梁侧锚钢加固钢筋混凝土梁火灾后受剪性能

为了研究梁侧锚钢加固钢筋混凝土梁（BSP梁）受火后的受剪性能，对1根未加固的对比梁、2根BSP常温梁和2根BSP高温梁进行四点弯曲受剪试验.考察各试件的破坏模式、荷载-挠度曲线、钢筋和钢板应变等情况，分析钢板宽度、植筋胶类型和是否受火对BSP试件受剪承载力、刚度、延性的影响.结果表明：受火后BSP梁的受剪承载力、延性和刚度明显降低；增大钢板宽度可以有效提高火灾后BSP梁的受剪承载力和延性，使试件由脆性的剪压破坏向延性的弯曲破坏转变；氯氧镁水泥作为植筋胶在提高常温试件受剪承载力和延性方面比HIT-RE 500更有效，但在提高刚度方面效果略低.
Abstract: Four-point bending shear test was conducted for an unreinforced control beam, two BSP beams under room temperature and two post-fire BSP beams in order to study the post-fire shear performance of the reinforced concrete beams strengthened by bolted side-plating (BSP) technique. The failure modes, the load-displacement curves, and the strains of reinforcement and steel plates wereobserved.The variation of the shear capacity, stiffness and ductility as the depth of steel plates, types of anchor adhesive,and the temperature was analysed. Results show that the high temperature can decrease RC beams in shear capacity, ductilityand stiffness.Increasing plate depth can improve the shear capacity and the ductility of post-fire BSP specimens, and transform the failure modes from brittle shear-compression failure into ductile flexural failure.The magnesium oxychloride cement was more effective in the improvement of shear capacity and ductility at the expense of lower stiffness compared to the anchor adhesive of the HIT-RE 500.