Dynamic rocking response of a rigid planar block on a nonlinear hysteretic Winkler foundation
Dynamic rocking response of a rigid planar block on a nonlinear hysteretic Winkler foundation
复制标题
非线性迟滞温克勒基础上刚性平面块的动态摇摆响应
DOI：
10.1002/eqe.3470
复制
发表时间：
2021
影响因子：
4.5
通讯作者：
Qi Ge
中科院分区：
文献类型：
--
作者：
Yang Lu;F. Xiong;Qi Ge
在最近的土-结构相互作用（SSI）研究中，提出了一种新的设计理念，即“摇晃隔离”，即利用非线性基础反应来进行结构的抗震保护。允许结构在其基础上岩石，可以使基础隆起和土壤屈服产生的非线性，从而限制地震对结构的作用，有助于具有可控残余变形的弹性SSI系统。目前的工作提出了一种改进的基于Winkler的摇摆基础模型，作为一种有效的实用工具来计算一个理想的摇摆隔离系统的动力响应，该系统被认为是一个刚性矩形块在非线性滞后基础上的摇摆，允许基座隆起。现有的Winkler模型通常忽略了土体的剪切-压缩耦合特性，与之相比，通过使用光滑双轴滞回单元来描述基础处拉力和位移之间的点方向本构关系，进行了改进。根据已发表的粘性地基试验和数值模拟数据对该地基模型进行了校准和验证。导出了用于估计基础摇摆刚度和破坏包络线的解析表达式，该表达式描述了基础上产生的极限合力之间的相互作用。通过非线性响应历史分析，利用所提出的模型对一类柔性支承刚性岩体的自由振动和地震响应进行了研究。研究发现，剪切-压缩耦合土体特性导致的滑动倾向于降低小长细比砌块的自由振动摇摆响应，而可能增加或减少重荷载基础上砌块的地震倾覆潜力。
A new design philosophy termed “rocking isolation” has been advocated in recent studies on soil–structure interaction (SSI) toward utilizing nonlinear foundation response for seismic protection of structures. Allowing structures to rock on their foundation enables nonlinearities arising from base uplifting and soil yielding to limit seismic actions on structures, contributing to resilient SSI systems with controllable residual deformation. The current work presents an improved Winkler‐based rocking foundation model as an efficient practical tool to calculate the dynamic response of a rocking isolation system idealized as a rigid rectangular block rocking on a nonlinear hysteretic foundation allowing for base uplift. Compared with existing Winkler models where coupled shear‐compressive soil behavior is usually ignored, improvements are made by using smooth biaxial hysteretic elements to describe the point‐wise constitutive relation between tractions and displacements at the base. The foundation model is calibrated and validated against published experimental and numerical simulation data on clayey foundations. Analytical expressions are derived to estimate foundation rocking stiffness and failure envelope which describes the interaction between ultimate resultant forces developed on the foundation. The free‐vibrational and seismic responses of a class of flexibly supported rigid rocking blocks are examined using the proposed model through nonlinear response‐history analyses. It is found that sliding due to the coupled shear‐compressive soil behavior tends to reduce free‐vibrational rocking response of blocks with smaller slenderness ratios, while it may increase or decrease seismic overturning potential of blocks on heavily loaded foundations.
DOI：
10.1061/(asce)em.1943-7889.0000410
发表时间：
2012-08
期刊：
Journal of Engineering Mechanics-asce
影响因子：
--
作者：
E. Dimitrakopoulos;M. DeJong
通讯作者：
E. Dimitrakopoulos;M. DeJong
DOI：
10.1098/rspa.2012.0026
发表时间：
2012-08
期刊：
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
影响因子：
--
作者：
E. Dimitrakopoulos;M. DeJong
通讯作者：
E. Dimitrakopoulos;M. DeJong
影响因子：
4.5
作者：
M. DeJong;E. Dimitrakopoulos
通讯作者：
M. DeJong;E. Dimitrakopoulos