预制夹芯保温墙体FRP连接件抗剪性能加速老化试验研究  

Accelerated aging tests for evaluation of shear behavior of FRP connectors in precast sandwich insulation wall panels

作　　者：薛伟辰[1] 付凯[1] 李向民[2] 

机构地区：[1]同济大学建筑工程系,上海200092 [2]上海建科院上海市工程结构新技术重点实验室,上海200032

出　　处：《建筑结构》2012年第7期106-108,118,共4页Building Structure

基　　金：国家自然科学基金项目(50978193);上海市科学技术委员会科研计划项目(10dz1202200;10dz0583700)

摘　　要：为实现预制夹芯保温墙体主体结构与围护结构同寿命,有必要开展混凝土环境下预制夹芯保温墙体纤维增强塑料(FRP)连接件的力学性能(主要是层间剪切性能)的加速老化试验研究。基于ACI 440.3R-04规定的试验方法,将30根预制夹芯保温墙体FRP连接件浸入60℃的模拟混凝土溶液中进行加速老化试验,侵蚀时间分别为3.65,18,36.5,92,183d,主要分析了侵蚀时间对FRP连接件层间剪切强度的影响。研究表明,在60℃模拟混凝土溶液环境下,FRP连接件的层间剪切强度早期退化较快,侵蚀36.5d后,退化速率逐渐变缓;侵蚀36.5d和183d后,FRP连接件的层间剪切强度分别下降了17.22%和26.89%。扫描电子显微镜(SEM)的观测表明,侵蚀后FRP连接件劣化区域内的纤维与周围树脂之间出现了明显的脱粘现象,而且随着侵蚀时间的增加这种脱粘现象更加明显。In order to make the main structure of the precast sandwich insulation wall panel to have the same life with building envelope,it is necessary to conduct the accelerated aging tests for evaluation of mechanical property（mainly its interlaminar shear strength） for FRP connectors under simulated concrete environment.According to the ACI 440.3R-04,the test consisting of 30 FRP connectors in 60℃ of simulated concrete environment for 3.65,18,36.5,92,183d was conducted to evaluate the interlaminar shear strength of FRP connectors under simulated concrete environment.The results show that,with the aging time,the interlaminar shear strength of FRP connectors decreased significantly before 36.5d.After being exposed to simulated concrete environment for 36.5,183d,interlaminar shear strength degradation of FRP connectors were 17.22%and 26.89% respectively.The micro-formation of the FRP connectors＇ surface was surveyed under scanning electron microscopy（SEM）,and it indicates that the bonds between fiber and resin of FRP connectors in the corrosion region become loose,and with the corrosion time increased,the interfacial debonding between fiber and resin of FRP connectors becomes more significant.

关 键 词：预制夹芯保温墙体 FRP连接件 模拟混凝土环境 抗剪性能 

分 类 号：TU377.4[建筑科学—结构工程]