Papers by Author: Jun Qing Liu

Abstract: In recent years, the phenomenon of vehicle overload in highway transportation is more and more serious. The three-dimensional dynamic FEM was adopted and a three-dimensional simulative model for asphalt pavement with subgrade based on cross-anisotropy under moving load was established by the large-scale finite element analysis software ABAQUS. The response of the stress in the pavement structure was got by using ABAQUS/Standard code. During deceleration, The simulation analysis results under the rated load were compared with those under the different overload ratio. The results show that, under moving load, the surface course of pavement is mainly in three dimension compressive stress state. The horizontal load caused by deceleration has a remarkable effect on the longitudinal stress and the horizontal shearing stress. The stress of the pavement structure under overload is much greater than that caused by the rated load. And the greater the overload ratio, the greater the deviation between them.

Abstract: The Taizang tower was the research object in this paper. The field of stress and displacement before and after reinforcement were calculated under seismic load. The dynamic response and variation regularity were obtained using dynamic finite element method (FEM). The results show that: Taking reinforcement measures, maximum displacement can obviously decrease and the distribution of stress tends to be uniformity. Reinforcement measures can improve the stability of the soil site.

Abstract: It established Multi-Support excitations time history analysis model Based on large quality method. It took large span reticulated shell for example, chose EL-centro wave to carry on the spectrum analysis and time history analysis with direct integral method, studied the deformation capacity and destruction features of structure under rare earthquake of magnitude of 8, and put forward the seismic performance’s related measures and suggestions in elasto-plastic analysis of the large span reticulated shell under multi-support excitations for the actual engineering reference in design.

Abstract: This paper analyzed the board of reliability on the elastic half space model. Considered the random of the larger variability parameters, such as foundation, board, load, the paper studied the reliability of this issue application of the response surface method of quadratic polynomials. This paper analyzed the influence of the random parameter variability on the reliability index β and failure probability, obtained some useful conclusions and had some engineering referencing.

Abstract: This paper analyzed the board of reliability on the elastic half space model. Considered the random of the larger variability parameters, such as foundation, board, load, the paper studied the reliability of this issue application of first order second moment method. This paper analyzed the influence of the random parameter variability on the reliability index β and failure probability, obtained some useful conclusions and had some engineering referencing.

Abstract: To provide guidance to engineering practice, the reliability of the vertical bearing capacity of single steel pipe pile is analyzed. The FOSM method, the FOSM method based on fuzzy stochastic and the FOSM method based on artificial neural network are used to calculate the reliability of steel pipe pile through MATLAB program. It is show that the FOSM method based on fuzzy stochastic and the FOSM method based on artificial neural network are more suitable for the reliability analysis.