Research About Evaluation Index Of The Concrete T-Beam Bridge's Technical Condition

In China,most of the current technical conditions of bridge inspection and evaluation indicators are static,and the bridge inspection process required under the control of traffic load conditions.So,the current test results cannot fully reflect the technical condition of bridges under prevailing traffic loading conditions.This paper presents the modal analysis and dynamic deflection and other indicators under the stochastic traffic loading conditions,to evaluate the technical condition of the bridge,and improve the technical condition of the existing bridge evaluation methods.The main contents of this paper are as follows:(1)In the basic of analysis the existing norms bridge technical condition evaluation content and evaluation methods,this paper review the characteristics of the technical condition of the existing bridge evaluation methods,point out the limitations of the prior art bridge condition evaluation is proposed to explore new the necessity and urgency of the dynamic characteristics index.(2)According to relevance bridge modal analysis to demonstrate bridge modal parameters and bridge health.Establish a relationship between bridge structure parameters and modal analysis of non-parametric model(frequency response function).Provide a theoretical basis for the reaction of the bridge modal parameters physical parameters indicators of the bridge structure.(3)Introducing bridge dynamic analysis of ways to build bridges vibration frequency numerical analysis model to study the bridge vibration frequency and extent of damage at different locations under response of injury.Establish ANSYS transient analysis model,and determine the moving mass dynamic transient analysis model for the bridge deflection curve analysis model.With this model,maximum static deflection index,the maximum dynamic deflection indicators and dynamic deflection curve index numerical errors in response to varying degrees of damage.(4)With the background of Beijing LANGFA East Bridge engineering,measured by the bridge structure and modal vibration response,Analysis mode shapes and modal frequency index,static deflection index,deflection influence lines indicators,impact indicators and dynamic coefficients deflection curve index evaluation T-beam bridge technology feasibility Assessment.