Zhi Hong’s research while affiliated with Xiamen University and other places

In the former research, the Damper control system, TMD control system and the Mixed Control of the active control and passive control were all optimized alone. It is found that less research of the optimization is on the Mixed Control of the Damper system and TMD system. In order to achieve better control effect, we venture to propose a Mixed Control system of third-generation three-dimensional 20-storey Benchmark model under the multi-directional earthquake in this paper. By means of Rayleigh damping and D-value, dynamic equations including the damping matrixes, stiffness matrixes of the structure are obtained. Then in the process of the optimization, the displacement reducing coefficient (DRF) is used as the objective function to optimize the placement of damping devices and control parameters based on Genetic Algorithm (GA). Numerical results in this paper show that the optimal design method proposed in this paper is effective and flexible. It can obviously reduce the seismic responses of building structure.

In this paper, FWD(Falling Weight Deflectmeter) load stress distribution coefficient is used to calculate the modulus of pavement structure course as the initial value of modulus, the deflection value of the modulus of the derivative matrix is established. Based on the traditional iterative method, the initial value of the modulus being constantly modified to get modulus of pavement structure course, a new form of modified iterative method to identify the pavement elastic modulus is developed. It has been proved by practice that this method can converge to a solution quickly, accurately and stability. It may be an ideal tool to analyze measured deflection bowl data with FWD for highway manager department.

The different characteristics of pavement structure layer has been found that it can be directly reflected by FWD (falling weight deflectometer) deflection basin. However, the existing back-calculation method for the pavement modulus is regarded as complex, highly specialized approaches, hence, it is mainly used for the scientific research and design. In this paper, an approximate calculation model of pavement modulus is proposed for engineering by using Bousinesq formula which is based on elastic half-space theory, in addition, the measuring center displacement is checked by Odemark's consecutive three-layer system, the result shows that it is in accordance with the measured deflection. It means that the approximate calculation for the pavement modulus is simple and available, especially in the use of pavement evaluation.