Safety Assessment For Concrete Beam Bridge During Construction And Service Life

Due to the simple structure form and easy construction, concrete girder bridge was used a lot inlarge and medium-sized bridges in China. A lot of work have been done about the safety assessment forconcrete beam bridge at home and abroad, but less study exist for the safety assessment of the structuralelements of the construction period. Based on the practical engineering, this paper conducts safetyassessment for concrete beam bridge in construction and service life.Firstly, this paper studies safety assessment methods in the full life cycle of the domestic andinternational concrete girder bridge, indicators of investigation and analysis, to master the latest researchresults, and analyze the shortage of the achievements. Secondly, this paper analysis the working stage ofconcrete girder bridge, and put forward the security problems of the concrete beam bridge structure in thebridge construction process basing on the Chengde City, Hebei Province engineering. Third, evaluationmethods were compared, using the analytic hierarchy process for the construction period concrete beambridge the risk carried out for the qualitative evaluation ultimately. The main risks factors were filtered outthrough the assessment of beam bridge construction process risks at the macro level.Analysis the safety assessment of concrete beam bridge, the paper evaluates the possible risks andstudies the major risk factor for concrete beam bridge. In the end, through the analysis of the practicalcalculation method of structural reliability, the FOSM method was choose for the calculation of the typicalconcrete beam bridge. The paper calculates the degree of reliability of the typical concrete beam bridge atthe Construction Stage when the concrete beam born the loading of transporting girder vehicle, concretetank trucks. Through the comparison the safety of the main beam was evaluated.This paper research the security of the structural components of the beam bridge in the serviceabilitylimit state. After analysis, we decide to evaluate the deflection during normal use stage. At last, the papercalculate the reliable indicator of the deflection about the concrete girder bridges.Finally, this paper studies the reliability of the structural system, and introduces the concept ofthe structural system reliability, the influence factor and the method of calculation. After that, the law of thenarrow limits was used to calculate the corresponding beam bridge structure system.