共查询到20条相似文献,搜索用时 46 毫秒
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关于逐段变形效应叠加法的证明与讨论 总被引:1,自引:0,他引:1
提出逐段变形效应叠加法适用于含有悬臂梁部分的结构,一般不适用于简支梁. 对于简支梁,用荷载叠加法比较方便. 用相当简单的方法证明了逐段变形效应叠加法. 讨论了该方法在静定结构与静不定结构中应用的可能性. 由于该方法适用于含有悬臂部分的结构,提议将该方法改称为分段悬臂梁叠加法. 相似文献
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利用梁的弯曲刚度与位移成反比的关系, 可较为方便地计算变截面悬臂梁端截面的位移.该
方法是区别于载荷叠加法和逐段变形效应叠加法的叠加方法. 相似文献
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为了加深学生对位移法及阶梯梁位移计算的理解,以阶梯式简支梁为例,分别利用积分法、常规图乘法、刚度叠加法及位移法求解了阶梯式简支梁的位移。计算结果表明:利用位移法求解阶梯式简支梁的位移具有独特的优势,可显著减少计算工作量并提高计算准确率,值得在教学过程中推广。
相似文献8.
关于位移法计算有侧移斜梁的研究 总被引:2,自引:0,他引:2
针对用位移法计算有侧移斜梁时遇到的几个问题进行了研究,利用运动学原理对斜梁位移进行分析,采用力法对几种常见载荷作用下的斜梁进行理论推导,得到了几个重要结论: 一是斜梁的侧移计算公式,二是一端固定、一端定向支承(支杆与斜梁斜交时)的有侧移单跨斜梁的转角位移方程、固端弯矩分别与两端固定支承的水平梁的相同,所以计算此类斜梁时可以按两端固定支承的单跨水平梁处理. 相似文献
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Dr. H. Schmieg Prof. Dr. P. Vielsack 《Archive of Applied Mechanics (Ingenieur Archiv)》1985,55(5):358-367
Summary Using the theory of plastic hinges the equations of motion for a clamped beam made of elastic-plastic material are derived. As examples the response of the system to impact and harmonic excitation are discussed. The analytical results are compared with experimental investigations.
Wachstum plastischer Deformationen eines Druckstabes bei Zwangserregung
Übersicht Unter Verwendung der Fließgelenktheorie werden die Bewegungsgleichungen des eingespannten, gedrückten Stabes aus elastisch-plastischem Material hergeleitet. Als Beispiele werden die Antwort des Systems auf Stoß- und harmonische Erregung diskutiert und die analytischen Ergebnisse mit Experimenten verglichen.相似文献
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This work discusses the choice of a reference frame for beam section stiffness properties. Established concepts as the center of elasticity, the center of stiffness and the center of compliance are discussed and contextualized. An interpretation of univocally defined generalized strain transformations is given in terms of minimization of appropriate norms of the stiffness and compliance matrices of the beam section that univocally define special reference points. Transformations of generalized strain perturbations that preserve the angular strain are sought. They are subsequently constrained to represent a change of reference point, and further restricted to lie in the plane of the section. Each transformation is univocally defined and given a clear mathematical and geometrical interpretation. It is recognized that transformations that decouple forces and linear strains from moments and angular strains cannot be described as a mere change of reference point. 相似文献
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Kazumi Tanuma 《Journal of Elasticity》1994,36(3):257-270
We consider a two dimensional deformation of an infinite anisotropic elastic material which contains a plane crack. When tractions are specified over the crack faces, we give a formula for the corresponding relative displacements of the two sides of the crack. We also consider the inverse problem of determining the elastic constants by measuring the tractions and the corresponding relative displacements on the crack. 相似文献
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二层刚架动静态综合性实验设计研究 总被引:4,自引:0,他引:4
根据学科的发展并结合作者的实践,设计了二层刚架动静态综合性教学实验,包
括最大静态应力应变、最大动态应力应变的测试. 通过一组综合性实验作为示范,介绍二层
刚架的教学实验要求、实验把握、实验讨论等,说明了二层刚架具有使学生理论融会贯通、
培养学生思维形象化和综合分析能力及动手能力的特点,亦反映了二层刚架适合于教学实验
的特色. 相似文献
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王辅俊 《应用数学和力学(英文版)》1991,12(10):1017-1021
In this paper we study the stability for equilibrium points of equations in two-population dynamics.We discuss two predator-prey-patch models.Model1 is described by a differential equation.Model2 is described by an integral differential equation.We obtain the conditions for the stability of their equilibrium points.The results show that the overall population stability despite local extinction is realizable. 相似文献
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TNT当量系数是危险品工程抗爆设计和安全距离确定的重要依据。为确定H1和H2两种新型高能发射药的TNT当量系数,分别开展了10 kg TNT和新型发射药的空气自由场静爆实验。基于修正的当量系数计算方法和测量得到的不同爆心距离处冲击波超压时程曲线,确定了不同比例距离处两种高能发射药的超压和比冲量TNT当量系数。研究结果表明,发射药爆炸产生的冲击波传播规律与TNT炸药爆炸产生的冲击波传播规律相同,符合爆炸相似律,相同质量发射药爆炸产生的冲击波超压和比冲量都显著高于TNT的。随着比例距离的增大,H1的超压当量系数先增大后减小,最大值为1.34;H2的超压当量系数逐渐减小,最大值为1.26。两种新型发射药的比冲量TNT当量系数均随比例距离的增大先减小后增大,H2的比冲量TNT当量系数大于H1的,最大值为1.38。本文中修正的计算方法能更准确计算被试样品的TNT当量系数,实验结果可为提高抗爆结构安全性设计提供参考。 相似文献
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《International Journal of Solids and Structures》2007,44(16):5289-5300
Investigations of wave and vibration properties of single- or multi-walled carbon nanotubes based on nonlocal beam models have been reported recently. However, there are numerous inconsistencies in the handling of the governing equations, applied forces, and boundary conditions based on some of the reported nonlocal beam models. In this paper, the consistent equations of motion for the nonlocal Euler and Timoshenko beam models are provided, and some issues on the nonlocal beam theories are discussed. The models are then applied to the studies of wave properties of single- and double-walled nanotubes. The wave and vibration properties of the nanotubes based on the presented nonlocal beam equations are studied, and scale effects are discussed. 相似文献
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The transformations, which are similar to Mangier's transformation, are given in this paper, and make the two kinds of entrance region flow of axially symmetrical laminar boundary layer in internal way into the flow of two-dimensional boundary layer, and simplify the proboems. The simplified equations can be solved by the 2-D boundary layer theory. Therefore, a new way is opened up to solve the axially symmetrical flow in the entrance region of internal way.Project Supported by the Scientific Fund of Chinese Academy of Science. 相似文献