纤维复合材料自锁式锚固体系力学性能试验研究  

Experimental Research on Mechanical Performance of Self-locking Anchor System for Pre-stressed FRP Sheets

作　　者：周长东[1,2] 李季[3] 吕西林[2] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]同济大学土木工程防灾国家重点实验室,上海200092 [3]中国建筑设计研究院,北京100044

出　　处：《建筑材料学报》2012年第6期829-835,共7页Journal of Building Materials

基　　金：国家自然科学基金面上项目(50978021);同济大学土木工程防灾国家重点实验室开放基金资助项目(SLDRCE08-MB-01);中央高校基本科研业务费项目(2011JBM080)

摘　　要：纤维复合材料自锁式锚固体系由锚头、螺栓和高强纤维布组成,其中的高强纤维布采用的是未刷胶的纤维复合材料(fiber reinforced polymer,FRP)片材.针对4组未刷胶碳纤维布(carbonfiber reinforced polymer,CFRP)试件进行了轴向拉伸试验,考虑了断裂形式、极限荷载和弹性模量等影响因素,结果表明:与刷胶后的碳纤维布相比,未刷胶碳纤维布的破坏应力降低约50%,弹性模量降低13%,其力学性能有所下降;对7组经过了850h大气环境暴露、不同预应力作用下的自锁式锚具试件进行了破坏性试验,结果表明:锚头形式对碳纤维布断裂形式影响最大,方端锚头为剪切破坏,圆端锚头为受拉破坏.力学推导结果表明,碳纤维布抗拉强度约为其抗剪强度的20倍,剪切破坏随着混凝土墩柱直径的增长而延缓发生.The self-locking anchor（SLA） system for fiber reinforced polymer（FRP） comprises two anchor heads, bolts and FRP. Unlike the FRP sheets, sheets used for the SLA are without epoxy resin. The axial extension tests were conducted on 4 groups of carbon fiber sheet, with the main parameters being fracture modes, ultimate loads and elastic modulus. Based on the test results, the breaking stress of the carbon fiber sheet without epoxy resin was about 50% of the carbon fiber sheet with it, and the elastic modulus re- duced by 13%. The mechanical properties of carbon fiber sheet without epoxy resin were lower than ihose with epoxy resin. 7 groups of SLA were loaded till failure after 850 hours of environmental exposure under different pre-stress. The test result shows that shape of anchor heads affects the failure mode of the carbon fiber sheet mostly. The failure mode of specimens in which the anchor heads are of square end is the shear failure of carbon fiber sheet, while it is the tension failure for specimens in which the anchor heads are of round end. It can be found from mechanical deduction that the tensile strength of the carbon fiber sheet is about 20 times of their shear strength. The shear failure mode will be delayed with the increase of the diameter of concrete columns.

关 键 词：自锁式锚固体系 纤维增强塑料 环向预应力 长期性能 

分 类 号：TU502.6[建筑科学—建筑技术科学] TU375.3