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Abstract Research purposes:A three span tied arch bridge without wind bracing was studied. This bridge is wider than normal arch bridge. In order to reduce the deformation and stress of the crossbeam，three bearings were set through the direction across the bridge. Through that way，the stiffness of the structure is increased. The tie bar has a bigger torsion towards the bridge deck under the dead load and the live load. According to this，the tie bar has much bigger shear stress near the arch springing and it makes the stress of tie bar unreasonable. Research was made in this paper to find a solution to solve this problem.
Research conclusions:Results show that:(1)The construction order of the supports can affect the structural performance.(2)Install the middle supports after the suspenders finally stretched and the displacement of the cross beam tends to be stable which could release the stress of the tie bar. In that way，the shear stress of the tie bar caused by torsion and the principal tensile stress were efficiently decreased and finally it could meet the need of the standard. (3)This conclusion could be used for design，calculation and analysis of tied arch bridge without wind bracing.
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2015, Vol. 32 
