橋梁含多重防落裝置之極限狀態動力分析; Dynamic Analysis of Ultimate State for Bridges with Multiple Unseating Prevention Devices

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题名:	橋梁含多重防落裝置之極限狀態動力分析;Dynamic Analysis of Ultimate State for Bridges with Multiple Unseating Prevention Devices
作者:	蘇德絲;Desy Setyowulan
贡献者:	土木工程研究所
关键词:	動力分析;阻尼;橋梁;防止落橋裝置;向量式有限元素;極限狀態;ultimate state;bridge;unseating prevention device;vector form intrinsic finite
日期:	2010-08-16
上传时间:	2010-12-08 13:35:59 (UTC+8)
出版者:	國立中央大學
摘要:	過去發生嚴重震害之大地震中，經常可見橋梁亦遭受嚴重之損害，橋梁震害中，橋柱損壞與落橋所造成之損失更為嚴重。因此本研究主要探討橋梁含多重防止落橋裝置於大地震時之功效，同時研究外加阻尼裝置是否可提高橋梁之耐震能力。本研究採用新近發展之向量式有限元素為結構動力分析方法，向量式有限元素適用於處理大變形、大變位、材料非線性與剛體運動等問題，由於橋梁在大地震中，防止落橋裝置方開始作用，此時橋梁動力行為不再處於線彈性階段，為研究防止落橋裝置之功效則必須進行橋梁非線性動力分析甚而預測極限破壞狀態。本研究以一座六跨簡支橋梁與一座二單元三跨連續橋梁為目標橋梁，防止落橋裝置包括抗拉型防落拉桿與抗壓型制動箱，經數值分析結果，多重防止落橋裝置無法提高橋梁耐震能力，但連續橋之耐震能力高於簡支橋，同時外加阻尼裝置可適度提高橋梁耐震能力。 In earthquake-prone areas, a bridge is unavoidably attacked by an earthquake which has been noticed as the most frightened and destructive phenomenon of Nature. Observed from the damaged bridges, column failure and deck unseating caused a more serious loss. The purpose of this study is to clarify the effectiveness of multiple unseating prevention devices for bridges by numerical simulations. Supplementary dampers are included in bridges to improve the seismic capacity under strong earthquakes. The Vector Form Intrinsic Finite Element (VFIFE) is superior in managing the engineering problems with material nonlinearity, discontinuity, large deformation, large displacement and arbitrary rigid body motions of deformable bodies. In this study, the Vector Form Intrinsic Finite Element (VFIFE) is thus selected to be the analysis method. Two types of bridges, a six-span simply-supported bridge with rigid bearings and a continuous bridge with rigid bearings, are analyzed. The hook and gap spring elements with fracture strength are used to simulate the behavior of restrainers and stoppers, respectively. The Maxwell model is developed to simulate the behavior of supplementary viscous dampers. From the numerical analysis, it is found that installation of multiple unseating prevention devices and supplementary dampers lead columns to collapse earlier. The performance of the continuous bridge with rigid bearings is better than simply-supported bridge to prevent unseating of the superstructure.
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