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Precast Concrete Slab in Highway Bridges
Kim, Yong Hee,Matsui, Shigeyuki,Kim, Yoonchil 慶南大學校 附設 工業技術硏究所 1998 硏究論文集 Vol.16 No.-
최근, 일본에서는 교량구조물의 시공비용을 절감하기 위하여 조립을 간편화시키는 합리적인 구조물 시공을 시도하고 있다. 이러한 방법의 하나로 교량의 바닥판을 프리캐스트 프리스트에스트 바닥판(PC slab)으로 제작하여 주 바닥판의 이음부는 종방항 강재를 사용하지 않고 그라우팅 만으로 연결하였다. 또 잭킹업과 잭킹다운을 연속적으로 작용시켜 바닥판의 내구성을 향상시켰다. 본 연구에서는 시험체 바닥판을 제작하여 주행시험기를 써서 이음부의 정적시험을 행하고 또 파괴강도를 실험으로 측정하였다. Recently, rationalization has been required in the construction of highway bridges in order to reduce construction costs and to create a simplified fabrication bridge system in Japan. Taking this into consideration, the rampway bridges on the WANGAN route at Osaka Nanko are under construction by Hanshin Expressway Public Corporation. These bridges are continuous girder bridges with two main girders with spacing of 4.2m and precast concrete slabs, which are prestressed in transverse direction. The joints of precast slabs use only grout without longitudinal reinforcement bars, and precast slabs are prestressed in longitudinal direction using a sequential jacking-up and jacking-down method in order to connect longitudinally and to improve the durability of precast concrete slabs including their joints. This new method is very useful in adopting precast slabs, because longitudinal prestressing scan be performed easily, jacking-up and jacking-down each intermediate support in sequence. The paper will describe the rational design and construction method in these rampway bridges, and the experimental studies on this prestressing method, on the static and fatigue strength of joints.
Masato Yoshihara,Hiroaki Kajiyama,Satoshi Tamauchi,Shiro Suzuki,Kunihiko Takahashi,Shigeyuki Matsui,Fumitaka Kikkawa 대한부인종양학회 2019 Journal of Gynecologic Oncology Vol.30 No.6
Objective: The aim of this study was to investigate the clinical characteristics of youngpatients with stage I clear-cell carcinoma (CCC) and evaluate the prognostic factors andeffects of fertility-sparing surgery (FSS) using propensity score (PS) adjustment. Methods: We conducted a regional multi-institutional study between 1986 and 2017. Among4,277 patients with ovarian tumor, clinical and pathological data of 103 fertile women withstage I unilateral CCC were collected. We evaluated survival and reproductive outcomesin these patients. Additionally, to analyze the effects of FSS, baseline imbalance betweenpatients with and those without FSS was adjusted with an inverse probability of treatmentweighting using PSs involving independent clinical variables. Results: The mean patient age was 39.4 years, and the median follow-up period for survivingpatients was 55.6 months. In multivariate analysis, stage IC2/IC3 (vs. IA/IC1) was the onlyindependent prognostic factor for recurrence-free survival (RFS) and overall survival (OS). FSS was not associated with poorer prognosis when compared to the prognosis with nonpreservingsurgery with regard to both RFS and OS. No statistical difference in survivaloutcomes between FSS and other approaches was confirmed after PS adjustment. Amongpatients who underwent FSS, four deliveries with healthy neonates were noted without anygestational complications. Conclusion: FSS can be considered in stage I CCC, specifically in stage IA and IC1 patientswho strongly desire to have children in the future. Further clinical research is needed toclarify the optimal application of FSS for CCC.