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Control Mechanisms of Stress Redistribution Locus in Structures

机译:结构中应力重新分布轨迹的控制机制

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摘要

Dependency of results of structural analysis on constitutive equations obstructs the application of inelastic analysis methods to design. To overcome this difficulty, a realistic inelastic analysis approach assisted by the stress redistribution locus (SRL) has been proposed for the purpose of design application. The basis of this approach is the existence of an unique SRL in each structure. The final goal of this study is to assure the uniqueness of SRL.rnTo clarify control mechanisms of SRLs in structures, elastic-plastic and elastic-creep behaviors of fundamental structures are analyzed. The first model is a stepped bar model subjected to a tension load. The second one is a stepped beam model subjected to a bending load.It is revealed that the elastic cores control SRLs in structures, therefore that SRLs are independent of constitutive equations. Structures with large elastic cores have steep SRLs because elastic cores constrict strain. When elastic cores are reduced, SRLs gradually change from steep to gentle as the constraint becomes weaker. Under bending load, elastic cores shrink to the neutral axis in the same way. Therefore, many structure mainly subjected to bending load have similar SRLs.
机译:结构分析结果对本构方程的依赖性阻碍了非弹性分析方法在设计中的应用。为了克服这个困难,出于设计应用的目的,已经提出了一种由应力重分布轨迹(SRL)辅助的现实的非弹性分析方法。这种方法的基础是每个结构中都存在唯一的SRL。这项研究的最终目的是确保SRL的唯一性。为了阐明SRL在结构中的控制机制,分析了基础结构的弹塑性和弹性蠕变行为。第一模型是承受拉力载荷的阶梯杆模型。第二个是受弯曲载荷作用的阶梯梁模型。揭示了弹性芯控制结构中的SRL,因此SRL与本构方程无关。具有大弹性芯的结构具有陡峭的SRL,因为弹性芯会限制应变。当弹性芯减少时,随着约束变得更弱,SRL从陡峭变为平缓。在弯曲载荷下,弹性芯以相同的方式收缩到中性轴。因此,许多主要承受弯曲载荷的结构具有相似的SRL。

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