配筋率对公路桥梁墩柱延性抗震性能影响的研究

发布时间：2018-12-25 10:00

【摘要】：钢筋混凝土桥墩在地震荷载作用下极易发生破坏,作为桥梁重要承重构件,桥墩的安全与稳定关乎整个桥梁结构的安全正常使用。若结构主要承重构件破损严重且难以修复,即使结构还未倒塌,仍需拆除结构重建,从抗震防灾的方面考虑,钢筋混凝土桥墩应具有足够的承载力和较好的延性,保证结构安全并较好的消耗地震输入能量,避免在地震作用下发生破坏。桥墩延性影响因素众多,本文主要就配筋率对钢筋混凝土桥墩延性抗震性能影响进行相关数值模拟分析研究,主要内容及结论如下:(1)介绍了历史中桥墩破坏典型案例与桥墩抗震性能研究的发展概况,概述了延性抗震性能分析的主要方法与内容。根据美国太平洋地震研究中心钢筋混凝土柱抗震性能试验数据库(PEER-Structural Performance Database)低周反复荷载作用下钢筋混凝土柱的试验资料,分析了纵筋配筋率对钢筋混凝土柱延性性能的影响规律。(2)基于实际工程项目,设置纵筋率模拟参数,利用ABAQUS有限元分析软件进行低周反复模拟研究分析,通过改变纵筋配筋率后试件延性变化可知,位移延性系数随着配筋率的增加而减小,耗能能力也随之降低,而刚度呈增大趋势,根据本文分析确定试件性能较优配筋率范围为0.82%~3.28%。(3)通过分析不同纵筋率与配箍率相互作用下对圆柱式桥墩的延性影响可知,增大纵筋率将提高圆柱式桥墩的承载力,且配箍率越大,该提升效果越明显。纵筋布置形式对试件承载力、延性以及耗能影响效果不明显,但考虑施工便利应合理选用钢筋形式。
[Abstract]:Reinforced concrete pier is easy to be destroyed under earthquake load. As an important bearing member of bridge, the safety and stability of pier is related to the safe and normal use of the whole bridge structure. If the main bearing member of the structure is seriously damaged and difficult to repair, even if the structure has not collapsed, it is still necessary to remove and rebuild the structure. From the aspect of earthquake resistance and disaster prevention, the reinforced concrete pier should have sufficient bearing capacity and better ductility. To ensure the safety of the structure and good energy consumption earthquake input, to avoid damage under the earthquake. There are many factors affecting the ductility of bridge pier. This paper mainly studies the effect of reinforcement ratio on seismic behavior of reinforced concrete pier. The main contents and conclusions are as follows: (1) the typical cases of pier failure in history and the development of pier seismic performance research are introduced, and the main methods and contents of ductile seismic performance analysis are summarized. According to the experimental data of reinforced concrete columns under low cyclic loading (PEER-Structural Performance Database), the seismic behavior test database of reinforced concrete columns of Pacific Seismic Research Center of the United States of America is presented. The influence of reinforcement ratio of longitudinal reinforcement on ductility of reinforced concrete columns is analyzed. (2) based on the actual project, the simulation parameters of longitudinal reinforcement ratio are set up, and the low cycle repeated simulation analysis is carried out by using ABAQUS finite element analysis software. By changing the reinforcement ratio of longitudinal reinforcement, the ductility of the specimen can be seen that the displacement ductility coefficient decreases with the reinforcement ratio increasing, and the energy dissipation capacity decreases with the increase of reinforcement ratio, while the stiffness increases. According to the analysis in this paper, it is determined that the optimum reinforcement ratio of the specimen is 0.82and 3.28. (3) by analyzing the effect of the interaction of different longitudinal reinforcement ratio and hoop ratio on the ductility of cylindrical piers, Increasing the longitudinal reinforcement ratio will increase the bearing capacity of the cylindrical bridge pier, and the higher the hoop ratio is, the more obvious the lifting effect is. The effect of longitudinal reinforcement arrangement on the bearing capacity, ductility and energy consumption of the specimen is not obvious, but the form of steel bar should be selected reasonably considering the convenience of construction.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55

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