橋梁配置防震拉桿之非線性動力分析及設計

Nonlinear Dynamic Analysis for Bridges with Restrainer

方嘉宏(Cha-Hung Fang)

指導教授 ： 蔡益超

國立臺灣大學/工學院/土木工程學研究所/碩士(2005年)

https://doi.org/10.6342/NTU.2005.00500

摘要

本研究主要是著重在防震拉桿於非線性動力分析下對整體橋梁結構反映之貢獻，並藉由非線性分析之結果，提出一個可行之防震拉桿分析流程。
地震歷時採用保留相角與修正傅氏震幅譜之方式，求得符合規範第三類地盤反應譜之人造地震歷時，並進行三筆非線性動力分析。另本論文亦考慮防震拉桿及橋柱之非線性行為，探討兩者進入非線性時對整體橋樑之影響，包括防落長度檢核，碰撞效應，韌性比，振動特性以及內力再分配之可能性。而防震拉桿依其參數變化共24種不同性質，考慮非線性動力分析後之結果，修正美國加州公路局對防震拉桿之設計流程，提出一套考慮橋梁非線性行為之設計流程，並訂定出使用之條件假設及限制，做為工程師設計防震拉桿之依據。

關鍵字

防震拉桿 ； 諧和反應譜之人造地震 ； 非線性動力分析 ； 富氏震幅譜 ； 韌性比 ； 防落長度

並列摘要

The study focuses on the contribution of bridges with restrainers that consider nonlinear behavior of each pier and restrainers. Based on the results from nonlinear dynamic analysis, we can obtain a reasonable design procedure.

For nonlinear dynamic analysis, each using time history is simulated from keeps phase spectrum and modifies Fourier amplitude. There are three original ground motion are used in the study. So the spectrum compatible design ground motion can be determined for nonlinear dynamic analysis. For handle the responses of restrainer exactly, we use 24 cases from change parameters of restrainer.

Besides the classification of restrainers, we also consider nonlinear behavior about restrainer and pier in bridge structure. That includes check the available seat width, impact event, ductility, force-redistribution. Based on the results from nonlinear dynamic analysis, the method of caltrans can be correction and set up a more reasonable design procedure and some limits and assumptions for the procedure bring out, too.

並列關鍵字

Restrainer ； Spectrum compatible design ground motion ； Fourier amplitude spectrum ； Nonlinear dynamic analysis ； Ductility ratio ； Available seat width

參考文獻

5. Anil, K. Chopra, Dynamic of Structure, Second Edition, Prentice-Hall, New Jersey, 2001

1. Juin-Fu Chai and Chin-Hsiung Loh (2002) “Modeling of phase spectrum to simulate design ground motion” Journal of Chinese Institute of Engineers, Vol.25, No.4, pp. 447-459

2. California department of transportation, appendix C “Tentative simplified restrainer analysis-California department of transportation method”

3. Tomas Pfeifer, Roberto T. Leon and Tam Lam (2003) “Full-scale tests of seismic restrainer retrofits for simply supported bridges” Journal of Bridge Engineering, ASCE, Vol.8, No.4, pp.191-198

REFERENCE