本文選題：帶懸臂梁段拼接的梁柱連接 + 高強螺栓�。� 參考：《華南理工大學(xué)》2013年碩士論文

【摘要】：帶懸臂梁段拼接的梁柱連接形式是目前在我國多高層鋼結(jié)構(gòu)工程中使用較為廣泛的一種連接形式。該節(jié)點形式在鋼結(jié)構(gòu)加工車間里完成懸臂梁段和柱構(gòu)件的焊接連接工作，而拼接梁段與懸臂梁段之間的連接采用高強螺栓全拼接形式，此部分在工地現(xiàn)場完成。該連接形式克服了施工現(xiàn)場的焊接技術(shù)難以保證梁柱連接焊縫質(zhì)量的缺點，在某種程度上起到了提高施工速度、保證施工質(zhì)量的作用。但在實際工程的應(yīng)用過程中依然存在問題，主要集中在兩方面：1節(jié)點的初始本構(gòu)關(guān)系難以確定；2如何避免梁柱焊縫發(fā)生脆性破壞，提高整體的延性。 通常情況下，將梁柱之間的全焊縫連接視為剛性連接，假定其在受力過程中具有充分的強度，同時能夠保證梁柱間夾角不變。但是大量的實踐和研究已經(jīng)證明這種假定不成立。全焊縫梁柱連接屬于半剛性連接，我國頒布的《鋼結(jié)構(gòu)設(shè)計規(guī)范》里明確規(guī)定在進行內(nèi)力分析時，應(yīng)先確定所采用半剛性連接形式的彎矩-轉(zhuǎn)角特性曲線。更何況對于帶懸臂梁段拼接的梁柱連接形式，拼接區(qū)的力學(xué)性能可能會對梁柱連接處的力學(xué)性能產(chǎn)生影響。研究拼接區(qū)的主要設(shè)計參數(shù)對梁柱連接處的初始本構(gòu)關(guān)系的影響程度，比較帶懸臂梁段拼接的梁柱連接的初始本構(gòu)關(guān)系與普通全焊接梁柱連接的差別，是本文的任務(wù)之一。本文設(shè)計制作了2個帶懸臂梁段高強螺栓拼接的焊接H型鋼梁柱連接節(jié)點試件，進行邊柱彈性加載、中柱彈性加載和中柱低周反復(fù)加載試驗，分析試驗現(xiàn)象和破壞機理，計算初始剛度。隨后運用有限元數(shù)值模擬分析，與試驗結(jié)果進行比較，同時定量分析與普通全焊縫梁柱連接節(jié)點形式之間的差別，研究帶懸臂梁段拼接的梁柱連接節(jié)點初始本構(gòu)關(guān)系的確定方法。 另一方面，上個世紀(jì)90年代的美國北嶺地震和日本阪神地震中，全焊縫梁柱連接發(fā)生了大量的脆性破壞，此后大量的研究圍繞著如何提高梁柱全焊縫連接節(jié)點的延性而展開。研究表明，即使采用更加嚴(yán)格、精細(xì)的焊接工藝技術(shù)，保證焊縫質(zhì)量也不足以提高其延性。在塑性受力階段，依靠焊縫來承受外力，或者說利用焊縫來耗散能量是行不通的。必須對節(jié)點形式加以改造，迫使塑性鉸從梁柱連接處往外移。為此有學(xué)者提出了削弱型節(jié)點和增強型節(jié)點的概念。帶懸臂梁段拼接的梁柱連接形式在梁上存在剛度突變，另外在彈塑性受力階段，螺栓與拼接板之間、螺桿與孔壁之間會發(fā)生滑移，翼緣拼接連接板會發(fā)生屈曲，因此可以通過對拼接區(qū)合理地設(shè)計，，使之在滿足承載力要求的前提下，使此類節(jié)點的塑性鉸在拼接區(qū)或其附近產(chǎn)生，可認(rèn)為是削弱型節(jié)點的一種。本文根據(jù)目前通用的拼接區(qū)設(shè)計方法，利用有限元數(shù)值建模對主要設(shè)計參數(shù)進行研究，探求各參數(shù)對節(jié)點初始剛度和延性的影響程度。最后針對于現(xiàn)有的拼接區(qū)設(shè)計方法，提出合理地設(shè)計建議。
[Abstract]:The Liang Zhu connection with cantilever beam section is widely used in the construction of multi-high-rise steel structures in China at present. The joints are welded to the cantilever beam section and column member in the steel structure processing workshop, and the connection between the cantilever beam segment and the cantilever beam section adopts the full splicing form of high strength bolt, which is completed in the site of the construction site. The joint form overcomes the shortcoming that the welding technology in the construction site is difficult to guarantee the quality of the Liang Zhu joint weld, and to some extent plays the role of improving the construction speed and ensuring the construction quality. However, there are still some problems in the application of practical engineering. It is difficult to determine how to avoid brittle failure of Liang Zhu weld and improve the ductility of the whole by focusing on two aspects of the initial constitutive relation of 1: 1 node. The full weld joint between Liang Zhu is regarded as a rigid connection, which is assumed to have sufficient strength in the process of loading, and the angle between Liang Zhu can be kept unchanged at the same time. But a great deal of practice and research have proved that this assumption is not true. The fully welded Liang Zhu connection is a semi-rigid connection. The Code for Design of Steel structures issued by China clearly stipulates that the bending moment-angle characteristic curve of the semi-rigid connection should be determined first when the internal force is analyzed. Moreover, for the Liang Zhu joints with cantilever beam segments, the mechanical properties of the splicing areas may affect the mechanical properties of the Liang Zhu joints. It is one of the tasks of this paper to study the influence of the main design parameters of the splicing zone on the initial constitutive relation of the Liang Zhu joint, and to compare the difference between the initial constitutive relation of the Liang Zhu connection with cantilever beam splicing and the ordinary fully welded Liang Zhu connection. In this paper, two specimens of welded H-beam Liang Zhu joints with cantilever beam segment high strength bolts are designed and fabricated. The tests of elastic loading of edge column, elastic loading of middle column and repeated low cycle loading of middle column are carried out, and the experimental phenomena and failure mechanism are analyzed. Calculate the initial stiffness. Then the finite element numerical simulation analysis is used to compare the results with the test results, and the difference between the joint form of Liang Zhu joint and that of general weld joint is analyzed quantitatively. In this paper, the method of determining the initial constitutive relationship of Liang Zhu joints with cantilever beam splicing is studied. On the other hand, during the North Ridge earthquake in the 1990s and the Hanshin earthquake in Japan, a large number of brittle failure occurred in the all-weld Liang Zhu connection. Since then, a lot of research has been carried out around how to improve the ductility of Liang Zhu full weld joint. The research shows that the quality of welding seam is not enough to improve its ductility even if more strict and fine welding technology is adopted. In the plastic stress stage, it is impossible to rely on the weld to bear the external force, or to dissipate energy by using the weld. The joint form must be modified to force the plastic hinge to move outward from the Liang Zhu joint. For this reason, some scholars put forward the concepts of weakened node and enhanced node. In addition, in the elastic-plastic stress stage, slippage will occur between bolt and spliced plate, between screw and hole wall, and buckling will occur between flange splice plate. Therefore, the plastic hinge of the joint can be produced in or near the joint area by reasonably designing the splicing zone and making it meet the requirements of bearing capacity, which can be considered as a kind of weakened joint. In this paper, the main design parameters are studied by using finite element numerical modeling according to the common design method of splicing area, and the influence of each parameter on the initial stiffness and ductility of joints is explored. Finally, according to the existing design method of splicing area, the reasonable design suggestion is put forward.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU973.13

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