玻璃纤维增强复材条带与钢纤维砂浆加固损伤柱轴心受压试验研究  

EXPERIMENTAL STUDY ON DAMAGED COLUMNS STRENGTHENED WITH GFRP STRIP AND STEEL FIBER MORTAR UNDER AXIAL COMPRESSION

作　　者：李哲[1] 王志立 邢乐阳 LI Zhe;WANG Zhili;XING Leyang(School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China)

机构地区：[1]西安理工大学土木建筑工程学院,西安710048

出　　处：《工业建筑》2021年第2期193-198,共6页Industrial Construction

基　　金：国家自然科学基金项目(51608441);陕西省自然科学基金项目(2017JQ5032)。

摘　　要：通过对1根未加固混凝土(RC)柱和4根加固损伤混凝土(RC)柱进行轴压试验,研究了玻璃纤维增强复材(GFRP)条带及钢纤维砂浆复合加固不同损伤程度RC方柱的轴压性能。分析了同等损伤情况下,GFRP条带对钢纤维砂浆加固损伤RC柱的约束作用;不同损伤情况下,复合加固RC柱的承载力、刚度、延性。结果表明:GFRP条带可以显著提高钢纤维砂浆加固RC柱的承载能力和延性;复合加固后损伤RC柱的承载能力显著提高,但提高幅度会随着损伤程度的增大而降低;试件轴压刚度随着损伤程度的增大而降低。基于试验建立了复合加固损伤RC方形截面短柱的轴压承载力计算式,计算值与试验结果吻合良好。Through the axial compression test of one RC square-section short column and four RC square-section short columns strengthened with composite reinforcement,the axial compression performance of the damaged RC squaresection short column strengthened with GFRP sleeve and steel fiber mortar was studied.The restraint effect of GFRP strips on RC columns strengthened with steel fiber mortar was analyzed;under different damage conditions,the bearing capacity,stiffness and ductility of RC columns strengthened with GFRP strips and steel fiber mortar were analyzed.The test results showed that GFRP strip could significantly improve the bearing capacity and ductility of RC columns strengthened with steel fiber mortar;the bearing capacity of damaged RC columns was significantly improved after GFRP strip and steel fiber mortar composite reinforcement,under the same conditions,the improvement rate of the bearing capacity of the composite reinforced column decreaseed with the increase of the degree of damaged RC columns,and the reinforcement effect was obvious in a certain degree,the reinforcement effect was weakened beyond this degree of damage.The axial compression stiffness of the specimen decreased with the increase of damage degree.On the basis of experimental study,the calculation formula of axial bearing capacity of composite reinforced RC short column with square-section was established,and the results were in good agreement with the experimental data.

关 键 词：GFRP条带 钢纤维砂浆 复合加固 损伤 轴压性能 

分 类 号：TU37[建筑科学—结构工程]