摘要(英) |
The purpose of the experimental study is to investigate the relationship between effective width and the shear span under cyclic loading. When referring to slab participation in practical design, engineers usually ignored the effective width in negative moment.
According to the research [8] in 2012, the effective widths are different between short beams and slender beams. Furthermore, the slab participation is a drift-controlled problem, the effective width would increase with the drift ratio. To estimate the contribution of slab reinforcements in negative moment is the most important thing.
The test results indicate the initial stiffness of slender beams (a/d>2.5) in negative moment were higher than positive moment about 10%, and it was found that the slab participation in initial stiffness of slender beams were more obvious than the short beams (a/d<2.5). Probably, the shear span is one of the factors in slab participation in initial stiffness.
The effective width of short beams (a/d<2.5) with construction joint were wider than the beam without construction joint, and the effective width of slender beams were all full of the width. According to the effective width design of ACI 318-11 (4bw), it may not be conservative in negative moment. |
參考文獻 |
參考文獻
[1] ACI Committee 318, Building Code Requirement for Structural
Concrete, ACI318-11 & Commentary, American Concrete Institute, 2011.
[2] ACI-ASCE Committee 352, “Recommendations for Design of Beam-Column Joints in Monolithic Reinforced Concrete Structures ,” American Concrete Institute, 2002, pp.3-5.
[3] Standards Association of New Zealand, NZS 3101: New Zealand Concrete Structures Standard, Part 1- the Design of Concrete Structures, Part 2- Commentary on the Design of Concrete Structures, New Zealand, 2006.
[4] Aoyama, H., Design of Modern Highrise Reinforced Concrete Structures, Imperial College Press, 2001, pp.136-141.
[5] Paulay, T, and Priestley, M.J.N., Seismic Design of Reinforced Concrete and Masonry Building, John Wiley & Sons, New York, 1992.
[6] S. J. Pantazopoulou and C. W. French, “Slab Participation in Practical
Earthquake Design of Reinforced Concrete Frames,” ACI Structural Journal, July-Aug., 2002.
[7] 中國土木水利工程學會,混凝土工程設計規範與解說,土木401-100,2011。
[8] 鄭智仁, 「預鑄施工梁與版間冷縫對T形斷面梁耐震行為之影響」,國立中央大學,碩士論文,民國一百零一年。
[9] 徐嘉仁,「New RC之T形斷面梁澆鑄界面對耐震行為影響」,國
立中央大學,碩士論文,民國一百零二年。
[10] 許禎祐,「有鋼筋截斷之RC梁耐震行為探討」,國立中央大學,
碩士論文,民國一百零一年。
[11] 余成偉,「高強度鋼筋混凝土梁塑性鉸長度之探討」,國立中
央大學,碩士論文,民國一百零二年。
[12] 陸景文、詹穎雯、陳振川,「台灣地區混凝土抗壓強度與彈性模數特性研究」,中國土木水利工程學會學刊,第十四卷,第三期,第371-379頁,民國九十三年。
[13] EIwood, K.J. and Moehle, J.P., “Drift Capacity of Reinforced Concrete Columns with Light Transverse Reinforcement , ” Earthquake Spectra, Vol. 21, No. 1,pp. 71-89, 2005. |