臺灣博碩士論文加值系統

本論文提供一種新的步驟計算圓形中空預力混凝土桿之極限彎矩強度方法。本論文先介紹PCI設計規範之研究報告中所提出預力桿之極限彎矩強度的計算方法，並提出桿設計案例的計算結果；接著介紹本論文所提出極限彎矩強度之計算方法，提出相同桿設計案例的計算結果並且討論兩種計算方法之差異性。傳統圓形中空預力混凝土桿的混凝土壓力區面積計算，係使用一般數值疊代的方法，利用力之平衡及變位諧和條件的相互逼近，其環形面積定義為中性軸以上壓力區混凝土面積乘上一個面積折減因子。此種使用數值疊代方法計算折減環形面積的質量中心是可行的，可是由於混凝土壓力區及縱向鋼鍵應變的多樣性，造成計算上有一些不便性。本論文因此從不同的角度去尋求解決之道，在決定環形面積中性軸位置的過程中，並不需要使用面積折減因子，而是直接以面積分的觀念處理。這個結果和PCI設計規範之方法比較，可得到的令人滿意的結果，對預力混凝土圓桿的設計而言，本論文之主要目的即在於提供一個接近解析解的公式，能在相關軟體程式上可以容易地計算及應用。

An alternative technique for the determination of ultimate moment capacities of round prestressed concrete poles is presented in this paper. The traditional concrete compression area of poles is determined using the conventional iterative design process. The compatibility and equilibrium approach. Moreover, the area of annulus defined by the neutral axis is multiplied by an area-reduced factor. It is possible to use numerical methods to calculate the centroid of the reduced annulus. However, the concrete compression zone and strain variation in the longitudinal reinforcement makes the calculation awkward. This paper addresses the problem form a different perspective. No reference to area reduction factor is required in the course of locating the neutral axis. The results are compared in a very satisfactory manner with that obtained using PCI approach. The purpose is to provide formulations that can be easily computerized and implemented on relevant software for the design of round prestressed concrete poles.

摘 要 Ⅰ
ABSTRACT Ⅱ
誌 謝 Ⅲ
目 錄 Ⅳ
圖表目錄 Ⅵ
第一章 前言 1
§1-1 引言 1
§1-2 文獻回顧 2
§1-3 本文內容 4
第二章 預力混凝土桿的用途與型式 5
§2-1 使用目地 5
§2-1 結構型式 5
第三章 材料性質 9
§3-1 混凝土 9
3-1-1混凝土特性 9
3-1-2 混凝土應力-應變曲線 9
3-1-3容許應力 10
§3-2 鋼鍵 10
3-2-1 鋼鍵特性 10
3-2-2 鋼鍵荷重-伸長量曲線 10
3-2-3 容許應力 11
第四章 PCI分析極限彎矩強度之原理與方法 14
§4-1原理與假設 14
§4-2計算極限彎矩強度 18
第五章 新的極限彎矩強度之原理與方法 25
§5-1計算極限彎矩強度 25
第六章 實例計算 31
§6-1 例題一 31
§6-2 例題二 36
第七章 結論 42
參考文獻 43
符號索引 47
附錄一 50

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