中空鋼筋混凝土桿件之開裂扭矩及開裂扭轉角

Cracking Torque and Twist in Hollow Reinforced Concrete Members

陳昱廷(Yu-Tin Chen)

指導教授 ： 鄭全桓

國立暨南國際大學/科技學院/土木工程學系/碩士(2012年)

https://doi.org/10.6837/NCNU.2012.00109

摘要

論文名稱：中空鋼筋混凝土桿件之開裂扭矩及開裂扭轉角
校院系：國立暨南國際大學科技學院土木工程學系 頁數：94
地震與防災工程研究所
畢業時間：101年6月 學位別：碩士
研究生：陳昱廷 指導教授：鄭全桓

論文摘要

本論文依據實心斷面鋼筋混凝土(RC)梁扭力分析模式Softened Membrane Model for Torsion (SMMT)所推導出之計算開裂扭矩及開裂扭轉角的解析公式(Jeng 2009 , Jeng 2010)，發展出一新的可同時適用於實心及中空斷面RC桿件開裂扭矩及扭轉角之計算公式，並規劃16組中空RC梁扭力實驗試體、且執行其中1組試體試驗。

本論文使用三個既有的經驗公式及SMMT理論導出的解析公式來計算由文獻蒐集篩選的44組中空RC梁試體之開裂扭矩、扭轉角，經由比較實驗數據與計算結果，將既有的解析公式做修正，發展出一可同時適用於實心及中空斷面RC梁之開裂扭矩開裂扭轉角計算公式。本論文亦針對4種混凝土強度、8種壁厚比、並依據極限狀態鋼筋降伏相位圖配置鋼筋量，規劃共16組中空斷面RC梁試體之扭力實驗。本研究並選擇16組試體中的1組B085a試體進行試體細部設計、施工製作，執行試體B085a扭力試驗並呈現其試驗結果。

關鍵詞：鋼筋混凝土、扭力、中空斷面、開裂扭矩、開裂扭轉角、實驗、剪力。

關鍵字

鋼筋混凝土 ； 扭力 ； 中空斷面 ； 開裂扭矩 ； 開裂扭轉角 ； 實驗 ； 剪力

並列摘要

Title of Thesis: Cracking Torque and Twist in Hollow Reinforced Concrete Members
Name of Institute:
Gradute Institute of Earthquake and Disaster Mitigation Engineering,
College of Science and Technology, National Chi Nan University
Page: 94
Graduation Time: 06/2012 Degree Conferred: Master
Student Name: Yu-Tin Chen Advisor Name: Chyuan-Huan Jeng

Abstract
Based on the rational formula derived from the Softened Membrane Model for Torsion (SMMT) for solid reinforced concrete (RC) members (Jeng and Hsu 2009, Jeng 2010), this study develops a unified formula for the cracking torque and twist in hollow and solid RC members. This study also plans an experimental program of 16 hollow RC beam specimens, and performs testing of one of the 16 hollow RC specimens.
In this thesis, four existing formulas are used to calculate the cracking torques and twists of the hollow RC beam specimens currently available in the literature. An existing formula for is modified to fit the test values. Based on the rational formula for solid members (Jeng 2010) and the collected experimental data on hollow specimens, a new formula for and is developed to form a unified formula for solid and hollow sections.
This thesis also plans an experimental program of 16 hollow RC beam specimens. The entire experiment takes into account three major test variables, which incorporate four concrete compressive strengths, eight thickness ratios of hollow section, and four failure phases. Of the 16 planned specimens, a specimen denoted B085a is designed and constructed, and its torsional test is conducted. The test procedure of specimen B085a is also described and the test results are presented in this thesis.

Keywords: Reinforced concrete, torsion, hollow section, cracking torque, cracking twist, test, shear.

並列關鍵字

Reinforced concrete ； torsion ； hollow section ； cracking torque ； cracking twist ； test ； shear

參考文獻

1. ACI Committee 318, Building Code Requirements for Structural Concrete (ACI 318-08) and Commentary, American Concrete Institute, Farming Hills, Mich., 2008, 465 pp.

2. Baumann, T.,1972, Zur Frage der Netzbewehrung von Flachentragwerken, Der .Bauingenieur, vol. 47, No. 6, pp. 367-337.(in German).

3. Bernardo, L. F. A. and Lopes, S. M. R., “Torsion in High-Strength Concrete Hollow Beams: Strength and Ductility Analysis,” ACI Structural Journal, Vol. 106, No.1, Jan.-Feb. 2009, pp.39-48.

4. Belarbi, A. and Hsu, T. T. C.,1994, Constitutive Laws of Concrete in Torsion and Reinforcing Bars Stiffened by Concrete, ACI Structural Journal, Vol. 92, No. 5, Sept.-Oct., pp.562-573.

5. Collins, M. P. and Mitchell D.,1980, Shear and Torsion Design of Prestressed and Non-Prestressed Concrete Beams, PCI Journal, Vol. 25, No. 5, Sep.-Oct., pp.32-100.