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標題: 實尺寸輕質粒料混凝土梁構件之力學行為
Research on the Mechanical Behaviors of Full Scale Lightweight Aggregate Concrete Beam
作者: 吳崇豪
Wu, Chung-Hao
關鍵字: lightweight aggregate concrete;輕質粒料混凝土;beam;flexural;shear;size effect;梁;撓曲行為;剪力行為;尺寸效應
出版社: 土木工程學系所
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Carpinteri, Chapter 4, Elsevier Science Publishers Ltd., England, 1992. 69. C. Bosco, A. Carpinteri and P. G. Debernardi, “Minimum Reinforcement in High-Strength Concrete,” Journal of Structural Engineering, Vol. 116, Issue 2, pp. 427-437, 1990. 70. 內政部營建署編輯委員會,「結構混凝土設計規範」,第2版,台北:營建雜誌社,第3.1.6節,2003年。
The research works in Taiwan up to date mostly focus on the laboratory specimen size. It seems valid and necessary to engage on more studies of full size specimen tests, which will lead directly to the design work in practice. It is felt that more information about the flexural and shearing behaviors of reinforced lightweight aggregate concrete (LWAC) beams should be understood. For this reason, the study presents an experimental investigation on flexural behavior, shear behavior and size effect of full scale reinforced lightweight aggregate concrete beams made with lightweight aggregate that manufactured from fine reservoir sediments.
The design strength of concrete is fc’ = 34 MPa. For flexural test, third-point loading test was performed and the beam dimension is 250 mm × 400 mm with three reinforcement ratios of 0.32 %、0.97 % and 1.29 %. For shearing test, center-point loading test was adopted for beams with same cross section as the flexural test specimen, but various span-to-depth ratios (a/d = 1.5, 2.5 and 3.5). For size effect test, three-point loading test was performed for identical beams with three different scales in dimension. The beams are all designed with minimum reinforcement according to ACI and the a/d = 3.0.
The results of flexural test showed that LWAC beams have similar load capacities and failure types as those of normal weight concrete (NC) beams. However, LWAC beams seem to present larger curvature and ductility. The current elastic flexural theory adopted by ACI 318 Code for predicting the deflection of LWAC beam is on the average 10 % smaller than the measured deflection.
The shear test results showed that the shear failure modes of LWAC beams are similar to those of NC beams, including shear-compression failure and shear-tension failure. The shear failure surface of LWAC beams are smoother than those of NC beams, resulting in a brittle failure. Moreover, the shear strength of LWAC beams, similar to those NC beams, increase with the increase of a/d ratios; in which, the ultimate shear strengths of LWAC beams are smaller than those of NC beams. The ACI code provision with respect to the ultimate shear strength of LWAC beam appears to be conservative, particularly for beams with a/d ratio in the range of 1.5 to 2.5. In addition, Vu,t/Vu,Z ratios computed based on the Zsutty’s equation seems to be more reasonable than those computed using the ACI equation or the Rebeiz’s equation. Hence, the Zsutty’s equation is appropriate for the shear strength prediction of LWAC beams.
From the size effect analysis, it was found that the deflection ductility (μΔ) in terms of the ratio of ultimate deflection (Δu) to yielding deflection (Δy) decreases with the increase of the size of the specimen. In which, the reduction rate of μΔ with respect to the effective depth of LWAC beams is obviously larger than that of NC beams. In addition, the ultimate deflection-to-depth (Δu/s) of both concrete beams increases with the decrease of beam sizes; whereas, the declination of the Δu/s ratio of LWAC beam is more significant than that of the NC beams. This indicates that the LWAC beam behaves stronger size effective.

本文以水庫淤泥燒製之輕質粒料,製作實尺寸鋼筋輕質粒料混凝土梁與常重混凝土梁,探討其撓曲行為、剪力行為及尺寸效應。試驗使用之輕質粒料混凝土與常重混凝土,其設計強度 (fc’) 均取為34 MPa。撓曲試驗之梁斷面尺寸為250 mm × 400 mm,考慮三種不同鋼筋比 (ρ = 0.32 %、0.97 %及1.29 %);梁之加載採用三分點載重試驗法。剪力試驗部分,梁試體之斷面尺寸與撓曲試驗者相同,選用三種不同剪跨與有效深度比,a/d = 1.5、2.5及3.5;載重試驗則以中央點載重方式進行。另外,在尺寸效應部分,製作三種不同尺寸,但幾何形狀相似的鋼筋混凝土梁構件,則以三點載重方式進行試驗,其剪跨與有效深度比取a/d = 3.0。
撓曲試驗結果顯示,混凝土強度相同的輕質混凝土梁,其降伏載重和極限載重與常重混凝土梁者相近,但前者的極限撓度和曲率延展性都大於後者。以ACI規範建議的彈性撓曲理論,推求輕質混凝土梁的撓度時,得知梁的降伏撓度計算值與實驗值接近,表示ACI法適合應用於輕質混凝土梁的撓曲行為預測。輕質混凝土梁的剪力破壞模式,與常重混凝土梁者相似,包括剪壓破壞及剪拉破壞兩種。輕質混凝土梁的剪力破壞面光滑,屬於脆性破壞,其剪力強度與常重混凝土梁一樣,也隨a/d的減小而增大,但都小於常重混凝土梁者。對於輕質混凝土梁的極限剪力強度預測,ACI規範建議式的預測值較為保守;Zsutty式的預測值則只略大於實驗值,可評估為最適宜的預測式。另外,從尺寸效應試驗結果發現,輕質混凝土梁的撓度延展性 (μΔ = Δu/Δy),隨尺寸的增大而減小,即較大之梁其韌性較差。而輕質混凝土梁的μΔ隨尺寸 (d) 之減低率,明顯大於常重混凝土梁者,表示輕質混凝土梁的尺寸效應較為明顯。輕質和常重混凝土梁的撓度跨距比 (Δu/S) 都隨梁尺寸的增大而減小,但輕質混凝土梁Δu/S的衰減會比常重混凝土梁者顯著。
其他識別: U0005-2508201010173800
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