钢板剪力墙的条带模型(Strip Model,SM)不仅能准确地模拟出钢板的屈曲后行为,而且能明显地节省计算资源。因此,基于ABAQUS平台,开发出抗震钢板剪力墙条带模型的用户单元子程序(称为UEL for SM)。为验证此子程序的有效性,使用ABAQUS和该...钢板剪力墙的条带模型(Strip Model,SM)不仅能准确地模拟出钢板的屈曲后行为,而且能明显地节省计算资源。因此,基于ABAQUS平台,开发出抗震钢板剪力墙条带模型的用户单元子程序(称为UEL for SM)。为验证此子程序的有效性,使用ABAQUS和该子程序对一个4层单跨钢板剪力墙的试验模型结构进行了建模与数值分析。在模型结构每层、每个方向设置10个条带,则每层总计20个条带。通过单调加载分析发现2%屈服后强化模量与初始弹性模量比能够更准确地模拟钢板的试验结果;进而进行循环加载的数值模拟。数值验证表明,在模型结构层间位移角小于1/40时,开发的用户单元子程序结果与试验结果吻合很好。展开更多
Within the framework of nonlinear eleetroelasticity, the stress field near to the crack tip in an infinite piezoelectric media subject to a far field uniform loading is studied by using an electrical strip saturation ...Within the framework of nonlinear eleetroelasticity, the stress field near to the crack tip in an infinite piezoelectric media subject to a far field uniform loading is studied by using an electrical strip saturation model and the complex variable method. And the emphasis is placed on the stress field near to the crack tip. The obtained solutions show that the normalized stress components at an arbitrary point near to the crack tip are determined by the angle of the point. Moreover, the stress components are independent of the distance from the point to the ori- gin of the coordinate. The distributions of in-plane stress components near to the crack tip are analyzed based on numerical results for PZT-SH. Compared with some related solutions, results show that the solutions are valid.展开更多
An optimization model is constructed to formulate the maximization problem on the capacity of V-belt drive. The concavity,the monotonicity and the global optimality condition are studied for the objective function,and...An optimization model is constructed to formulate the maximization problem on the capacity of V-belt drive. The concavity,the monotonicity and the global optimality condition are studied for the objective function,and it is proved that the feasible region of the model is bounded,closed and convex under some design conditions. Then,a solution method,called an optimal segment algorithm,is developed to find the global maximizer of the model. Under four different design conditions,solution methods are presented respectively. Some real case studies are employed to demonstrate that the model and the algorithm in this paper are promising.展开更多
An adaptive local smoothing method for nonpaxametric conditional quantile regression models is considered in this paper. Theoretical properties of the procedure are examined. The proposed method is fully adaptive in t...An adaptive local smoothing method for nonpaxametric conditional quantile regression models is considered in this paper. Theoretical properties of the procedure are examined. The proposed method is fully adaptive in the sense that no prior information about the structure of the model is assumed. The fully adaptive feature not only allows varying bandwidths to accommodate jumps or instantaneous slope changes, but also al- lows the algorithm to be spatially adaptive. Under general conditions, precise risk bounds for homogeneous and heterogeneous cases of the underlying conditional quantile curves are established. An automatic selection algo- rithm for locally adaptive bandwidths is also given, which is applicable to higher dimensional cases. Simulation studies and data analysis confirm that the proposed methodology works well.展开更多
文摘钢板剪力墙的条带模型(Strip Model,SM)不仅能准确地模拟出钢板的屈曲后行为,而且能明显地节省计算资源。因此,基于ABAQUS平台,开发出抗震钢板剪力墙条带模型的用户单元子程序(称为UEL for SM)。为验证此子程序的有效性,使用ABAQUS和该子程序对一个4层单跨钢板剪力墙的试验模型结构进行了建模与数值分析。在模型结构每层、每个方向设置10个条带,则每层总计20个条带。通过单调加载分析发现2%屈服后强化模量与初始弹性模量比能够更准确地模拟钢板的试验结果;进而进行循环加载的数值模拟。数值验证表明,在模型结构层间位移角小于1/40时,开发的用户单元子程序结果与试验结果吻合很好。
基金the Innovation Project for Graduates in Jiangsu Province~~
文摘Within the framework of nonlinear eleetroelasticity, the stress field near to the crack tip in an infinite piezoelectric media subject to a far field uniform loading is studied by using an electrical strip saturation model and the complex variable method. And the emphasis is placed on the stress field near to the crack tip. The obtained solutions show that the normalized stress components at an arbitrary point near to the crack tip are determined by the angle of the point. Moreover, the stress components are independent of the distance from the point to the ori- gin of the coordinate. The distributions of in-plane stress components near to the crack tip are analyzed based on numerical results for PZT-SH. Compared with some related solutions, results show that the solutions are valid.
基金supported by the National Natural Science Foundation of China (Grant Nos.71071162,70921001)the project for Excellent Talent of New Century,Ministry of Education of China (Grant No.NCET-07-0864)
文摘An optimization model is constructed to formulate the maximization problem on the capacity of V-belt drive. The concavity,the monotonicity and the global optimality condition are studied for the objective function,and it is proved that the feasible region of the model is bounded,closed and convex under some design conditions. Then,a solution method,called an optimal segment algorithm,is developed to find the global maximizer of the model. Under four different design conditions,solution methods are presented respectively. Some real case studies are employed to demonstrate that the model and the algorithm in this paper are promising.
基金supported by the major research projects of Philosophy and Social Science of the Chinese Ministry of Education(Grant No.15JZD015)National Natural Science Foundation of China(Grant No.11271368)+9 种基金the major program of Beijing Philosophy and Social Science Foundation of China(Grant No.15ZDA17)project of Ministry of Education supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China(Grant No.20130004110007)the Key Program of National Philosophy and Social Science Foundation Grant(Grant No.13AZD064)the major project of Humanities Social Science Foundation of Ministry of Education(Grant No.15JJD910001)Renmin University of China,the Special Developing and Guiding Fund for Building World-Class Universities(Disciplines)(Grant No.15XNL008)China Statistical Research Project(Grant No.2016LD03)the Fund of the Key Research Center of Humanities and Social Sciences in the general Colleges and Universities of Xinjiang Uygur Autonomous RegionGeneral Research Fund of Hong Kong Special Administrative Region Research Grants Council General Research Fund(Grant Nos.14300514 and 14325612)Hong Kong Special Administrative Region-Research Grants Council Collaborative Research Fund(Grant No.City U8/CRG/12G)the Theme-Based Research Scheme of Hong Kong Special Administrative Region-Research Grants Council Theme Based Scheme(Grant No.T32-101/15-R)
文摘An adaptive local smoothing method for nonpaxametric conditional quantile regression models is considered in this paper. Theoretical properties of the procedure are examined. The proposed method is fully adaptive in the sense that no prior information about the structure of the model is assumed. The fully adaptive feature not only allows varying bandwidths to accommodate jumps or instantaneous slope changes, but also al- lows the algorithm to be spatially adaptive. Under general conditions, precise risk bounds for homogeneous and heterogeneous cases of the underlying conditional quantile curves are established. An automatic selection algo- rithm for locally adaptive bandwidths is also given, which is applicable to higher dimensional cases. Simulation studies and data analysis confirm that the proposed methodology works well.
