發(fā)布時(shí)間：2018-05-01 10:20

  本文選題：中空夾層鋼管混凝土 + 側(cè)向撞擊��； 參考：《太原理工大學(xué)》2014年碩士論文

【摘要】：圓套圓中空夾層鋼管混凝土(Concrete Filled Double Skins Steel Tube,簡(jiǎn)稱CFDST)是在鋼管混凝土的基礎(chǔ)上提出的一種新型鋼-混凝土組合結(jié)構(gòu)。因其具有截面開展、抗彎剛度大等使用優(yōu)點(diǎn),越來(lái)越多地被應(yīng)用作橋墩、海洋平臺(tái)、高層建筑等結(jié)構(gòu)的豎向承重構(gòu)件。而這些結(jié)構(gòu)在使用過(guò)程中不可避免地會(huì)遭受到車輛、船舶等的撞擊,對(duì)人們的生命財(cái)產(chǎn)安全造成嚴(yán)重威脅。 目前對(duì)CFDST的研究主要集中于靜力性能,如軸壓、純彎、壓彎等性能；對(duì)于橋墩的耐撞性研究主要集中在通過(guò)試驗(yàn)等手段建立撞擊力的計(jì)算理論,以及通過(guò)設(shè)置防撞裝置來(lái)避免橋墩的破壞。本文將對(duì)CFDST這種新型結(jié)構(gòu)在橋墩上的應(yīng)用展開研究,從橋墩自身的承載能力分析中空夾層鋼管混凝土橋墩的耐撞性。本文主要展開的工作有： 1)在太原理工大學(xué)DHR9401型落錘試驗(yàn)機(jī)上進(jìn)行圓套圓中空夾層鋼管混凝土構(gòu)件的側(cè)向沖擊試驗(yàn)。觀察試驗(yàn)過(guò)程中試件的整體和局部變形,并記錄了試件的沖擊力(F)、應(yīng)變(￡)、撓度(△)時(shí)程曲線。 2)利用ABAQUS有限元模型對(duì)試驗(yàn)過(guò)程進(jìn)行模擬計(jì)算,將模擬計(jì)算的結(jié)果與試驗(yàn)結(jié)果進(jìn)行對(duì)比分析,驗(yàn)證了有限元模型的有效性。在此基礎(chǔ)上分析了撞擊的全過(guò)程,并展開相關(guān)的參數(shù)分析,重點(diǎn)研究了空心率(x)對(duì)中空夾層鋼管混凝土構(gòu)件動(dòng)力響應(yīng)的影響。 3)結(jié)合工程中橋墩的應(yīng)用案例,采用ABAQUS有限元軟件建立車輛撞擊橋墩的模型對(duì)橋墩的耐撞性展開分析。通過(guò)賦予車輛不同的質(zhì)量和速度設(shè)計(jì)9種典型的撞擊工況,根據(jù)模擬結(jié)果中對(duì)橋墩破壞情況及性能的分析,重點(diǎn)討論了撞擊過(guò)程中,車輛產(chǎn)生的撞擊力(Demand)和橋墩自身的承載力(Capability)。 本文提出的研究方法和結(jié)論可為考慮側(cè)向撞擊工況的橋墩等中空夾層鋼管混凝土結(jié)構(gòu)的設(shè)計(jì)提供參考。
[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.

【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U443.22

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