Experimental Study On The Force Performance Of Corrugated Steel-concrete Arch Bridges

Corrugated steel arch bridge is a traditional flexible structure with strong ability to adapt to deformation.Compared with the traditional concrete structure it has the advantages of low foundation strength requirement,fast construction,low cost,good durability and environmental protection of materials,etc.It has been widely used in China’s bridge projects.However,due to the thin thickness and light mass of corrugated steel plate,it is easy to be destabilized under constant load and live load.In order to improve its force performance and expand its use range,this paper proposes a new combined structure-corrugated steel-concrete arch bridge structure,by covering the corrugated steel plate with concrete to make it By covering the corrugated steel plate with concrete,the steel-concrete combined arch structure can give full play to the characteristics of good compressive strength of concrete and good tensile strength of corrugated steel plate to improve the strength and stiffness of the arch,thus enhancing the load-bearing capacity of the whole structure and improving the force performance of the structure.The main research contents of this paper are as follows.1.30 corrugated steel plate scaled models and corrugated steel-concrete structure scaled models were made according to the size of the corrugated steel-concrete arch bridge in the proposed corrugated steel-concrete bridge according to a similar ratio of 1:5,and the flexural performance tests were carried out to compare and analyse the strength and stiffness of the corrugated steel plate scaled models and the corrugated steel-concrete structure scaled models.The load carrying capacity,damage pattern,load-displacement and load-strain relationships of the corrugated steel plate scaled models and the corrugated steel-concrete scaled models were compared and analysed,and the feasibility of concrete reinforcement of the strength and stiffness of corrugated steel plates was determined.The methods for calculating the flexural load capacity and flexural stiffness of corrugated steel-concrete structures in the positive section are summarised.By calculating the ultimate bending moment of corrugated steel-concrete structures of different steel plate types,steel plate sizes,waveform sizes and concrete grades with the variation of concrete thickness,the method of optimizing the cross-sectional combination of corrugated steel-concrete structures is proposed.2.According to the method of optimising the cross-section of corrugated steel-concrete structures,a concrete arch of suitable thickness was selected for a new corrugated steel-concrete arch bridge,and a comprehensive stress test was carried out on the bridge,including static load tests during the construction process and in the finished state.A total of 20 test conditions were set up to analyse the displacement response,stress response and earth pressure response of the corrugated steel-concrete arch bridge structure and the ordinary corrugated steel arch bridge structure under different filling heights with or without concrete arch protection,different filling heights and different loading positions,and to study the influence of the filling load on the structural stress and internal force during construction.3.Numerical simulation and parametric analysis of corrugated steel-concrete arch bridges were carried out using the finite element software ABAQUS,and a simulation model of corrugated steel-concrete arch bridges was established.On this basis,the FEM analysis was carried out for corrugated steel-concrete arch bridges with different arch ring lines,thickness of steel plate,height of fill,thickness of deck slab and thickness of concrete arch guard.The influence of the design parameters on the force performance of corrugated steel-concrete arch bridges with different arch types is analysed,and reasonable engineering design suggestions are given to guide the design of such structures in the future.