Simple Support Continuous Girder Bridge Seismic Design Concept Study

In recent years, frequent earthquakes, and bridges as one of the important lifeline engineering play a role in earthquake relief which is self-evident, therefore, the research of the simple supported-to-continuous girder bridge seismic performance has great realistic significance.However, in our country there is no specific provisions about the simple supported-to-continuous girder bridge seismic design theory, it is lack of appropriate reference data for design, and the seismic data are very scarce.This paper takes parrot Gou No.1 Bridge as the research background, and establishes the rational model of demand using the finite element analysis software to study its dynamic characteristics, This paper mainly do the following several parts:1 、 By reading a large number of bridge seismic information, it reviews and summarizes the static method, the dynamic response spectrum method and dynamic time history analysis method and random vibration theory, and nonlinear analysis method systematically.2 、 It studies the simple supported-to-continuous girder bridge self vibration characteristics combined with the engineering materials, including the difference between static effect and dynamic characteristics of the simply supported beam bridge, simple supported-to-continuous girder bridge and continuous girder bridge; It also studies the sensitivity coefficient which affects the dynamic characteristics of bridge structure.3、To simulate the full bridge model, and elastic time history analysis and summarize acceleration dynamic response, speed dynamic response, dynamic displacement response and the internal dynamic response displacement of the bridge structure in the three kinds of seismic wave.4、Quantitative analysis on the seismic performance of seismic isolation design of bridge, the support selection of the form as the research key, it carries on the contrast analysis between focusing on the bridge with lead rubber bearing design and the design of the bridge basin type rubber bearing。5 、 This paper makes a nonlinear analysis, and defines the constitutive relation of material model, considering effect of pile and soil,through the analysis of the fiber model method to analyze the bridge substructures, including the analysis of free vibration characteristics of simple supported-to-continuous girder bridge substructure separately; the structure curvature curve, inelastic hinging state and hysteresis curve.6 、 Based on the above research analysis summary, it obtains the expected conclusion, and makes a prospect.The study of the simple supported-to-continuous girder bridge seismic performance has great social significance and engineering application value for the design of reinforcement theory of perfect and effective seismic measures and post seismic bridge diseases.