钢筋混凝土剪力墙塑性铰长度计算模型研究

STUDY ON CALCULATION MODEL OF PLASTIC HINGE LENGTH OF REINFORCED CONCRETE SHEAR WALLS

钢筋混凝土剪力墙塑性铰长度对剪力墙延性和耗能能力有重要影响,而已有的剪力墙塑性铰长度计算模型给出的主要影响因素各有不同。为了准确确定剪力墙塑性铰长度的主要影响因素,选取88片不同配筋参数下剪力墙的分析模型,用有限元分析软件ABAQUS系统地分析不同剪跨比、轴压比和配筋率对塑性铰长度的影响,进而用MATLAB软件回归分析单一因素对塑性铰长度影响,在此基础上,进一步拟合提出了多参数综合影响下的塑性铰长度计算模型。与已有的剪力墙试验数据进行对比,拟合的模型计算所得的极限位移相对误差在15%以下,计算结果与试验结果吻合良好。

The plastic hinge length of reinforced concrete shear walls has great impact on the wall ductility and energy dissipation capacity. However, the contributing factors considered in the present plastic hinge length calculation models are different. In order to determine accurately the main influence factors of the plastic hinge length of reinforced concrete shear wails, 88 pieces of RC shear wails with different reinforcement arrangements were computed by using software ABAQUS, the influence of the shear-span ratio, axial compression ratio and reinforcement ratio on the plastic hinge length of reinforced concrete shear walls were analyzed systematically, and the correlation analysis of the plastic hinge length and these influence parameters were studied by regression analysis using software MATLAB. Then, on this basis, a plastic hinge length calculating model was obtained by multiple regression analysis. Compared with the existing shear wall test data, the relative error of the ultimate displacement calculated by the proposed model was less than 15 percent, which implied that the calculated results were in good agreement with experiment results.