高強度鋼筋混凝土柱圍束效應研究

Study on the Confining Effect of Reinforced Concrete Columns Using High Strength Materials

張豐展(Feng-Chan Chang)

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(2010年)

https://doi.org/10.6342/NTU.2010.01151

摘要

一般結構物中底層樓柱構件扮演承受整體結構物垂直載重之重要角色，於地震發生時更需承受極大之基底剪力，超高樓建築物中底樓層之柱構件，因承載上部結構自重，故軸力甚高，若採用現行傳統鋼筋混凝土材料，底樓層柱構件所需之斷面尺寸須大幅加大，但若能有效地提升材料之強度，使用超高強度之鋼筋與混凝土材料，可有效降低柱構件斷面尺寸，增加結構物之建築使用空間，並減少材料的使用且降低自重，同時超高強度鋼筋與混凝土材料的應用，符合環境永續發展之目標。
現有之高強度鋼筋混凝土柱試驗數據，幾乎為縮尺之試體，於實際建築之應用仍有疑慮，現階段急需新的測試研究加以確認。因此本研究擬對超高強度之實尺寸(600×600 mm)五座柱構件進行測試，於國家地震工程研究中心(NCREE)之MATS (Muti Axial Testing System)系統，提供良好之施力平台進行測試。
本研究以降伏強度685 MPa之鋼筋為主筋、785MPa之鋼筋為箍筋，及混凝土設計抗壓強度70、100 MPa與改變箍筋之型式為測試參數，進行高軸壓下之反覆側推試驗。藉以了解超高強度鋼筋混凝土圍束與耐震性能，並檢核規範之強度預測公式是否適用於高強度之鋼筋混凝土材料。利用實尺寸柱構件之測試有助於澄清尺寸效應，並可推動高強度鋼筋混凝土應用於超高層建築工程。

關鍵字

柱 ； 圍束 ； 高強度混凝土 ； 高強度鋼筋 ； 高軸力 ； 雙曲率變形 ； 側向力

並列摘要

In common building structures, columns play important roles as vertical and lateral load carrying members. For some columns of high rise buildings, especially those located at the lower parts, the effect of axial load becomes more dominant, causing a huge size in dimension if designed using normal strength materials. However, due to the development of high strength materials, such as high strength concrete and high strength steel, engineers can now yield a more efficient and economical design of columns.
Based on the current available research on high strength columns, most of the experimental work was related to the testing of reduced-scale specimens due to the limited testing capacity of the laboratory. This thesis focuses on the experimental study of 5 full-scale specimens (600×600 mm) of high strength columns subjected to quasi-static cyclic loading under constant high axial load, which is made executable because of the availability of MATS (Multi Axial Testing System) in National Center Research on Earthquake Engineering (NCREE), Taiwan.
The main purpose of this research is to clarify the size effect, as well as to study the confinement effect and lateral load carrying capacity of reinforced concrete columns with high strength concrete (70, 100 MPa) and reinforced with high yielding strength reinforcement bars, 685 MPa and 785 MPa for column longitudinal and transverse reinforcement bars, respectively. Finally, a verification of the applicability of existing ACI 318-08 code design equation is also evaluated.

並列關鍵字

column ； confinement ； high-strength concrete ； high-strength reinforcement ； high axial load ； double curvature ； lateral force

參考文獻

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[6] ACI Committee 318，Building Code Requirement for Structural Concrete (ACI 318-08) and Commentary (ACI 318R-08)，American Concrete Institute，Farmington Hills，Mich.，2008.

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[8] Saatcioglu, M., and Razvi, S., “High-Strength Concrete Columns with Square Sections under Concentric Compression,” Journal of Structural Engineering, ASCE, V. 124, No. 12, 1998, pp. 1438-1447.

[14] Schlaich, J., Schäfer, K., and Jennewein, M., “Toward a Consistent Design of Reinforced Concrete Structures, PCI Journal, ” Vol. 32, No. 3, pp. 74-150, 1987.