受压方木柱在复合材料环向和螺旋约束下的失效行为分析  

Failure behaviour of square timber columns confined by hoop and helix arrangements of FRP under axial compression

作　　者：梁危 袁书成[1] 王清远[1] 董江峰[1] 

机构地区：[1]四川大学建筑与环境学院,成都610065

出　　处：《建筑结构》2014年第9期89-92,共4页Building Structure

基　　金：国家杰出青年基金资助项目(10925211);教育部创新团队计划资助项目(IRT1027)

摘　　要：采用碳纤维布(CFRP)和芳纶纤维布(AFRP)加固8根方木柱,通过轴心抗压性能试验,研究了不同加固层数和FRP全包、环向、螺旋等不同加固方式对木柱抗压承载力的影响,分析了纤维复合材料加固木柱的失效机理、荷载-位移及荷载-应变关系。结果表明,经FRP加固后,受压木柱抗压承载力得到显著提高,最大提高幅度为57.5%;由于FRP的横向约束作用,木柱的延性得到有效改善,且不同的加固方式对木柱延性的提高幅度差别较大,其中全包加固方式下木柱延性的提高幅度最大,环向加固方式优于螺旋加固方式。Eight timber columns reinforced by CFRP and AFRP with various enwrapping forms were fabricated and studied. Based on the axial compressive test, the compressive bearing capacities of specimens with different FRP reinforcement layers and forms, including entire, hooped and spiral methods, were tested. And the damage form of specimens, the load- displacement relationship and the load-strain relationship were analyzed. Test results showed that the reinforcement with FRP can obviously improve the compressive bearing capacity of the columns and the highest improve ratio is 57.5%. In addition, the lateral deformations of reinforced specimen is greatly constrained by FRP, so the ductility can be improved. And different reinforcement methods can improve the ductility of timber columns on different level. The result indicated that the ductility of timber columns is enhanced more notably in the specimen with full wrapping arrangement, and the hooped reinforcement form is better than the spiral way.

关 键 词：纤维布 木结构 加固 失效 

分 类 号：TU366.2[建筑科学—结构工程] TB332[一般工业技术—材料科学与工程]