FRP(纤维增强聚合物)片材单面搭接性能分析  

BEHAVIORS OF FRP (FIBER REINFORCED POLYMER) SINGLE LAP BOND

作　　者：李杉[1] 任慧韬[1] 黄承逵[1] 崔云飞[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《工程力学》2009年第8期251-256,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(50608013);国家重大基础研究前期研究专项基金项目(2004CCA04100)

摘　　要：《碳纤维片材加固修复混凝土结构施工技术规程》给出了CFRP(碳纤维增强聚合物)与CFRP搭接长度不应小于100mm,其合理性仍需要进一步研究分析。该文根据单面搭接一维经典弹性理论,考虑胶层的弹塑性,推导了FRP单面搭接"有效搭接长度"的计算公式。并手工制作了12组FRP单面搭接试件,对搭接试件进行静力拉伸试验,考察了FRP与FRP界面的粘结应力分布,对有效搭接长度进行了分析。试验结果分析表明:对任何搭接长度,最大剪应力发生在搭接的端部区域;CFRP的有效搭接长度大约在75mm―100mm,GFRP(玻璃纤维增强聚合物)的有效搭接长度大约在100mm―125mm之间,公式计算的有效长度与试验结果基本吻合。所得结论为CFRP片材加固混凝土技术规程提供一定的参考。In ＂Technical Specifications for Strengthening Concrete Structures with Carbon Fiber Reinforced Polymer Laminate＂, the overlap length of CFRP （carbon fiber reinforced polymer） is required to be 100mm at least. To examine the rationality of this requirement, based on the classical elasticity theory and elastic -plastic property of adhesive, a simplified formula to calculate the effective bond length of FRP single lap bond （SLB） is presented. Twelve groups of FRP SLB specimens were made by hand, and they were tested under static loading. The shear stress distribution in the overlap zone was measured, which leads to the derivation of the effective bond length of FRP SLB. The test results indicate that the maximum shear stress occurs at the ends of the overlap zone for any overlap length; and the effective bond length is estimated to be between 75 mm and 100 mm in Carbon specimens and between 100 mm and 125 mm in Glass specimens. The computed results using the presented formula were in agreement with experimental ones. This study confirms the requirement in ＂Technical Specification for Strengthening Concrete Structures with Carbon Fiber Reinforced Polymer Laminate＂.

关 键 词：纤维增强聚合物 单面搭接 有效搭接长度 粘结应力 试验研究 

分 类 号：TU528.572[建筑科学—建筑技术科学]