Strain rate effects on shear modulus and damping of normally consolidated clay
Strain rate effects on shear modulus and damping of normally consolidated clay
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DOI：
10.1520/gtj11005j
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发表时间：
1995-09
影响因子：
1.6
通讯作者：
S. Shibuya;T. Mitachi;Fumihiko Fukuda;T. Degoshi
中科院分区：
文献类型：
--
作者：
S. Shibuya;T. Mitachi;Fumihiko Fukuda;T. Degoshi
通过室内试验研究了剪应变率对正常固结粘土剪切模量和滞回阻尼的影响。在不排水循环扭剪试验中，研究了循环剪应变幅在10−6和10−3之间时剪应变率的影响。当加载频率在0.005 ~ 0.1Hz之间变化时，等效剪切模量对剪切应变速率不敏感。另一方面，滞后阻尼增加，根据剪切应变率的降低。此外，对于小于2 × 10−5的剪切应变，最大刚度几乎不受剪切应变率、加载类型、循环次数和循环预应变的影响;因此，它可以被表征为伪弹性剪切模量。试验结果的基础上，它的结论是，当应用的结果，室内循环加载试验的原位循环加载问题的分析，剪切应变率对滞回阻尼的影响，应适当地评估，以匹配在现场预期的加载频率。
A laboratory investigation into the effects of shear strain rate on shear modulus and hysteretic damping of normally consolidated clays was carried out. The effects of shear strain rate were examined at cyclic shear strain amplitudes between 10−6 and 10−3 in undrained cyclic torsion shear tests. When the frequency of loading was changed between 0.005 and 0.1 Hz, the equivalent shear modulus was insensitive to the rate of shear straining. On the other hand, the hysteretic damping increased according to the decrease in the shear strain rate. Furthermore, for shear strains less than about 2 × 10−5, the maximum stiffness was hardly influenced by the shear strain rate, type of loading, number of cycles, and the cyclic prestraining; it can therefore be characterized as pseudoelastic shear modulus. On the basis of the test results, it is concluded that when applying the results of laboratory cyclic loading tests to the analysis of in situ cyclic loading problems, the effects of shear strain rate on hysteretic damping should be properly evaluated to match the frequency of loading expected in the field.