Earthquake Nonlinear Collisions Analysis Of The Hollow Slab Simply Support Beam Bridge

With China's transportation infrastructure construction, as a hub of aseismatic take precautions against natural calamities bridge structure is paid attention to problems in earthquake, as is known to all, under the bridge structure, across-chain adjacent beam may collide disasters, collision will produce the huge impact, can cause damage to the different degree and girder sometimes caused fall beam serious consequences. In order to reduce or avoid seismic action.based bridge across the room, should choose the collision force is consistent with the reality of collision with the calculation model for simulation unit, through the analysis to find a collision conditions, influence factors and collision of bridge seismic performance etc. Based on the establishment of bridge structure dynamic analysis model of beam element by using nonlinear contact Kelvin unit, the collision of bridge structure model of non-linear seismic response analysis of longitudinal collision. Using Visual Fortran programming, choose suitable for different site conditions and different seismic amplitude peaks of the bridge and also considering constraints and adjacent spans than change etc, were calculated and analyzed the beijing-zhuhai expressway bridge structure and seismic response of the collision of longitudinal launching bridge seismic response analysis of longitudinal collision of necessity. The specific content of work done:(1)First to space beam element BSE, established considering spatial beam slab structure of thin-walled beam element dynamic analysis model, this model considering the bridge structure of bending-torsional coupling vibration, lateral restraint torsion deflection, piers and deformation of nonlinear dynamic response of structure, etc. Using energy principle is given, the quality of bridge stiffness matrix of matrix and the damping matrix.(2)Piers choice space beam element, bearings, adopting "choose non-linear bearings accordingly" generation bridge structure stiffness matrix and overall quality of matrix and the damping matrix, the structure by using modal frequency calculation program, combined with engineering example calculated under the condition of bridge structure more natural frequencies and modal changes.(3)Choose nonlinear contact Kelvin unit based on the nonlinear model, and the collision model analysis, Wen unit bearing input and four field earthquake affected by peak amplitude, the corresponding Fortran programming computing the Visual beijing-zhuhai expressway bridge structure in many cases of longitudinal collision nonlinear responses, and the results of calculation is analyzed and compared, the results can be used bridge seismic design reference. Because the space is based beam element modeling and programming, this program structure with overall freedom and computing speed and high precision characteristics, especially suitable for the large-scale structure of the response analysis and calculation, the practical example, the program has strong commonality and implanting.