预应力BFRP布加固RC梁抗弯性能研究

发布时间：2018-03-08 21:30

本文选题：预应力BFRP布　切入点：效应　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：FRP加固技术因其质轻高强、不腐蚀、施工简便等优点得到广泛的应用。FRP中最常用的FRP为CFRP,但是其价格相对较高。BFRP不但在力学性能上与CFRP相媲美,且价格低廉、延性高于CFRP。然而目前对BFRP加固性能的研究相对CFRP、GFRP等要少的多。因此本文并开展了预应力BFRP布加固RC梁的抗弯性能试验研究、理论分析及数值模拟,主要研究内容如下:(1)结合在役钢筋混凝土桥梁均带裂缝工作的特点,本文对完好梁进行预裂,再采用BFRP布进行加固。通过4根试验梁的抗弯试验,对比分析试验梁的屈服荷载、极限荷载、变形性能及裂缝扩展状况等。研究预应力纤维布加固梁及未加固梁的抗弯性能,重点分析了不同的预应力水平对构件抗弯性能的影响。(2)开展了预应力BFRP布预应力损失试验研究,明确了纤维布张拉控制应力的合理取值区间。基于预应力BFRP布加固RC梁的正截面计算模型,对试验梁进行全过程受力分析,研讨了消压荷载、屈服荷载及正截面抗弯承载力的计算方法。(3)采用ANSYS对预应力BFRP布加固RC梁进行了有限元分析,对试验梁进行数值模拟,并将仿真值与试验值进行对比,验证了有限元模型的合理性。本文系统地研究BFRP的最优比和BFRP布加固RC梁的抗弯性能,其研究成果可为桥梁结构加固设计的加固设计提供科学参考。
[Abstract]:FRP reinforcement technology has been widely used in FRP because of its advantages of light weight, high strength, non-corrosion and easy construction. However, its price is relatively high, and its price is not only comparable to that of CFRP, but also low in price. The ductility of RC beams is higher than that of CFRP. However, the research on the strengthening performance of BFRP is much less than that of CFRP and so on. Therefore, the experimental study, theoretical analysis and numerical simulation of the flexural behavior of RC beams strengthened with prestressed BFRP sheets are carried out in this paper. The main research contents are as follows: (1) combined with the characteristics of existing reinforced concrete bridges with cracks, the intact beams are precracked and strengthened with BFRP cloth. The yield loads of the test beams are compared and analyzed through the flexural tests of four test beams. Ultimate load, deformation performance and crack propagation. The flexural behavior of prestressed fiber cloth reinforced and unstrengthened beams is studied. The influence of different prestressing levels on the flexural behavior of members is analyzed. (2) the experimental study on the prestressing loss of prestressed BFRP cloth is carried out. Based on the normal section calculation model of RC beam strengthened by prestressed BFRP cloth, the stress analysis of the test beam during the whole process is carried out, and the compressive load is discussed. The calculation method of yield load and flexural bearing capacity of normal section. (3) the finite element analysis of RC beam strengthened with prestressed BFRP cloth is carried out by ANSYS, and the numerical simulation of the test beam is carried out, and the simulation value is compared with the experimental value. The rationality of the finite element model is verified. The optimal ratio of BFRP and the flexural behavior of RC beams strengthened with BFRP cloth are systematically studied in this paper. The research results can provide a scientific reference for the reinforcement design of bridge structures.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.72

【共引文献】