軟化壓拉桿模型在RC深短桿件剪力強度設計之應用

Application of Softened Strut-and-Tie Model for Shear Strength Design of Deep RC Members

阮必論(Tat-Luan Nguyen)

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(2016年)

https://doi.org/10.6342/NTU201601623

摘要

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關鍵字

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並列摘要

The ACI 318-14 design procedure for a coupling beam or a grade beam with clear span-depth ratio less than or equal to 4 , which are considered as deep reinforced concrete members, still has some problems need to be investigated. For example, the ACI approach for a deep coupling beam is argued because it determines the amount of diagonal reinforcement to meet shear demands by ignoring the contribution of concrete, which might cause over-supply of diagonal bars and adverse effects to the coupled wall system. The ACI 318-14 is also criticized for lack of specific provision for an intermediate span-depth ratio coupling beam , as it gives engineers freedom to choose either a diagonal or a conventional reinforcement layout, without knowing the consequences. Besides, the ACI strut-and-tie model approach for a grade beam is quite complicated and may not practical for engineering use.
Based on the findings from a six-year experimental and analytical program of previous projects about coupling beams in National Taiwan University from 2010 through 2015, this study continues developing proposed design procedures for coupling beams, which suggest proportioning the amount of flexural reinforcement to meet flexural demand at the Design Based Earthquake (DBE) level. Then, by adopting a capacity concept, the design procedures intend to provide sufficient shear strength at Maximum Considered Earthquake (MCE) level to resist plastic shear demand. In addition, design procedures based on softened strut-and-tie model are developed for grade beams. Five numerical examples of coupling beams and grade beams are also included for illustration

並列關鍵字

coupling beams ； grade beams ； shear strength ； softened strut-and-tie model ； seismic behavior ； seismic design

參考文獻

ACI 318-95 (1995), “Building Code Requirements for Structural Concrete (ACI 318-95) and Commentary (318R-95),” American Concrete Institute, Farmington Hills, Mich., 365 pp.

ACI 318-14 (2014), “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (318R-14),” American Concrete Institute, Farmington Hills, Mich., 520 pp.

ASCE-ACI Committee 445 (1998), “Recent approaches to shear design of structural concrete,” Journal of Structural Engineering, 124(12), 1375-1417.

Hwang, S. J., and Lee, H. J. (1999), “Analytical Model for Predicting Shear Strength of Exterior Reinforced Concrete Beam-Column Joints for Seismic Resistance,” ACI Structural Journal, V. 96, No. 5, pp. 846-858.

Hwang, S. J., and Lee, H. J. (2000), “Analytical Model for Predicting Shear Strengths of Interior Reinforced Concrete Beam-Column Joints for Seismic Resistance,” ACI Structural Journal, V. 97, No. 1, pp. 35-44.