基于塑性理论的活性粉末混凝土梁抗剪承载力

Shear Capacity of Reactive Powder Concrete Beam Based on Plastic Theory

摘要:

对14根分别考虑了剪跨比、钢纤维含量、配箍率、配筋率以及纵筋强度影响的HRB 500级纵筋活性粉末混凝土（RPC）梁进行受剪试验，得到其抗剪承载力实测值.基于塑性理论对其进行分析，推导出RPC梁的受剪承载力公式与简化公式，采用该式对构件的抗剪承载力进行了预测，将计算结果与实测值和现行规范公式的计算结果进行了对比.结果表明：基于塑性理论所推导的公式能很好地预测RPC梁的抗剪承载力；简化公式的计算结果离散性不大，适合于工程使用；现有规范的计算结果均较保守，但《纤维混凝土结构技术规程》在材料强度修正中的某些思路值得RPC梁借鉴.

Abstract:

Fourteen HRB 500 reinforced RPC beams worked on concentrated load were tested. The influence of shear span ratio, steel fiber content, stirrup ratio, reinforcement ratio, and reinforcement strength was considered. The shear capacity formula and its simplified form based on the plastic theory were concluded. The shear capacity values of the beams were predicted and compared with the test values and the results of current codes. The results show that by using the formulas based on the plastic theory, the shear capacity of RPC beams can be well predicted. The results of the simplified formula are not very discrete which is suitable for engineering. The results of current codes are all conservative. But the ideas of material strength correction in CECS 382004 are worth learning.