持载下外贴纤维布加固RC梁抗弯性能研究基于物理的实时人体动画

为了考察持续荷载作用下外贴碳纤维布(CFRP)对梁的抗弯性能的影响,进行了16根外贴CFRP加固的钢筋混凝土(RC)梁和2根对比梁的抗弯试验.试验参数为:纵筋配筋率、CFRP加固量、持载点.并对构件的各特征点的荷载、承载力及各受力阶段的刚度进行了详细的分析.试验及分析结果表明,采用CFRP加固的钢筋混凝土梁的刚度较普通钢筋混凝土梁的刚度都有明显提高,纤维布对承受以抗弯为主的构件具有增强刚度、控制挠度的作用;纤维加固时梁所承受的荷载大小,即加固时梁内已存在的弯曲裂缝的宽度对梁的屈服荷载及极限承载力影响不是很大,但对梁的刚度有较大影响,特别是对屈服阶段的刚度影响较大.其试验及分析结果对相应规范的编制及工程应用具有较高的参考价值.

Study on flexural performance of cracked RC beams retrofitted with CFRP sheets

To investigate the effects of externally bonded carbon fiber reinforced polymer(CFRP) sheets on the flexural performance of the beams strengthened at different levels of sustaining load, test of 16 RC beams retrofitted with CFRP sheets and 2 control beams was carried out. The bearing capacity and stiffness of the beams were analyzed in detail. The parameters of the test include the reinforcement ratio, quantities of CFRP sheets, and sustaining load level at the time of strengthening. The experimental and analytical results led to the conclusions summarized as follows: 1) the stiffness of cracked beams retrofitted with CFRP sheets is greater than that of the control beams. 2) the yielding load and ultimate bearing capacity of the beams are not affected by the value of the sustaining load at that load RC beams retrofitted with CFRP sheets, but affect the stiffness of the beams, especially the average tangent stiffness after rebar yielding. The experimental and analytical results are valuable for authorizing codes and for practical engineering.