开菱形孔钢板墙力学性能研究

发布时间：2018-07-04 17:07

本文选题：开菱形孔钢板墙 + 理论分析　；参考：《广州大学》2017年硕士论文

【摘要】：钢板剪力墙作为一种抗侧力体系,具有弹性刚度大、承载力较高、延性好、自重轻、施工方便等优点,已经受到广泛的研究并在工程中逐渐得到应用。本文针对带竖缝钢板墙缝端存在明显的应力集中,且在侧向荷载作用下其矩形连接带中间截面弯矩较小很难进入塑性状态的问题,提出一种新型的开菱形孔钢板墙,对其力学性能进行了系统的理论分析和试验研究,通过研究不同构造参数对该钢板墙力学性能的影响规律,可为该新型钢板阻尼墙的设计、实际应用提供参考。主要研究内容和成果如下:1、提出开菱形孔钢板墙的简化力学模型,在此基础上推导了钢板墙中蝶形带的承载力、柔度以及钢板墙整体初始弹性刚度的理论公式。研究表明,为避免蝶形带中部界面出现局部剪切破坏,蝶形带高度与开孔宽度的比值h/b应大于3.5。由于蝶形带发生剪切破坏时延性较差,设计时应避免,为此建议取h/b≥4。2、采用ABAQUS建立了开菱形孔钢板墙的精细化有限元模型,并进行单调加载分析。数值分析结果验证了蝶形带的承载力、柔度公式和钢板墙弹性刚度公式的正确性。对比开菱形孔钢板墙结构和带竖缝钢板墙结构的承载力,验证开菱形孔的合理性,当开孔宽较小而蝶形带宽度较大,两种钢板墙的承载力及初始刚度相差较小。理论分析和数值模拟的结果表明,蝶形带存在3种不同的平面内破坏模态,即弯曲破坏、整体弯剪破坏和局部剪切破坏,其中局部剪切破坏延性较差应避免出现这种破坏模态。3、采用ABAQUS对开菱形孔钢板墙模型进行非线性往复加载分析,研究开孔宽高比、蝶形带宽高比、开孔高度比、墙板高厚比、高宽比等形状参数对钢板墙性能的影响规律。研究结果表明,开孔宽高比或蝶形带宽高比增大时,钢板墙的初始刚度及承载力都有不同程度地增大,但同时承载力退化速度和刚度退化速度加快,耗能性能变弱。当开孔高度比或高厚比减小时后期承载力快速降低,延性变差。小高宽比的钢板墙延性较差,且滞回曲线更容易出现捏拢现象。当钢板墙中的蝶形带将以弯曲变形为主时,延性较好且材料利用率较高。4、设计制造了两个1:3比例的不同高宽比的开菱形孔钢板墙试件,进行低周往复加载试验,观察其变形和破坏特征,得出滞回曲线,并在此基础上分析了其承载力、延性、耗能性能、刚度和承载力退化等指标。结果表明,大高宽比的开菱形孔钢板墙在加载前期主要出现整体屈曲变形,后期出现整体屈曲与局部屈曲相结合的相关屈曲变形,具有稳定的承载力和耗能能力,延性更好;小高宽比的开菱形孔钢板墙则主要以蝶形带的局部屈曲为主,在加载中期承载力有下降,之后出现明显的强化现象,后期耗能能力较弱,延性较差。5、采用有限元软件ABAQUS模拟了开菱形孔钢板墙的循环加载试验,将分析结果与试验结果进行了对比。分析表明,有限元模拟较好的反映了开菱形孔钢板墙试件的各项力学性能特征,通过累积塑性变形可以判断钢板可能出现断裂的位置,与试验现象一致。通过对比试验与理论计算得到的刚度和承载力,进一步验证了理论分析的正确性。6、对单跨框架—开菱形孔钢板墙结构进行参数分析,研究不同开孔参数、钢板墙偏心布置、钢板墙的边界条件等因素对框架—开菱形孔钢板墙结构内力的影响,提出该类钢板墙的简化建模方法以提高建模效率。研究表明,开孔钢板墙偏心布置不影响其本身的屈服位移及框架的屈服位移,但影响底部剪力;释放转动自由度时,钢板墙的弹性刚度明显降低,而释放竖向自由度则不影响弹性刚度;由采用梁单元与采用壳单元建立的两种模型得到的荷载—位移角关系曲线结果基本一致。
[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.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU973.16

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