高延性混凝土加固砖柱轴压性能试验研究

高延性混凝土（HDC）是一种具有高强度、高韧性和高耐损伤能力的新型结构材料。该文提出采用HDC面层加固砖柱，对27个砖柱试件进行了轴压性能试验研究。结果表明:1）HDC作为砌筑砂浆，可对砌体形成一定的约束作用，使砖柱的轴压承载力和变形能力均有所提高；2）HDC面层发挥了较强的套箍作用，使砖柱处于三向受压状态，承载力和变形能力均得到较大幅度提高，且改善了砖柱的脆性破坏特征；3）HDC面层与砖柱具有良好的协调工作能力，对提高砖柱的整体性能具有重要作用。考虑HDC面层对砖柱的约束作用，提出了HDC面层加固砖柱的轴压承载力计算方法，计算结果与试验结果吻合较好。该文研究结果为砌体结构加固提供了一种新方法，具有良好的推广应用前景。

EXPERIMENTAL INVESTIGATION ON AXIAL COMPRESSION OF BRICK COLUMNS STRENGTHENED WITH HDC

Highly ductile fiber reinforced concrete (HDC) is a building material of high strength, ductility and damage tolerance. A new strengthening technique for brick columns with HDC layers was proposed in this study. 27 brick columns were tested in axial compressive loading. The experimental results showed that: 1) HDC can provide confinement effects on masonry when used as mortar, thus the axial bearing capacity and deformability of brick columns were improved;2) Under the confinement of HDC layers, the brick columns work in triaxial compression. The axial bearing capacity and the deformability were both significantly enhanced, and the brittle failure was delayed;3) HDC layers and the core brick columns had good synergy work, which played an important role in enhancing the overall performance of brick columns. A calculation model was proposed to predict the ultimate strength of brick columns confined with HDC layers, and the calculation results agreed well with experimental results. Based on the tested results, the HDC can be used as an alternative material for masonry strengthening with broad engineering application.