Žํ•ส ˜_•ถ
Žๅ‘่ Evaluation of Bridge Outflow due to Great Tsunami
•›‘่
•M“ช’˜Žา “A‹ส—ดi‹ใBH‹ฦ‘ๅŠwj
˜A–ผŽา1 KถŒซ“๑i‹ใBH‹ฦ‘ๅŠwj
˜A–ผŽา2 ฒX–ุ’Bถi‘ๅ“๚–{ƒRƒ“ƒTƒ‹ƒ^ƒ“ƒgj
˜A–ผŽา3
˜A–ผŽา4
˜A–ผŽา5`
ƒL[ƒ[ƒh ’ร”gA‹ด—ภ‚ฬ—ฌŽธAR—อŒW”Aƒภ’lAtsunamiAbridge outflowAdrag coefficientAratio ƒภ
Šช 35
† 2
ๆ“ชƒy[ƒW 841
––”๖ƒy[ƒW 846
”N“x 2013
—vŽ| Triggered tsunami from the Great East Japan Earthquake caused outflows of many bridges. ƒภ (ratio of girder resistance to tsunami impact) of 38 girders were evaluated. There is great difference between ƒภ of girders flowed and survived. From modifications using average drag coefficient, ƒภ have 20% increase. After revising, flowed bridges with ƒภ greater than 1.0 are located in smaller distance to coastal line inducing greater velocities and decrease of ƒภ. As representative, ƒภ of Koizumi Bridge was modified by velocity by numerical analysis and becomes sufficient to explain the outflow.
PDFƒtƒ@ƒCƒ‹–ผ 035-01-2141.pdf


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