Study on Strengthening Method and its Effects on Main Arch Ring in Reinforced Concrete Arch Bridge
In order to find the best strengthening method for the main arch ring of reinforced concrete arch bridge to improve the strengthening effect,and to provide a reference for the strengthening of similar dilapidated arch bridges.Based on an actual strengthening example,the construction scheme corresponding to three strengthening methods is proposed,the finite element model was established by Midas civil,the influence of different strengthening methods is analyzed theoretically,and the initial stress level,internal force in the construction stage,stress in the bridge state,internal force and deflection of the original arch ring were analyzed.The maximum stress ratio,load displacement rate and deflection change rate of the strengthening layer were used to evaluate the strengthening effect.The results show:The maximum stress ratio of the scheme 3 is 45.12%and 52.74%larger than those of schemes 1 and 2 respectively.The load replacement rate of scheme 3 is the largest among the three schemes with the largest value being 3.82.Also,the deflection change rate of scheme 3 is the largest.Choose the way to strength the arch building with more spandrel structures,the better the strengthening effect.When the reinforced concrete arch bridge is strengthening,the construction strengthening scheme should be formulated based on the strengthening mode;At the same time,the construction plan should consider the construction period and strengthening cost.
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