摘要
通过分别采用GFRP型材和角钢对足尺四肢角钢格构柱进行修复的对比试验,考察了格构柱修复前后承载力、刚度和破坏形态的变化,分析了结构中相关杆件修复前后应变的变化情况、GFRP型材在结构中的力学行为以及螺栓节点滑移对结构刚度的影响,研究了GFRP型材修复格构柱的效果。研究表明:螺栓节点滑移对结构刚度影响较大;GFRP型材修复后格构柱的承载力和刚度与角钢修复后的格构柱相比有小幅提高,且两者的破坏模式相同。证明了GFRP型材修复格构式结构的有效性,为FRP型材修复格构式结构应用于工程实践提供了有意义的参考。
A series of full-scale structure tests was performed to assess the effectiveness of puhruded GFRP profiles in rehabilitating lattice steel column. The data of displacements and strains of typical members and representative locations were recorded. The failure mode and ultimate strength behaviors of the original structure and the structure retrofitted by either angels or GFRP shapes were discussed. In addition, the influence of joint slippage on the structural stiffness was also studied. The experimental results show that the failure modes of the original column and the column restored using angles or puhruded GFRP elements are identical, and the ultimate strength of the specimen repaired by GFRP shapes is slightly higher than that of the specimen retrofitted by angles. Better coordination working capacity of the GFRP members is exhibited in the structure. Furthermore, joint slippage dramatically decreases the stiffness of the tested structure subjected to the transverse loading. The preliminary investigation for the feasibility of using pultruded GFRP profiles in repair of lattice steel column obtains good results and can provide reference for application of FRP profiles in the rehabilitation of lattice steel structures.
出处
《土木工程学报》
EI
CSCD
北大核心
2013年第11期89-97,共9页
China Civil Engineering Journal
基金
国家973计划(2012CB026200)
国家自然科学基金(51078077
51178099)
关键词
格构柱
GFRP型材
修复
破坏模式
承载力
节点滑移
lattice column
GFRP puhruded profiles
repair
failure mode
bearing capacity
joint slippage
