混凝土徐变对碳纤维片材加固混凝土梁抗弯承载力的影响

Effect of concrete creep on flexural bearing capacity of concrete beams strengthened with CFRP laminates

基于钢筋混凝土梁在持续荷载作用下混凝土的应力-应变本构关系,研究混凝土徐变对碳纤维片材加固混凝土梁抗弯承载力的影响规律.根据算例分析,得出随着持续荷载水平的提高,加固混凝土梁的抗弯承载力逐渐减小,抗弯承载力的增加值降低系数逐渐增大,混凝土徐变变形使碳纤维片材加固混凝土梁的抗弯承载力增加值降低2.6%左右的结果.该结果可为碳纤维片材加固混凝土结构设计提供参考.

Based on the stress-strain model of reinforced concrete beams under sustained loads, the influence of concrete creep on flexural beating capacity of concrete beams strengthened with CFRP laminates was studied. The results show that the flexural beating capacity of concrete beams decreases and the reduction coefficient of the added value of flexural beating capacity increases with the increase of the sustained load, and the added value of the flexural bearing capacity of concrete beams strengthened with CFRP laminates decreases by about 2.6%. These results can provide a reference for the design of concrete structures strengthened with CFRP laminates.