ABSTRACT

This paper presents an experimental study on the flexural behavior of reinforced concrete (RC) beams strengthened with prestressed steel wire ropes-polymer mortar composite (PSWR-PM). The effects of reinforcement ratio of steel wire ropes, strengthening procedures, and unbonded length of the steel wire rope-to-polymer mortar interface were studied with large-scale bending tests on RC beams strengthened by PSWR-PM. The test results showed that the proposed strengthening technique could substantially increase the load carrying capacity of the RC beams. Both strengthening procedures were effective in enhancing the flexural behaviour of the RC beams, and strengthening procedure II could even restrain the debonding failure. The unbonded length of the steel wire rope-to-polymer mortar interface had a minor impact on the ultimate capacity when the anchoring length of the steel wire rope in the polymer mortar was sufficient. Moreover, a theoretical model was proposed to predict the flexural strength of RC beams strengthened with the PSWR-PM technique and the predictions showed good agreement with the experimental results.

摘要

本文介绍了预应力钢丝绳-聚合物砂浆复合材料 (PSWR-PM) 加固的钢筋混凝土 (RC) 梁的抗弯性能试验研究。通过对 PSWR-PM 加固 RC 梁进行大尺寸弯曲试验，研究了钢丝绳配筋率、加固程序和钢丝绳与聚合物砂浆界面未粘结长度的影响。试验结果表明，所提出的加固技术可以显着提高钢筋混凝土梁的承载能力。两种加固程序都有效地增强了 RC 梁的弯曲性能，加固程序 II 甚至可以抑制脱粘破坏。当钢丝绳在聚合物砂浆中的锚固长度足够时，钢丝绳与聚合物砂浆界面的未粘合长度对极限承载力的影响较小。此外，提出了一个理论模型来预测使用 PSWR-PM 技术加固的 RC 梁的抗弯强度，并且预测结果与实验结果具有很好的一致性。