粘贴CFRP板加固钢筋混凝土梁的长期变形性能试验研究与数值模拟

LONG-TERM DEFORMATION BEHAVIOR OF REINFORCED CONCRETE BEAMS STRENGTHENED WITH CFRP PLATE EXPERIMENTAL RESEARCH AND NUMERICAL SIMULATION

为了研究实际工程中粘贴CFRP板加固钢筋混凝土梁的长期变形性能,从而为加固梁在长期使用过程中是否满足结构的正常使用极限状态提供判断依据,并解决长期试验操作难度大、时间跨度长的问题,进行了粘贴CFRP板加固钢筋混凝土梁的加固以及粘贴CFRP板加固钢筋混凝土梁在持续荷载作用下的长期变形试验,建立了用于计算粘贴CFRP板加固钢筋混凝土梁的长期变形的非线性有限元模型。数值计算结果与试验结果吻合较好。利用该模型对粘贴不同厚度CFRP板的加固梁的长期变形进行了数值计算,结果表明CFRP板对加固梁的长期变形的影响不明显,其总变形的减小主要来源于CFRP板对瞬时变形的约束。

In order to study the long-term deformation performance of RC beams strengthened with CFRP plates in practical engineering and to provide a basis for the judgment of whether the strengthened beam meets the normal service limit state of the structure during the long-term use,and to solve the problems that the long-term test operation is difficult and the time span is too long,the long-term deformation test of reinforced concrete beams strengthened with CFRP sheets is carried out under continuous load. A nonlinear finite element model for calculating longterm deformation of reinforced concrete beams strengthened with CFRP sheets is established. The results of numerical calculation are in good agreement with the experimental results. The long-term deformation of reinforced beams with different thickness of CFRP plates is numerically calculated by using this model. The results show that CFRP plate has little effect on the long-term deformation of reinforced beams,and the total deformation decreases mainly from the restriction of CFRP plates to the instantaneous deformation.