曲线筋PC梁受剪性能试验研究——基于预应力筋角度(θ组)
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摘要
对3根PC梁和1根RC对比梁的受剪性能进行试验研究,剪跨比均为2.2,主要以曲线筋角度θ为研究变量。研究表明:正常配筋率的小剪跨比PC梁易发生弯剪破坏;角度θ越大,对抗剪越不利,梁刚度损伤也相应越大。此外,采用基于截面的抗剪设计方法和拉压杆模型(MSTM)对受剪承载力进行了预测,与试验值对比表明:基于截面的抗剪设计公式不适用,而MSTM预测结果最为精确,且随着角度的变化趋势与试验结果一致。
Three PC beams with draped tendons and one RC beam were tested and the primary variable is the angle of the tendons,θ.All the beams had a shear span to depth ratio,a/h_0,of 2.2.Several results were obtained: beams with both small a/h_0 and normal amount of ρ were inclined to fail in a flexural-shear mode;the greater the θ,the faster of the damage of beams.Besides,sectional design methods and modified strut-and-tie model(MSTM) were used to predict the beam shear strengths,and comparisons with test results indicate that sectional methods are not suitable for such predictions but MSTM not only gives accurate results,but also well account for the effect of the angle of the draped tendons.
Three PC beams with draped tendons and one RC beam were tested and the primary variable is the angle of the tendons,θ.All the beams had a shear span to depth ratio,a/h_0,of 2.2.Several results were obtained: beams with both small a/h_0 and normal amount of ρ were inclined to fail in a flexural-shear mode;the greater the θ,the faster of the damage of beams.Besides,sectional design methods and modified strut-and-tie model(MSTM) were used to predict the beam shear strengths,and comparisons with test results indicate that sectional methods are not suitable for such predictions but MSTM not only gives accurate results,but also well account for the effect of the angle of the draped tendons.
引文
[1]ACI Committee 318.Building Code Requirements for StructuralConcrete(ACI 318-08)and Commentary(318R-08)[S].
[2]BS 8110—1 Structural Use of Concrete-PartⅠ:Code of Practice forDesign and Construction[S].
[3]MacGregror J G,Sozen M A,Siess C P.Effect of DrapedReinforcement on the Behavior of Prestressed Concrete Beams[J].Journal of the American Concrete Institute,Proceedings,1960,57(6):649-677.
[4]GB 50010—2002钢筋混凝土结构设计规范[S].
[5]CSA Committee A23.3.Design of Concrete Structures(CSA A23.3-04)[S].
[6]Wang Guolin and Meng Shaoping.Modified Strut-and-Tie Model forPrestressed Concrete Deep Beams[J].Engineering Structures,2008,30(12):3489-3496.
[7]陶学康.无粘结预应力混凝土设计与施工[M].北京:地震出版社,1992.
[2]BS 8110—1 Structural Use of Concrete-PartⅠ:Code of Practice forDesign and Construction[S].
[3]MacGregror J G,Sozen M A,Siess C P.Effect of DrapedReinforcement on the Behavior of Prestressed Concrete Beams[J].Journal of the American Concrete Institute,Proceedings,1960,57(6):649-677.
[4]GB 50010—2002钢筋混凝土结构设计规范[S].
[5]CSA Committee A23.3.Design of Concrete Structures(CSA A23.3-04)[S].
[6]Wang Guolin and Meng Shaoping.Modified Strut-and-Tie Model forPrestressed Concrete Deep Beams[J].Engineering Structures,2008,30(12):3489-3496.
[7]陶学康.无粘结预应力混凝土设计与施工[M].北京:地震出版社,1992.
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