碳纤维薄板增强RC梁界面温度应力理论分析

以碳纤维薄板（CFL）为研究对象，考虑了增强钢筋混凝土（RC）梁和CFL薄板的剪切变形，并着重研究了温度变化对界面应力的影响，推导出在温度变化和力载荷作用下CFL增强RC梁界面应力分布公式。温度变化引起的界面应力分布为：在界面两端出现高应力集中，端部的应力值最大，应力在端部附近迅速下降到一个稳定值。在△T=50℃；q=50kN／m的载荷水平下，温度变化产生的最大剪应力为1．7MPa，最大正应力为1．3MPa，均布载荷作用下产生的最大剪应力为0．8MPa，最大正应力为0．7MPa。在对碳纤维薄板（CFL）增强钢筋混凝土（Re）梁进行设计时考虑温度应力的影响是十分必要的。

Interfacial Thermal Stresses Analysis of RC Beams Strengthened with CFL

In order to research the carbon fibers laminate （CFL）, considering the shear deformation of the reinforced concrete （RC） beams and CFL laminate and focusing on study of the effect of temperature change on the stresses along the interface, an analytical solution was presented to calculate the interface stresses in the RC beams strengthened with CFL under mechanical loads and temperature effect. The stresses along the interface for temperature effect are as follow： high stresses concentrations occur at the end of the CFL, the maximum stresses are also occur there, the stresses disappear quickly in a very short distance at the ends of the CFL. When △ T = 50 ℃ ; q = 50 kN/m, the maximum shear stress is 1.7 MPa and normal stress 1.3 MP for temperature effect, for the uniformly distributed load （UDL） are 0.8 MPa and 0. 7 MPa. So, it is very necessary to take into account the temperature effect in designing the beams strengthened with CFL.