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EXTENDED TANGENTIAL-SUBLOADING SURFACE MODEL FOR GENERAL LOADING BEHAVIOR OF SOILS : APPLICATION TO NONPROPORTIONAL LOADINGS

机译:土的一般荷载行为的扩展切向荷载表面模型:在非比例荷载中的应用

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摘要

The conventional elastoplastic model premising that the interior of yield surface is a purely elastic domain is incapable of describing the plastic deformation by the rate of stress inside the yield surface. Thus, it is inapplicable to the description of cyclic loading behavior. Besides, the traditional elastoplastic model is independent of the stress rate component tangential to the yield surface. Therefore, it predicts an unrealistically high stiffness modulus for nonproportionalloading process deviating significantly from proportional one. The extended tangential-subloading surface model proposed by Hashiguchi and Tsutsumi (2001) would be capable of describing the cyclic loading behavior and the inelastic strain rate induced by the stress rate component tangential to the subloading surface. In this article, the extended tangential-subloading surface model is applied to the prediction of deformation behavior of sands subjected to various loading ranging from proportional to cyclic nonproportionalloading. The validity is verified by comparing with the various test data. Then, it is revealed that the incorporation of the strain rate due to the stress rate component tangential to the subloading surface is of importance for the description of nonproportional loading behavior.
机译:传统的弹塑性模型假定屈服面的内部为纯弹性域,因此无法通过屈服面内部的应力率描述塑性变形。因此,它不适用于循环加载行为的描述。此外,传统的弹塑性模型独立于与屈服面相切的应力率分量。因此,它预测了非比例加载过程中与比例模量显着偏离的不切实际的高刚度模量。 Hashiguchi和Tsutsumi(2001)提出的扩展的切向子加载表面模型将能够描述循环加载行为和由与子加载表面相切的应力率分量引起的非弹性应变率。在本文中,将扩展的切向子加载表面模型用于预测砂土在各种载荷(从比例到周期性非比例载荷)下的变形行为。通过与各种测试数据进行比较来验证有效性。然后,揭示了由于与子加载表面相切的应力率分量而导致的应变率的合并对于描述非比例加载行为很重要。

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