預(yù)應(yīng)力CFRP布及預(yù)緊螺栓加固RC梁試驗(yàn)研究
[Abstract]:In order to improve the effect and reliability of RC structure strengthened with CFRP, a new technique of prestressed CFRP and prestressing bolt is proposed. Combined with the damage characteristics of in-service RC beams and the present reinforcement methods of RC beams, the flexural behavior of intact and damaged RC beams was studied by using different CFRP reinforcement techniques. In view of the defects of the present carbon fiber tensioning equipment, a new type of carbon fiber cloth tensioning equipment is developed, which is convenient for field application, and the influence of the prestressing force on the reinforcement effect is analyzed. The results show that the combination of prestressed carbon fiber cloth and pre-tightening bolt is a more reliable method for bridge strengthening, which can not only improve the flexural bearing capacity of RC beam section and the stiffness of RC beam in normal service stage. Moreover, bolt pre-anchoring carbon fiber cloth can restrain its peeling on concrete surface, improve the bond strength between carbon fiber cloth and concrete surface, apply prestressing force to carbon fiber sheet can give full play to its high strength performance. Effectively suppress crack cracking and development of concrete.
【作者單位】: 山東大學(xué)土建與水利學(xué)院;濟(jì)南市公路管理局;
【基金】:山東省自然科學(xué)基金(ZR2013EEM025) 山東大學(xué)自主創(chuàng)新基金(2012ZD032)~~
【分類號】:TU378.1
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