Large Span Concrete Filled Steel Tubular Frame Tied Arch Bridge Optimization

At present, there has been many researchs about the arch rib linear and optimization design of cross-section size on CFST Arch Bridge both at home and abroad.But most of them concentrate in the optimization of the arch linear lacking of consideration on it and the cross-section size. Literature[1] has a detailed work on it,but the elastic modulus of concrete was discounted by 0.85 times to simply replace when considering the affect of creep and shrinkage of concrete.But it has greater error with actual structure's internal force redistribution of creep and need further improvement.Based on Literature[1],this paper carrys out the ANSYS-based concrete creep force analysis making the optimization model more precise and complete.Besides,single parameter sensitivity analysis has been done on each design parameter with this optimization program.The main work are as follows:(1) Based on APDL of ANSYS Secondary development, the author establishs the process of concrete-filled steel tube's creep analysis,and verifies it's correctness by example.(2) Establish more sophisticated optimization model on CFST arch bridge.(3) Conduct the optimization research on a CFST rigid frame tied arch bridge.(4) Single parameter sensitivity analysis has been done on each design parameter.(5)Realize automation design of arch axis linear through parametric modeling.(6)Obtain satisfactory results by checking the optimization results with Midas/civil software.We obtain design variables playing a leading role in the total coat through sensitivity analysis, providing a reference for further study on optimization design.It provides that the content and conclusions of this paper have value on the engineering design.