【摘要】 为解决泥浆砌体柱轴向承载力低、脆性破坏显著的问题，探究纤维增强水泥基复合材料(ECC)面层加固技术的有效性，设计2组共6个砌体短柱试件(对照组：泥浆灰缝砌筑；加固组：10 mm厚ECC面层加固),开展轴向受压试验，对比分析破坏模式、荷载-位移曲线及应变分布规律。结果表明，(1)ECC面层的套箍效应使砌体核心区处于三向应力状态，承载性能显著提升，与对照组相比，开裂荷载、屈服荷载、峰值荷载分别提高88.1%、158.3%、140.1%;(2)ECC面层通过纤维桥接抑制裂缝扩展，试件延性显著改善，屈服位移与峰值位移增幅分别达79.0%、51.1%;(3)界面应变监测表明，ECC与砌体粘结滑移量小于0.1 mm,协同变形能力良好；(4)提出考虑ECC面层剥离以及纤维桥接影响的承载力修正公式，与试验结果吻合良好。ECC面层加固可有效改善泥浆砌体柱的脆性破坏模式，提升其承载力与延性，为村镇砌体结构加固提供技术参考。更多还原

【Abstract】 To address the issues of low axial bearing capacity and significant brittle failure in mud-mortar masonry columns, and to investigate the effectiveness of engineered cementitious composite(ECC) jacketing strengthening technique, a total of six masonry short column specimens were designed in two groups(control group: constructed with mud mortar joints; strengthened group: strengthened with 10 mm-thick ECC jacketing). Axial compression tests were conducted to comparatively analyze the failure modes, load-displacement curves, and strain distribution patterns. The results indicate that:(1)The confinement effect provided by the ECC jacket induces a triaxial stress state in the masonry core, significantly enhancing the load-bearing performance. Compared to the control group, the cracking load, yield load, and peak load increased by 88.1%, 158.3%, and 140.1%, respectively.(2)The ECC jacket inhibits crack propagation through fiber bridging, leading to a notable improvement in specimen ductility. The increases in yield displacement and peak displacement reached 79.0% and 51.1%, respectively.(3)Interface strain monitoring revealed that the bond-slip between the ECC and masonry was less than 0.1 mm, demonstrating good deformation compatibility.(4)A modified bearing capacity formula, accounting for the influence of ECC jacket debonding and fiber bridging, was proposed and showed good agreement with experimental results. ECC jacketing strengthening can effectively mitigate the crushing failure mode of mud-mortar masonry columns, enhancing both their bearing capacity and ductility, providing a technical reference for strengthening masonry structures in villages and towns.更多还原