外粘复合材料加固钢筋混凝土梁的有限元静力分析

A Theoretical Exploration of Strengthening Reinforced Concrete Beam with FRP Composite Material

采用叠层梁模型并基于线源性假设 ,给出了开裂前的外粘复合材料加固钢筋混凝土梁的有限元模型 ,用 MARC软件对在对称集中静载作用下的加固梁进行了静力分析。结果表明 ,外粘复合材料 (一层 /多层 )可显著提高梁的强度与刚度。

Strengthening existing RC(Reinforced Concrete) structures has become quite prevalent in China. FRP(Fiber Reinforced Pressure ) composite material has proved to be quite useful in such strengthening. To our best knowledge, such strengthening has been done on the basis of empirical knowledge gained through testing. We aim to explore the establishment of theoretical model needed for engineering computation. In this paper, the theoretical model to be established will be used to perform engineering computation of the strengthening effect of FRP composite material layers bounded to a RC beam under the action of static symmetric loading. Based on the linear assumption for the model and the mechanical parameters of the material, we propose an effective finite element model as described in much detail in section 2. Then we use MARC software to analyze a numerical example, which is the above mentioned RC beam. The calculated results, listed in Table 5, for one or two layers of FRP composite material bounded to RC beam as compared with no strengthening, show that the strength and stiffness of RC beam is significantly increased through strengthening. The calculated results also show that the finite element model proposed by us is effective.