本文關鍵詞： 高強度鋼材 焊接圓鋼管 殘余應力 軸心受壓 整體穩(wěn)定 設計方法　出處：《北京交通大學》2013年碩士論文　論文類型：學位論文

【摘要】：隨著冶金工藝和鋼結(jié)構(gòu)加工制造技術(shù)的不斷提高,高強度鋼材鋼結(jié)構(gòu)的工程實踐日益增多,世界各地已有很多大型建筑和橋梁結(jié)構(gòu)采用了高強度鋼材。高強度鋼材焊接圓鋼管主要應用在桁架、網(wǎng)架、網(wǎng)殼以及輸電鐵塔等結(jié)構(gòu)形式中,能夠充分發(fā)揮圓鋼管的受力性能優(yōu)勢。有關高強度焊接圓鋼管受力性能的研究尚處于起步階段,尤其缺乏高強度焊接圓鋼管軸心受壓構(gòu)件的殘余應力分布、整體穩(wěn)定性能等方面的研究成果,無法保證相關工程設計的合理性和可靠性。 本文介紹了高強度鋼材焊接圓鋼管的工程應用及其軸壓構(gòu)件穩(wěn)定性能的研究現(xiàn)狀,并總結(jié)了國內(nèi)外規(guī)范關于此類構(gòu)件的軸心受壓穩(wěn)定設計方法。為全面研究高強度焊接圓鋼管軸壓構(gòu)件的整體穩(wěn)定受力性能,本文首先針對9個焊接圓鋼管試件(包括6種截面尺寸、2種鋼材強度、2種焊接方式以及2種表面處理方式)進行了殘余應力試驗研究,得到了不同焊接圓鋼管試件沿全截面分布的縱向殘余應力數(shù)值大小,并基于大量的測量原始數(shù)據(jù),提出了焊接圓鋼管截面殘余應力的分布模型及計算公式,為構(gòu)件整體穩(wěn)定性能的研究提供依據(jù)；其次,針對24個Q420高強度鋼材埋弧焊接圓鋼管柱進行了軸心受壓試驗研究,基于試驗結(jié)果分析了其失穩(wěn)變形特征,比較了試件整體穩(wěn)定系數(shù)試驗值與國內(nèi)外規(guī)范柱子曲線計算值的關系；再次,本文運用通用有限元軟件ANSYS建立了能夠考慮幾何初始缺陷及截面殘余應力影響的三維有限元模型,對所有試件的整體穩(wěn)定受力性能進行了有限元分析,并通過與試驗結(jié)果的對比,驗證了有限元模型的準確性和可靠性；最后,采用驗證后的有限元模型計算了480個高強度焊接圓鋼管軸壓構(gòu)件的整體穩(wěn)定系數(shù),并通過與國內(nèi)外規(guī)范柱子曲線計算值的對比,建議了不同等級高強度鋼材焊接圓鋼管軸壓構(gòu)件柱子曲線類別的選取,同時分別提出了不同強度等級鋼材焊接圓鋼管軸心受壓構(gòu)件整體穩(wěn)定性能的設計方法,并在此基礎上最終提出了一條適用于高強度鋼材焊接圓鋼管的柱子曲線。
[Abstract]:With the continuous improvement of metallurgical technology and manufacturing technology of steel structure, the engineering practice of high strength steel structure is increasing day by day. Many large buildings and bridge structures around the world have adopted high strength steel. High strength steel welded circular steel pipes are mainly used in trusses, grid frames, grid shells and transmission towers. The research on the mechanical behavior of high strength welded circular steel pipe is still in its infancy, especially in the absence of residual stress distribution of the axial compression member of high strength welded circular steel pipe. The research results of overall stability performance can not guarantee the rationality and reliability of related engineering design. This paper introduces the engineering application of high strength steel welded circular steel pipe and the research status of the stability of axial compression members. The design methods of axial compression stability of this kind of members are summarized in the domestic and foreign codes. In order to study the overall stability behavior of high strength welded circular steel tube under axial compression, In this paper, the residual stress of 9 welded circular steel tube specimens (including 6 kinds of section sizes, 2 kinds of steel strength welding methods and 2 kinds of surface treatment methods) has been studied. The longitudinal residual stress values of different welded circular steel tube specimens distributed along the full section are obtained. Based on a large number of measurement data, the distribution model and calculation formula of residual stress in welded circular steel tube section are proposed. Secondly, the axial compression tests of 24 Q420 high strength steel submerged arc welded circular steel pipe columns are carried out, and the characteristics of instability deformation are analyzed based on the test results. The relationship between the test value of the whole stability coefficient of the specimen and the calculated value of the column curve of the code at home and abroad is compared. Thirdly, a three-dimensional finite element model which can take into account the influence of the initial geometric defect and the residual stress of the section is established by using the universal finite element software ANSYS. Finite element analysis is carried out on the whole stability of all the specimens, and the accuracy and reliability of the finite element model are verified by comparing with the experimental results. The overall stability factors of 480 high strength welded circular steel tube members under axial compression are calculated by using the verified finite element model, and the calculated values are compared with the calculated values of the column curves of the codes at home and abroad. The selection of column type of axial compression member of welded circular steel tube with different grades of high strength steel is suggested. At the same time, the design method of overall stability of axial compression member of welded circular steel tube with different strength grade is put forward. Finally, a column curve suitable for high strength steel welded circular steel pipe is proposed.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU392.3

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