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Long-span bridges as a transportation hub for online engineering and lifeline projects, long-span bridges with soft structure, earthquake dynamic response. As a form of energy consumption shock absorber fluid damper, very early in the aerospace, mechanical, military and other fields. According to the fluid motion, especially when made of fluid through the orifice when the viscous resistance of the principle, stiffness, speed dampers. Fluid damper has a wide range of security, economic, applicable, low maintenance costs, has been widely used in engineering practice. This paper studies the fluid damper passive control of longitudinal seismic effect on the Bridge. By the introduction of the fluid damper energy consumption principle, this principle is applied to the Wuhan Tianxingzhou Bridge, through the creation of three-dimensional finite element model of Tianxingzhou Bridge, its dynamic characteristics analysis, using the 200gal EI centro seismic waves Tianxingzhou Bridge the main beam longitudinal dynamic response analysis. Tianxingzhou Bridge dynamic response control, fluid damper by conbim14 unit imitate meet the safety and durability of Tianxingzhou Bridge during service. This article describes the the the fluid damper classification and working principle and structure are given a variety of fluid dampers; internal structure to study the performance of the fluid damper damper (sealing of the orifice and the area of ??the piston rod). In addition, the excitation frequency, the relative velocity, outside temperature and the viscous medium, and other factors can also affect the performance of the fluid damper. Viscous dielectric fluid damper play a decisive role; fluid damper is widely used, its installation project in the form: diagonal bracing, chevron support, lasso-type support, scissors support several species. This paper analyzes the fluid damper to medium viscous fluid type - Newtonian fluid and non-Newtonian fluids and their classification; introduce fluid dampers used several restoring force model: linear model, Kelvin model, Maxwell model and Wiechert model. In this paper, ANSYS finite element software to establish the three-dimensional model of Tianxingzhou Bridge and the first of its modal analysis and extraction on 10 modal Tianxingzhou Bridge basic modes for the first-order modes; followed by transient structural analysis, by the results of the Bridge longitudinal displacement is too large, far exceeding the design requirements, hence the need for structural vibration control, using ANSYS software simulation of the fluid damper added again Tianxingzhou Bridge model structural transient analysis, the results show that, the fluid damper greatly reduced of Tianxingzhou Bridge longitudinal displacement in the earthquake.
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