配筋率对高速铁路圆端形实心桥墩地震响应影响研究

发布时间：2018-11-27 12:10

【摘要】：桥梁是高速铁路的重要组成部分,在桥梁结构用于抵御地震侧向力的体系中,桥墩起着关键作用。尽管我国在建设高速铁路方面已积累了很多的成功经验,但对低配筋高速铁路桥墩的抗震性能和设计方法等关键性问题仍缺乏系统的理论和试验研究。针对高速铁路桥墩抗震研究成果缺乏的现状,本文选取高速铁路桥梁中常见的圆端形实心桥墩作为研究对象,主要研究工作如下： (1)根据结构动力试验相似理论设计制作了高速铁路圆端型实心桥墩模型,进行单向和双向水平地震作用下的振动台试验,试验结果表明该桥墩抗震性能良好,截面刚度略有退化；单向水平地震作用下和双向水平地震作用下对应方向的墩顶加速度和位移响应最大值差别不大。 (2)利用大型通用有限元软件ABAQUS,选用合适的混凝土、钢筋本构关系,建立振动台试验圆端形实心桥墩的仿真模型,进行地震响应动力弹塑性时程分析,并将计算结果和试验结果进行对比分析,验证了有限元软件计算的可行性。 (3)考虑纵筋率和配箍率两个参数,设计一组(10个)圆端形实心桥墩模型,利用有限元软件ABAQUS进行双向水平地震作用下的动力弹塑性时程分析,深入分析纵筋率和配箍率对圆端形实心桥墩加速度响应、位移响应、墩底剪力、等效塑性应变、耗能、延性等的影响,并结合分析结果提出高速铁路圆端形实心桥墩合适的抗震设计参数建议。
[Abstract]:Bridge is an important part of high speed railway. Bridge pier plays a key role in the system of bridge structure used to resist seismic lateral force. Although China has accumulated a lot of successful experiences in the construction of high-speed railway, there is still a lack of systematic theoretical and experimental research on the seismic performance and design method of bridge piers of low-reinforced high-speed railway. In view of the lack of seismic research results of high speed railway pier, this paper selects round end solid pier in high-speed railway bridge as the research object. The main research works are as follows: (1) according to the similarity theory of structural dynamic test, the circular end solid pier model of high-speed railway is designed and made, and the shaking table test is carried out under unidirectional and bidirectional horizontal earthquake. The experimental results show that the pier has good seismic performance and the section stiffness is slightly degraded. Under unidirectional horizontal earthquake and bidirectional horizontal earthquake, the maximum values of acceleration and displacement response of piers in corresponding directions are not different. (2) by using the large-scale universal finite element software ABAQUS, to select suitable concrete and reinforcement constitutive relation, the simulation model of round end solid pier is established, and the dynamic elastoplastic time history analysis of seismic response is carried out. The results are compared with the experimental results, and the feasibility of finite element software is verified. (3) considering the two parameters of longitudinal reinforcement ratio and hoop ratio, a group of (10) round end shaped solid pier models are designed. The dynamic elastic-plastic time-history analysis is carried out by using the finite element software ABAQUS. The effects of longitudinal reinforcement ratio and hoop ratio on acceleration response, displacement response, shear force at pier bottom, equivalent plastic strain, energy dissipation, ductility, etc. Combined with the analysis results, the paper puts forward the appropriate seismic design parameters of round end shaped solid bridge pier in high speed railway.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U443.22

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