTe),
which can substitute 100mm-thick concrete
(방폭 두께 100mm 콘크리트를 대체하는 두께 20mm급 PROTECT 방폭 패널 개발)
Summary The PROTECT Panel is a kind of explosion-proof panel to reinforce column members. The panel may make thickness of reinforcement far slender than using reinforced concrete. It consists of elastomer and checkered steel plates and those compose a sandwich. Importantly, uneven surface of checkered plate makes adhesive area with elastomer larger and the panel integrated. In this research, FEM analysis and impact resistance test will be conducted to estimate the dissipation capacity of the panel.

Title Commercialization technology of Hybrid Damper for the structure safety of disaster risk
(재난위험시설물 구조안전을 위한 Hybrid형 댐퍼 실용화 기술)
Summary - Establishment of structural safety, applying 'Hybrid Damper' on reinforced concrete structure in terms of earthquake load

- Minimizing structural damages come from seismic load on concrete structures through application of 'Hybrid Damper'
   - Development of anchoring detail and analysis method to make structure and the damper integrated.

- Development of optimized construction technology of 'Hybrid Damper', which is able to be reinforced for a short time for    usability of the structure.

Title Development of Seismic Performance Evaluation Method for Diagrid
(다이아그리드 구조의 성능기반 내진계수 평가 방법 개발)
Summary The purpose of this research is to development a new Diagrid structural system for Tall Buildings. The evaluation of seismic performance of the Diagrid system was proposed by parametric studies, experimental and analytical studies are presented to improve the node connection reinforcement and the connection details. Design guidelines of the system for seismic performance of the Diagrid system were evaluated to improve a conventional IDA(Incremental Dynamic Analysis) method.

Title Design and construction technologies of underground columns using the 1000ton class HAT Joint
(1000ton급 반구형(HAT Joint)를 이용한 지하구조물용 기둥 설계 및 시공 기술)
Summary To overcome disadvantages of usual Cast-In-Place(CIP) concrete pile methods in top-down or up-up construction, some prototypes of a joint between PHC pile and column are analytically studied. We used FEM analysis program(ABAQUS) to find optimal shape. With the consideration of strength requirement and stress concentration of joint of the PHC pile to column, we suggest the most appropriate prototype. The new Joint is named HAT(Hollow hAlf-sphere sTeel) Joint, that can be transfer load for only compression. We did structure performance test for check with analysis results. After develop the new joint, it had constructed instead of CIP pile for Pilot Project. Usual construction method like CIP pile should have some time for curing basement. But HAT Joint can help construct upper area before curing. It can be effective way for reduce construction period, and cost.

Title Hemisphere-Shaped Iron Joint between PHC Pile and Steel Reinforced Concrete Column.
(지하구조물에 강관 적용 확대를 위한 중공형 PHC파일-강관기둥 접합부)
Summary When usual Cast-In-Place (CIP) concrete pilε methods arε used to top-down construction, such as PRD (Percussion Rotary Drill), RCD (Rεverse Circulation Drill), and All casing method, largescale construction storage yard, curing periods of concrete material (elongates a construction period), and using stabilizer liquid harmful to environment are inevitable. Also, it is hard to guarantee a uniform construction quality of concrete piles. To use PHC piles in top-down construction, which can overcome disadvantages in using CIP concrete piles, a design of a joint that connects a PHC pile to a column is the most critical. In particular, the joint of the PHC pile to column properly transfers the axial stress from a column to a PHC pile without punching shear effects and stress concentration. Also, local large strains at the joint of the PHC pilε to column must be prevented to have adequate rigidity betwεen a column and a PHC pile. In this paper, we firstly develop 16 prototypes of joint of the PHC pile to column from basic domed-shape geometry, which is advantageous in saving materials compared to an archshaped joint of the PHC pile to column under compression. With the commercial software ABAQUS, structural behaviors of each prototype are analytically investigated for the worst case, which is under compression load of 1.5 times a capacity of a PHC pile (Diameter 1000mm pile’saxial strength is 967tonf[5], so we compressed 1500tont). Based on the analytical results we studied, the most effective prototype is suggested for the further experimental study.

Title High-Performance Structures: Corrugated Web Beams
(Corrugated 철골보의 휨 성능 평가)
Summary Because out-of-plane stiffness and shear strength of the Corrugated Web geometrically has better than general steel plate like [Fig 1], Corrugated Web can skip a vertical reinforcement , use thin web, reduce construction period and make light-weight building. Although it has great benefit, there is poor research in architecture structure field. So we had a research for internal force of steel beams used corrugated web for production and commercialization of it.

Title 4L Parking Building System Development
Summary Public parking lot which is included in structure, not a building legally, has a a height limit. So if we build columns over 8m, we can not satisfy the height limit because of increase depths of beam. For this reason most public parking lots are limited to an interval of 8m columns. Because they have only 8m module, there are so many columns inside the parking lot, which lowers efficiency in parking space. 4L Parking Building System developed to improve this problem decreases 바닥 하중 and makes it possible to place columns with intervals of over 17m by using post-tension without increase in depth of beam. Using previously utilized steel deck(steel composite floor deck) or composite slab(SPS, sandwich panel system) using synthetic resins, it decreases floor self-weight and amount of steel frame. Also SPS solves leaks and noise problem occurred in steel deck by using welding connect or precise bolting connect.

Title (탄소배출 총량(Carbon Footprint) 저감을 위한 교육시설 내진보강용 SAFE 댐퍼 개발)
Summary Although lateral force resistant system in medium and low-rise buildings is generally determined by seismic load, buildings have to obtain moderate stiffness at working load levels even if damper is applied with the purpose of seismic response control. And achievement of performance in various strengths of seismic behavior is necessary because the concept of performance based design will be introduced to domestic design criteria. Hybrid SAFE damper designed with this background improves stiffness of buildings under working load such as wind load and in the case of seismic load, friction damper and steel strip dampers operate by stages according to the level of required performance. In this research, performance experiment is conducted to evaluate gradual behavior of the proposed hybrid damper.

Title Finite Element Analysis for the Development of Node of Single Layered Freeform Structure (제로 에너지 건축 구현을 위한 삼각형 셀 구조 개발)
Summary Due to architectural requirement, the attention of single layered freeform spatial structure is increasing nowadays. Because the node of single layered structure should resist the bending and axial forces simultaneously , it is necessary to develop a new proper type of node in detail. In this study, a new type of node for single layered freeform spatial structure was proposed. And the structural performance for the node was analytically evaluated using the commercial FEM software(ABACUS). As a result , a node prototype was selected and the proposed node showed good structural behaviors.

Title (건설에너지 저감형 ES2 시스템 개발)
Summary Merits of SRC column which are used frequently for buildings are energy saving for construction, improvement of construct ability, convenience of erection and shortening of construction period. Despite the many advantages, SRC column has difficulty in integration because it uses composite material such as steel and concrete. Also SRC makes construction complicated by additional process. To solve the problem, a new concept of high strength composite column system that keeps the advantages and make up for the weakness of SRC column is necessary. This research develops details of ES2(Energy Saving Structural) column system that combines fabrication factory concrete(PC) and cast-in-place concrete(RC) by replacing steel part of SRC column with PC and verifies structural 내력 experimentally. Also we performed development of joint and steel beam to apply ES2 column system in construct field.

Title Development of Green Floor to decrease CO2 (CO2 저감을 위한 Green Floor 개발)
Summary In Korea, there has been little research on structural system using environment-friendly new material that can substitute for existing structural material. In other countries, it is limited to apply to buildings universally. After the 2000s, R&D investment costs in architectural field are 350 billion won. However, considering that scale of construction market is more than 10 trillion won, the ratio of R&D investment is only 0.3%. So increase in investment and continuous study that can be applied to actual building are necessary. Therefore, goals of this research are development of prototype of Green Floor, development of joint with steel frame and structural performance evaluation.

Title Buckling Restrained Brace For Diagrid Structural System (초대형대각가새구조 좌굴구속가새 개발)
Summary To develop the buckling resistance of the main brace for the diagrid structural system which can be adopted for the recent tall buildings, new buckling restrained brace for the diagrid system will be proposed and verified by the test and analysis. A numerical analysis model of the diagrid BRB structural system is proposed and it is compared with the result of the frame test to evaluate the efficiency of the analysis model and structural performance of Diagrid BRB depending on the size of the tube’s slot-hole, a joint detail used for frame experiment is evaluated using finite element analysis.