Experimental Research On Shear Behavior For RC Beams With Damages Caused By Marine Environment At High Temperature

In the long period of use,the temperature of marine coastal concrete structures is not high when in normal working condition;the design can guarantee the safety of the structure and function in accordance with the specification requirements.But when the environmental temperature raises a lot,the structure may failure because of the use of performance deterioration or decline in capacity,so it is necessary to study the marine environment of high temperature performance of reinforced concrete structures.In order to study the fire performance of RC beams damaged by marine environment and determine the influence of different erosion damage on the temperature field distribution and the bearing capacity of the beam section,4 RC beams samples were designed,3 of them were carried out electrochemical corrosion tests to simulate the different width as the initial conditions of fire resistance test,the main research work are as follows:(1)The research status of fire-resistance of domestic and foreign engineering structure and the durability of marine concrete structure were analyzed,summarized the impact of chloride ion erosion on the mechanical properties of steel and the high-temperature behavior of steel and concrete systematically;(2)Some RC beams samples were designed to stimulate the marine environment damage caused by chloride ion erosion test according to Faraday's law;(3)The fire test were carried out to analysis the influence of different cracks width on temperature field of the beam by researching the section temperature distribution;(4)All the members were load after fire test in order to obtain the residual bearing capacity;(5)The influence of bearing capacity degeneration of the damaged beams was analyzed by comparing the loading date.