Study On Bearing Capacity Evaluation And Reinforcement Measures Of Simply Supported Beam Bridge For Mutirank Utmost Vehicles

With the development of the indusrial construction in our country,more and more utimost load vehicles run on the bridges.Most of them are beam bridges at the present stage. It is very necessary to evaluate the bridge bearing capacity and strengthen the bridges, which worked under multirank utimost load vehicles.The research results have remarkable economic benefits.The principles and procedures of the safety evaluation for bearing capacity of the bridges are determined by analysis.This paper gives analysis and summary to current method for bridge bearing capacity evaluation,applies for the method of design theory.For the evaluation of exiting bridges for heavy truck or overloading,fuzzy mathmmatics theorem is used to evaluate the conditions of the bridges quality.The paper also puts forward the fuzzy comprehensive evaluation method for checking parameters Z₁ of carry capacity of exiting bridges,and the method is tested by an example.The paper chooses two types of beam bridge as the researching objects.The first type is simply supported beam bridge with span in the range of 6～20m,and the second type is multi-span continuous beam bridge whose spans respectively are 8m, 10m, 13m andl6m.In this paper the loading and resistant force effect values of the researching objects respectively acting by five representative vehicles are calculated and bearing capacity assessment is determined.By comparing and analysing mass calculating data,the feasibility for heavy truck passing the bridges is determined.This paper evaluates the passing fessibility of utmost load vehicle for simply supported beam bridge by equivalent-load method,and compares the results of the analysis and design theory method ,then analysis the difference.According to the damage mechanism of bridge structure acted by utmost load vehicles,the reinforcement measures are discussed,and each measure is compared,which make abundant preparation for the safty guarantee of bridges for heavy trucks and overloading.Finally,with the example of Maoming Petrochemical Company,this paper evaluates the bearing capacity of nahua and xiaodongjiang bridge respectively,then make reasonable reinforcement messures.