增大截面法加固一字型剪力墙抗震性能试验研究

发布时间：2018-09-17 20:33

【摘要】：增大截面加固法是加固钢筋混凝土结构常用而有效的方法,大量运用于剪力墙结构加固工程中,通常有单面增大截面和双面增大截面两种方式。由于两种加固方法的传力途径、受力特点不同,加固剪力墙的抗震性能会受到相应的影响,但是两者在破坏形态、滞回特性、承载力、延性、刚度及耗能能力等方面存在的具体差异尚不清楚。因此研究单、双面增大截面法加固剪力墙的抗震性能,探究两者的加固效果,将完善我国剪力墙抗震加固领域的研究内容。本文根据现有的相关研究成果与规范,设计制作了未加固剪力墙、单面增大截面加固剪力墙与双面增大截面加固剪力墙3片一字型剪力墙试件,各试件的轴压比、剪跨比、配筋率均相同,通过拟静力试验对三者的抗震性能进行了研究,对比分析了单、双面增大截面加固剪力墙试件的加固效果。试验结果表明:(1)增大截面法加固一字型剪力墙试件的滞回特性、承载能力、延性、刚度及耗能能力与未加固一字型剪力墙试件相比均有一定幅度的提升,抗震性能得到明显改善,加固效果良好,单、双面增大截面加固法均能有效运用在剪力墙抗震加固工程中;(2)双面与单面增大截面加固一字型剪力墙试件的抗震性能存在一定的区别,具体比值如下:初始刚度基本相等,极限承载力比值为1.26,破坏荷载比值为1.21,峰值点位移比为1.04,极限位移比值为1.01,位移延性系数比值为1.05,等效粘滞阻尼系数比值为1.09,可见双面增大截面加固法对一字型剪力墙的抗震加固效果优于单面增大截面加固法。在试验研究的基础上,采用有限元分析软件ABAQUS对建立的3片剪力墙模型进行了低周反复加载全过程的数值模拟,得到了墙体的破坏形态、应力分布、滞回曲线与极限承载力,将所得结果与试验结果进行对比分析,验证了单、双面增大截面加固法的加固效果和有限元模拟的可靠性。在此基础上,对加固截面厚度不同的3片单面增大截面加固一字型剪力墙试件进行有限元拓展分析,研究了不同的加固截面厚度对单面增大截面加固一字型剪力墙抗震性能的影响规律。研究结果表明:(1)模拟结果的破坏形态特征与试验相符,极限承载力误差均在10%以内,有限元分析结果与试验结果基本吻合,验证了本文所建立的有限元模型与分析过程是合理可靠的,具有较高的准确性。(2)随着加固截面厚度的增大,单面增大截面加固一字型剪力墙试件的承载能力与延性整体上呈现不断上升的发展趋势,增长幅度逐渐降低。且加固截面厚度为85mm的单面增大截面加固一字型剪力墙试件的抗震加固效果与加固截面厚度为70mm的双面加固试件基本接近。综上所述,增大截面加固法能够显著提高一字型剪力墙的抗震性能,是适用于剪力墙抗震加固的有效方法,而双面增大截面加固法的抗震加固效果优于单面增大截面加固法,可以通过增大加固截面厚度的方式使单面增大截面加固一字型剪力墙的抗震性能达到同样的效果。本文对于增大截面法加固一字型剪力墙抗震性能的初步研究,将为实际剪力墙结构的合理加固提供参考,并为进一步探究增大截面法加固剪力墙的抗震性能,优化剪力墙增大截面的加固方式奠定理论基础,具有重要的研究价值。
[Abstract]:Increased cross-section reinforcement is a common and effective method to reinforce reinforced concrete structures. It is widely used in shear wall structures. There are usually two ways to increase the cross-section on one side and double sides. However, the specific differences between the two methods in failure mode, hysteretic behavior, bearing capacity, ductility, stiffness and energy dissipation capacity are still unclear. Therefore, the study on the seismic performance of shear walls strengthened by single-side and double-side enlarged cross-section method, and the study on the reinforcement effect of the two methods will improve the research content in the field of seismic strengthening of shear walls in China. Relevant research results and codes have been designed and manufactured. Three one-piece shear wall specimens are designed and manufactured. The axial compression ratio, shear span ratio and reinforcement ratio of each specimen are the same. The results show that: (1) The hysteretic behavior, bearing capacity, ductility, stiffness and energy dissipation capacity of the shear wall strengthened by enlarging section method are improved to a certain extent compared with those of the shear wall strengthened by non-strengthening section method. Double-sided enlarged cross-section reinforcement method can be effectively used in shear wall seismic reinforcement engineering; (2) There are some differences between double-sided and single-sided enlarged cross-section reinforcement of a zigzag shear wall specimen seismic performance, the specific ratio is as follows: the initial stiffness is basically equal, the ultimate bearing capacity ratio is 1.26, the failure load ratio is 1.21, the peak displacement ratio is 1.0. 4. The ultimate displacement ratio is 1.01, the displacement ductility ratio is 1.05, and the equivalent viscous damping ratio is 1.09. It can be seen that the seismic strengthening effect of double-sided enlarged section reinforcement method is better than that of single-sided enlarged section reinforcement method. The failure modes, stress distributions, hysteretic curves and ultimate bearing capacity of the wall are obtained by numerical simulation of the whole process of cyclic loading. The results are compared with the experimental results, which verify the reinforcement effect and the reliability of finite element simulation of the single-side and double-side enlarged section reinforcement method. Three specimens of one-way shear wall strengthened with one-way enlarged cross-section are analyzed by finite element method, and the influence of different thickness of strengthened cross-section on the seismic performance of one-way enlarged cross-section shear wall is studied. The results of finite element analysis are in good agreement with the test results, which proves that the finite element model and analysis process established in this paper are reasonable and reliable, and have high accuracy. (2) With the increase of the thickness of the reinforced section, the bearing capacity and ductility of the strengthened shear wall specimens with one-sided section increase gradually. In conclusion, the method of enlarging the cross-section can significantly improve the seismic performance of the I-shaped shear wall and is suitable for shear. The seismic strengthening effect of double-side enlarged section reinforcement method is better than that of single-side enlarged section reinforcement method. The seismic performance of single-side enlarged section reinforced I-shaped shear wall can achieve the same effect by increasing the thickness of reinforcement section. The preliminary study on seismic performance will provide reference for the reasonable reinforcement of shear wall structure, and lay a theoretical foundation for further study on the seismic performance of shear wall strengthened by enlarged section method, and optimize the reinforcement method of shear wall enlarged section, which has important research value.
【学位授予单位】：西南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.2;TU352.11

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