本文对两组五个钢筋混凝土核心筒试件进行了低周反复荷载试验，研究了不同轴压比和剪跨比的核心筒破坏机理、承载能力、延性和耗能能力等方面的抗震性能。结果表明，轴压比对核心筒的抗震性能有较大影响。

对近10年来在同济大学土木工程防灾国家重点实验室进行的建筑结构抗震研究进行了回顾和总结。研究工作主要包括高层建筑结构的抗震控制研究与应用、基础隔震研究、新型抗震耗能剪力墙的研究、结构-地基动力相互作用研究、方钢管混凝土结构研究、高层及超高层建筑结构抗震研究等。这些研究工作与工程实践紧密结合，大部分研究成果已在实际工程中成功应用。

A three-dimensional finite element analysis of the soil-pile-structure interation system is presented in this paper. The analysis is based on data from shaking table model tests made in the StaTE Key Laboratory for Disaster Re-duction in Civil Engineering. Tongji Universtiyt. China. The general finite element program ANSYS is used in the anal-ysis. The surface-to-surface contact element is taken into consideration for the nonlinearity state of the soil-pile interface. and an equivalent linear model is used for soil behavior. Acomparison of the results of the finite element analysis with the data from the shaking table tests is used to validate the computational model. Furthermore, the reli-analysis with the data from the shaking table tests is used to validate the computational model. Furthermore, the reli-ability of the test result is also verified by the simulation analysis. It shows that speration, closing, and sliding exist between the pile foundation and the soil. The distribution of the amplitude of strains in the pile, the amplitude of con-tact pressure, and the ampliude of sliding at the soil-pile interface are also discussed in detail in this paper.

A three-dimensional finite element analysis of the soil-pile-structure interation system is presented in this paper. The analysis is based on data from shaking table model tests made in the StaTE Key Laboratory for Disaster Re-duction in Civil Engineering. Tongji Universtiyt. China. The general finite element program ANSYS is used in the anal-ysis. The surface-to-surface contact element is taken into consideration for the nonlinearity state of the soil-pile interface. and an equivalent linear model is used for soil behavior. Acomparison of the results of the finite element analysis with the data from the shaking table tests is used to validate the computational model. Furthermore, the reli-analysis with the data from the shaking table tests is used to validate the computational model. Furthermore, the reli-ability of the test result is also verified by the simulation analysis. It shows that speration, closing, and sliding exist between the pile foundation and the soil. The distribution of the amplitude of strains in the pile, the amplitude of con-tact pressure, and the ampliude of sliding at the soil-pile interface are also discussed in detail in this paper.

Generally, the active structural control system belongs to the discrete time control system, and the sampling period is one of the most important factors that would directly affect the performance of tbe control system. In this paper, active control approaches by using the discrete-time variable structure control theory are studied for reducing the dynamic responses of seismically excited building structures. Based on the discrete reaching law method, a feedback controller which includes the sampling period is presented The controller is extended by introducing the saturated control method to avoid the adverse effect when the actuators are saturated due to unexpected extreme earthquakes. The simulation results are obtained for a single-degree-of-freedom (SDOF) system and a MDOF shear building equipped with active brace system (ABS) under seismic excitations. It is found that the discrete variable structure control approach and its saturated control method presented in this paper arc qu0e effective.