碳纤维板嵌缝加固砖墙抗震性能试验研究

粘贴碳纤维片材加固砌体结构可以有效提高其抗震性能，但并不适用于建筑立面有要求的古建砌体结构。为此，采用碳纤维板嵌缝加固砌体墙，即在墙体表面剔除既有水平灰缝内的部分砂浆，通过结构胶将碳纤维板嵌入砌体墙内，使墙体、结构胶、碳纤维板黏结成为整体。该方法既不改变墙体的外观现状，又可以有效提高砌体墙的抗震性能。为研究这种方法对砌体结构的加固效果，通过3片墙体的低周往复荷载试验，对比研究了单面和双面碳纤维板材嵌缝加固砌体砖墙的抗震性能。试验结果表明：碳纤维板材嵌缝加固可以改变墙体的破坏模式，使墙体的破坏模式由脆性的剪切破坏转为延性较好的弯剪破坏或者弯曲破坏，显著提高墙体的承载能力、变形能力、延性和耗能能力；与未加固墙体相比，单面加固和双面加固墙体的位移延性系数分别提高了3.94%和25.81%，双面加固墙体的延性提高幅度更大；与单面加固墙体相比，双面加固墙体的滞回曲线更加饱满，耗能能力更强。

Experimental study on seismic performance of brick wall strengthened with seam embedded CFRP plates

The seismic performance of masonry structures strengthened with external bonding carbon fiber reinforced polymer (CFRP) sheets can be significantly improved, but it is not suitable for ancient masonry structures with facade requirements. Therefore, it is proposed that the masonry wall can be strengthened with seam embedded CFRP plates. That is, to remove part of mortar in the existing horizontal mortar joint on the wall surface, and to embed carbon fiber plates into masonry joints through structural adhesive, so that the wall, structural adhesive and CFRP plates can be bonded as a whole. This method not only does not change the appearance of the wall, but also effectively improve the seismic performance of the masonry. In order to study the effect of this strengthening method for masonry structures, the low cycle loading test of three brick masonry specimens was conducted to compare the seismic performance of masonry structures with single-sided and double-sided embedded CFRP plates. The test results show that the failure mode of the wall strengthened with seam embedded CFRP plates can be changed from brittle shear failure into bending-shear failure or bending failure with better ductile performance, which can significantly improve the load bearing capacity, deformability, ductility and energy dissipation capacity of the wall. Compared with the unstrengthened wall, ductility coefficients of single-sided and double-sided strengthened walls have increased by 3.94% and 25.81%, respectively, and the ductility performance of double-sided strengthened wall has been improved more significantly. Compared with the single-sided strengthened wall, the hysteretic curve of the double-sided strengthened wall is fuller and the energy dissipation capacity is more favorable.