Construction Monitoring Simulation And Stability Analysis In Construction Stage Of Continuous Rigid Frame Bridge

Continuous rigid frame bridge is a girder bridge system which combines T rigidframe and continuous beam. It is widely used in bridge construction both at home andabroad as a result of its superior mechanical properties, good economic benefits andsmooth and comfortable driving conditions. Whether in construction stage or theoperational stage, its quality and safety should be given full protection, the structurelinear and stress state should meet the design requirements especially during thecantilever construction process which the bridge is in a state of statically determinatewithout any protection measures and the structure safety and stability are vulnerable to athreat. Therefore, construction monitoring for continuous rigid frame bridge is ofnecessity.This article regards Lamasi Ditch bridge as engineering background to study theconstruction monitoring of continuous rigid frame bridge, the main contents and therelated conclusion of this paper are as follows:①Studying the theory which relate to bridge construction control simulationanalysis by basing on the displacement finite element method. Giving the main contentof construction monitoring of Lamasi Ditch bridge and the calculation and analysismethods of bridge construction monitoring, establishing bridge construction monitoringsystem and expounding the influence factors of construction monitoring.②Building finite element model of the bridge by using bridge structural analysissoftware CSB and MIDAS/Civil to realize the simulated calculation of its wholeconstruction process. Analyzing and checking the results that are calculated by the twosoftware, combined with the existing engineering experience,we believe the LamasiDitch bridge’s simulation results about linear,internal force and stress are reliable andeffective.So they can be to used to control the actual construction.③Implying the site monitoring work for the bridge according to the establishedconstruction monitoring scheme, focusing on the key points on the control of geometriclinear and stress in actual construction process and analyzing the monitoring results. Inthe linear monitoring part, the elevation error of main girder is in the range of±9mmand the midline deviation is in the range of±8mm, making the closure which is of highprecision comes true eventually. In the stress monitoring part, the stress error is in therange of±1MPa,the result is reasonable and the utilized space of stress is enough. ④Expounding the necessity of the implementation of stability analysis inconstruction stage, calculating the critical load coefficient in different operatingconditions when pier NO.1stays in the separated and the largest cantilever stagecondition by using the buckling analysis module in MIDAS/Civil, then putting forwardto suggestions and measures to guarantee the safety and stability of the structure in theconstruction stage. The analysis result shows that the structure would keep stable indifferent load conditions and the bridge security and stability can be guaranteed.