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In this paper the reason and criterion of the application of the model to plastic limit analysis are discussed, and an algorithm of computing plastic limit load is given.


Response number can also be considered as the ratio of the inertia force at the impulsive loading to the plastic limit load of the structure.


The objective function corresponds to the dissipation power which is to be minimized and an upper bound to the plastic limit load of a structure can then be calculated by solving the minimum optimization problem.


A 'widerno effect' or a 'widerhigher' pattern may be observed if the crack extension occurs at the plastic limit load and if either plane strain or plane stress conditions prevail.


It is shown in various examples that, for loads less than the rigid/perfectly plastic limit load, strain hardening has a negligible effect, whereas for greater loads elastic strains can reasonably be neglected.


To further illustrate the newly derived solution, formulas and numerical results for the plastic limit pressure are provided.


In this paper the reason and criterion of the application of the model to plastic limit analysis are discussed, and an algorithm of computing plastic limit load is given.


Response number can also be considered as the ratio of the inertia force at the impulsive loading to the plastic limit load of the structure.


The objective function corresponds to the dissipation power which is to be minimized and an upper bound to the plastic limit load of a structure can then be calculated by solving the minimum optimization problem.


A 'widerno effect' or a 'widerhigher' pattern may be observed if the crack extension occurs at the plastic limit load and if either plane strain or plane stress conditions prevail.


It is shown in various examples that, for loads less than the rigid/perfectly plastic limit load, strain hardening has a negligible effect, whereas for greater loads elastic strains can reasonably be neglected.


 其他 

 Based on the viewpoint of limit analysis,two equations can be used to evaluate the plastic limit pressures of welded branch pipe tee connection are proposed. The effective factors and the validity of these equations are discussed by using the experimental data. The results have shown that the equations derived from the yield of cylindercylinder intersection and equal area reinforcement are usable in the engineering design,and more accurate results can be obtained with the equation derived from insersection... Based on the viewpoint of limit analysis,two equations can be used to evaluate the plastic limit pressures of welded branch pipe tee connection are proposed. The effective factors and the validity of these equations are discussed by using the experimental data. The results have shown that the equations derived from the yield of cylindercylinder intersection and equal area reinforcement are usable in the engineering design,and more accurate results can be obtained with the equation derived from insersection yield. It has a great value to spread this equation. The plastic limit load of tee connection will increase as the ratio of pipe radius and wall increase. However,the influential law of the parameter d/D and limit pressure need to be studied deeply.  基于极限分析的观点,得到了两个适于工程上采用的焊制三通塑性极限压力估算式,并结合试验数据进行了验证和影响因素分析。结果表明,基于相贯线屈服和等面积补强得到的估算公式是可用的,其中相贯线屈服分析得到的公式最精确,具有推广价值,主管厚径比对三通塑性承载能力有加强作用,而管径比对极限压力的影响规律有待进一步研究。  The biggest difference between fixed roof tanks and floated roof tanks was that the formers need to bear a specified internal pressure, compression ring was the major bearing component of connecting the roof (spherical shell) and the cylinder. Compression ring was in angle type according to the current standard, thus it could not bear the specified internal pressure when the volume of tanks goes up. The overall analysis of strength and stability of different scales of fixed roof storage tanks with three different... The biggest difference between fixed roof tanks and floated roof tanks was that the formers need to bear a specified internal pressure, compression ring was the major bearing component of connecting the roof (spherical shell) and the cylinder. Compression ring was in angle type according to the current standard, thus it could not bear the specified internal pressure when the volume of tanks goes up. The overall analysis of strength and stability of different scales of fixed roof storage tanks with three different types(angle type, conical type and toroidal type) under the internal pressure was presented.The analysis and contrast of deformation pattern, state of stress, plastic deformation history, plastic limit load and limit load of elastic buckling are analyzed and contrasted.  拱顶储罐与浮顶储罐的最大差别是前者要承受一定的内压 ,承压圈是连接顶盖 (球壳 )与筒体的主要受力构件。在现行设计规范中 ,承压圈通常是角钢型的 ,但当储罐趋于大型化时 ,角钢型承压圈无法承受一定的设计内压。对内压作用下具有三种结构型式承压圈 (角钢型、圆锥壳型、圆环壳型 )各种容积的拱顶储罐进行了比较全面的强度分析与稳定性分析。最后对三种结构型式的拱顶储罐的变形方式、应力状态、塑性变形历史、塑性极限压力、弹性失稳临界压力进行了分析与对比。  
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