纵向侧贴预应力碳纤维布加固连续梁的试验与有限元分析

Test and Finite Element Analysis of the Continuous Beams Side-Bonded with Pre-stressed CFRP Sheets on the Longitudinal Direction

为研究负载作用下纵向侧贴预应力碳纤维布加固钢筋混凝土连续梁的受力性能,制作了4根2跨连续梁,其中1根未加固,3根加固。在加固梁每跨下部纵向侧贴预应力碳纤维布,中间支座上部纵向侧贴非预应力碳纤维布。通过静载试验,得到了连续梁的受弯承载力、变形、裂缝等试验数据。同时,利用非线性有限元分析软件ABAQUS对试验梁进行数值模拟,并与试验结果比较。结果表明:负载作用下纵向侧贴预应力碳纤维布加固钢筋混凝土连续梁能显著提高屈服荷载和极限荷载,预应力碳纤维布的存在提高了连续梁的刚度,减小了连续梁的变形;预应力水平越高,屈服荷载提高和变形减少越明显;利用ABAQUS非线性有限元分析结果与试验结果吻合较好,可为类似的加固设计和试验提供参考。

In order to study the mechanical properties of the reinforced concrete continuous beam side-bonded with pre-stressed CFRP sheets on the longitudinal direction under the initial load, four two-span continuous beams including one unreinforced beam and three reinforced beams are investigated. Pre-stressed CFRP sheets were side-bonded on the lower part of the reinforced beam on each cross, and CFRP sheets were side-bonded on the upper part of the middle bearing. The test data such as bearing capacity, deformation and cracks were obtained in every loading stage by the static test. At the same time, the nonlinear finite analysis on the test beams was carried out by ABAQUS software, and the results of finite element analysis were compared with the experiment. The test results show that the yield load and the limit load of the continuous beams side-bonded with pre-stressed CFRP sheet on the longitudinal direction can be improved obviously. In addition, the stiffness of the continuous beam side-bonded with pre-stressed CFRP sheets can be increased, but its deformation can be reduced. The higher the pre-stressed level is, the higher the value of yield load is and the smaller value of the deformation is. The results of nonlinear finite element analysis of the test beams based on the software ABAQUS have good agreement with the test results, so it can provide reference for the similar structure design and test.