持续荷载作用下混凝土梁中玻璃纤维增强复合材料筋抗拉性能试验研究  

TEST FOR TENSILE PROPERTIES OF GFRP BARS EMBEDDED IN CONCRETE BEAMS UNDER SUSTAINED LOADING

作　　者：代力[1] 何雄君[1] 杨文瑞[1] 王江[1] 

机构地区：[1]武汉理工大学交通学院,武汉430063

出　　处：《工业建筑》2016年第3期5-8,33,共5页Industrial Construction

基　　金：国家自然科学基金项目(51178361)

摘　　要：通过对真实混凝土环境下玻璃纤维增强复合材料(GFRP)筋的耐久性试验,研究混凝土构件服役状态时所承受的静荷载、裂缝等因素对GFRP筋抗拉强度的影响,并与模拟混凝土孔隙水溶液碱环境下GFRP筋的抗拉强度退化率进行对比分析。试验结果表明:静荷载对混凝土环境作用下GFRP筋抗拉强度的退化有一定的影响,随着荷载的增大,筋体强度退化率也越快;GFRP筋抗拉强度退化率在有工作裂缝的混凝土试件中大于无工作裂缝混凝土环境;模拟混凝土碱环境下浸泡的GFRP筋长期力学性能退化率较快,与实际混凝土环境下GFRP筋的退化规律相比存在一定的偏差,因此,相应试验数据以及在此基础上建立的抗拉强度退化模型偏于保守。According to the durability test of GFRP bar under actual concrete under sustained loading,it was studied the influence of the load and cracks etc of in-service concrete members on GFRP bar＇s tensile strength,which was compared to the degradation rate of the tensile strength of GFRP bars in simulated alkaline environment of concrete pore water. The test results showed that the sustained load had a certain influence on the degradation of the tensile strength of GFRP bars in concrete environment,the degradation rate was accelerated with the increase of loading level. Moreover,the degradation rate that in the concrete specimens with work cracks was larger than that of non-work cracks. The long-term mechanical properties degradation rate of GFRP bars in simulated alkaline environment of concrete was faster,compared with the actual concrete environment the degradation law had a certain deviation.Hence the corresponding test data and tensile strength prediction model based on the test data were conservative.

关 键 词：混凝土环境 玻璃纤维增强复合材料 持续荷载 裂缝 抗拉强度 

分 类 号：TU377.9[建筑科学—结构工程] TU599