钢筋混凝土空腹夹层板剪力键的静力参数化分析

Parametric analysis of shear keys in reinforced concrete open-web sandwich under static loading

为分析钢筋混凝土空腹夹层板剪力键的静力受剪承载力,本文建立了其压杆-拉杆模型和有限元基准模型。将压杆-拉杆模型计算结果和规范公式以及基准模型计算结果进行了对比。结果表明压杆-拉杆模型与基准模型计算结果较为接近,规范公式计算的受剪承载力与之相差较多。通过参数化分析发现:混凝土的相对受压强度、体积配箍率对剪力键受剪承载力几乎无影响;纵筋配筋率、上肋相对截面高度、剪力键剪跨比对其影响较大。对这些参数进行多元回归分析,得到了基于压杆-拉杆模型的剪力键受剪承载力计算公式。

In order to analyze the static shear capacity of the shear key in open-web sandwich plate,this paper establishes the strut and tie model and finite element reference model.Comparing the calculation results of the strut and tie model with the standard formula and the calculation results of the reference model,it shows that the calculated results of the strut and tie model are close to that of the reference model,and the shear capacity of the shear key calculated by the formula is much different.Through parametric analysis,it is found that the relative compressive strength of concrete and the volumetric stirrup ratio have almost no effects on the shear strength of shear key.The ratio of longitudinal reinforcement,relative height of top rib and shear span ratio are more influential than other parameters,multiple regression analysis of these parameters is carried out,and the formula for calculating shear strength of shear key based on the strut and tie model is obtained.