Study On Maximum Fill Height Of Small And Medium-span Corrugated Steel Arch Bridge

With the rapid development of China’s economy,bridges play an important role in traffic engineering.Traditional masonry structure and reinforced concrete structure bridge are prone to many defects in the application process,such as higher foundation bearing capacity,longer construction period,bridge approach jump and structural damage caused by differential settlement.Corrugated steel arch bridge is a new type of structure,which has many advantages,such as light weight,simple construction,short construction period and strong foundation deformation adaptability.In recent years,small and medium span corrugated steel arch bridges have gradually begun to be widely used.On the basis of consulting the relevant literature and according to the actual situation of the project,a detailed field test scheme is formulated.The field measured data are collected and analyzed.The finite element method is used to simulate the corrugated steel arch bridge under different working conditions.The simulation and field measured data are compared and analyzed.The final results show the feasibility of the finite element simulation method.The finite element model of corrugated steel with different filling height,waveform parameters,span and thickness was established,and the maximum filling height of the model was found.Through this study,the following conclusions can be drawn:(1)When the center line of the test vehicle’s mid-rear axle coincides with the center line of the arch bridge,it is the most disadvantageous position for the vehicle load,so the influence of the vehicle load on this position should be considered in the design and observation;(2)With the vehicle load,the maximum displacement change is at 900 regardless of the peak and trough,and the maximum values of the variation of stresses appear at 0° or 30° section,which can be taken as the key analysis objects;(3)With the vehicle load,the stress trends of section 1,section 2,crest and trough are obviously different,and the changes of wave shape,thickness and span have a greater impact on the trough,while the changes of filling height have a greater impact on wave crest;(4)Reasonable finite element model can be obtained by finite element simulation,which is consistent with the actual project,finite element simulation can be used as one of the main ways to analyze the mechanical properties of small and medium-span corrugated steel arch bridges;(5)The height of filling is obviously affected by waveform,span and thickness.The maximum filling height of arch bridges under different working conditions can be determined by simulation.The filling height under sufficient conditions can be selected according to local actual conditions in actual using;(6)The mechanical properties of corrugated steel plates with wave parameters of 380 mm×140 mm x76mm and 400 mm×150 mm×81 mm are comparatively close.In engineering practice,the appropriate waveform range can be selected according to the specifications,the budget and local conditions;(7)When the waveform,thickness and fill height are the same,the absolute values of tangential stress and equivalent stress increase with the increase of span;when the waveform,span and fill height are the same,the absolute values of tangential stress and equivalent stress decrease with the increase of thickness;when the waveform,thickness and span are the same,in a certain range,with the increase of fill height,the absolute values of tangential stress and equivalent stress increase.