大跨斜拉橋阻尼器參數(shù)分析及地震易損性分析
[Abstract]:Long-span cable-stayed bridge is an important non-regular bridge in traffic lifeline. In order to reduce its earthquake damage degree, in order to reduce the earthquake damage, it is often installed in the bridge with isolation device to prolong the structural cycle and dissipate seismic energy. The purpose of protecting bridges from damage. The seismic response of bridge structures under the action of ground motion of different strength exceeds the probability of a specified failure state. Seismic vulnerability curve is the most intuitionistic expression, and the relationship between damage and ground motion is a very important means of bridge risk assessment, so it is necessary to study the vulnerability of cable-stayed bridge with isolation device. In this paper, the damper parameters and seismic vulnerability of Cockdara Bridge are analyzed. The main content is as follows: 1. The finite element model of cable-stayed bridge is established to analyze the dynamic characteristics, and the basic period and mode of the bridge are obtained. A viscous damper is set up in the longitudinal bridge. The seismic response value of the structure is obtained by nonlinear time-history analysis. The mid-span displacement of the main beam, the shear force at the bottom of the tower, the bending moment and the damping force of the damper are extracted. The curved surface fitting is carried out by using matlab, and the equations of different response quantities are established. The optimal damping coefficient C and damping index 尉 are obtained by constructing the effect evaluation function, steel dampers are installed at auxiliary piers, transition piers and towers to extract the seismic response of key sections, and the data are standardized by means of the mean value method. The reasonable yield stiffness of steel dampers at different positions is obtained. Considering the uncertainty of the structure, the elastic modulus of steel bar, yield strength of steel bar and elastic modulus of concrete are selected as representatives. The Latin hypercube sampling (LHS) is used to generate the bridge structure samples and the random combination of the selected seismic waves to generate the "seismic wave-structure samples" set. The finite element model of different samples was established, and a series of small samples were formed by amplitude modulation of seismic waves. The nonlinear time history analysis of each small sample was carried out, and the seismic response value of key components was extracted. According to different components of cable-stayed bridge, different damage indexes are put forward, and the vulnerability curves of different parts of cable-stayed bridge are obtained by the method of capacity demand ratio. By comparing the damage probability of each section of the bridge tower, the most easily damaged section of the longitudinal bridge direction and the transverse bridge direction can be obtained. Finally, the seismic vulnerability curves of cable-stayed bridge system are established by using reliability theory.
【學位授予單位】:西安建筑科技大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:U442.55;U448.27
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