高延性混凝土加固无筋砖砌体墙抗震性能试验研究

为提高砖砌体墙的抗震性能，采用高延性混凝土（HDC）对其进行加固，对4片HDC加固砖墙和2片作为对比试件的未加固砖墙进行低周水平往复加载试验，主要研究不同加固形式（构造带加固和面层加固）及墙体砂浆强度对加固砖砌体墙的滞回性能、破坏形态、水平承载力及刚度退化等抗震性能的影响。试验结果表明：采用HDC加固可显著提高墙体的承载力和位移延性，延缓墙体开裂和刚度退化，改善墙体的脆性破坏特征；HDC构造带可对砖墙形成有效约束作用，改变墙体的破坏模式。基于试件的破坏形态，提出加固墙体的承载力计算方法，并根据试验结果进行了验证。

Experimental studies on seismic behavior of unreinforced masonry walls strengthened with HDC layer

High ductile concrete (HDC) was used to improve the seismic behavior of unreinforced brick masonry walls. 4 HDC-retrofitted walls and 2 unretrofitted masonry walls served as reference specimens were tested subject to low-cycle repeated loading. The influences of different strengthening schemes (strips and coatings) and mortar strengths on the failure patterns, the hysteretic characteristics, the lateral strength, the stiffness degradation, etc. were investigated. Test results show that retrofitting masonry walls with HDC can effectively improve the lateral strength and the displacement ductility, delay the occurrence of cracks and the degradation of the stiffness, and reduce the brittle characteristic of failure modes; HDC strips can change the failure mode and provide an effective restraint for the masonry wall. Based on the failure pattern of specimens, calculation methods were proposed to estimate the ultimate lateral strengths of retrofitted masonry walls, and then, the methods were validated based on the test results.