BASIC PRINCIPLES AND DESIGN GROUND MOTIONS IN SEISMIC RETROFIT DESIGN OF LARGE CABLE-SUPPORTED BRIDGES ON THE TOKYO METROPOLITAN EXPRESSWAY

KOMORI Kazuo, KIKKAWA Hiroshi, ODAGIRI Naoyuki, KINOSHITA Takuo, MIZOGUCHI Takao, FUJINO Yozo, YABE Masaaki

doi:10.2208/jscej.2005.794_1

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首都高速道路における長大橋耐震補強の基本方針と入力地震動
技術展望首都高速道路における長大橋耐震補強の基本方針と入力地震動
ギジュツテンボウシュトコウソクドウロニオケルチョウダイキョウタイシンホキョウノキホンホウシントニュウリョクジシンドウ

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Abstract

For the Yokohama Bay Bridge, Rainbow Bridge and Tsurumi Tsubasa Bridge, the basic principles were developed for seismic assessment for level-2 ground motions and for selection of seismic retrofit structures. Level-2 ground motions were defined for seismic assessment. For level-2 ground motions, plate boundary earthquakes with magnitude of 8 and near-field inland earthquakes with magnitude of 7 were assumed. The strong ground motions of plate boundary earthquakes with magnitude of 8 were defined based on the source model of the 1923 Kanto Earthquake. The asperity size and those locations were determined so that the ground motions were composed of numerous periods identical to the natural periods of major normal modes of vibration of the bridges, and that rupture was propagated toward the location of the bridge. For the ground motions of near-field inland earthquakes with magnitude of 7 in the Tokyo metropolitan area, the ground motions of the 1995 Hyogo-ken Nanbu Earthquake, the highest existing criteria, were adopted.

Journal

Doboku Gakkai Ronbunshu

Doboku Gakkai Ronbunshu 2005 (794), 794_1-794_19, 2005

Japan Society of Civil Engineers

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