竖波钢板组合剪力墙截面性能及曲率分析

SECTION PERFORMANCE AND CURVATURE ANALYSIS OF VERTICAL CORRUGATED STEEL PLATE COMPOSITE SHEAR WALLS

现行基于承载力的抗震设计方法缺乏对构件截面性能的准确反映,对于剪力墙等重要抗侧力构件在地震作用下的性能要求缺乏体现。竖波钢板组合剪力墙因内嵌波形钢板的几何形状优势,表现出良好的抗震性能,对其截面性能的分析有待研究。该文基于竖波钢板组合剪力墙的组合机理和破坏现象,提出截面曲率的理论计算方法,给出荷载-位移曲线转化为弯矩曲率曲线的计算过程,通过试验数据验证了理论计算方法的准确性以及数值计算模型的适用性。扩展研究波形钢板几何参数、约束边缘H型钢、分布钢筋规格等构造设置以及混凝土强度、钢材强度等材料性能变化在不同轴压力下对截面曲率和曲率延性的影响规律,相关性分析发现约束边缘H型钢是唯一与特征点曲率及曲率延性保持正相关的参数。该文分别提出竖波钢板组合剪力墙截面屈服、峰值、极限点曲率的简化计算方法并进行验证,证明了公式的准确性与适用性,可为竖波钢板组合剪力墙的弹塑性变形能力计算以及其损伤控制分析提供一定的理论支撑。

The current seismic design method based on load bearing capacity lacks an accurate reflection of the cross-sectional performance of members,and the performance requirements of important lateral force resisting members such as shear walls under seismic action are not reflected.The vertical corrugated steel plate composite shear walls exhibit good seismic performance due to the excellent geometric advantages of the embedded corrugated steel plate,and the analysis of their cross-sectional performance is yet to be investigated.Based on the combined mechanism and damage phenomena of the vertical corrugated steel plate composite shear walls,the theoretical calculation method of section curvature and the calculation procedure of converting the load displacement curve into bending moment curvature curve are presented in this study.The accuracy of the theoretical calculation method and the applicability of the numerical calculation model are verified by experimental data.Expanded research is also performed on the influence of corrugated steel plates,of boundary elements,of distributed steel bars,and of material properties such as concrete strength and steel strength on section curvature and curvature ductility under different axial pressures.The correlation analysis found that the boundary element is the only parameter that maintains a positive correlation with the curvature of the characteristic point and the curvature ductility.The proposed simplified calculation formulas for the section yield,peak,ultimate curvature of the vertical corrugated steel plate composite shear walls have been proved accurate and applicability,which can provide some kind of theoretical support to calculate the elastoplastic deformation capacity and its damage control.