钢丝网钢筋砂浆加固混凝土梁的性能-结构工程专业论文.docxVIP

汕头大学硕士学位论文 V Abstract In order to develop a better method for concrete-strengthening, an idea of wire mesh/steel bar (large diameter) mortar (WM/SBM)-strengthening for RC beams was proposed. 12 beams were made and a three-stage comparatively experimental study was carried out. 4 beams were used for the first stage study. The flexural behaviors of the RC beam strengthened with wire mesh mortar and the RC beam strengthened with WM/SBM were compared through an experimental study. Primary investigations on the suitable ratio between wire mesh and steel bar and the factors influencing construction quality were performed as well. The research results showed that the WM/SBM strengthening not only has the advantages similar to that of the wire mesh mortar strengthening, but also may lead to a much higher load bearing capacity. However, this research also showed that too many layers of wire mesh may result in a difficult and poor construction. In the light of the first stage research, an idea of strengthening RC beam with wire mesh (small quantity)/steel bar mortar was proposed. 4 beams strengthened with wire mesh (small quantity)/steel bar mortar and 1 comparative beam were taken for the second stage research on the flexural behaviors. The test results showed that the wire mesh(small quantity)/steel bar mortar-strengthening not only may keep the advantages similar to that of the wire mesh mortar strengthening, but also may lead to a much higher load bearing capacity under an area ratio of 0.07 between wire mesh and steel bar. To make our research close to practice, another two beams strengthened with wire mesh (small quantity)/steel bar mortar were used for the third stage of the experimental study. Secondary loading was performed on the 2 beams. The research results were compared with those obtained in the second stage study. The test results showed that the cracking loads of the secondary-load beams were obviously lower than those of beams without secondary loading. T