预应力CFRP与钢板复合加固T梁抗弯性能试验

通过对10根T梁进行抗弯试验，研究了不同CFRP预应力程度、CFRP加固层数及预裂程度对CFRP与钢板复合加固T梁的荷载、跨中挠度及延性系数的影响规律.结果表明:复合加固T梁的极限荷载P_○u高于对比梁的90%以上.预应力程度对极限跨中挠度f_○max及延性系数μ影响明显，预应力每提高5%，f_○max降低约25%.屈服荷载P_○y与极限荷载P_○u随加固层数的增加线性增大，随预裂程度的增加线性减小.3层比1层CFRP梁的P_○u提高了52.8%.预裂程度为60%时，f_○max降低约10%.

Experimental Research on Flexural Behavior of T-Beams Strengthened with Combination of Prestressed CFRP and Steel Plate

Through the experiments on the flexural behaviors of 10 pieces of T-beams， the influence of different prestress degrees， numbers of strengthening layers of CFRP as well as the pre-splitting degree on the load， midspan deflection and ductility factor of T-beams strengthened by the combination of CFRP and steel plate were studied. The results showed that the ultimate load P_○u of the strengthened T-beam is over 90% higher than that of the comparison beam. The impact of prestress degree on the ultimate midspan deflection f_○max and the ductility factor μ is obvious in such a way that the f_○max reduces about 25% when the prestressing force increases 5%. The yield load P_○y and the ultimate load P_○u increase linearly with the increase of the strengthening layers， and decrease linearly with the increase of the pre-splitting degree. The P_○u of the T-beam strengthened by three-layer CFRP increases 52.8% than that strengthened by one-layer CFRP. When the pre-splitting degree is 60%， the f_○max reduces about 10%.