Design And Application Of Post-evaluation System For Construction Monitoring Of Continuous Rigid Frame Bridge

In the process of construction monitoring of continuous rigid frame bridge,post-evaluation of construction monitoring can more accurately and intuitively analyze the construction monitoring effect of each section,and show the results to many parties.From the evaluation results,we can analyze the shortcomings of the structure,and reflect the advantages and disadvantages of the construction monitoring method from the side.Based on the measured data of Lowe Bridge with a main span of 125 m,this paper mainly studies the following aspects:(1)Statistical analysis of the research status of continuous rigid frame bridge construction monitoring and post-evaluation in recent years shows that only part of the bridge evaluation system involves this part of the content,of which the definition of post-evaluation of bridge construction monitoring is not unified in the industry,and the research on post-evaluation of monitoring in the construction process is less.In view of the above phenomena,according to the implementation stage of post-monitoring evaluation and the use of evaluation results,this paper gives a more detailed definition of post-monitoring evaluation in a broad sense.(2)Because the construction monitoring of continuous rigid frame bridge is a long-term and continuous process,there are many influencing factors.Based on the existing post-monitoring evaluation indexes of bridge construction,combined with the monitoring theory and the experience of supervisors in this field,a set of reasonable and comprehensive post-monitoring evaluation indexes are selected from the stage of cap construction,pier construction,0# block construction,main beam cantilever casting,side span cast-in-situ,closure and second stage pavement construction respectively,and a new set of evaluation indexes is put forward.It is suitable for the post-evaluation system of construction monitoring of continuous rigid frame bridge.(3)According to the analysis of several commonly used index weight determination methods and index score calculation methods.This paper finds that the uncertain analytic hierarchy process can reflect the expert's opinions reasonably and comprehensively,it can also reflect the uncertainty and fuzziness between the evaluation indexes,and the operation is relatively simple.(4)For different evaluation indicators,their scoring methods should be different.In this paper,a specific scoring formula based on grey relational degree is proposed fordifferent indicators,the feasibility and validity of the formula are verified by the analysis of field monitoring data of Lowe Bridge.Due to the unavoidable error of manual measurement and instrumentation during field monitoring,this paper,based on the experience of monitoring personnel and consulting relevant experts in this field,finally determines the evaluation threshold of different indicators.(5)The whole post-construction monitoring evaluation system of continuous rigid frame bridge is applied to Lowe Bridge,and the integrity and feasibility of the evaluation system have been verified by practical engineering analysis.