粘贴钢板加固钢筋混凝土梁的分离式有限元模型

提出了外粘钢板加固受弯钢筋混凝土梁的非线性有限元模型。该模型中采用了一种特殊的、具有剥离破坏功能的界面单元来模拟混凝土梁和外粘钢板之间的粘结层,这种剥离破坏主要发生在粘贴钢板端部区域和弯曲、剪切裂缝附近。影响这种剥离破坏的主要因素有两个:一是粘贴钢板的端部与加固梁支座距离;二是粘贴钢板的厚度。传统的梁理论不能描述这种加固梁破坏模式,采用有限元方法能全方位地描述这种加固梁的各种性状和破坏模式。数值计算结果与粘贴不同厚度钢板加固梁的试验结果相吻合。

SEPARATE FINITE ELEMENT MODELING OF REINFORCED CONCRETE BEAMS BONDED WITH STEEL PLATES

The nonlinear finite element model for the flexural reinforced concrete beams strengthened with epoxy bonded steel plates is presented. The model includes a special interface element, which is used to simulate the thin epoxy adhesive layer of the plate-bonded beam and which allows for the peel failure at the plate cut-off zone and or in the vicinity of flexure and shear cracks. This particular failure depends on two factors such as the distance of plate end from the support and plate thickness. Since the conventional beam theory can not predict the failure of such beams, this finite element model capable of predicting the overall behavior of strengthened beams including different failure modes accurately is developed. The numerical results show close agreement with experimental data available for a reinforced concrete beam strengthened by plates of variant thickness.