摘要Modified predictor

Modified predictor–corrector numerical scheme for real‐time

pseudo dynamic tests using state‐space formulation

This paper deals with an explicit numerical integration method for real‐time pseudo dynamic tests. The proposed method, termed the MPC‐SSP method, is suited to use in real‐time pseudo dynamic tests as no iteration steps are involved in each step of computation. A procedure for implementing the proposed method in real‐time pseudo dynamic tests is described in the paper. A state‐space approach is employed in this study to formulate the equations of motion of the system, which is advantageous in real‐time pseudo dynamic testing of structures with active control devices since most structural control problems are formulated in state space. A stability and accuracy analysis of the proposed method was performed based on linear elastic systems. Owing to an extrapolation scheme employed to predict the system's future response, the MPC‐SSP method is conditionally stable. To demonstrate the effectiveness of the MPC‐SSP method, a series of numerical simulations were performed and the performance of the MPC‐SSP method was compared with other pseudo dynamic testing methods including Explicit Newmark, Central Difference, Operator Splitting, and OS‐SSP methods based on both linear and non‐linear single‐degree‐of‐freedom systems.

DEVELOPMENT OF SIMULATION SYSTEM FOR

DYNAMIC BEHAVIOR OF LIQUEFACTION GROUND AND BUILDING BY MEANS OF SUBSTRUCTURE PSEUDO

DYNAMIC TESTING

This paper describes development of a simulation system for dynamic behavior of liquefaction ground - building by means of substructure pseudo dynamic testing and its verification of accuracy. Soil-element loading test is adapted to the experimental sub-assemblage of the simulation. Soil specimen is made of drying sand. Dynamic system of the soil-building structure is replaced to the Penzien model. From the result of this simulation on the behavior of hysteric-curve, phenomena such as cyclic mobility, soft-spring and so on can be simulated by the soil-element loading test even under random cyclic loading. Dynamic behavior such as lengthening the natural period,

increasing the response displacement and decreasing the response acceleration can be simulated after occurrence of liquefaction.