复合材料或钢板加固RC梁的板端剥离破坏承载力

 对受拉表面粘贴纤维增强复合材料( Fibre reinforced polymer/ plastic , FRP)或钢板的抗弯加固钢筋混凝土(Reinforced concrete , RC)梁的板端剥离破坏承载力进行了较为细致的研究。在分析关键参数、 试验数据及现 有计算模型的基础上 , 提出了一个简单、 合理的板端剥离破坏承载力计算新模型。该模型首先给出板端位于纯弯 区的弯曲剥离和板端位于弯矩为零或接近于零的主剪区的剪切剥离的承载力计算公式 , 进而采用简洁的相关曲线 确定板端在弯2剪共同作用区的剥离承载力。新模型通过包含未加固梁的抗剪承载力和几个物理意义明确的重要 参数 , 充分反映了抗弯加固梁的剥离破坏机制 , 与试验结果吻合良好 , 使用方便 , 可供制订规范和实际加固工程 设计时参考应用。

Plate end debonding failure loads of FRP-or steel-plated RC beams

Plate end debonding failure loads of RC beams st rengthened in flexure by bonding an FRP or steel plate to the tension face were investigated in detail . Based on studies of the cont rolling parameters , the available test data and comparisons of these test data with existing debonding strength models , a simple , rationally- based predictive model for plate end debonding failure loads was presented. In this model , pure flexural debonding for a plate end located in a pure bending region and pure shear debonding for a plate end located in a high- shear zero (or low) -moment region are first dealt with. The general case of a plate end under the combined action of shear and bending is treated as the interaction of these two ext reme conditions. The proposed model is shown to be accurate through comparisons with available test results. The model relates the debonding failure load to the shear capacity of the beam and a number of well2defined parameters , and can be easily incorporated in future design codes and guidelines , and may be used in practical applications.