预应力CFRP板加固混凝土梁的挠度计算方法

Deflection calculation method of concrete beams strengthened with prestressed CFRP plates

普通表层粘贴CFRP板对提高正常使用阶段梁的变形能力作用有限,通过施加预应力研究了预应力CFRP板加固梁的挠度计算方法,对现有混凝土梁挠度计算方法(直接双线法、有效惯性矩法及曲率积分法)的优缺点进行了对比,总结出适用于预应力CFRP板加固混凝土梁的挠度计算公式。通过计算结果与预应力CFRP板加固混凝土梁试验结果的对比发现,理论值与试验值吻合良好。

The normal surface sticking method has a limited effect on improving the deformation capacity of beams at the normal use stage, which can be overcome by applying prestress to CFRP. In order to study the deflection calculation method of concrete beams strengthened with prestressed CFRP plates,the existing deflection calculation methods of concrete beams were summarized and studied.The advantages and disadvantages of three deflection calculation methods of concrete beams were compared, namely direct double line method, effective moment of inertia method and curvature integral method.A calculation formula for deflection of concrete beams strengthened with prestressed CFRP plates is proposed. The comparison between the calculated results and the test results of concrete beams strengthened with prestressed CFRP plates shows that the theoretical values are in good agreement with the test values.