In this study, we propose a new truss deckplate system, which does not require temporary floor supports during construction, with ultra-high-performance concrete (UHPC) infilled top bars. The increased stiffness and strength of the proposed system were well retained as compared to those of the existing truss deckplate systems, thereby resulting in the reduction of maximum deflection at the span center. Four-point bending tests were performed on five specimens with a net span of 4.6 m to evaluate the structural performance of proposed system in the construction stage. In addition, the load-deflection curve was plotted for each specimen, and the effects of test parameters were analyzed. Further, a rigorous nonlinear three-dimensional finite element analysis was performed, and its results were compared with the test results. From the results, it was observed that the test specimens of the proposed system exhibited superior performance as compared to those of the existing one and also satisfied the serviceability requirement during construction provided by the Korea Building Code 2016.

Recently, a market of architecture is requiring buildings of long spanned structures as most buildings become taller and larger. For being long spanned structures, elements of buildings must be light. As an alternative proposal, various hollow-core slabs and flat plate salbs were developed and used frequently in the inside and outside of the country. But the study of the hollow-core slabs using deck plate and assembly of light weight is the first. In the present study, Flexural and vibration tests were performed on the hollow-core slabs using deck plate and assembly of light weight to investigate the flexural behavior and serviceability. Four test specimens were used for test parameters; one hollow-core slab with an assembly of light weight, and three hollow-core slabs with deck plate and an assembly of light weight. The test parameters also included amount of tension bar and existence of shear reinforcement. The test results showed that the hollow-core slabs with deck plate and an assembly of light weight had a crack of shear, so shear reinforcement must be conducted.

To improve the shear bonding capacity of deckplate and concrete, we retrofit shape of 150 TU deck and performed fire resistance test. Fire resistance test results show 90 minutes fire resistance capacity for 6kN/m2 live load condition.

일체형 삼각 트러스 형태의 철선을 아연도금 강판에 용접한 철선일체형 데크 플레이트는 슬래브 시공 시 현장시공 최소 및 동바리와 지보공 등 거푸집 공사비 절감을 목적으로 개발되어 이미 많은 현장에 적용되고 있다. 본 연구에서는 철선일체형 데크 플레이트 시스템의 구조성능 평가를 위해 상부철선, 하부철선, 래티스 철선, 경간, 단부가공방법을 변수로 채택하여 총 32개의 시험체를 실물크기로 제작하여 실험적 연구를 수행하였다. 연구결과 시험체의 최종파괴형태 변화 및 단부가공방법이 시험체의 구조 성능에 영향을 미치지 않는 것으로 나타났으며, 경간 3.2m 시험체는 래티스 철선으로 Φ4.5를 사용해도 큰 무리가 없는 것으로 나타났다.