Optimal Design of Concrete Tied Arch Bridge

In order to investigate the multi-parameter optimal design method of concrete tied arch bridges, an optimal model was established. In this model, rise, cross section dimensions of arch ribs and tied beams, area of each suspender and number of pre-stressed steel bars in each hole are selected as the design variables, code values as the constraint conditions, and total cost of whole bridge as the objective function. A plane analysis program for bridge structure, the software ANSYS and the mix-integer sequence quadratic program method were used together to program and solve the optimal model. The optimal model was solved by taking an arch bridge as engineering background, the optimal results were compared with the design values. The comparison results show that the concrete consumptions of tied beams and arch ribs is respectively reduced by 40.98% and 23.81%, the number of pre-stressed steel bars is decreased by 28.23%, and the total material cost is cut by 28.63%.