竖波钢板组合剪力墙等效塑性铰长度研究

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。在基于性能的抗震设计要求下，竖波钢板组合剪力墙等效塑性铰长度的确定对合理评估其塑性变形能力至关重要，但国内外已有公式均难以体现其复杂的组合作用，有待提出针对性的简化计算式。基于课题组前期试验成果，通过对竖波钢板组合剪力墙试验破坏现象和受力机理的分析，采用OpenSEES软件，建立有限元模型。扩展研究波形钢板几何参数、约束边缘H型钢柱、分布钢筋配置、混凝土强度、设计轴压比以及剪力墙高宽比等参数对等效塑性铰长度的影响规律，发现使用波形钢板含钢率可以更有效地反映波形钢板几何参数对等效塑性铰长度的影响，而混凝土强度和分布钢筋配箍率与等效塑性铰长度呈负相关。通过理论分析和推导提出多参数控制的竖波钢板组合剪力墙等效塑性铰长度简化计算式，该式适合于估算竖波钢板组合剪力墙的塑性变形能力，可以用于该类剪力墙的弹塑性分析。

Equivalent plastic hinge length of vertical corrugated steel plate composite shear walls

The vertical corrugated steel plate composite shear walls exhibit good seismic performance due to the geometric advantages of the embedded corrugated steel plate. Under the requirements of performance-based seismic design, the determination of the equivalent plastic hinge length of the vertical corrugated steel plate composite shear walls is essential to reasonably evaluate its plastic deformation capability, but the existing formulas at home and abroad are difficult to reflect their complex combination. There is thus a need to develop a specific simplified formula.Based on the previous experimental results of the authors’ research group, through the analysis of the experimental failure phenomenon and mechanical performance of the vertical corrugated steel plate composite shear walls, the corresponding finite element (FE) model was established by the OpenSEES software. The FE model was used to examine the effects of geometric parameters of corrugated steel plates, boundary elements, distributed steel bars, concrete strength, axial compression ratio, and height-width ratio. It is found that the volume ratio of the corrugated steel plate can more effectively reflect the effects of geometric parameters of corrugated steel plate, while the concrete strength and the distributed steel bars are inversely correlated with the equivalent plastic hinge length. Through theoretical analysis and derivation, a multi-parameter-controlled simplified calculation formula for the equivalent plastic hinge length of vertical corrugated steel plate composite shear walls is presented, which is suitable for the estimation of plastic deformation capacity and can be used for the elastoplastic analysis of this type of composite shear walls.