CFL加固RC梁界面端附近应力的数值分析

Numerical analysis of stresses near interface edge in RC beam strengthened with CFL

基于有限元方法,文章研究了碳纤维板(CFL)加固钢筋混凝土(RC)梁分别受温度变化和集中载荷作用时加固端部界面端附近的奇异应力分布规律。将RC梁等效为具有5层的层合梁,分析了加固长度、CFL的厚度及其端部结合角对界面端附近应力的影响。结果表明,在界面端附近由集中载荷作用产生的应力与由升温产生的热应力具有相似的分布规律;随着距界面端距离的减小,界面端附近应力表现出比较明显的应力奇异性;合理增加加固长度、减小CFL的厚度及其端部结合角均能有效地降低界面端附近的应力。

Based on the finite element method, the distribution law of singular stresses near the inter- face edge in the reinforced concrete（RC） beam strengthened with a carbon fiber laminate（CFL） is ana- lyzed numerically under the concentrated load and temperature change respectively. The influence of the strengthened length and the thickness as well as the bonded angle at the end of the CFL on the sin- gular stresses near the interface edge is discussed by transfering the RC beam into a laminated beam with five layers. The results show that the stresses near the interface edge caused by the temperature rise are similar to those by the concentrated load. The stresses near the interface edge show obvious stress singularity with the decrease of the distance from the interface edge. The reasonable increase of the strengthened length, the decrease of the thickness and bonded angle at the end of the CFL can ef- fectively reduce the stresses near the interface edge.