湿热环境下古砌体剪切粘结滑移特性及损伤本构模型
Shear bond-slip behavior and damage constitutive modeling of historic masonry under hygrothermal conditions
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摘要: 为揭示湿热环境下古砌体界面剪切性能的损伤机理,本文基于陕西地域气候特征,设计多周期湿热循环加速老化试验,开展古砌体双剪试验。基于试验结果,对比分析试件在不同湿热循环及预压应力两因素下剪切破坏形态、界面剪切力学特性的演化规律;在此基础上,引入统计损伤理论,构建湿热耦合作用下古砌体剪切损伤本构模型。结果表明:预压应力通过增强界面摩擦与机械咬合作用显著提高界面抗剪性能,是影响界面剪切强度的主导因素,其贡献率达87%;湿热循环贡献率为8%,但其对界面性能呈阶段性影响,初期灰浆碳化使峰值强度提升约17%,随循环持续进行,界面峰值强度逐渐下降、峰值滑移增大,表现出明显的损伤累积特征。基于统计损伤理论构建的界面剪切损伤本构模型与试验结果吻合良好,能够较准确表征古砌体界面的全过程剪切应力-滑移响应。研究成果可为湿热环境下古砌体界面剪切损伤演变提供力学解释。Abstract: To elucidate the damage mechanisms of the interfacial shear performance of historic masonry under hygrothermal conditions, a multi-cycle hygrothermal accelerated aging test was designed based on the climatic characteristics of Shaanxi Province, and double-shear tests were conducted on historic masonry specimens. Based on the experimental results, the evolution of shear failure modes and interfacial shear mechanical properties under different hygrothermal cycles and pre-compression stress levels was comparatively analyzed. Furthermore, a constitutive model for interfacial shear damage of historic masonry under coupled hygrothermal effects was established based on statistical damage theory. The results indicate that pre-compression stress significantly enhances the interfacial shear performance by improving interfacial friction and mechanical interlocking and serves as the dominant factor affecting interfacial shear strength, with a contribution ratio of 87%. In contrast, the contribution ratio of hygrothermal cycling is 8%, although it exhibits a stage-dependent influence on interfacial performance. During the initial stage, mortar carbonation increases the peak shear strength by approximately 17%. With continued cycling, the peak shear strength gradually decreases and the peak slip increases, indicating evident cumulative damage. The interfacial shear damage constitutive model established based on statistical damage theory agrees well with the experimental results and can accurately characterize the full-stage shear stress-slip response of historic masonry interfaces. The findings provide a mechanical explanation for the evolution of interfacial shear damage in historic masonry under hygrothermal conditions.
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