CFRP加固震损型钢混凝土短肢剪力墙抗震性能试验研究

发布时间：2018-05-29 13:32

本文选题：型钢混凝土短肢剪力墙 + 碳纤维布　；参考：《广西大学》2017年硕士论文

【摘要】：本文设计修复了 5个1/2缩尺的型钢混凝土短肢剪力墙试件,采用低周往复加载的方法对它们的抗震性能进行了科学系统的分析。5个试件具有相同的配筋形式和轴压比,以有无斜撑、屈曲钢筋是否修补和CFRP布加固方案作为变化因子。通过观察试件的破坏模式,记录CFRP布的剥离破坏情况,同时测量了各试件的荷载-位移曲线,由此对修复试件的承载能力及承载力退化、刚度退化、变形能力、耗能性能、变形特征等进行了对比分析,并将基于两种承载力计算模型的计算结果与试验结果进行对比分析,得到主要结论如下:(1)5个修复试件受力过程都经历了相似的四个阶段,即弹性阶段、CFRP剥离阶段、屈服阶段和破坏阶段。各试件均是以弯曲变形为主的弯剪破坏。(2)修复试件时,替换试件根部屈曲钢筋不会显著影响试件的极限荷载,但可以明显提高试件的屈服荷载与初始刚度,改善试件的延性和耗能性能。(3)修复试件中的钢筋斜撑可以显著提高试件的屈服荷载,明显改善试件的极限承载力、延性和耗能性能,减缓试件的强度与刚度退化。(4)两种CFRP布加固方案均能有效恢复试件的承载力、刚度、延性和耗能性能,改善试件的强度及刚度退化。(5)A方案的加固效果优于B方案。采用A方案加固的试件,其承载力可恢复至原值的90%以上,强度与刚度退化也明显好于原试件,修复试件的后期刚度甚至高于原试件,表明X形CFRP布可在一定程度上代替钢筋斜撑。(6)两种加固方案中,水平CFRP压条均能有效限制试件表面CFRP布的剥离。(7)采用基于能量法和拉压杆模型的两种承载力计算方法所得承载力值与实测值的偏差均较小,故该两种方法均适用于CFRP加固震损型钢混凝土短肢剪力墙试件的理论承载力计算。
[Abstract]:In this paper, 5 steel reinforced concrete short leg shear wall specimens with 1 / 2 scale have been designed and repaired, and their seismic performance has been analyzed scientifically and systematically by the method of low cycle reciprocating loading. The five specimens have the same reinforcement form and axial compression ratio. With or without diagonal brace, whether the buckling reinforcement repair and CFRP reinforcement as a change factor. By observing the failure mode of the specimen, the peeling failure of the CFRP cloth was recorded, and the load-displacement curve of each specimen was measured, which resulted in the degradation of the bearing capacity and bearing capacity of the repaired specimen, the degradation of stiffness, the deformability of deformation, and the energy dissipation performance. The deformation characteristics are compared and analyzed, and the calculated results based on the two kinds of bearing capacity calculation models are compared with the experimental results. The main conclusions are as follows: 1) the stress process of the five repaired specimens has undergone similar four stages. They are elastic stage, yield stage and failure stage. When each specimen is repaired by bending shear failure, the ultimate load of the specimen will not be significantly affected by the replacement of the buckling bar at the root of the specimen, but the yield load and initial stiffness of the specimen can be improved obviously. Improving the ductility and energy dissipation performance of the specimen. 3) repairing the inclined bracing of the steel bar in the specimen can significantly increase the yield load of the specimen, and obviously improve the ultimate bearing capacity, ductility and energy dissipation performance of the specimen. Both CFRP reinforcement schemes can effectively restore the bearing capacity, stiffness, ductility and energy dissipation performance of the specimens, and improve the strength and stiffness degradation of the specimens. The reinforcement effect of the scheme is better than that of the B scheme. The strength and stiffness of the specimens strengthened with the A scheme can be restored to more than 90% of the original value, and the strength and stiffness degradation of the specimens is obviously better than that of the original specimens, and the later stiffness of the repaired specimens is even higher than that of the original specimens. It shows that X-shaped CFRP cloth can be used to replace oblique brace of steel bar to some extent. Horizontal CFRP strip can effectively limit the exfoliation of CFRP cloth on the surface of the specimen.) the deviation between the bearing capacity value and the measured value is small by using the two calculation methods based on energy method and tension and compression bar model. Therefore, the two methods can be used to calculate the theoretical bearing capacity of the specimens strengthened with CFRP.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.2;TU352.11

【参考文献】