本文選題：開(kāi)菱形孔鋼板墻 + 理論分析��； 參考：《廣州大學(xué)》2017年碩士論文

【摘要】：鋼板剪力墻作為一種抗側(cè)力體系,具有彈性剛度大、承載力較高、延性好、自重輕、施工方便等優(yōu)點(diǎn),已經(jīng)受到廣泛的研究并在工程中逐漸得到應(yīng)用。本文針對(duì)帶豎縫鋼板墻縫端存在明顯的應(yīng)力集中,且在側(cè)向荷載作用下其矩形連接帶中間截面彎矩較小很難進(jìn)入塑性狀態(tài)的問(wèn)題,提出一種新型的開(kāi)菱形孔鋼板墻,對(duì)其力學(xué)性能進(jìn)行了系統(tǒng)的理論分析和試驗(yàn)研究,通過(guò)研究不同構(gòu)造參數(shù)對(duì)該鋼板墻力學(xué)性能的影響規(guī)律,可為該新型鋼板阻尼墻的設(shè)計(jì)、實(shí)際應(yīng)用提供參考。主要研究?jī)?nèi)容和成果如下:1、提出開(kāi)菱形孔鋼板墻的簡(jiǎn)化力學(xué)模型,在此基礎(chǔ)上推導(dǎo)了鋼板墻中蝶形帶的承載力、柔度以及鋼板墻整體初始彈性剛度的理論公式。研究表明,為避免蝶形帶中部界面出現(xiàn)局部剪切破壞,蝶形帶高度與開(kāi)孔寬度的比值h/b應(yīng)大于3.5。由于蝶形帶發(fā)生剪切破壞時(shí)延性較差,設(shè)計(jì)時(shí)應(yīng)避免,為此建議取h/b≥4。2、采用ABAQUS建立了開(kāi)菱形孔鋼板墻的精細(xì)化有限元模型,并進(jìn)行單調(diào)加載分析。數(shù)值分析結(jié)果驗(yàn)證了蝶形帶的承載力、柔度公式和鋼板墻彈性剛度公式的正確性。對(duì)比開(kāi)菱形孔鋼板墻結(jié)構(gòu)和帶豎縫鋼板墻結(jié)構(gòu)的承載力,驗(yàn)證開(kāi)菱形孔的合理性,當(dāng)開(kāi)孔寬較小而蝶形帶寬度較大,兩種鋼板墻的承載力及初始剛度相差較小。理論分析和數(shù)值模擬的結(jié)果表明,蝶形帶存在3種不同的平面內(nèi)破壞模態(tài),即彎曲破壞、整體彎剪破壞和局部剪切破壞,其中局部剪切破壞延性較差應(yīng)避免出現(xiàn)這種破壞模態(tài)。3、采用ABAQUS對(duì)開(kāi)菱形孔鋼板墻模型進(jìn)行非線(xiàn)性往復(fù)加載分析,研究開(kāi)孔寬高比、蝶形帶寬高比、開(kāi)孔高度比、墻板高厚比、高寬比等形狀參數(shù)對(duì)鋼板墻性能的影響規(guī)律。研究結(jié)果表明,開(kāi)孔寬高比或蝶形帶寬高比增大時(shí),鋼板墻的初始剛度及承載力都有不同程度地增大,但同時(shí)承載力退化速度和剛度退化速度加快,耗能性能變?nèi)�。�?dāng)開(kāi)孔高度比或高厚比減小時(shí)后期承載力快速降低,延性變差。小高寬比的鋼板墻延性較差,且滯回曲線(xiàn)更容易出現(xiàn)捏攏現(xiàn)象。當(dāng)鋼板墻中的蝶形帶將以彎曲變形為主時(shí),延性較好且材料利用率較高。4、設(shè)計(jì)制造了兩個(gè)1:3比例的不同高寬比的開(kāi)菱形孔鋼板墻試件,進(jìn)行低周往復(fù)加載試驗(yàn),觀(guān)察其變形和破壞特征,得出滯回曲線(xiàn),并在此基礎(chǔ)上分析了其承載力、延性、耗能性能、剛度和承載力退化等指標(biāo)。結(jié)果表明,大高寬比的開(kāi)菱形孔鋼板墻在加載前期主要出現(xiàn)整體屈曲變形,后期出現(xiàn)整體屈曲與局部屈曲相結(jié)合的相關(guān)屈曲變形,具有穩(wěn)定的承載力和耗能能力,延性更好;小高寬比的開(kāi)菱形孔鋼板墻則主要以蝶形帶的局部屈曲為主,在加載中期承載力有下降,之后出現(xiàn)明顯的強(qiáng)化現(xiàn)象,后期耗能能力較弱,延性較差。5、采用有限元軟件ABAQUS模擬了開(kāi)菱形孔鋼板墻的循環(huán)加載試驗(yàn),將分析結(jié)果與試驗(yàn)結(jié)果進(jìn)行了對(duì)比。分析表明,有限元模擬較好的反映了開(kāi)菱形孔鋼板墻試件的各項(xiàng)力學(xué)性能特征,通過(guò)累積塑性變形可以判斷鋼板可能出現(xiàn)斷裂的位置,與試驗(yàn)現(xiàn)象一致。通過(guò)對(duì)比試驗(yàn)與理論計(jì)算得到的剛度和承載力,進(jìn)一步驗(yàn)證了理論分析的正確性。6、對(duì)單跨框架—開(kāi)菱形孔鋼板墻結(jié)構(gòu)進(jìn)行參數(shù)分析,研究不同開(kāi)孔參數(shù)、鋼板墻偏心布置、鋼板墻的邊界條件等因素對(duì)框架—開(kāi)菱形孔鋼板墻結(jié)構(gòu)內(nèi)力的影響,提出該類(lèi)鋼板墻的簡(jiǎn)化建模方法以提高建模效率。研究表明,開(kāi)孔鋼板墻偏心布置不影響其本身的屈服位移及框架的屈服位移,但影響底部剪力;釋放轉(zhuǎn)動(dòng)自由度時(shí),鋼板墻的彈性剛度明顯降低,而釋放豎向自由度則不影響彈性剛度;由采用梁?jiǎn)卧c采用殼單元建立的兩種模型得到的荷載—位移角關(guān)系曲線(xiàn)結(jié)果基本一致。
[Abstract]:Steel plate shear wall, as an anti lateral force system, has many advantages, such as large elastic stiffness, high bearing capacity, good ductility, light weight and convenient construction. It has been widely studied and applied gradually in engineering. In this paper, there is obvious stress concentration in the seam end of vertical slit steel plate wall, and its rectangular connection belt is in the middle under lateral load. It is difficult to enter the plastic state of the small section bending moment. A new type of rhombus hole steel plate wall is put forward. The mechanical properties of the steel plate wall are analyzed theoretically and experimentally. The influence of different structural parameters on the mechanical properties of the steel plate wall can be studied. It can provide reference for the design of the new type steel plate damping wall and the practical application. The main contents and achievements are as follows: 1, a simplified mechanical model of a diamond shaped steel plate wall is proposed. On this basis, the bearing capacity, flexibility and the theoretical formula of the initial elastic stiffness of the plate wall in the steel plate wall are derived. The study shows that the height of the butterfly belt and the width of the hole width can be avoided in order to avoid the local shear failure in the middle boundary of the butterfly belt. The ratio h/b of the degree should be greater than that of 3.5. because the ductility of the butterfly belt is poor in shear failure, and the design should be avoided. Therefore, it is suggested to take h/b more than 4.2. The finite-element model of the diamond shaped steel plate wall is established by ABAQUS, and the monotonic loading analysis is carried out. The numerical analysis results verify the bearing capacity of the butterfly belt, the flexibility formula and the elasticity of the steel plate wall. The correctness of the stiffness formula. Comparing the bearing capacity of the rhomboid steel plate wall structure and the vertical slit steel plate wall structure, the rationality of the opening of the diamond shaped hole is verified. When the width of the opening hole is smaller and the width of the butterfly band is larger, the difference between the bearing capacity and the initial stiffness of the two kinds of steel plate walls is small. The results of theoretical analysis and numerical simulation show that there are 3 different kinds of butterfly belts. In plane failure modes, bending failure, whole bending and shear failure and local shear failure, the failure mode of local shear failure should be avoided, such as.3, and ABAQUS is used to carry out nonlinear reciprocating loading analysis on the open rhombic steel plate wall model, and the width to height ratio of open hole, the ratio of butterfly shape bandwidth, the height ratio of opening hole, and the thickness ratio of the wall plate are studied. The results show that the initial stiffness and bearing capacity of the steel plate wall increase in varying degrees when the width to height ratio or the butterfly width ratio increases, but at the same time, the degenerate speed and stiffness degradation speed of the bearing capacity and the energy dissipation performance weaken. When the height ratio of opening to the hole is reduced, the ratio of the height to the height of the opening is reduced. The bearing capacity of the steel plate with small height to width ratio is poor, and the hysteresis curve is more likely to be pinched. When the butterfly belt in the steel plate wall will be dominated by bending deformation, the ductility is better and the material utilization ratio is higher.4. The design and manufacture of two 1:3 ratio of different height and width ratio of open diamond wall test parts In the low cycle reciprocating loading test, the deformation and failure characteristics are observed and the hysteresis curves are obtained. On this basis, the bearing capacity, ductility, energy dissipation, stiffness and bearing capacity degradation are analyzed. The results show that the overall buckling deformation of the open diamond wall with large height to width ratio is mainly caused by the overall buckling and the overall buckling in the later period. The related buckling deformation combined with local buckling has stable bearing capacity and energy dissipation capacity, and the ductility is better. The small Gao Kuan ratio open rhombus hole steel plate wall is mainly based on the local buckling of the butterfly belt. In the middle of the loading capacity, the bearing capacity is decreased, after which there is obvious strengthening phenomenon, the late energy dissipation capacity is weak, the ductility is poor.5, the finite element is used. The software ABAQUS simulates the cyclic loading test of a diamond shaped steel plate wall, and compares the analysis results with the test results. The analysis shows that the finite element simulation reflects well the mechanical properties of the steel plate wall specimens opening the diamond shaped hole. By the cumulative plastic deformation, the possible fracture position of the steel plate can be judged and the test phenomenon is one. By comparing the stiffness and the bearing capacity obtained by the comparison test and theoretical calculation, the correctness of the theoretical analysis.6 is further verified. The parameters of the single span frame open rhombus steel plate wall structure are analyzed, the different opening parameters, the eccentric layout of the steel plate wall, the boundary conditions of the steel plate wall and so on are applied to the internal forces of the frame open rhombus hole steel plate wall. The simplified modeling method of this kind of steel plate wall is proposed to improve the modeling efficiency. The study shows that the eccentric layout of the open plate wall does not affect its yield displacement and the yield displacement of the frame, but affects the bottom shear force. When the rotational freedom is released, the elastic stiffness of the steel plate wall decreases obviously, while the release of the vertical freedom does not affect the elasticity. The results of load displacement angle curves obtained from the two models established by using beam element and shell element are basically the same.
【學(xué)位授予單位】：廣州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU973.16

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