• 作者： 田堯彰;楊秋興
• 作者服務機構： 國立臺灣大學土木系
• 中文摘要： 本文目的在建立一個簡單的分析模型以計算管線系統的受震反應。管線受震的破壞多由於節點的拉脫或壓毀以及管線本身的斷裂，因之文中將研究在不同的土壤狀況與材料性質下，管線所受的最大相對節點位移與最大結構應變。其數值結果將為結構設計與可靠度分析的有用參考。 一長直管線乃由數個管段以機械接頭連接而成。每管段以一彈簧及阻尼器與土層銜接，管段為彈性而接頭則視為另一個彈簧與阻尼器的組合。輸入為一沿管軸方向的正弦波。輸入與反應皆限於軸方向。文中將導出運動方程式，而以一相當簡易的方式算出結構反應。擬靜力反應與動力反應的結果將予以比較以了解慣性與阻尼的效應。振動頻率、節點勁度、段徑大小，與管段長度對於結構反應的影響將予以詳細探討。最後亦考慮土壤不均性所造成的震波反射與折射對結構反應的影響。
• 英文摘要： The objective of this study is to develop a simple analytical model to assess dynamic responses of apipeline system under ground shaking. Since many observed failures of buried pipes are attributable to pull-out or crushing at joints and break along the pipeline itself, the present model is proposed to estimate themaximum relative joint displacement and the maximum structural strain under various soil conditions andmaterial properties. The numerical result may serve as a useful guide for structural design as well as reli-ability analysis. A long, straight, segmented pipeline which consists of a series of pipes connected with mechanicaljoints is assumed to be attached to the ground through a ground spring and dashpot in each pipe. The pipeis elastic and the joint is deemed as another spring dashpot combination. It is assumed that the input iscaused by sinusoidal waves which advance along the axis of the pipeline at a constant velocity. The inputand the response are restricted to the axial direction. The governing equations of motion are then derived.The structural responses are calculated by a rather simple manner. The outcomes from both the quasi-static approach and the dynamic analysis are compared to examine the inertia and damping effects whichare generally neglected in dealing with such a structure. The effect of excitation frequency, joint stiffness,pipe size, and pipe length on structural responses is studied thoroughly. A rather ideal model consideringsoil inhomogeneity which causes wave reflection and variation in velocity is also examined.
• 中文關鍵字： Iifeline earthquake engineering; structural dynamics; pipeline
• 英文關鍵字： --