桥墩钢骨混凝土塑性铰抗震延性性能分析

发布时间：2018-05-19 22:21

本文选题：桥墩 + 抗震延性　；参考：《华北电力大学》2014年硕士论文

【摘要】：桥墩在抗震工程应用中允许在强烈地震作用下桥墩的特定部位出现塑性铰，通过塑性铰的耗能来抵抗地震作用。普通钢筋混凝土桥墩塑性铰通常难于提供所需的位移延性，本文探讨钢筋混凝土高架桥桥墩采用在潜在塑性铰区域内设置钢骨提高抗震延性从而提高其安全性能，本文的工作如下： 1.依据箍筋约束混凝土和钢骨内核心混凝土的本构模型和条件，以常见的墩柱截面形式为例，计算了矩形、圆形和矩形带圆端形钢骨混凝土截面的轴力和弯矩，编程绘制了常见截面的弯矩-曲率关系曲线，并证明了在塑性铰区配置钢骨可以有效提高截面的延性。 2.对影响延性的各参数进行分析，通过算例说明了各种参数对配圆钢管的钢骨混凝土曲线形式的影响，即各参数的的改变可以使配圆钢管的钢骨混凝土曲线表现出不同的形式；分析了各延性系数随参数的变化规律，，给出了钢骨混凝土设计中各种影响参数的范围。 3.对桥墩实例进行了矩形桥墩塑性铰区进行抗震性能分析。采用ANSYS有限元软件建立描述材料特性的有限元模型，模拟墩柱在大震作用下的抗震性能；采用工业工程的分析方法得到塑性铰区有钢骨模型的位移延性系数和极限位移大于无钢骨模型的，说明配置钢骨可以提高塑性铰抗震延性性能。
[Abstract]:In the application of seismic engineering, the piers are allowed to appear plastic hinge in the specific part of the pier under the strong earthquake, and the energy dissipation of the plastic hinge is used to resist the earthquake action. The plastic hinge of common reinforced concrete pier is usually difficult to provide the required displacement ductility. This paper discusses how to improve the seismic ductility of reinforced concrete viaduct pier by setting steel frame in the region of potential plastic hinge to improve its safety performance. The work of this paper is as follows: 1. Based on the constitutive model and conditions of confined concrete with stirrups and core concrete in steel bone, the axial forces and bending moments of rectangular, circular and rectangular circular end reinforced concrete sections are calculated by taking common section form of pier column as an example. The bending moment curvature curve of the common section is programmed and it is proved that the ductility of the section can be improved effectively by the placement of steel in the plastic hinge region. 2. The influence of the parameters on ductility is analyzed, and the influence of various parameters on the form of steel reinforced concrete curve of circular steel pipe is illustrated by an example, that is, the change of each parameter can make the steel reinforced concrete curve of circular steel pipe show different forms. The variation law of ductility coefficient with parameters is analyzed, and the range of influence parameters in steel reinforced concrete design is given. 3. The seismic behavior of plastic hinge region of rectangular pier is analyzed. ANSYS finite element software is used to establish the finite element model to describe the material characteristics and to simulate the seismic behavior of the pier column under the action of large earthquake. The ductility coefficient and limit displacement of the plastic hinged steel model are obtained by using the analysis method of industrial engineering. It is shown that the ductility of the plastic hinge can be improved by the placement of steel bone.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U443.22

【参考文献】