圆套圆通中空夹层钢管混凝土桥墩的耐撞性研究

发布时间：2018-05-01 10:20

本文选题：中空夹层钢管混凝土 + 侧向撞击　；参考：《太原理工大学》2014年硕士论文

【摘要】：圆套圆中空夹层钢管混凝土(Concrete Filled Double Skins Steel Tube,简称CFDST)是在钢管混凝土的基础上提出的一种新型钢-混凝土组合结构。因其具有截面开展、抗弯刚度大等使用优点,越来越多地被应用作桥墩、海洋平台、高层建筑等结构的竖向承重构件。而这些结构在使用过程中不可避免地会遭受到车辆、船舶等的撞击,对人们的生命财产安全造成严重威胁。目前对CFDST的研究主要集中于静力性能,如轴压、纯弯、压弯等性能；对于桥墩的耐撞性研究主要集中在通过试验等手段建立撞击力的计算理论,以及通过设置防撞装置来避免桥墩的破坏。本文将对CFDST这种新型结构在桥墩上的应用展开研究,从桥墩自身的承载能力分析中空夹层钢管混凝土桥墩的耐撞性。本文主要展开的工作有： 1)在太原理工大学DHR9401型落锤试验机上进行圆套圆中空夹层钢管混凝土构件的侧向冲击试验。观察试验过程中试件的整体和局部变形,并记录了试件的冲击力(F)、应变(￡)、挠度(△)时程曲线。 2)利用ABAQUS有限元模型对试验过程进行模拟计算,将模拟计算的结果与试验结果进行对比分析,验证了有限元模型的有效性。在此基础上分析了撞击的全过程,并展开相关的参数分析,重点研究了空心率(x)对中空夹层钢管混凝土构件动力响应的影响。 3)结合工程中桥墩的应用案例,采用ABAQUS有限元软件建立车辆撞击桥墩的模型对桥墩的耐撞性展开分析。通过赋予车辆不同的质量和速度设计9种典型的撞击工况,根据模拟结果中对桥墩破坏情况及性能的分析,重点讨论了撞击过程中,车辆产生的撞击力(Demand)和桥墩自身的承载力(Capability)。本文提出的研究方法和结论可为考虑侧向撞击工况的桥墩等中空夹层钢管混凝土结构的设计提供参考。
[Abstract]:Concrete Filled Double Skins Steel Tube (CFDST) is a new type of steel concrete composite structure on the basis of concrete-filled steel tube, which has the advantages of cross section, bending stiffness and so on, and is more and more used as pier, offshore platform, high-rise building and so on. In the course of use, these structures inevitably suffer from the impact of vehicles, ships and so on, which poses a serious threat to the safety of people's life and property.
At present, the research on CFDST mainly focuses on the static performance, such as axial compression, pure bending, bending and so on. The research on the collision resistance of piers is mainly focused on the calculation theory of impact force by means of testing and the setting of collision avoidance devices to avoid the failure of the pier. This paper will show the application of the new structure of CFDST on the pier. In this paper, the crashworthiness of hollow concrete filled steel tubular (CFST) pier is analyzed from the bearing capacity of the pier.
1) the lateral impact test of circular hollow interlayer concrete filled steel tube is carried out on the DHR9401 type drop hammer test machine of Taiyuan University of Technology. The whole and local deformation of the specimen in the test process is observed, and the impact force (F), strain ($) and deflection (delta) time history curve of the specimen are recorded.
2) the ABAQUS finite element model is used to simulate the test process, and the results of the simulated calculation are compared with the test results, and the validity of the finite element model is verified. On this basis, the whole process of the impact is analyzed, and the related parameters are analyzed, and the hollow ratio (x) is focused on the dynamic behavior of the hollow sandwich steel tube concrete member. The effect of the force response.
3) combined with the application case of bridge pier in the project, the model of vehicle impact bridge pier is established by using ABAQUS finite element software to analyze the collision resistance of the pier. By giving different quality and speed of vehicles to design 9 typical impact conditions, according to the analysis of the failure and performance of the pier in the simulation results, the emphasis is made on the impact process. Vehicle impact force (Demand) and pier self carrying capacity (Capability).
The research methods and conclusions presented in this paper can provide a reference for the design of hollow concrete filled steel tubular (CFST) structures with lateral impact.

【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.22

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