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为了研究沥青面层施工时的高温碾压对公铁两用CFRP板加固的箱梁桥顶板刚度性能的影响,在室内对粘贴CFRP板的钢筋混凝土梁进行高温碾压作用后的刚度模拟对比试验,从加固受拉区和受压区以及CFRP板弹性模量变化时试件刚度变化的角度,开展了高温碾压对粘贴CFRP板的钢筋混凝土试验梁极限承载能力、刚度影响的研究。研究表明,经过高温碾压阶段后粘贴弹性模量分别为150GPa、180GPa和200GPa的CFRP板的钢筋混凝土梁在极限承载力和刚度方面比未粘贴CFRP板前分别有提高:极限承载力分别提高158%、190%和211%、刚度分别提高79%、89%和96%。研究结果对沥青面层施工高温碾压作用后采用粘贴CFRP板的加固技术达到提升桥梁刚度具有指导意义。
In order to study the effect of high temperature rolling on the rigidity of the roof of a box girder reinforced by the railway dual-use CFRP sheet during the construction of asphalt pavement, the stiffness simulation comparison test of the indoor reinforced concrete beams with CFRP sheet after high temperature rolling The influence of high temperature rolling on the ultimate bearing capacity and stiffness of reinforced concrete specimens bonded with CFRP plates was studied from the perspective of the stiffness variation of the tension zone and the compression zone and the change of the elastic modulus of the CFRP sheet. The results show that the RC beams with CFRP plates with elastic modulus of 150GPa, 180GPa and 200GPa, respectively, have higher ultimate load and stiffness than those without CFRP plate after the high temperature rolling stage: the ultimate bearing capacity increases by 158% , 190% and 211% respectively, and their stiffness increased by 79%, 89% and 96% respectively. The results of the study show that it is instructive to improve the rigidity of the bridge by applying the reinforcement technology of CFRP board after the high-temperature roller compaction of asphalt surface construction.