Virtual Simulation And Safety Assessment Of Long-span Continuous Rigid Frame Bridge Construction Technology Based On BIM Technology

In recent years,with the rapid development of China's economy and the vigorous promotion of infrastructure,bridge engineering,as an important branch of civil engineering,has been constantly improving its construction capacity.As a common structural system in the construction of long-span Bridges,prestressed continuous rigid frame bridge has attracted increasing attention and been widely used in the field of Bridges due to its unique advantages of low cost,smooth running and high durability.The construction method of prestressed continuous rigid frame bridge is mainly used by cantilever casting.During the construction process,there are many complicated procedures,poor construction conditions and frequent safety accidents.Therefore,ensuring the safe construction of the bridge and accurate control of the construction process are the key to improving the construction quality and efficiency of the bridge and ensuring the safety of the bridge structure in the operation stage.As BIM(Building Information Modeling)technology and the structure simulation analysis technology of mature gradually,in this paper,combined with specific engineering example,construction management guidance application of BIM technology,scientific management and standardize the implementation of bridge construction,and USES the finite element analysis software MIDAS/CIVIL simulation analysis was carried out on the whole process of bridge construction,to provide guidance for construction safety control,to ensure construction quality.The content of this thesis mainly includes the following parts:1.Summarize and study the application development and current situation of BIM technology in bridge engineering at home and abroad,discuss the structural system,construction method and construction control content of continuous rigid frame bridge,and introduce the general situation of bridge engineering studied in this paper2.This paper introduces the advantages and characteristics of BIM technology,determines the bridge modeling idea based on Revit platform and applies it to the long-span continuous rigid frame bridge.Based on the design drawings and construction schemes,and on the basis of drawing lessons from the modeling ideas of other professional bridge software,parametric modeling is carried out on the core member family library,temporary member family and construction site of the bridge,so as to establish the overall model of the bridge integrating design and construction.Based on BIM model,the application of the bridge is deepened,including field layout management,quantity statistics,collision inspection and construction simulation.3.Combined with previous experience,this paper established the finite element calculation model of long-span continuous rigid frame bridge based on BIM technology.MIDAS/CIVIL is used to study the cantilever construction control of long-span continuous rigid frame bridge.First,the structural force,stiffness and PSC parameters of the main beam are checked to ensure the reliability of the design scheme.The stress and deflection of bridge in key construction stage are analyzed in detail.The theoretical calculation values of the stress and deformation of the main beam structure during the cantilever construction of the bridge are determined,the stress changes of the key control section under each construction stage are analyzed emphatically,and the prearch degree of the bridge is calculated to determine the elevation of the initial die of the cantilever construction section.Finally,stress and elevation measuring points are arranged to form a monitoring scheme,which provides reference basis and effective data for the follow-up construction and monitoring of long-span continuous rigid frame bridge.