钢筋混凝土界面抗剪承载力计算方法比较研究

Comparison Research on Computational Method about Interface Shear Capacity in Reinforced Concrete

由于对钢筋混凝土界面剪切破坏机理缺乏足够的认识,国内外各规范、计算手册及规程中界面抗剪承载力的计算模式不尽相同。介绍了6个具有代表性的计算模式,并利用所收集的试验数据进行了比较。结果显示采用摩擦抗剪计算模式的计算值较试验值偏于保守,而采用修正的摩擦抗剪模式的计算值与试验值相对吻合较好。ACI318-05及PCI设计手册(第六版)中对界面抗剪承载力上限值的规定,在一定程度上限制了高强度混凝土材料性能的充分发挥。在比较分析的基础上对钢筋混凝土界面抗剪承载力的计算方法提出了建议。

Due to insufficient knowledge of interface shear failure mechanism in reinforced concrete, calculating modes of interface shear capacity adopted by domestic and foreign codes, regulations and design handbooks differ considerably. Six representative calculating modes were introduced and compared based on the available test data. Results show that calculated value of shear friction mode is more conservative than test value ,whereas calculated value of modified shear friction mode agrees well with test value. The upper limit value of interface shear capacity set out in ACI318 05 code or PCI design handbook （6th edition） has prevented full advantage of material performance when very-high-strength concretes are used. Based on the comparison and analysis, suggestions for computational method of interface shear capacity in reinforced concrete were proposed.