本文關(guān)鍵詞： 直接焊接的鋼管結(jié)構(gòu) 墊板加強節(jié)點 K型搭接節(jié)點 有限元分析 滯回性能 試驗研究　出處：《寧夏大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：直接焊接的鋼管結(jié)構(gòu)由于其簡潔明快、視覺效果好等諸多優(yōu)點而得到普遍應(yīng)用,成為重要的建筑結(jié)構(gòu)形式之一。節(jié)點作為管結(jié)構(gòu)的薄弱部位,也是結(jié)構(gòu)耗能的關(guān)鍵部位,對節(jié)點的研究是鋼結(jié)構(gòu)能否大力推廣的關(guān)鍵。本文在靜力性能分析基礎(chǔ)上,對K型搭接節(jié)點通過主管局部焊接墊板的方法進行加強,并制作了 10個節(jié)點試件,進行滯回性能試驗研究,相應(yīng)的研究工作和取得研究成果如下:(1)K型搭接節(jié)點的靜力性能有限元分析:采用ANSYS10.0有限元分析軟件,在對已有的試驗進行模擬驗證基礎(chǔ)上,設(shè)計節(jié)點形式為支主管均為圓管(主圓支圓)的主管未加強、主管管壁墊板局部加強以及主管灌注混凝土的K型搭接節(jié)點進行軟件分析。通過對比得到未加強節(jié)點隱藏焊縫焊接與否,加強節(jié)點隱藏焊縫未焊接時,在支桿軸向荷載作用下,焊縫焊接情況、墊板尺寸以及混凝土對節(jié)點的破壞模式和承載力的影響。結(jié)果表明:未加強節(jié)點隱藏焊縫焊接不僅可以提高節(jié)點承載力,也可增加節(jié)點的塑性變形能力,影響節(jié)點的破壞模式。墊板和混凝土對節(jié)點加強后破壞模式不發(fā)生改變,但承載力明顯提高,墊板避免了節(jié)點處的應(yīng)力集中,增大節(jié)點的延性,使節(jié)點具有較高的安全儲備,墊板長度和厚度對節(jié)點的性能影響較小。墊板加強節(jié)點較混凝土加強節(jié)點和隱藏焊縫焊接的未加強節(jié)點相比,具有更好的受力性能和更高節(jié)點承載力。(2)墊板加強K型搭接節(jié)點滯回性能試驗研究及有限元分析:鑒于墊板加強節(jié)點的良好靜力受力性能,考慮施工工藝限制,讓節(jié)點隱藏焊縫不焊接而進行墊板加強,研究其抗震性能是本次研究的重點。為此,設(shè)計支主管截面為主圓支圓、主方支圓的墊板加強節(jié)點與未加加強節(jié)點,共10個試件進行擬靜力試驗,探討不同主管形式、墊板尺寸的節(jié)點在循環(huán)荷載下的破壞模式、承載力、抗震性能。通過觀察試驗現(xiàn)象,得到:主圓支圓試件,除K-CCE1試件節(jié)點從貫通支管處開裂外,其它節(jié)點均因搭接支管屈曲,以及兩支管與墊板的連接處焊縫產(chǎn)生較大的開裂而失效。主方支圓試件,裂縫均從兩支管的搭接部位產(chǎn)生并擴展到整個搭接區(qū)域,因較大的裂縫和支管屈曲而失去承載能力。雖然裂縫開裂和發(fā)展的部位不同,但不同主管形式的K型搭接節(jié)點,節(jié)點破壞模式相同,均為支管屈曲和焊縫破壞模式。同時,通過各節(jié)點的試驗滯回曲線,得出用以評價節(jié)點抗震性能的骨架曲線、剛度退化系數(shù)、延性系數(shù)、能量耗散系數(shù)指標,量化分析了加強節(jié)點與未加強節(jié)點試件的承載力、剛度、延性和能量耗散等性能。最后,對主圓支圓墊板加強節(jié)點實施了滯回性能模擬分析后與試驗結(jié)果做了對比。本文主要創(chuàng)新性:創(chuàng)建了考慮焊縫建模的有限元計算模型,并且驗證了計算模型的可行性。首次系統(tǒng)進了不同主管形式的墊板加強型K節(jié)點的足尺擬靜力試驗,揭示了該類節(jié)點的破壞現(xiàn)象、破壞模式和抗震性能,為該類節(jié)點高烈度抗震區(qū)合理設(shè)計與施工提供理論參考依據(jù)。
[Abstract]:Steel structure welding because of its simplicity, the advantages of good visual effects and has been widely used and become one of the important forms of building structure. As the node of the weak parts of pipe structure, key parts and structure of energy consumption of nodes is the key to promote the steel structure. This paper based on the static performance on the method of K type joint by the competent local welding plate were strengthened, and made 10 joints, carried out experimental study on hysteretic behavior, some research work and research achievements are as follows: (1) finite element static performance analysis of K type joints: by ANSYS10.0 finite element analysis software. Simulation based test in the existing design, node form branch director for circular pipe (the main branch of circular circle) director of the UN reinforced wall plate, the competent local strong and competent perfusion The software K was used to analyze the type of joints of concrete. By comparing the obtained without hidden weld joints strengthened with or without hidden weld welding reinforced joints, the supporting rod under axial load, welding, impact plate size and the failure mode of the concrete of joint and bearing capacity. The results showed that strengthening the hidden node welding can not only improve the bearing capacity of the joint, it can increase the ability of plastic deformation joints, effects of failure modes of the joints. The concrete plate and the failure modes of the joints strengthened does not change, but the bearing capacity significantly improved, the plate to avoid joint stress concentration, the ductility increases the node, the node security reserve has a high, small plate length and thickness effects on performance of nodes. Nodes than plate reinforced concrete reinforcing node and hidden weld without strengthening nodes compared with Better mechanical properties and higher load-carrying capacity. (2) type K plate reinforced joints hysteretic behavior and finite element analysis: given the good performance of static force plate reinforced joints, considering the restriction of construction technology, let the nodes and hidden weld without welding plate reinforcement, the seismic performance is the focus of this study. Therefore, the design of branch main section mainly supported circular plate round, the main party of a circle without strengthening node and reinforced joints, 10 specimens of pseudo static test, explore the different charge form, failure mode, node plate size in cyclic loading bearing capacity, seismic performance get through observation and experiment phenomenon: the main circle supported circular specimens, except K-CCE1 specimens from node through branch pipes crack, other nodes are due to overlapping pipe buckling, and connection weld pipe and two plate greatly cracking and failure. The main party A circular specimen, cracks are generated from overlapping parts of the two branch pipe is extended to the entire lap area, and loss of bearing capacity due to the larger cracks and pipe buckling. Although the cracking and crack development of different parts, but the K type joints of different charge form, the failure modes are the same, are buckling and weld pipe failure mode. At the same time, through the test of each node of the hysteresis curve, skeleton curve obtained for evaluation of the seismic behavior of the joints, the stiffness degradation coefficient, ductility coefficient and energy dissipation coefficient index, quantitative analysis of the node and the node does not strengthen the strengthening of bearing capacity, the stiffness, ductility and energy dissipation. Finally, the main circle supported circular plate reinforced node implementation of the hysteretic performance after simulation analysis and the test results were compared. The main innovation of this paper: create the finite element model of weld seam calculation model considering, and verify the calculation model For the first time, the full scale quasi-static test of the strengthened K joints with different forms of charge is carried out. The failure mode, failure mode and seismic performance of the joints are revealed, which provides a theoretical basis for the reasonable design and construction of the high intensity seismic area of this kind of joints.

【學(xué)位授予單位】：寧夏大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU392.3

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