预应力碳纤维布加固混凝土梁的抗弯承载力计算

在碳纤维布和预应力碳纤维布加固混凝土梁试验研究成果的基础上,对预应力碳纤维布加固混凝土梁的破坏形式进行了分析.利用等效转化原则将混凝土的非线性应力图形转化为等效矩形应力图形计算,在此基础上提出抗弯承载力计算公式.对二次受力情况进行了分析,提出了滞后应变的计算公式.经与试验结果比较,公式计算值与试验值吻合良好.

Calculation of flexural capacity for concrete beams reinforced with prestressed CFRP sheets

Based on experimental research on concrete beams reinforced with CFRP sheets and prestressed CFRP sheets,a preliminary study was performed on the flexural performance and failure modes of concrete beams reinforced with prestressed CFRP sheets.In the study,the nonlinear stress distribution on the cross-section was transformed to the equivalent rectangle for calculation,and a formula for calculation of flexural capacity was deduced.Furthermore,a calculation formula for strain lag was worked out according to stress analysis of concrete beams under secondary loading.The calculated result of the present method agrees well with measured data.