Study On Safety Analysis And Control Of Space Beam-arch Combination Bridge

The cable force of the composite bridge is taken as the main line,and the stress analysis or safety control of the whole life cycle is the background.Based on the engineering as the space beam and arch combination bridge,the space cable surface of the beam and arch combination bridge,for the structural design stage of the reasonable bridge cable force and its influencing factors to do a detailed analysis;and structural stability,During the construction period of the construction period,the safety performance of the monitoring period and the life monitoring period of the health monitoring period are studied in depth,which provides important theoretical basis and engineering experience for the future construction of similar projects.The main contents of this paper:1.In view of the curved beam skew arch bridge,using a variety of methods to calculate the cable force,the results show that the arch bending energy method to determine the cable force is balanced,reasonable force and rib girder,higher economic effect;put forward comprehensive adjustment method based on multi factor matrix of cable,the principle is in the influence of matrix theory based on cable force difference minimization main objective function,with arch rib lateral displacement,force size,pull out as control function,the application number and the application of cable adjustment of adjusting cable force value,determine the adjustment sequence;finallythe causes of changes of cable forces,the damage effect of temperature,the bending torsional coupling effect and eccentric load effect are analyzed,for impacting cable force.2.In geometry,material and double nonlinear analysis of the stability of the curved beam skew arch bridge performance,study the effects of design parameters on the structure stability,e.g arch stiffness,beam stiffness,cable area,boundary conditions.the results show that arch rib transverse bending stiffness is the key factor in structural safety,existing an economic point of stability coefficient near extremum.And the effect on the stability of the girder stiffness and boundary conditions on the structure is very small.And analyzes emphatically the support reaction force and the internal force of the main girder in the process of reconstructing the construction,for the stability and durability of the structure.3.From under construction stage and operation stage introduces the space beam arch combination bridge safety control technology,makes the whole bridge structure stress in a step by step.Proposed method of Multifactor Synthesis Based on Influence Matrix,the validity is verified by adjusting the cable-stayed bridge during the operation period,and the final result is satisfactory;Finally compares the similarities and differences in different stage of the rope safety control,sensitivity analysis of the cable force adjustment,the trend of the cable control were summarized.4.The algorithm of Stochastic Subspace optimization is deduced to improve the efficiency of parameter recognition.The average regularization stability graph is proposed.Based on the principle of random subspace,the MAC criterion is used to reduce the data of the "past" output of the Hankel matrix,the projection matrix is avoided,the modal parameter identification is done by using the observable matrix to construct the sub-block matrix,and the engineering examples are analyzed and compared And the validity and validity of the optimization algorithm are verified.The stability graph contains the average regularized power spectrum,and the mutual verification is carried out to ensure the reliability of the recognition structure.The feasibility and effectiveness of the optimization algorithm are verified by three engineering examples.5.According to the characteristics of each load,the continuous acquisition of data is divided into small enough time period,the vehicle load effect is successfully built,and then the mathematical model is established to change the temperature load effect and the aging component from the total strain This paper introduces the health monitoring system of curved beam oblique arch bridge,establishes the evaluation method of dynamic strain waveform comparison and the causal analysis and evaluation model of long-term monitoring.Based on the example of truss arch bridge and curved beam oblique arch bridge,feasibility.