Papers by Author: Quan Sheng Yan

Abstract: Choosing the Panzhong Bridge of the Guangzhongjiang highway as the research object, the dynamic behavior and seismic performance of cable-stayed bridge with different auxiliary pier positions were studied. The results show that the position of the auxiliary pier has limited influence on dynamic behavior. Under the action of the earthquake, auxiliary pier restricts the deformation of side span effectively and reduces the bending moment at bottom of the pile caps.

Abstract: According to the study on the practical Chaolianxijiang bridge, the stress state of cable-pylon anchorage zone of cable-stayed bridge under two kinds of prestressed arrangements (that is, U-shaped arrangement and parallel arrangement) were calculated and compared. The results suggested that parallel prestressed arrangement could avoid the difficulty caused by other arrangements in the construction. Parallel prestressed arrangement with clear concept, simple structure, clear stress and small amount of work is suitable for the thick walled cable-pylon.

Abstract: In order to overcome the disconnection and high cost and maintenance difficulties of the conventional data collection systems for structure monitoring of long span bridge, we developed a low-cost and effective data acquisition system composed of several wireless communication modules connected to vibrating wire type sensors. This system has the function to change conventional wire-based data collector into wireless one instantly. The prototype of wireless data acquisition system for vibrating sensors is described in this paper. Laboratory tests demonstrate that the wireless data acquisition system is of high accuracy and good stability. In addition, the application of this system to the strain monitoring of a large steel box arch shows the wireless data acquisition system with good performance improve the efficiency of data acquisition and reduces the cost of monitoring.

Abstract: This paper studies cable-damper mitigation model due to indirect excitation caused by bridge deck vibration. In the new mitigation model, as a rule of thumb, we considered a parallel association of idealize damper with a spring to simulate the inherent stiffness of the damper. The result shows that the interaction between the stiffness of the viscous damper could deeply impact the damper effectiveness, and the external damping should be increased deeply to provide the same non-dimensional modal damping when the inclined angle of cable decreases. The optimum damping coefficient of the non-idealized damper decreases when the stiffness of the damper increases.

Abstract: Analysis the dynamic response of the stay cable subject to parametric excitation represents a complex task for cable design procedure and forms an important step in the cable mitigation design. This paper analyses the characteristics of cable resonance under indirect excitation. The problem of cable vibration under the motion of the supports is considered as parametric excitation. The formulae for the estimation of maximum amplitude of cable vibration are presented to determine the resonance characteristics of large amplitude vibration of the cable under indirect excitation.

Abstract: Bridge jacking technology is a new technology in the field of old bridge reconstruction. Based on the case of Beijiang River Bridge jacking of Fokai highway extension engineering, the paper designs steel hoop as jacking force platform. By using ANSYS software, it makes finite element analysis and calculation as well as compares with the experimental data to check the reliability of models. In addition, the paper puts forward the optimization methods of steel hoop based on the analysis of the results. At last, it achieves the objective of saving materials and simplifying installation and use as well as provides guidance for the similar engineering.

Abstract: In this paper, the construction technology for main pylon of cable-stayed bridge is researched through test of full-scale model of anchorage zone of pylon of Guangzhou Bridge. Stress distribution and deformation condition of model under prestressed tendons and cable force are analyzed. Numerical simulation on this anchorage zone model is carried out. By comparing FEM results to the test results, some important conclusions are drawn out and give some advices to the optimum design of the bridge pylon. Parts of the achievements have been applied to actual bridge work and obtained successful engineering experience.

Abstract: Bridge jacking technique in the old bridge reconstruction project have broad application prospect, this paper is aim to share the bridge jacking technique and design the steel bracket as the load carrying platform. The finite element calculation is conducted by ANSYS software considering the concrete material nonlinearity with reasonable stress-strain relationship of concrete and element type. Compared with the experimental data, the model reliabilities and the results of two test programs are evaluated. We can conclude that the second structure form of this paper is safer, which can provide the meaningful guidance for similar projects.

Abstract: This paper studies cable-damper mitigation model due to indirect excitation caused by bridge deck excitation. In the new mitigation model, as a rule of thumb, we considered an attached spring associated in tandem with a damper to simulate the supporter flexibility. The result shows that the interaction between the flexibility of the support in the viscous damper could deeply impact the damper effectiveness, and the external damping should be increased deeply to provide the same non-dimensional modal damping when the inclined angle of cable decreases. The optimum damping coefficient of the non-idealized damper increases when the flexibility of the supporter increases.

Abstract: Modeling the dynamic response of the stay cable under bridge deck excitation represents a complex task for cable design procedure and forms an important step in the cable mitigation design. This paper analyses the characteristics of cable response under bridge deck excitation. The problem of cable vibration under the harmonic oscillation of the supports is considered as the external excitation. The formulae for the estimation of maximum amplitude of cable vibration are presented to determine the main cause of large amplitude vibration of the cable under indirect excitation.