粘钢加固RC梁承载性能的理论和试验研究

Theoretical and experimental research on bearing behavior of RC beams strengthened by bonded steel plates

通过33根RC梁的试验,对不同粘钢位置、不同板件宽厚比和粘钢量加固的RC梁进行了全过程的理论与试验研究。基于对粘钢加固RC梁在荷载作用下的变形过程和破坏形式的观察,讨论了钢板宽厚比、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,得到了粘钢与RC梁之间的协调工作系数主要随截面相对受压区高度变化的结论,提出了粘钢加固RC梁协调工作系数、抗弯承载能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,为工程实际中粘钢加固RC梁的设计和承载能力的确定提供了依据。

By conducting tests on 33 beams, RC beams strengthened at different positions with various quantities of bonded steel plates of various width-to-thickness ratios and areas are theoretically and experimentally studied. Based on the observation of the deformation process and destruction modes of those glued-steel RC beams under loading tests, the effects of width-to-thickness ratios, positions and areas of steel plates on the behavior of the beams, such as short period rigidity, bending deflection, cracking load, ultimate load and destruction modes, are discussed. Through comparing the theoretical results with the tests, it is found that the coordinate-working coefficient of glued-steel RC beam varies mainly with the relative depth of the compression zone. Formulations are proposed for calculating the coordinate-working coefficients, bending bearing capacity and deflections. Design suggestions and technical measures to decide the suitable width-to-thickness ratios, positions and areas of clued-steel RC beams are also presented.