粘钢加固RC梁的正截面承载力

Normal Section Bearing Capacity of RC Beams Strengthened by Bonded Steel Plates

对粘钢加固RC梁在荷载作用下的变形过程和破坏形式进行了理论和试验研究,讨论了粘钢位置和粘钢量对RC梁的短期刚度、挠度、开裂荷载、极限荷载和破坏形式等承载性能的影响,通过理论计算结果与试验结果的比较分析,得出了粘钢加固RC梁承载力折减系数主要随截面相对高度变化的结论,提出了粘钢加固RC梁承载力折减系数、抗弯承载力和挠度的计算公式,给出了工程设计建议和确定合适钢板宽厚比、粘钢位置和粘钢量的技术措施,为粘钢加固RC梁的设计和承载力确定提供了参考依据。

By accomplishing tests of some RC beams, the deformation processes and destruction modes of those glued-steel RC beams under loading tests were carried out. The effects of amount of glued-steel, positions and areas of steel plates on the bearing behavior of the RC beams, such as short period rigidity, deflection, cracked load, ultimate load and destruction modes were discussed. Through compared the theoretical results with the tested ones, it was found that the reduction coefficients of bearing capacity of glued-steel RC beams were mainly varied with the relative depth of compression zone. The formulations of calculating reduction coefficients, bearing capacity of bending and deflections were put forward. The designing suggestions and technique measures to decide the suitable width-to-thickness ratios, positions and areas of gluedsteel RC beams were also presented. All these can be acted as the good reference for designing and determining bearing capacity of the RC beams strengthened by bonded steel plates.