高强灌浆料加固既有RC梁抗弯性能分析

为研究高强灌浆料加固钢筋混凝土(RC)梁在不同设计参数下的抗弯性能,对5根高强灌浆料加固梁和2根对比梁进行试验研究和理论分析.测量梁的裂缝分布、挠度变形、应变发展及破坏形态.试验结果表明:采用高强灌浆料加固RC梁能有效提高RC梁的抗弯承载力、截面刚度;适当的植筋间距对新老混凝土间黏结性能有较好的影响,但采取不同的植筋间距对加固梁的抗弯性能影响不大;梁底加固厚度的增加也只能在有限范围内改善新老纵筋受力差异,对加固梁抗弯承载力提高并不明显;高强灌浆料加固梁的抗弯承载力计算公式计算的结果与试验结果吻合较好.

Flexural Performance Analysis of Existing RC Beams Strengthened Using High-Strength Grouting Material

In order to study the flexural performance of reinforced concrete(RC)beams strengthened using high-strength grouting material under different design parameters, the experimental research and theoretical analysis of five beams strengthened with high-strength grouting material and two contrast beams were carried out. The crack distribution, deflection, strain development and failure modes of beams were measured. The test results show that the high-strength grouting material can effectively improve the flexural capacity and section stiffness of the RC beams strengthened. Influence of appropriate planting bar spacing on the bonding performance between new and original concrete is significant, but different planting bars spacing has little effect on the flexural performance of the concrete beams strengthened. The increase in the strengthening thickness of the beam bottom can only improve the stress difference between the old and the new longitudinal bars within a certain range, the flexural bearing capacity of beams strengthened is improved little. The results of flexural capacity formula of the beam strengthened with high-strength grouting material agree well with the experimental ones.