LIU Yuqing Kyushu University, Department of Civil and Structural Engineering, Research Associate, 大学院・工学研究科, 助手 (40284533)
松下 博通 九州大学, 工学部, 教授 (10038036)
SONODA Yoshimi Kyushu University, Department of Civil and Structural Engineering, Associate Professor, 大学院・工学研究科, 助教授 (40304737)
|Budget Amount *help
¥6,200,000 (Direct Cost : ¥6,200,000)
Fiscal Year 1999 : ¥1,600,000 (Direct Cost : ¥1,600,000)
Fiscal Year 1998 : ¥1,500,000 (Direct Cost : ¥1,500,000)
Fiscal Year 1997 : ¥3,100,000 (Direct Cost : ¥3,100,000)
Old stone arch bridges in Japan are ,as well as those in European countries, historical landmarks and excellent reminders of the civil engineering heritage. Big difference of situations, however, that masonry arch bridges from an important part on the highway network in some European countries, whereas they don't at all in Japan. There are about 40000 brick or stone masonry arch bridges in the United Kingdom, representing about 40% of the bridge stock ; of about 59000 bridges in France with a span of 5 m at least, 60% are masonry bridges. Japan has approximately 122 thousand highway bridges presenting a length exceeding 15m, however only 0.3% (369 in number) are stone masonry arch bridges. The history of stone arch bridge in Japan is also very new compared with that in Europe ; the first stone arch bridge in Japan was built in the mid-17th century by a Chinese monk, while six of the eight stone bridges the Roman built over the Tiber between 200 B.C and A.D. 260 still stand.
and 1849 a series of five multi-span stone-masonry arch bridges was built in Kagoshima City, Japan, and they carried roadway traffic till quite recently. Each bridge had four or five circular arches giving a total length of 45 to 70m. In August,1993, two of these 150-year-old bridges were swept away due to scour around the piers during a storm flood. In order to execute the river conservation works and to avoid the possible future loss of the cultural built heritage, the authorities decided to relocate the three surviving bridges to a safe site. Prior to the relocation, comprehensive material tests were performed to establish the condition and quality of the original stones. The size, depth, type and condition of the original foundations were also confirmed. The nonlinear static behavior of multi-span stone arch bridges was predicted considering the discontinuity of each masonry element. The soil-structure interaction under a severe earthquake was also assessed by 2-D finite element method.
2.一方、大寸法の実構造物では、非均質材料をマクロスコピックに等方性均質材料と見なし、構造解析と破壊力学的考察を行った。これらの成果を、土木学会構造工学論文集Vol.43A(1997年),Engineering Computations Vol.15,No8(1998年),土木学会論文集No.627(1999年)に発表した。
3.古い石造アーチ橋を個別の石材ブロック要素からなる不連続体として扱い、石材の変形および強度特性を要素境界面の分布バネに集約させる非線形解析モデルを提案した。これらの成果を、土木学会構造工学論文集Vol.43A(1997年)及びProc.8th International Conference on Structural Faults and Repair,London(1999年)に発表した。 Less