Research On Vibration Characters And Dynamic Behaviour Of Steel-concrete Curve Composite Beam

Along with the steel-conctete composite beams have been widely used in the railway construction due to its own advantages, the natural vibration characteristics and dynamic characteristics under moving load cause a lot of attention of scholars at home and abroad. This paper is based on national natural science foundation of china Research on bending-torsion coupling mechanism and diaphragm effect of curved composite bridges stiffened by diaphragm(51108281). Six steel-concrete composite beams have been designed with different plate number and span/radius of curvature ratios diaphragm. Hammer test and finite element model calculation were conducted to study experimental beams’ natural vibration characteristics. Finite element model of actual cruve composite beams was established to study its dynamic response and dynamic coefficient under moving load. The main works and conclusions of this paper are as follows:(1) Test beams’ self-vibration characteristic test. The natural vibration characteristics tests on 6 pieces of test beams under impact loading were measured. Vibration mode and natural frequency of vibration of test beams were got through data processing by DASP V10. Parameter analysis of test results was performed. The relationgship was concluded between the natural vibration frequency of composite beam and number of plate and span/radius of curvature ratios diaphragm.(2) Numerical simulation of test beams’ self-vibration characteristics. Finite element model of test beams were established by ANSYS. Vibration mode and natural frequency of vibration of test beams were got by finite element model calculating. Parameter analyses of the results were measured and compared and validated the calculation results with the test results.(3) Dynamic response analysis of cruve composite beams. Several curve composite beam models conformed to the requirements of the specification were founded. Dynamic responses of the cruve composite beams under moving load were got by model calculating through ANSYS. Analyse the calculated result, conclude the regulation of dynamic response influenced by vehicle speed, curve radius and slip.(4) Dynamic coefficient parameters analysis of cruve composite beams. Calculate the models of(3), conclude the the regulation of dynamic coefficient influenced by curve radius, slip and vehicle speed.