The Study On Design Method Of Durability Design For Adhesive Steel Plate Reinforcement Of Concrete Bridge In Muggy Environment

At present,the research on the concrete bridge reinforced with steel plate is mainly focused on the failure mode and the relevant theoretical value in the limit state.The durability of the reinforced concrete bridge under the action of the environment is relatively small.Some people think that the use of adhesive steel plate reinforced concrete structure,as long as the effective measures(glue,bolts)to ensure that the steel plate and concrete deformation synchronization,in a very long period of time the structure of the bearing capacity can be guaranteed.In the actual reinforcement project,the use of bonded steel plate to strengthen the structure is reinforced,the environment between the steel plate and the concrete layer between the role of greater deterioration,and long-term load,the adhesive layer and concrete/steel is also prone to fatigue Cracking,resulting in reduced bonding or even failure.Therefore,it is necessary to study the degradation law of the adhesive layer under the environment or environment/load coupling,and the influence of the decrease of the bond stiffness on the synergistic effect of the steel plate/concrete.Through the muggy environment,the steel structure reinforced concrete structure test was carried out,and the constitutive relation of the interface sliding plate was studied.The τ-s constitutive relation of the interface is defined by a single linear τ-s model,and a single linear constitutive model expression is proposed.At the same time,the interface bond stiffness and temperature and the relationship between the expression of humidity.The adhesion a value of different temperature and humidity environment is analyzed,and the degree of thermal and thermal environment is divided according to the influence degree of temperature and humidity on the bonding stiffness.Suggestions on the performance of steel plate,structural adhesive and protective material under different environmental action grades.The external factors such as time variation of steel strength,time difference of concrete strength,time difference of concrete strength,And the law of decay of concrete strength,the law of attenuation of steel strength,the decay of bonding ability caused by steel corrosion and the law of adhesion stiffness of steel plate-concrete interface are introduced.According to the calculation formula of the flexural capacity of the positive section of the steel plate,the calculation model of the durability resistance of the steel plate with different compression zone height and the expression of the resistance calculation are put forward,the mean value and the difference expression is used to calculate the reliability index β.Based on the reinforcement durability of the paste steel plate construction details and measures to prevent drainage.The construction is mainly on the weld requirements,by reducing the resistance caused by the weld attenuation to improve durability.This paper mainly introduces the form of butt welds,the structure of the welds and the shape of the external steel plates,and gives the suggestions on the use of the relevant structures.According to the requirements of the design method of the durability of the steel plate and the design of the durability of the reinforcement structure in the muggy environment,the three stages of construction preparation,construction process,inspection and acceptance are put forward to improve the durability Suggest.