位移設計法應用於黏滯阻尼器之隔震橋梁

Application of the displacement design method to the base isolated bridge with viscous dampers

柯建宇(Chien-Yu Ko)

指導教授 ： 廖文義

國立臺北科技大學/工程學院/土木與防災研究所/碩士(2012年)

https://doi.org/10.6841/NTUT.2012.00027

摘要

本論文提出一新位移設計法應用於具隔震支承與黏滯阻尼器之混凝土橋梁。於本論文中橋墩和主梁均假設保持彈性，隔震器與黏滯阻尼器則考慮其非彈性行為。設計方法為根據耐震性能水準給定一設計位移，採位移設計法進行設計，設計方法著重於隔震器與橋墩頂端側向位移之控制，利用設計位移反應譜於一理想化為單自由度的規則橋樑上，經由地震之作用，直接獲得相同之歷時位移。主要研究方法為當隔震橋梁為線性等效時提高位移之預測能力，與直接計算橋墩的黏滯阻尼器之阻尼係數來控制，其於地震下位移小於設計位移，並省略傳統力法設計之非線性迭代過程，最後使用歷時分析的結果進行驗證本設計方法。

關鍵字

位移設計法 ； 隔震支承 ； 黏滯阻尼器 ； 非線性歷時分析

並列摘要

This paper introduces a new displacement-based design procedure for concrete bridges on bilinear isolated devices with viscous dampers. The limit state considered in this study is such that the piers and the deck remain elastic, while the isolated devices are allowed to behave inelastically. The design method is given by the designers to a level of performance. The proposed method emphasizes material strain control by means of the lateral displacement of isolator bearings and the lateral displacement of the pier top. The response is obtained directly from the elastic displacement response spectrum and is applicable to regular bridges with rigid superstructures that can be idealized as a single degree of freedom (SDOF) system. The proposed methodology improves the displacement prediction capability of the linear equivalent model when it is applied to bridges supported on isolators, and the fast calculation of the damping coefficient of the viscous dampers to limit the maximum displacement of the structural elements under the target value, avoiding the iterative nonlinear calculations of the current force-based design. The application of the proposed methodology is presented and their results are validated by nonlinear time history analysis.

並列關鍵字

displacement design method ； isolated ； viscous damper ； nonlinear time history analysis

參考文獻

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