A new family of explicit pseudodynamic algorithms is proposed for general pseudodynamic testing. One particular subfamily seems very promising for use in general pseudodynamic testing since the stability problem for a...A new family of explicit pseudodynamic algorithms is proposed for general pseudodynamic testing. One particular subfamily seems very promising for use in general pseudodynamic testing since the stability problem for a structure does not need to be considered. This is because this subfamily is unconditionally stable for any instantaneous stiffness softening system, linear elastic system and instantaneous stiffness hardening system that might occur in the pseudodynamic testing of a real structure. In addition, it also offers good accuracy when compared to a general second-order accurate method for both linear elastic and nonlinear systems.展开更多
If a traditional explicit numerical integration algorithm is used to solve motion equation in the finite element simulation of wave motion, the time-step used by numerical integration is the smallest time-step restric...If a traditional explicit numerical integration algorithm is used to solve motion equation in the finite element simulation of wave motion, the time-step used by numerical integration is the smallest time-step restricted by the stability criterion in computational region. However, the excessively small time-step is usually unnecessary for a large portion of computational region. In this paper, a varying time-step explicit numerical integration algorithm is introduced, and its basic idea is to use different time-step restricted by the stability criterion in different computational region. Finally, the feasibility of the algorithm and its effect on calculating precision are verified by numerical test.展开更多
大型复杂数值子结构的实时计算是实时混合试验的关键问题。针对这一问题,基于快速非线性分析法(FNA)的基本思想,提出了一种显式非线性振型叠加法(ENMS),能大幅提升数值子结构的求解效率。阐述了ENMS法的核心原理,针对桥梁-阻尼器后处理...大型复杂数值子结构的实时计算是实时混合试验的关键问题。针对这一问题,基于快速非线性分析法(FNA)的基本思想,提出了一种显式非线性振型叠加法(ENMS),能大幅提升数值子结构的求解效率。阐述了ENMS法的核心原理,针对桥梁-阻尼器后处理模型,设计了一个集虚拟作动器、时滞补偿器、数模转换器及滤波器等关键模块的硬实时混合仿真平台,并通过RTW(Real Time Workshop)实现实时运行,可确保仿真过程的实时性和结果的可靠性。通过采用所述仿真平台仿真,验证ENMS法在实时混合试验的适用性与计算效率。结果表明:考虑到数值模型简化、工控机噪声等因素,采用ENMS法的实时混合试验仿真结果准确,可用于大型复杂结构的动力学行为分析;进一步地,该方法能大幅提升数值子结构的求解效率,实现数值子结构实时求解。展开更多
阐述文献[1]的第二部分。第一部分在Ba ant Z.P.等人提出的混凝土微平面模型的基础上引入钢筋的影响提出了一个适用于配筋混凝土的微平面动态本构模型。混凝土模型采用能够反映各种复杂受力行为并被试验充分验证的微平面模型,钢筋采用Co...阐述文献[1]的第二部分。第一部分在Ba ant Z.P.等人提出的混凝土微平面模型的基础上引入钢筋的影响提出了一个适用于配筋混凝土的微平面动态本构模型。混凝土模型采用能够反映各种复杂受力行为并被试验充分验证的微平面模型,钢筋采用Cowper-Symonds型率相关的双线性模型。该模型可用于钢筋混凝土的静力和动力显式分析。这一部分将给出模型的显式算法和试验验证。展开更多
基金Science Council, Chinese Taipei Under Grant No. NSC-95-2221-E-027-099
文摘A new family of explicit pseudodynamic algorithms is proposed for general pseudodynamic testing. One particular subfamily seems very promising for use in general pseudodynamic testing since the stability problem for a structure does not need to be considered. This is because this subfamily is unconditionally stable for any instantaneous stiffness softening system, linear elastic system and instantaneous stiffness hardening system that might occur in the pseudodynamic testing of a real structure. In addition, it also offers good accuracy when compared to a general second-order accurate method for both linear elastic and nonlinear systems.
基金National Natural Science Foundation of China (50178065), 973 Program (2002CB412706), National Social Com-monweal Research Foundation (2002DIB30076) and Joint Seismological Science Foundation (101066).
文摘If a traditional explicit numerical integration algorithm is used to solve motion equation in the finite element simulation of wave motion, the time-step used by numerical integration is the smallest time-step restricted by the stability criterion in computational region. However, the excessively small time-step is usually unnecessary for a large portion of computational region. In this paper, a varying time-step explicit numerical integration algorithm is introduced, and its basic idea is to use different time-step restricted by the stability criterion in different computational region. Finally, the feasibility of the algorithm and its effect on calculating precision are verified by numerical test.
文摘大型复杂数值子结构的实时计算是实时混合试验的关键问题。针对这一问题,基于快速非线性分析法(FNA)的基本思想,提出了一种显式非线性振型叠加法(ENMS),能大幅提升数值子结构的求解效率。阐述了ENMS法的核心原理,针对桥梁-阻尼器后处理模型,设计了一个集虚拟作动器、时滞补偿器、数模转换器及滤波器等关键模块的硬实时混合仿真平台,并通过RTW(Real Time Workshop)实现实时运行,可确保仿真过程的实时性和结果的可靠性。通过采用所述仿真平台仿真,验证ENMS法在实时混合试验的适用性与计算效率。结果表明:考虑到数值模型简化、工控机噪声等因素,采用ENMS法的实时混合试验仿真结果准确,可用于大型复杂结构的动力学行为分析;进一步地,该方法能大幅提升数值子结构的求解效率,实现数值子结构实时求解。
文摘阐述文献[1]的第二部分。第一部分在Ba ant Z.P.等人提出的混凝土微平面模型的基础上引入钢筋的影响提出了一个适用于配筋混凝土的微平面动态本构模型。混凝土模型采用能够反映各种复杂受力行为并被试验充分验证的微平面模型,钢筋采用Cowper-Symonds型率相关的双线性模型。该模型可用于钢筋混凝土的静力和动力显式分析。这一部分将给出模型的显式算法和试验验证。
