CFRP板加固箱梁桥顶板在沥青面层施工高温作用后的疲劳性能

为了研究沥青面层施工时的高温对公铁两用CFRP板加固的箱梁桥顶板疲劳性能的影响,在室内对粘贴CFRP板前后的钢筋混凝土梁进行了高温环境下的疲劳模拟对比试验.从钢筋、混凝土、CFRP应变的角度,开展了高温对粘贴CFRP板的钢筋混凝土试验梁疲劳裂缝发展、挠度增长规律、黏结胶层及界面应力影响的研究.结果表明:经过高温阶段后粘贴CFRP板的钢筋混凝土梁在疲劳强度、刚度、阻止裂缝发展、抗弯极限承载能力等方面都比未粘贴CFRP板前有所提高.极限承载能力提高了24.6%,刚度提高了23.0%,平均最大裂缝减小了15.2%.

Fatigue performance of CFRP reinforced box girder bridge top slab subjected to high temperature impact during asphaltpavement construction

In order to research the fatigue performance on CFRP(carbon fiber reinforced polymer) reinforced box girder bridge top slab influence of high temperature during asphaltpavement construction,the armoured concrete girders with and without affixed CFRP were tested in the laboratory for fatigue simulation comparsison under high temperature condition.The strains of steel bar,concrete and CFRP were adopted as parameters to research the influence of high temperature on fatigue crack evolution,deflection increment rule and the CFRP adhesive normal stress.The results show that the armoured concrete girders with affixed CFRP fatigue performance subjected to high temperature has distinctness enhance contrast to that without affixed CFRP,such as the fatigue strength,the stiffness,the resist crack evolution and the limit flexural loading capacity.As example,The limit carrying capacity is increased by 24.6%,the stiffness is increased by 23.0% and the mean maximize crack is decreased by 15.2%.