橋梁結構考量地震與洪水之多重災害研究-子計畫:橋梁考慮碰撞效應之極限狀態分析與設計(II);Analysis and Design of Bridges with Pounding in Ultimate States

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Title:	橋梁結構考量地震與洪水之多重災害研究-子計畫:橋梁考慮碰撞效應之極限狀態分析與設計(II);Analysis and Design of Bridges with Pounding in Ultimate States
Authors:	李姿瑩
Contributors:	土木工程學系
Keywords:	bridge;pounding effect;ultimate collapse;seismic design;numerical analysis;scour;debris flow;structural control;研究領域：環保工程
Date:	2011-08-01
Issue Date:	2012-01-17 17:22:07 (UTC+8)
Publisher:	行政院國家科學委員會
Abstract:	性能設計為世界先進國家耐震設計之新趨勢，雖然性能設計之性能規定或目標易於瞭解，但是如何驗證所設計之橋梁是否符合性能目標，目前仍為極待解決之課題。台灣近十年來遭受地震、洪水、土石流破壞之橋梁眾多，目前仍有許多服務中橋梁已遭受洪水沖刷或土石流淤積，其結構系統特性已改變，是否足以承受未來可能來襲之大地震為待解決之課題。此外，根據過去震害調查報告，嚴重震害橋梁均可發現碰撞痕跡。本研究團隊近年來致力於結構控制與向量式有限元素法之研究，已成功發展適用於結構非線性地震反應控制之滑模變結構控制演算法與模擬預測橋梁極限崩塌狀態之數值分析方法。今將以現有研究成果為基礎，以洪水沖刷或土石流淤積橋梁與具坡度橋面橋梁為對象，繼續擴充發展極限狀態數值分析方法與非線性結構控制技術。研究將以極限破壞觀點，探討極大地震下，考慮碰撞效應，具坡度橋面橋梁與受洪害橋梁之耐震能力與極限破壞模式，並瞭解橋梁各構件之破壞順序。配合數值分析結果，研究具坡度橋面橋梁考慮碰撞效應之支承設計與防止落橋裝置設計，另運用結構控制方法結合最佳化搜尋方法，提昇受洪害橋梁之耐震能力，並以極限狀態分析驗證結構控制之效果。Lately, modern bridge seismic design has been developed toward the seismic performance design on entire bridges as well as components thereof. Although it is easy to understand the performance regulations or goals in performance-based design, it is still an open issue if a bridge can achieve the performance goals under ultimate situation. In the past decade, a number of bridges suffered damage even collapse due to earthquakes, floods or debris flows in Taiwan. Some damaged bridges are still in service. Actually, the structural properties of these bridges which suffered from scouring or debris flows have changed with the change of the clear height of the piers. Therefore, it is also an open issue if these bridges can survive when the next extreme earthquake occurs. Recently, we have successfully developed the structural control technology by using sliding mode control for reducing the nonlinear behavior of structures under large earthquakes and the numerical analysis method by using Vector Form Intrinsic Finite Element (VFIFE) for simulating and predicting the ultimate condition of bridges under extreme ground motions. Based on the results, the ultimate analysis method and the structural control technology will be continuously developed to be applied to the bridges suffered from scouring or debris flows as well as the bridges with inclined decks. From the viewpoint of ultimate collapse, it is aimed to study the seismic performance and the ultimate failure mode of the target bridges with pounding effects and to clarify the failure sequence of the structural components, such as bearings, columns, and unseating prevention devices. According to the results of numerical simulations, the design of bearings and unseating prevention devices of bridges with pounding effects will be investigated. In addition, a hybrid optimum searching algorithm will be utilized to obtain the optimum parameters of the sliding surface in the sliding mode control. It is expected to further improve the seismic performance of the floor-damaged bridges. Finally, the effectiveness of the structural control will be examined through the developed ultimate numerical analysis method. 研究期間：10008 ~ 10107
Relation:	財團法人國家實驗研究院科技政策研究與資訊中心
Appears in Collections:	[Department of Civil Engineering] Research Project

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