基于能量分析的RC矩形空心桥墩抗震性能研究

发布时间：2019-03-14 18:08

【摘要】：近年来,随着经济的发展,我国有许多新建和拟建的桥梁,这些桥梁大多为高墩大跨桥梁,且多采用钢筋混凝土(RC)空心桥墩,而矩形空心桥墩是桥墩截面类型中较常用的一种,因此迫切地需要对RC矩形空心桥墩的抗震性能进行研究。能量作为评价结构抗震性能的一种指标,其优点在于能较好的反映整个地震作用的全过程,结构在地震作用过程中的弹塑性性能也得以体现。能量分析方法,能从本质上体现地震作用的整个过程是能量的传递、转化与消耗的过程。通过能量分析方法研究各参数对桥墩抗震性能的影响,对于桥梁结构抗震设计具有重要参考意义。为了研究RC矩形空心桥墩的抗震性能,本文基于空心桥墩的振动台试验,采用数值模拟方法对不同特性参数的RC矩形空心桥墩进行数值分析,基于能量的分析方法,研究桥墩各设计参数对矩形空心桥墩抗震性能的影响。主要工作如下:(1)建立较为合理的矩形空心桥墩模型,针对不同特性参数(剪跨比、轴压比、配筋率和配箍率),采用控制变量法建立不同的模型。选取合理的数值模拟单元、材料本构模型、截面划分方法等,力求分析结果与实际工程情况相一致。(2)选取合适的地震波,对以上建立的模型进行非线性动力分析,将数值结果与已有试验结果进行对比,验证了本文所建模型的正确性。(3)通过非线性分析得到各个工况下的桥墩模型的地震响应,并分析了不同特性参数(剪跨比、轴压比、配筋率和配箍率)对桥墩地震响应的影响。(4)基于能量分析方法,分析了桥墩设计参数(剪跨比、轴压比、配筋率和配箍率)对RC矩形空心桥墩抗震性能的影响。研究表明,RC矩形空心桥墩的抗震性能良好,基于能量的分析方法能较好的分析空心桥墩的抗震性能,且分析得出各桥墩设计参数对桥墩的抗震性能都会产生不同程度的影响。本文分析结果可供桥梁抗震设计作为参考。
[Abstract]:In recent years, with the development of economy, there are many new and planned bridges in China. Most of these bridges are high-pier and long-span bridges, and most of these bridges are reinforced concrete (RC) hollow piers. The rectangular hollow pier is one of the common types of pier section, so it is urgent to study the seismic performance of RC rectangular hollow pier. As an index to evaluate the seismic performance of structures, energy has the advantage of better reflecting the whole process of earthquake action, and the elasto-plastic performance of structures in the course of earthquake action can also be reflected. The energy analysis method can essentially reflect that the whole process of earthquake action is the process of energy transfer, transformation and consumption. It is of great significance for seismic design of bridge structure to study the influence of various parameters on seismic performance of bridge piers by energy analysis method. In order to study the seismic performance of RC rectangular hollow piers, based on the shaking table test of hollow piers, the numerical simulation method of RC rectangular hollow piers with different characteristic parameters is presented in this paper, which is based on the energy analysis method. The influence of design parameters of pier on seismic performance of rectangular hollow pier is studied. The main work is as follows: (1) the reasonable rectangular hollow pier model is established. According to different characteristic parameters (shear-span ratio, axial compression ratio, reinforcement ratio and stirrups ratio), different models are established by using the control variable method. The reasonable numerical simulation element, material constitutive model and section partition method are selected to make the analysis results consistent with the actual engineering situation. (2) the nonlinear dynamic analysis of the above model is carried out by selecting the appropriate seismic wave. The numerical results are compared with the existing experimental results, and the correctness of the model is verified. (3) the seismic response of the pier model under various working conditions is obtained by nonlinear analysis, and the different characteristic parameters (shear-span ratio, shear-span ratio) are analyzed. The influence of axial compression ratio, reinforcement ratio and stirrup ratio on seismic response of RC rectangular hollow pier is analyzed. (4) based on the energy analysis method, the influence of pier design parameters (shear span ratio, axial compression ratio, reinforcement ratio and stirrups ratio) on seismic performance of hollow pier is analyzed. The research shows that the seismic performance of RC rectangular hollow pier is good, and the energy-based analysis method can better analyze the seismic performance of hollow pier, and the analysis results show that the design parameters of each pier will have different effects on the seismic performance of the pier. The results of this paper can be used as a reference for seismic design of bridges.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55

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