TRC加固受损砖柱轴压性能研究

Research on the axial compression properties of damaged brick columns strengthened with TRC

通过对6根纤维编织网增强混凝土(textile reinforced concrete,TRC)加固受损黏土砖柱进行轴心受压试验,研究了TRC中纤维网层数、纤维网搭接长度、纤维网表面粘砂及TRC基体掺加短切PVA纤维对砖柱轴压性能的影响。试验结果表明:采用TRC加固砖柱可明显提高其抗压强度;在一定范围内,砖柱的抗压强度随纤维网层数的增加而不断提高;纤维网搭接长度对TRC的加固效果无明显影响;在纤维网表面粘砂及在TRC基体中加入短切PVA纤维皆可提高试件的开裂荷载,其中纤维网表面粘砂试件的开裂荷载提高幅度可达33.3%,TRC基体加入短切PVA纤维后,试件开裂荷载提高幅度可达58.1%。并给出了TRC加固受损砖柱的轴压承载力计算方法,理论计算值与试验值吻合良好。

Through the axial compression test of 6 damaged clay brick columns strengthened with textile reinforced concrete(TRC),the effects of the layer number of textile layers,the lap length of textile,textile covered with sands and TRC matrix mixed with chopped PVA fiber on axial compression properties of brick columns were investigated.Test results show that:the axial compression strength of brick columns strengthened with TRC has significantly improved.Within a certain range,the compressive strength of brick columns was improved with the increase of the layer number of textile layers.The fiber lap length has no obvious effect on TRC reinforcement effect.The textile covered with sands and the TRC matrix mixed with chopped PVA fiber can improve the cracking load of brick columns.The increase rate of the cracking load of specimens that textile covered with sands increased by 33.3%.The increase rate of the cracking load of specimens that TRC matrix mixed with chopped PVA fiber increased by 58.1%.The axial compression strength formula of damaged columns strengthened with TRC was given.The calculated results have good agreement with the experimental results.