复合片材泥浆加固土坯砌体抗剪性能试验研究

Experimental study on the shear performance of adobe masonry strengthened with composite mesh mud

采用2种材料组成的8种加固方案对土坯砌体进行加固,加固材料分别采用3种不同规格的玻璃纤维增强复合材料(GFRP)格栅和2种径宽的钢丝网。通过对角抗剪试验发现:采用对拉螺栓的加固施工的可操作性良好;分析试验数据得出:加固组的抗剪强度均得到较大提高,与未加固组相比,试件的平均抗剪强度提高了337.5%,平均剪应变提高了530.8%;不仅试件的延性得到改善,而且整体性也得到了显著的提升。复合片材泥浆加固改变了试件的破坏模式,但加固材料的力学性能没有得到充分的发挥。通过综合考虑,推荐采用1号GFRP网片双层加固方法。

The adobe masonry is solidified with GFRP(Glass Fiber Reinforced Plastic) grille and steel mesh slurry, and 8 reinforcement schemes adopted diagonal shear tests were carried out based on 3 kinds of GFRP gratings and 2 kinds of steel mesh. The test results show that the reinforcement method has good construction and convenient operation. The GFRP grid and steel mesh slurry reinforcement can improve the shear strength of members. The shear strength of the reinforced adobe specimens was increased by 337.5% on average and the shear strength was increased by 530.8% on average. The ductility and integrity were also significantly improved. The steel mesh itself has a certain stiffness, which has a certain contribution to the integrity and shear bearing capacity but it is easy to rust. The reinforcement of the mesh sheet mud changed the failure mode of the specimen.The mechanical properties of the reinforcement material were too rich relative to the adobe masonry, and did not fully play its mechanical properties. The GFRP grid has various advantages over the steel mesh. The reinforcement method is recommended to use of No.1 GFRP grille double layer reinforcement.