ࢪ 1㸭8 ᾷ ᾷᕝᶫᶓ᱆࠾ࡧ⦪᱆➃㒊ࡢᐇാᛂຊィ Stress Measurements on Transverse Beams and Longitudinal Beams End of the Yodogawa Bridge ۑ℩ Ꮚ㺷㺐㺙㺼 ኟ⛅ ⩏ᗈ ቑ⏣ ᐶᅄ㑻 ᆏ㔝 ᘯ Luiza H. ICHINOSE Yosihiro NATSUAKI Kanshirou MASUDA Masahiro SAKANO 㸯㸬 ࡌࡣ 1926 ᖺᯫタ ࡉ ࡓᾷᕝᶫ ࡣ㸪ᖜဨ 20.8m㸪ᶫ㛗 723.3m ࡢ30 ᚄ㛫ࡢᶫᱱ࠶㸬 2005 ᖺࡢㄪᰝࡣ㸪ᮏᶫᱱࡢ㏻㔞 ࡣ20,000 /12 㛫㉸࠼㸪ᆺ㌴ΰධ⋡ ࡀ12.7% ࠶ࡇࡀグ㘓ࡉ࠸㸬౪⏝ 80 ᖺ㉸ ࡓ࠼ᾷᕝᶫࡢ㛗ᑑ┠ⓗࡋ㸪ᖹᡂ 22 ᖺ ࠕ㧗㱋㏄ࡓ࠼㛗ᶫᱱࡢデ㛗ᑑ 㛵ࡍ◊✲ࢪࢺࢡࡢ⎔ࡋ 㐃⌧ࡢᆅㄪᰝ 1)㹼7) ᐇࡋࡓࡁ㸬 ᾷᕝᶫࡢ୰ኸ㒊 ࡢ6 ᚄ㛫ࡣ㸪㧗 ࡉ4.0m㸪 ᨭ㛫 32.918m ࡢ㊰ᘧ㗰༢⣧ࢺࢫᶫᵓᡂ ࡉ㸪ࡢࡑᗋ⤌ࡢ⦪᱆ᶓ᱆ࡢ᥋㒊」 ࡢࡁࡀ㐣ཤࡢㄪᰝ☜ㄆࡉ࠾㸪⥭ᛴᛶ ࡢ㧗⟠࠸ᡤ࠸ࡘࡣᖹᡂ 24 ᖺᗘ⿵ಟᕤ ࡀᐇࡉࡓ㸬ࡢࡑᖺ୰ኸ㒊 ࡢ6 ᚄ㛫ࢺࡢ ࢫᶫᑐ㇟ࡋᶓ᱆⦪᱆ࡢ᥋㒊ࡢ⟠ᡤ ࡁடࡢㄪᰝࡀᐇࡉࡓ㸬ㄪᰝᑐ㇟ ࡓࡗ࡞㊰ᘧ㗰༢⣧ࢺࢫᶫࡢഃ㠃ᅗ࠾ࡧ㠃ᅗ ᅗ㸫㸯♧ࡍ㸬 ᮏ✏ࡣ୰ኸ㒊 ࡢ6 ᚄ㛫ࡢ㊰ᘧ㗰༢⣧ࢺ ࢫᶫࡢᗋ⤌ᵓᡂࡍ⦪᱆ᶓ᱆ࡢᣲ╔┠ ࡋᐇࡓࡋⓗ㍕Ⲵヨ㦂࠾ࡧᛂຊ㢖ᗘ ᐃ ࠸ࡘሗ࿌ࡍࡢ࠶㸬 ሗ࿌ ABSTRACT As a result from a series of site measurements and inspections carried out with the objective of evaluating the structural health on an 85 years old truss bridge, repair works were executed at locations having inadequate structural details, defective welding or cracks. After detailed inspections at the longitudinal-to-transverse beam connections, dynamic loading test and stress measurement under traffic load were carried out to investigate the structural behavior of the transverse beams and longitudinal beam ends. Considerations on fatigue life were also made. Keywords: ⓗ㍕Ⲵヨ㦂㸪ᛂຊ㢖ᗘ ᐃ㸪⑂ປᑑ㸪⦪᱆ᶓ᱆᥋㒊㸪ࢺࢫᶫ Dynamic loading test, stress measurement, fatigue life, longitudinal-to-transverse beam connection, truss bridge ಟኈ㸦ᕤᏛ㸧 㸦♫㸧᪥ᮏ㠀◚ቯᰝᕤᴗ㸦 ᮾி㒔༓௦⏣༊ෆ⚄⏣ )㸧 ᕤ༤ 㸦♫㸧᪥ᮏᶫᱱᘓタ༠ 㸦 ᮾி㒔 ༊す᪂ᶫ )㸧 ≉ဨ ᕤಟ ᅜᅵ㏻┬㏆␥ᆅ᪉ഛᒁ㸦 㜰ᕷᇛᮾ༊⚟す 㸧 ᕤ༤ 㛵すᏛ⎔ቃ㒔ᕷᕤᏛ㒊 㸦 㜰ᗓ྿⏣ᕷᒣᡭ⏫ 㸧 ➨ ✀ṇဨ ᅗ-1 ༢⣧ࢺࢫᶫ - 1 -