Study on Mechanical Properties of Tunnel Concrete Filled Steel Tube Composite Structure
Steel arch frame,longitudinal connecting bar and shotcrete are often used in tunnel composite support system as some means of support.Based on Shantou Bay Subsea Tunnel in Guangdong,the influence of the strength of square steel tube concrete,the spacing between arch combinations,and the diameter of longitudinal connecting bars on the stress characteristics of the arch was studied through finite element numerical simulation software,and the load-displacement curves under different support schemes were analyzed.The research results show that:(1)the improvement of concrete strength significantly enhances the strength of the component in the elastic and cracking stages,especially in the elastic stage,where the strength enhancement is significant;(2)the reduction of the space between the arch combinations significantly enhances the strength of the elastic section and the cracking section of the members,and can effectively optimize the stress distribution;(3)with the increase of the diameter of the connecting bars,the yield load of the members increases slowly,and the bearing capacity of the members does not increase significantly.
composite supportconcrete strengtharch spacingsteel bar diametermechanical propertynumerical analysis
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维普
