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Modelling of reinforced concrete structures subjected to cyclic loading

机译:循环荷载作用下钢筋混凝土结构的建模

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Formulations are presented by which a smeared rotating crack model, incorporated into an iterative total-load secant-stiffness framework, is employed to analyse reinforced concrete structures subjected to reversed cyclic loading. The analytical studies are performed using the two-dimensional nonlinear finite element program VecTor2, which employs the Disturbed Stress Field Model as its concrete model. Emphasis is placed on the crack-slip mechanism which calculates the slip as a function of the shear stress along the crack, accounting for cyclic degradation due to load reversals. The crack-slip model described keeps track of two distinct and alternately active cracks within one element by monitoring the change in direction of the principal stress field. A cyclic degradation law is empirically derived from tests performed on push-off specimens and included in the formulation. The slip strains in each loading cycle, calculated accordingly, are treated as independent plastic deformations. The analytical procedure is initially verified against a series of shell specimens tested under reversed cyclic shear loading. Shear wall specimens tested in the laboratory are then analysed with the new model. Better estimates of the energy dissipation, failure mode, and deformation response are obtained when accounting for cyclic crack-slip degradation.
机译:提出了配方,通过该配方,将涂污的旋转裂纹模型(合并到迭代的总荷载割线-刚度框架中)用于分析承受反向循环荷载的钢筋混凝土结构。分析研究是使用二维非线性有限元程序VecTor2进行的,该程序采用了“扰动应力场”模型作为其具体模型。重点放在裂纹滑动机制上,该机制根据沿裂纹的剪切应力来计算滑动,这是由于载荷反向导致的循环退化的原因。所描述的裂纹滑动模型通过监视主应力场方向的变化来跟踪一个元素内的两个不同且交替活动的裂纹。循环降解定律是根据经验从推压样品上进行的试验得出的,并包含在配方中。相应计算出的每个加载周期中的滑动应变被视为独立的塑性变形。最初针对一系列在反向循环剪切载荷下测试的壳样本验证了该分析程序。然后使用新模型分析在实验室测试的剪力墙样本。考虑到周期性的裂纹-滑动退化,可以更好地估计能量耗散,破坏模式和变形响应。

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