高強度鋼筋混凝土柱耐震圍束設計之研究

Design of Seismic Confinement of RC Columns Using High Strength Materials

紀偉凡(Wei-Fun Che)

指導教授 ： 黃世建

國立臺灣大學/工學院/土木工程學研究所/碩士(2012年)

https://doi.org/10.6342/NTU.2012.11021

摘要

為了應對台灣都市更新，高樓層建築發展會逐漸成為興建趨勢。然而，愈高樓層結構物，於中底層樓柱構件亦會隨著承載更大之上部結構自重，軸力甚高。根據日本經驗積極發展超高材料強度之New RC建築，除了有效改善以上問題，還能有利縮減構件的斷面尺寸，增進建築物室內使用空間。因此，推廣超高材料強度建築構件應用於工程實務上實屬勢在必行。但位於地震帶國家之結構物安全，除了針對強度要求做設計亦須符合耐震能力需求，承受相當的層間變位，所以柱構件在達到超高材料強度的同時也必須具有良好的側位移能力。
超高強度混凝土會呈現更明顯的脆性行為而往往侷限了耐震的性能。對承受高軸力之高強度混凝土柱，若需要求其側向位移能力時，則應提供更高之箍筋圍束量方能達成。事實上，國內既有的工程設計規範同ACI 318-05規範，其建議之柱圍束箍筋量公式應用於高強度混凝土柱時明顯不足，亦欠缺了位移能力的概念，故有對其研究並進一步改善設計公式的必要。
本研究參考各國規範所提出之柱圍束箍筋量設計公式進行比較，同時利用海外太平洋地震工程研究中心( PEER )結構性能資料庫和國家地震工程研究中心( NCREE )過去的測試數據作檢核，藉此探討各公式對測試結果的敏感度，分別為橫箍柱及螺箍

關鍵字

柱 ； 高強度 ； 高軸力 ； 圍束 ； 位移能力 ； 設計公式

並列摘要

High-rise building should be a trend in order to deal with Taiwan’s urban renewal. Hence, lower-story columns sustain self-weight above which means higher axial load for high-rise building. According to New RC building experienced of Japan, using of high strength materials can effectively solve this problem and reduce the dimension of members for additional interior usage. Therefore, high-strength materials were strongly recommended in construction industry. However, only strength criteria for design is inadequate for a concrete building subjected to earthquakes. Lateral deformation capacity of columns is also an important issue.
In fact, high-strength concrete can lead to brittle failure. Thus, adding the transverse reinforcement to confine the column core is necessary for high-strength columns subjected to high axial load. According to database of the past, confinement provisions in ACI 318 code do not necessarily ensure adequate deformation capacity and, therefore, to revise the design equation for seismic confinement is the main objective in this research.
This study firstly reviewed the current code design equations of different countries. Then, those different design equations were compared using database of column specimens subjected to reversed-cyclic loading test from PEER center and NCREE.
Furthermore, the new confinement design equations for both tied columns and spiral columns were proposed to ensure drift limits and deformation capacity of columns. Finally, 8 column specimens were designed based on proposed equation. This test program for validation of proposed equations will be carried out at NCREE in the near future.

並列關鍵字

column ； high strength ； high axial load ； confinement ； deformation capacity ； design equation

參考文獻

[32] 張豐展，「高強度鋼筋混凝土柱圍束效應研究」，碩士論文，國立台灣大學土木工程學系，台北，民國99年。

[33] 陳盈璋，「高強度鋼筋混凝土柱耐震圍束效應之研究」，碩士論文，國立台灣大學土木工程學系，台北，民國100年 。

[6] ACI Committee 318, “Building Code Requirement for Structural Concrete (ACI 318-11) and Commentary” American Concrete Institute, Farmington Hills, Mich., 2011.

[7] Paultre, P.; and Légeron, F., “Confinement Reinforcement Design for Reinforced Concrete Columns,” Journal of Structural Engineering, ASCE, V. 134, No. 5, 2008, pp. 738-749.

[16] Sheikh, S. A.; and Bayrak, O., “High-Strength Concrete Columns under Simulated Earthquake Loading,” ACI Structural Journal, V. 94, Nov.-Dec. 1997, pp. 708-722.