Parameter identification of Pasternak foundation models(PFM)is never satisfactory,which discourages the application and popularization of PFM.In the present study,an energy-based model to predict the dynamic foundatio...Parameter identification of Pasternak foundation models(PFM)is never satisfactory,which discourages the application and popularization of PFM.In the present study,an energy-based model to predict the dynamic foundation coefficients was proposed using the vibration kinetic energy and potential energy of a Pasternak foundation-rigid plate system.On the basis of the Pasternak foundation,the relationship among the natural frequency,dynamic foundation coefficients,rigid plate configuration,and vibrating soil equivalent mass per unit area was considered.To obtain the natural frequencies of the Pasternak foundation-rigid plate system,dynamic tests were performed.Using two or more dynamic test results of various rigid plates on a foundation,a set of equations of dynamic foundation coefficients was set up to directly identify the foundation coefficients and equivalent mass per unit area of vibrating soil.The feasibility of the proposed method was verified by comparing it with the outdoor and indoor test results and finite element analysis results.When the proposed method is used to obtain the dynamic parameters,PFM can be generalized and applied more widely in engineering practice.展开更多
A semi-analytical and semi-numerical method is proposed for the dynamic analysis of foundations. The Lamb＇s solution and the approximate formulae were used to establish the relation of the contact force and deflectio...A semi-analytical and semi-numerical method is proposed for the dynamic analysis of foundations. The Lamb＇s solution and the approximate formulae were used to establish the relation of the contact force and deflection between the foundation and soil. Therefore, the foundation can be separated from soil and analyzed by FEM as for the static cases. The plate can be treated as that the known forces are acting on the upper surface, and the contact pressure from soil can be represented as the deflection. So that only the plate needs to be divided into elements in the analysis. By this method, a series of vibration problems, including various shapes and rigidities of foundations, different excitation frequencies, were analyzed. Furthermore, it can be used for the embedded foundation. The numerical examples show that this method has simplicity, highly accurate and versatile. It is an effective method for the dynamic analysis of foundations.展开更多
There are at least three foundational relationships between the three conscious acts of intellect,emotion,and willing.Section 2 covers the structural foundational relationship(Brentano and Husserl in his early period)...There are at least three foundational relationships between the three conscious acts of intellect,emotion,and willing.Section 2 covers the structural foundational relationship(Brentano and Husserl in his early period):all conscious acts are intentional and can be divided into objectifying(intuition and representation)and non・objectifying acts(emotion and willing).Because a non-objectifying act cannot constitute an object,things must be based on objectifying acts and the object constituted by the latter;in this sense,a non-objectifying act is rooted in an objectifying one.Section 3 explains the genetic foundational issue with consciousness(Husserl in his later period,Scheier,and Heidegger):the stream of consciousness has its earliest origins and follows a process where it gradually unfolds.The earliest origin is the intentional willing,followed by nonintentional feelings,and,finally,the representation and thinking of willing.Intentional activity taking place afterward must be based on the conscious activity that has come already.Section 4 points out that,apart from the two aforementioned kinds of foundational relationships(i.e.structural and genetic),a third foundational relationship(i.e.dynamic)can also be found between the conscious acts of intellect,emotion,and willing in the Consciousness-only school(a Buddhist tradition in the East).In a continuous activity,the foundational relationship between the three aspects of intellect,emotion,and willing always remains encased in dynamic changes,and the change of primary and secondary roles(i.e.a change in the foundational relationship)could happen at any time.From this perspective,one can explain and resolve the confrontation and conflicts between the two former foundational relationships.展开更多
文摘Parameter identification of Pasternak foundation models(PFM)is never satisfactory,which discourages the application and popularization of PFM.In the present study,an energy-based model to predict the dynamic foundation coefficients was proposed using the vibration kinetic energy and potential energy of a Pasternak foundation-rigid plate system.On the basis of the Pasternak foundation,the relationship among the natural frequency,dynamic foundation coefficients,rigid plate configuration,and vibrating soil equivalent mass per unit area was considered.To obtain the natural frequencies of the Pasternak foundation-rigid plate system,dynamic tests were performed.Using two or more dynamic test results of various rigid plates on a foundation,a set of equations of dynamic foundation coefficients was set up to directly identify the foundation coefficients and equivalent mass per unit area of vibrating soil.The feasibility of the proposed method was verified by comparing it with the outdoor and indoor test results and finite element analysis results.When the proposed method is used to obtain the dynamic parameters,PFM can be generalized and applied more widely in engineering practice.
文摘A semi-analytical and semi-numerical method is proposed for the dynamic analysis of foundations. The Lamb＇s solution and the approximate formulae were used to establish the relation of the contact force and deflection between the foundation and soil. Therefore, the foundation can be separated from soil and analyzed by FEM as for the static cases. The plate can be treated as that the known forces are acting on the upper surface, and the contact pressure from soil can be represented as the deflection. So that only the plate needs to be divided into elements in the analysis. By this method, a series of vibration problems, including various shapes and rigidities of foundations, different excitation frequencies, were analyzed. Furthermore, it can be used for the embedded foundation. The numerical examples show that this method has simplicity, highly accurate and versatile. It is an effective method for the dynamic analysis of foundations.
文摘There are at least three foundational relationships between the three conscious acts of intellect,emotion,and willing.Section 2 covers the structural foundational relationship(Brentano and Husserl in his early period):all conscious acts are intentional and can be divided into objectifying(intuition and representation)and non・objectifying acts(emotion and willing).Because a non-objectifying act cannot constitute an object,things must be based on objectifying acts and the object constituted by the latter;in this sense,a non-objectifying act is rooted in an objectifying one.Section 3 explains the genetic foundational issue with consciousness(Husserl in his later period,Scheier,and Heidegger):the stream of consciousness has its earliest origins and follows a process where it gradually unfolds.The earliest origin is the intentional willing,followed by nonintentional feelings,and,finally,the representation and thinking of willing.Intentional activity taking place afterward must be based on the conscious activity that has come already.Section 4 points out that,apart from the two aforementioned kinds of foundational relationships(i.e.structural and genetic),a third foundational relationship(i.e.dynamic)can also be found between the conscious acts of intellect,emotion,and willing in the Consciousness-only school(a Buddhist tradition in the East).In a continuous activity,the foundational relationship between the three aspects of intellect,emotion,and willing always remains encased in dynamic changes,and the change of primary and secondary roles(i.e.a change in the foundational relationship)could happen at any time.From this perspective,one can explain and resolve the confrontation and conflicts between the two former foundational relationships.
