高强钢筋高强混凝土Ｌ形短肢剪力墙截面曲率延性分析

Sectional curvature ductility analysis of L-shaped short-leg shear walls with high-strength steel reinforcement and high-strength concrete

摘要

为建立高强钢筋高强混凝土Ｌ形短肢剪力墙(L-shaped short-leg shear walls with high-strength steel reinforcement and concrete，HSHC-L)构件的曲率延性系数的计算公式，弥补现行规范缺乏高强材料组合的Ｌ形剪力墙延性设计依据的不足，本文通过６片HSHC-L构件的低周反复荷载试验，分析轴压比、纵筋配筋率、腹板高厚比、混凝土强度等级变化对屈服曲率、极限曲率和曲率延性系数的影响。研究结果表明，增大纵筋配筋率对提升构件的抗震性能有限，这是由于Ｌ形短肢剪力墙构件破坏时发生在无翼缘端部，而增大纵筋配筋率对于翼缘端部、也就是对受拉区的增幅更大，导致受压区高度增大，极限曲率降低。通过２０１６个工况的计算结果进行多元线性回归分析，推导优化了屈服曲率和极限曲率、曲率延性系数的计算公式，并通过数学模型和经验公式验证其准确性。本文建立的屈服曲率公式相关系数达到０.９７，极限曲率公式相关系数达到０.９７，且曲率延性系数公式的计算结果误差均在１５％内，表明其准确性高，可为HSHC-L构件的变形和基于位移的抗震设计提供依据。

Abstract

This study develops a calculation formula for the curvature ductility factor of L-shaped short-leg shear walls with high-strength steel reinforcement and high-strength concrete (HSHC-L). It addresses a gap in current design codes regarding ductility of L-shaped walls using high-strength materials. Quasi-static cyclic loading tests were conducted on six HSHC-L specimens. The effects of axial compression ratio, longitudinal reinforcement ratio, web height-thickness ratio, and concrete strength grade on yield curvature, ultimate curvature, and curvature ductility factor were analyzed. Results show that increasing longitudinal reinforcement ratio only marginally improves seismic performance. This occurs because failure initiates at the flange-free end. Higher reinforcement ratios primarily strengthen the flange end (tensile zone), increasing compression zone depth and reducing ultimate curvature. Multivariate linear regression analysis of 2016 parametric cases optimized the calculation formulas for yield curvature, ultimate curvature, and curvature ductility factor. Mathematical models and empirical formulas validated the accuracy of these expressions. The proposed yield curvature formula achieved a correlation coefficient of 0.97. The ultimate curvature formula also reached 0.97. All curvature ductility factor predictions had errors within 15%, confirming high accuracy. These formulas provide fundamental references for deformation assessment and displacement-based seismic design of HSHC-L walls.

关键词

高强钢筋高强混凝土 / 屈服曲率 / 极限曲率 / 延性分析 / 回归分析

Key words

high-strength steel and high-strength concrete / yield curvature / ultimate curvature / ductility analysis / regression analysis

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基金资助

国家自然科学基金项目(52168069)

国家自然科学基金项目(51568028)