预应力CFRP与钢板复合加固T梁抗弯性能试验

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

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Pu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Py与极限荷载Pu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Pu提高了52.8%.预裂程度为60%时,f_(max)降低约10%.

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 Pu 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 fmax and the ductility factor y is obvious in such a way that the/max reduces about 2 5%when the prestressing force increases 5%.The yield load Py and the ultimate load Pu increase linearly with the increase of the strengthening layers,and decrease linearly w ith the increase of the pre-splitting degree.The Pu 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 6 0%,the fmax reduces about 10%.